Milos Gojic

Randy Tong wrote:Which tutorial you are referring ?

Udacity android data storage

Udacity data storage

Randy Tong wrote:No, you don't have getApplication() in front.

Sry,you are right but i added this and the same problem persist. Maybe problem is in my provider class,but can't rememer changing anyhing in it.
thanks for effort

Randy Tong wrote:Try this
newUri = getApplication().getContentResolver().insert(                PetContract.Pets.CONTENT_URI,                contentValues

I already have this lines of code on line 61

Hello i am following Udacity android data storage course.But just hit the wall. We are making pets app in witch user can add,update and delete a pet. In one segment we had to use floating button,and with intent go to another activity, from Catalog Activity to Edit ACtivity. But when i click on floating buton got an error:An error occurred while executing doInBackground() .I do not use AsyncTask doInBackground() method,but understand that my Loader using a AsyncTask class.I also fnd that problem might be that i am trying to display something on doInBackground(). I can't do any GUI work on a background thread,i get this.but i didn't use doInBackground() method directly si how can i change something that i haven't use?I simply don't konow how to fix this

CatalogActivity:public class CatalogActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<Cursor> {    Uri newUri;/** Identifier for the pet data loader */    private static final int PET_LOADER = 0;    PetCursorAdapter  mCursorAdapter;    /**     * Database helper that will provide us access to the database     */    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_catalog);        // Setup FAB to open EditorActivity        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);        fab.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Intent intent = new Intent(CatalogActivity.this, EditorActivity.class);                startActivity(intent);            }        });        // Find the ListView which will be populated with the pet data        ListView petListView = (ListView) findViewById(R.id.list);        // Find and set empty view on the ListView, so that it only shows when the list has 0 items.        View emptyView = findViewById(R.id.empty_view);        petListView.setEmptyView(emptyView);        // Setup an Adapter to create a list item for each row of pet data in the Cursor.        mCursorAdapter = new PetCursorAdapter(this, null);        // Attach the adapter to the ListView.        petListView.setAdapter(mCursorAdapter);        // Prepare the loader.  Either re-connect with an existing one,        // or start a new one.        petListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                Intent intent = new Intent(CatalogActivity.this, EditorActivity.class);                Uri curentUri = ContentUris.withAppendedId(PetContract.Pets.CONTENT_URI, id);                intent.setData(curentUri);                startActivity(intent);            }        });        getSupportLoaderManager().initLoader(PET_LOADER, null, this);    }    private void insertPet() {        ContentValues contentValues = new ContentValues();        contentValues.put(PetContract.Pets.COLUMN_NAME, "Toto");        contentValues.put(PetContract.Pets.COLUMN_BREED, "Terrier");        contentValues.put(PetContract.Pets.COLUMN_GENDER, PetContract.Pets.GENDER_MALE);        contentValues.put(PetContract.Pets.COLUMN_WEIGHT, 7);        newUri = getContentResolver().insert(                PetContract.Pets.CONTENT_URI,                contentValues        );        // Show a toast message depending on whether or not the insertion was successful        if (newUri == null) {            // If the row ID is -1, then there was an error with insertion.            Toast.makeText(this, "Error with saving pet", Toast.LENGTH_SHORT).show();        } else {            // Otherwise, the insertion was successful and we can display a toast with the row ID.            Toast.makeText(this, "Pet saved with row id: ", Toast.LENGTH_SHORT).show();        }    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu options from the res/menu/menu_catalog.xml file.        // This adds menu items to the app bar.        getMenuInflater().inflate(R.menu.menu_catalog, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // User clicked on a menu option in the app bar overflow menu        switch (item.getItemId()) {            // Respond to a click on the "Insert dummy data" menu option            case R.id.action_insert_dummy_data:                insertPet();                return true;            // Respond to a click on the "Delete all entries" menu option            case R.id.action_delete_all_entries:                // Do nothing for now                return true;        }        return super.onOptionsItemSelected(item);    }    // If non-null, this is the current filter the user has provided.    String curFilter;    @Override    public Loader<Cursor> onCreateLoader(int id, Bundle args) {          String[] projection = {                PetContract.Pets._ID,                PetContract.Pets.COLUMN_NAME,                PetContract.Pets.COLUMN_BREED,        };        return new CursorLoader(                this,                PetContract.Pets.CONTENT_URI,                 projection,                null,                null,                null);    }      @Override    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {            mCursorAdapter.swapCursor(data);    }    @Override    public void onLoaderReset(Loader<Cursor> loader) {        mCursorAdapter.swapCursor(null);    } }

my logcat:
FATAL EXCEPTION: ModernAsyncTask #2
                                                                         Process: com.example.android.pets, PID: 24569
                                                                         java.lang.RuntimeException: An error occurred while executing doInBackground()
                                                                             at android.support.v4.content.ModernAsyncTask$3.done(ModernAsyncTask.java:143)
                                                                             at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
                                                                             at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
                                                                             at java.util.concurrent.FutureTask.run(FutureTask.java:271)
                                                                             at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
                                                                             at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
                                                                             at java.lang.Thread.run(Thread.java:764)
                                                                          Caused by: java.lang.NullPointerException: uri
                                                                             at com.android.internal.util.Preconditions.checkNotNull(Preconditions.java:128)
                                                                             at android.content.ContentResolver.query(ContentResolver.java:787)
                                                                             at android.content.ContentResolver.query(ContentResolver.java:753)
                                                                             at android.support.v4.content.ContentResolverCompatJellybean.query(ContentResolverCompatJellybean.java:29)
                                                                             at android.support.v4.content.ContentResolverCompat$ContentResolverCompatImplJB.query(ContentResolverCompat.java:57)
                                                                             at android.support.v4.content.ContentResolverCompat.query(ContentResolverCompat.java:125)
                                                                             at android.support.v4.content.CursorLoader.loadInBackground(CursorLoader.java:59)
                                                                             at android.support.v4.content.CursorLoader.loadInBackground(CursorLoader.java:37)
                                                                             at android.support.v4.content.AsyncTaskLoader.onLoadInBackground(AsyncTaskLoader.java:296)
                                                                             at android.support.v4.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:54)
                                                                             at android.support.v4.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:42)
                                                                             at android.support.v4.content.ModernAsyncTask$2.call(ModernAsyncTask.java:128)
                                                                             at java.util.concurrent.FutureTask.run(FutureTask.java:266)

Norm Radder wrote:

Attempt to invoke virtual method 'void android.widget.TextView.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

Do you have code that calls: setOnClickListener?

Yes in main activity, i have an image that when user click on it it send him to this activity...but it works in other activities...only this one is making a problem...

Hello,
I wanted to use ExpandableTextView, and although it's really simple code only few lines of code i stumbled in problem
I googled it alot and i think that my probem is something about styles.xml ,because i lost preview look on android studio...but can't figured what?
I read somewere about changing styles.sml to styles-21.xml but then getting an error about duplicating something..and again i am lost in dark
I got error: FATAL EXCEPTION: main        Process: com.example.korisnik.indjijavodic, PID: 19399        java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.korisnik.indjijavodic/com.example.korisnik.indjijavodic.Ogradu}: android.view.InflateException: Binary XML file line #0: Attempt to invoke virtual method 'void android.widget.TextView .setOnClickListener(android.view.View$OnClickListener)' on a null object reference        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)        at android.app.ActivityThread.-wrap11(Unknown Source:0)        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)        at android.os.Handler.dispatchMessage(Handler.java:106)        at android.os.Looper.loop(Looper.java:164)        at android.app.ActivityThread.main(ActivityThread.java:6501)        at java.lang.reflect.Method.invoke(Native Method)        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)        Caused by: android.view.InflateException: Binary XML file line #0: Attempt to invoke virtual method 'void android.widget.TextView. setOnClickListener(android.view.View$OnClickListener)' on a null object reference        Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView .setOnClickListener(android.view.View$OnClickListener)' on a null object reference        at com.ms.square.android.expandabletextview.ExpandableTextView.findViews(ExpandableTextView

I changed styles.xml:<resources>    <!-- Base application theme. -->    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">        <!-- Customize your theme here. -->        <item name="colorPrimary">@color/colorPrimary</item>        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>        <item name="colorAccent">@color/colorAccent</item>    </style> </resources>
And Activity where is my ExpandableTextView:public class Ogradu extends AppCompatActivity{    ExpandableTextView expandableTextView;    private String istorijaGrada;    @Override    protected void onCreate( Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.o_gradu);        istorijaGrada =  "some loooong text"                        expandableTextView = findViewById(R.id.expandable_text_view);        expandableTextView.setText(istorijaGrada);    } }

And my XML:<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/oGradu">    <ImageView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:src="@drawable/img"/>    <ScrollView        android:layout_width="match_parent"        android:layout_height="wrap_content">        <com.ms.square.android.expandabletextview.ExpandableTextView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:id="@+id/expandable_text_view"            app:maxCollapsedLines="4"            app:animDuration="200">            <TextView                android:id="@+id/istorija"                android:layout_width="match_parent"                android:layout_height="match_parent"                tools:text="texts"                android:layout_margin="15dp"/>            <ImageButton                android:id="@+id/prosiri_skupi"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_gravity="right|bottom"                android:background="@android:color/transparent"                android:padding="16dp"/>        </com.ms.square.android.expandabletextview.ExpandableTextView>    </ScrollView> </LinearLayout>

Hello,
I wanted to put EditText in array.So that it can be printed several time.I don't want to make several EditText in XML i really wanted to avoid making robust xml.
I planned to make one EditText and then with loop displaying several time.
I did that with text but don't know how to do with EditText.
It should look like this:

Text    Edit text
Text    Edit text
Text    Edit text
Text    Edit text
Text    Edit text

I know for ArrayList and ArrayAdapter but i must make two more class and at the end it's the same like i made several EditTexts in XML... I want to shorten the code writing.I tried everything that i know i lost a day in something that should be an easy task....

my XML: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/root_view"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.example.korisnik.gradecardapp.MainActivity">    <TextView        android:id="@+id/lista_predmeta"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_margin="5dp"        tools:text="Prdmet" />    <EditText        android:id="@+id/lista_ocena"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:hint="ocena" />    <TextView        android:id="@+id/to_string"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_margin="5dp"        tools:text="Prdmet" /> </LinearLayout>

nad my JAVA:import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.EditText; import android.widget.TextView; import java.util.Arrays; public class MainActivity extends AppCompatActivity {    public MainActivity() {    }    private String predmeti[];    private EditText listaOcena[];    private String imeUcenika;    private int ocene;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        listaUcenika();        //listaOcena();        TextView textView = findViewById(R.id.to_string);        textView.setText(toString());    }    //This method is displaying TextView list    public String[] listaUcenika() {        predmeti = new String[5];        predmeti[0] = "Istorija";        predmeti[1] = "Matematika";        predmeti[2] = "Geografija";        predmeti[3] = "Srpski jezik";        predmeti[4] = "Engleski jezik";        for (int i = 0; i < predmeti.length; i++) {            TextView textView = findViewById(R.id.lista_predmeta);            textView.append(predmeti[i]);            textView.append("\n");        }        return predmeti;    }    //This method is displaying EditText list    // public EditText[] listaOcena() {        /*EditText editText = findViewById(R.id.lista_ocena);        listaOcena = new EditText[5];        LinearLayout holder = (LinearLayout) findViewById(R.id.root_view); int index = 0;        for(int i=0; i<holder.getChildCount(); i++){            View view = holder.getChildAt(i);            if(view  instanceof EditText){                listaOcena[index++] = (EditText) view;            }        }        return listaOcena; */    // }    @Override    public String toString() {        return predmeti[0] + " Ocena: " +                "\n" + predmeti[1]                +                "\n" + predmeti[2]                +                "\n" + predmeti[3]                +                "\n" + predmeti[4];    } }

Hello, I know that this is small and stupid question but, although I am not complelty begginer in java, i am still in beggining on my learning path.
i am making an app where user can buy books. First, all prices books had the same prices and then my "customer" said that he would like to change some prices,and  messed my workflow,my logic and my code....
How to change that.

When user click some book he will able to fill up form.In that form he will find field with quantity.App will automaticly calculate the end price.


This is my first book activity. There is seven. Price of this book is 100
public class PrvaKnjiga extends AppCompatActivity {      @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.knjiga);        PDFView pdfView  = (PDFView)findViewById(R.id.pdfView);        pdfView.fromAsset("loops.pdf").load();        pdfView.enableSwipe(true);        FloatingActionButton fab = (FloatingActionButton)findViewById(R.id.myFAB);        fab.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent prvaKnjigaIntent = new Intent(PrvaKnjiga.this, Narudzbina.class);                startActivity(prvaKnjigaIntent);            }        });        FloatingActionButton fabKontakt = (FloatingActionButton) findViewById(R.id.myFAB_kontakt);        fabKontakt.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent(Intent.ACTION_DIAL);                intent.setData(Uri.parse("tel:" + "+1111111111"));                startActivity(intent);                Toast.makeText(PrvaKnjiga.this, "Radi", Toast.LENGTH_SHORT).show();            }        });    }    }


Here is my "Order" activity.Here i am calculating price.Here is price of the first book of 100. But what to do with other prices?

public class Narudzbina extends AppCompatActivity {   String porukaGreska="";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.narudzbina);    }    public void kreiranjeNarudzbine(View v) {        EditText editTextIme = (EditText) findViewById(R.id.ime);        String imeNarucioca = editTextIme.getText().toString();        editTextIme.setText(StringUtils.capitalize(imeNarucioca.toLowerCase().trim()));        EditText editTextPrezime = (EditText) findViewById(R.id.prezime);        String prezimeNarucioca = editTextPrezime.getText().toString();        editTextPrezime.setText(StringUtils.capitalize(prezimeNarucioca.toLowerCase().trim()));        EditText editTelefonNarucioca = (EditText) findViewById(R.id.telefon);        String telefonNarucioca = editTelefonNarucioca.getText().toString();        EditText editAdresaNarucioca = (EditText) findViewById(adresa);        String adresaNarucioca = editAdresaNarucioca.getText().toString();        editAdresaNarucioca.setText(StringUtils.capitalize(adresaNarucioca.toLowerCase().trim()));        EditText editGradNarucioca = (EditText) findViewById(R.id.grad);        String gradNarucioca = editGradNarucioca.getText().toString();        editGradNarucioca.setText(StringUtils.capitalize(gradNarucioca.toLowerCase().trim()));        EditText editKolicina = (EditText) findViewById(R.id.kolicina_narucena);        String narucenaKolicina = editKolicina.getText().toString();       //  int kolicina = Integer.parseInt(narucenaKolicina);        int kolicina = 0;        try {            kolicina = Integer.parseInt(narucenaKolicina);        } catch (NumberFormatException e) {            narucenaKolicina = "";        }        int cenaNarudzbine = cena(kolicina);        String poruka = sumiranjeNarudzbine(imeNarucioca, prezimeNarucioca, telefonNarucioca, adresaNarucioca, gradNarucioca, cenaNarudzbine);        Intent smsIntent = new Intent(Intent.ACTION_VIEW);        smsIntent.setType("vnd.android-dir/mms-sms");        smsIntent.putExtra("address", "+111111111");        smsIntent.putExtra("sms_body", poruka);        if(imeNarucioca!=null && imeNarucioca.equals("")){            Toast.makeText(Narudzbina.this, "Unesite ime", Toast.LENGTH_LONG).show();        }        else if(prezimeNarucioca!=null && prezimeNarucioca.equals("")){            Toast.makeText(Narudzbina.this,"Unesite Prezime", Toast.LENGTH_LONG).show();        }        else if(telefonNarucioca!=null && telefonNarucioca.equals("")){            Toast.makeText(Narudzbina.this,"Unesite kontakt telefon", Toast.LENGTH_LONG).show();        }        else if(adresaNarucioca!=null && adresaNarucioca.equals("")){            Toast.makeText(Narudzbina.this,"Unesite adresu",Toast.LENGTH_LONG).show();        }        else if(gradNarucioca!=null && gradNarucioca.equals("")){            Toast.makeText(Narudzbina.this, "Navedite grad", Toast.LENGTH_LONG).show();        }        else if (narucenaKolicina != null && narucenaKolicina.equals("")){            Toast.makeText(Narudzbina.this, "Navedite zeljenu kolicinu", Toast.LENGTH_LONG).show();        }        else{            startActivity(smsIntent);        }    }    private int cena(int kolicina){        int cenaKnjige = 100;        cenaKnjige = kolicina * cenaKnjige;        return cenaKnjige;    }    private String sumiranjeNarudzbine(String imeNarucioca, String prezimeNarucioca, String telefonNarucioca,String adresaNarucioca,String gradNarucioca,int cenaNarudzbine) {        String poruka = "Ime: " + imeNarucioca;        poruka = poruka + "\n" + "Prezime: " + prezimeNarucioca;        poruka = poruka + "\n" + "Broj Telefona: " + telefonNarucioca ;        poruka = poruka + "\n" + "Adresa Nrucioca: " + adresaNarucioca;        poruka = poruka + "\n" + "Grad: " + gradNarucioca;        poruka = poruka + "\n" + "Cena: " + cenaNarudzbine;        return poruka;    } }

@Thank you 10000 time ))))

I am making an app where user must enter basic info about self.First name,second name, city and quantity that he or she wish to order.If he or she  skip one field toast will pop up with message what field is skipped. And that is ok.That works but if he skip quantity field I got error on my phone and it send user back on previously activity.When I inspect my LogCat I see error message java.lang.NumberFormatException: Invalid int: “” error. Now I know why that message appears.Because it expected to find Integer, if statment. but actually finds String. But do not know how to fix it.The last if/else statemen is an Issue:
Now what i tried so far:
1) Tried to set primitive int as object Integer
2)Tried to use kolicina==0;
3)Tried to use kolicina.equals(null) / kolicina.equals(0);
4)Tried to use .isEmty();

my code:package com.dsk.android.decijisvetknjiga; import android.content.Intent; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.text.Html; import android.view.View; import android.widget.EditText; import android.widget.Toast; public class Narudzbina extends AppCompatActivity {   String porukaGreska="";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.narudzbina);    }    public boolean praznoPolje(EditText et){        return (et != null && (et.equals("") || et.equals(" ")));    }    public void kreiranjeNarudzbine(View v) {        EditText editTextIme = (EditText) findViewById(R.id.ime);        String imeNarucioca = editTextIme.getText().toString();        praznoPolje(editTextIme);        EditText editTextPrezime = (EditText) findViewById(R.id.prezime);        String prezimeNarucioca = editTextPrezime.getText().toString();        praznoPolje(editTextIme);        EditText editTelefonNarucioca = (EditText) findViewById(R.id.telefon);        String telefonNarucioca = editTelefonNarucioca.getText().toString();        praznoPolje(editTelefonNarucioca);        EditText editAdresaNarucioca = (EditText) findViewById(R.id.adresa);        String adresaNarucioca = editAdresaNarucioca.getText().toString();        praznoPolje(editAdresaNarucioca);        EditText editGradNarucioca = (EditText) findViewById(R.id.grad);        String gradNarucioca = editGradNarucioca.getText().toString();        praznoPolje(editGradNarucioca);        EditText editKolicina = (EditText) findViewById(R.id.kolicina);        String narucenaKolicina = editKolicina.getText().toString();        int kolicina = Integer.parseInt(narucenaKolicina);        praznoPolje(editKolicina);        int cenaNarudzbine = cena(kolicina);        String poruka = sumiranjeNarudzbine(imeNarucioca, prezimeNarucioca, telefonNarucioca, adresaNarucioca, gradNarucioca, cenaNarudzbine);        Intent smsIntent = new Intent(Intent.ACTION_VIEW);        smsIntent.setType("vnd.android-dir/mms-sms");        smsIntent.putExtra("address", "+11111111");        smsIntent.putExtra("sms_body", poruka);        if(imeNarucioca!=null && imeNarucioca.equals("")){            Toast.makeText(Narudzbina.this, "Unesite ime", Toast.LENGTH_LONG).show();        }        else if(prezimeNarucioca!=null && prezimeNarucioca.equals("")){            Toast.makeText(Narudzbina.this,"Unesite Prezime", Toast.LENGTH_LONG).show();        }        else if(telefonNarucioca!=null && telefonNarucioca.equals("")){            Toast.makeText(Narudzbina.this,"Unesite kontakt telefon", Toast.LENGTH_LONG).show();        }        else if(adresaNarucioca!=null && adresaNarucioca.equals("")){            Toast.makeText(Narudzbina.this,"Unesite adresu",Toast.LENGTH_LONG).show();        }        else if(gradNarucioca!=null && gradNarucioca.equals("")){            Toast.makeText(Narudzbina.this, "Navedite grad", Toast.LENGTH_LONG).show();        }        else if(narucenaKolicina!=null && narucenaKolicina.equals("")){            Toast.makeText(Narudzbina.this, "Navedite zeljenu kolicinu", Toast.LENGTH_LONG).show();        }        else{            startActivity(smsIntent);        }    }

Hello ..to make long story short, root of my problem and my frustation :

I am making an app with two Floating Buttons

When user click my floating button he will be able to go to dial up screen and call phone number.For some reason doesn't work..

I already have intent,in the same activity, where he will able to go to SMS screen and be able to send a text.For some reason work just fine.

in first case nothing happened.If i put Toast in onClick listener also nothing happens.I just do not know why. Do i need to put another activity in my manifest? but this is not new activity?how to name it in my manifest....or problem is something completly different. When i say nothing happens...well nothing happens.There is no error,or some strange behavior or something else.There is no error message in my LogCat also. It is completly possible to mess up intent but my toast message also doesn't pop up.What leeds me to conclusion that i messed up something with onClickListener. But what?it is completly normal, like other listeners that i used before.Or i am just tired to see elephant in the room. I am on my computer for about 10ish hours

My full code:
package com.dsk.android.decijisvetknjiga; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.support.design.widget.FloatingActionButton; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Toast; import com.github.barteksc.pdfviewer.PDFView; public class CetvrtaKnjiga extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.knjiga);        PDFView pdfView = (PDFView) findViewById(R.id.pdfView);        pdfView.fromAsset("diskretna.pdf").load();        pdfView.enableSwipe(true);        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.myFAB);        fab.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent cetvrtaKinjigaIntent = new Intent(CetvrtaKnjiga.this, Narudzbina.class);                startActivity(cetvrtaKinjigaIntent);            }        });        FloatingActionButton fabKontakt = (FloatingActionButton) findViewById(R.id.myFAB_kontakt);        fabKontakt.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent(Intent.ACTION_DIAL);                intent.setData(Uri.parse("tel:" + "+3810629647169"));                startActivity(intent);                Toast.makeText(CetvrtaKnjiga.this, "Radi", Toast.LENGTH_SHORT).show();            }        });    } }

my full xml code:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <com.github.barteksc.pdfviewer.PDFView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/pdfView">        <android.support.design.widget.FloatingActionButton            android:id="@+id/myFAB"            android:layout_width="64dp"            android:layout_height="64dp"            android:src="@drawable/shopping_cart"            app:elevation="5dp"            app:borderWidth="0dp"            android:layout_alignParentBottom="true"            android:layout_alignParentRight="true"            android:layout_alignParentEnd="true"            android:layout_marginRight="32dp"            android:layout_marginEnd="32dp"            android:layout_marginBottom="24dp" />        <android.support.design.widget.FloatingActionButton            android:id="@+id/myFAB_kontakt"            android:layout_width="64dp"            android:layout_height="64dp"            android:src="@drawable/phone"            app:elevation="5dp"            app:borderWidth="0dp"            android:layout_alignTop="@+id/myFAB"            android:layout_alignParentLeft="true"            android:layout_alignParentStart="true"            android:layout_marginLeft="32dp"            android:layout_marginStart="32dp" />    </com.github.barteksc.pdfviewer.PDFView> </LinearLayout>

My "problematic" onClickListener is second one..this one:
FloatingActionButton fabKontakt = (FloatingActionButton) findViewById(R.id.myFAB_kontakt);        fabKontakt.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent(Intent.ACTION_DIAL);                intent.setData(Uri.parse("tel:" + "+xxxxxxx"));                startActivity(intent);                Toast.makeText(CetvrtaKnjiga.this, "Radi", Toast.LENGTH_SHORT).show();            }        });

I'm making an application that consists of the first page that will be a list of books. When you click on a picture book users will be able to flip through, something like a free sample. I was planning to do with Intent.So when someone clicks on a book picture, using the click listener and intent opens a new java class with PDF file. It displayed using PDF VIewer. But although I have no run-time error, on the phone throws an error that my application is stopped.

Surely my logic is wrong.

I inculded library compile 'com.github.barteksc:android-pdf-viewer:2.3.0'

main_activity.xml with book list:

<?xml version="1.0" encoding="utf-8"?>    <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:fillViewport="true">        <RelativeLayout xmlns:tools="http://schemas.android.com/tools"            android:id="@+id/activity_main"            android:layout_width="match_parent"            android:layout_height="match_parent"            tools:context="com.dsk.android.decijisvetknjiga.MainActivity">            <LinearLayout                android:layout_width="wrap_content"                android:layout_height="match_parent"                android:orientation="vertical">                <RelativeLayout                    android:layout_width="match_parent"                    android:layout_height="wrap_content"                    android:background="#3498DB">                    <LinearLayout                        android:layout_width="match_parent"                        android:layout_height="wrap_content"                        android:layout_alignParentLeft="true"                        android:layout_alignParentStart="true"                        android:layout_alignParentTop="true"                        android:orientation="horizontal">                        <ImageView                            android:id="@+id/slika_1"                            android:layout_width="125dp"                            android:layout_height="175dp"                            android:layout_margin="5dp"                            android:scaleType="centerCrop"                            android:src="@drawable/placeholder" />                        <TextView                            android:id="@+id/naziv_knjige_1"                            android:layout_width="0dp"                            android:layout_height="wrap_content"                            android:layout_gravity="center"                            android:layout_marginLeft="22dp"                            android:layout_weight="1"                            android:text="Naziv knjige"                            android:textSize="16sp"                            android:textStyle="bold|italic" />                        <TextView                            android:id="@+id/cena_1"                            android:layout_width="0dp"                            android:layout_height="wrap_content"                            android:layout_gravity="center"                            android:layout_marginLeft="50dp"                            android:layout_weight="1"                            android:text="00 RSD"                            android:textSize="16sp"                            android:textStyle="bold" />                    </LinearLayout>                </RelativeLayout>                <TextView                    android:layout_width="match_parent"                    android:layout_height="1dp" />                <RelativeLayout                    android:layout_width="match_parent"                    android:layout_height="wrap_content"                    android:background="#3498DB">                    <LinearLayout                        android:layout_width="match_parent"                        android:layout_height="wrap_content"                        android:layout_alignParentLeft="true"                        android:layout_alignParentStart="true"                        android:layout_alignParentTop="true"                        android:orientation="horizontal">                        <ImageView                            android:id="@+id/slika_2"                            android:layout_width="125dp"                            android:layout_height="175dp"                            android:layout_margin="5dp"                            android:scaleType="centerCrop"                            android:src="@drawable/placeholder" />                        <TextView                            android:id="@+id/naziv_knjige_2"                            android:layout_width="0dp"                            android:layout_height="wrap_content"                            android:layout_gravity="center"                            android:layout_marginLeft="22dp"                            android:layout_weight="1"                            android:text="Naziv knjige"                            android:textSize="16sp"                            android:textStyle="bold|italic" />                        <TextView                            android:id="@+id/cena_2"                            android:layout_width="0dp"                            android:layout_height="wrap_content"                            android:layout_gravity="center"                            android:layout_marginLeft="50dp"                            android:layout_weight="1"                            android:text="00 RSD"                            android:textSize="16sp"                            android:textStyle="bold" />                    </LinearLayout>                </RelativeLayout>                <TextView                    android:layout_width="match_parent"                    android:layout_height="1dp" />                <RelativeLayout                    android:layout_width="match_parent"                    android:layout_height="wrap_content"                    android:background="#3498DB">                    <LinearLayout                        android:layout_width="match_parent"                        android:layout_height="wrap_content"                        android:orientation="horizontal">                        <ImageView                            android:id="@+id/slika_3"                            android:layout_width="125dp"                            android:layout_height="175dp"                            android:layout_margin="5dp"                            android:scaleType="centerCrop"                            android:src="@drawable/placeholder" />                        <TextView                            android:id="@+id/naziv_knjige_3"                            android:layout_width="0dp"                            android:layout_height="wrap_content"                            android:layout_gravity="center"                            android:layout_marginLeft="22dp"                            android:layout_weight="1"                            android:text="Naziv knjige"                            android:textSize="16sp"                            android:textStyle="bold|italic" />                        <TextView                            android:id="@+id/cena_3"                            android:layout_width="0dp"                            android:layout_height="wrap_content"                            android:layout_gravity="center"                            android:layout_marginLeft="50dp"                            android:layout_weight="1"                            android:text="00 RSD"                            android:textSize="16sp"                            android:textStyle="bold" />                    </LinearLayout>                </RelativeLayout>                <TextView                    android:layout_width="match_parent"                    android:layout_height="1dp" />                <RelativeLayout                    android:layout_width="match_parent"                    android:layout_height="wrap_content"                    android:background="#3498DB">                    <LinearLayout                        android:layout_width="match_parent"                        android:layout_height="wrap_content"                        android:orientation="horizontal">                        <ImageView                            android:id="@+id/slika_4"                            android:layout_width="125dp"                            android:layout_height="175dp"                            android:layout_margin="5dp"                            android:scaleType="centerCrop"                            android:src="@drawable/placeholder" />                        <TextView                            android:id="@+id/naziv_knjige_4"                            android:layout_width="0dp"                            android:layout_height="wrap_content"                            android:layout_gravity="center"                            android:layout_marginLeft="22dp"                            android:layout_weight="1"                            android:text="Naziv knjige"                            android:textSize="16sp"                            android:textStyle="bold|italic" />                        <TextView                            android:id="@+id/cena_4"                            android:layout_width="0dp"                            android:layout_height="wrap_content"                            android:layout_gravity="center"                            android:layout_marginLeft="50dp"                            android:layout_weight="1"                            android:text="00 RSD"                            android:textSize="16sp"                            android:textStyle="bold" />                    </LinearLayout>                </RelativeLayout>                <TextView                    android:layout_width="match_parent"                    android:layout_height="1dp" />                <RelativeLayout                    android:layout_width="match_parent"                    android:layout_height="match_parent"                    android:background="#3498DB">                    <LinearLayout                        android:layout_width="match_parent"                        android:layout_height="wrap_content"                        android:orientation="horizontal">                        <ImageView                            android:id="@+id/slika_5"                            android:layout_width="125dp"                            android:layout_height="175dp"                            android:layout_margin="5dp"                            android:scaleType="centerCrop"                            android:src="@drawable/placeholder" />                        <TextView                            android:id="@+id/naziv_knjige_5"                            android:layout_width="0dp"                            android:layout_height="wrap_content"                            android:layout_gravity="center"                            android:layout_marginLeft="22dp"                            android:layout_weight="1"                            android:text="Naziv knjige"                            android:textSize="16sp"                            android:textStyle="bold|italic" />                        <TextView                            android:id="@+id/cena_5"                            android:layout_width="0dp"                            android:layout_height="wrap_content"                            android:layout_gravity="center"                            android:layout_marginLeft="50dp"                            android:layout_weight="1"                            android:text="00 RSD"                            android:textSize="16sp"                            android:textStyle="bold" />                    </LinearLayout>                </RelativeLayout>                <TextView                    android:layout_width="match_parent"                    android:layout_height="1dp" />                <RelativeLayout                    android:layout_width="match_parent"                    android:layout_height="match_parent"                    android:background="#3498DB">                    <LinearLayout                        android:layout_width="match_parent"                        android:layout_height="wrap_content"                        android:orientation="horizontal">                        <ImageView                            android:id="@+id/slika_6"                            android:layout_width="125dp"                            android:layout_height="175dp"                            android:layout_margin="5dp"                            android:scaleType="centerCrop"                            android:src="@drawable/placeholder" />                        <TextView                            android:id="@+id/naziv_knjige_6"                            android:layout_width="0dp"                            android:layout_height="wrap_content"                            android:layout_gravity="center"                            android:layout_marginLeft="22dp"                            android:layout_weight="1"                            android:text="Naziv knjige"                            android:textSize="16sp"                            android:textStyle="bold|italic" />                        <TextView                            android:id="@+id/cena_6"                            android:layout_width="0dp"                            android:layout_height="wrap_content"                            android:layout_gravity="center"                            android:layout_marginLeft="50dp"                            android:layout_weight="1"                            android:text="00 RSD"                            android:textSize="16sp"                            android:textStyle="bold" />                    </LinearLayout>                </RelativeLayout>            </LinearLayout>        </RelativeLayout>    </ScrollView>

XML code with PDF viewer:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <com.github.barteksc.pdfviewer.PDFView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/prvi_pdf">    </com.github.barteksc.pdfviewer.PDFView> </LinearLayout>

My JAVA class Mainctivity:
public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    ImageView imgV1 = (ImageView) findViewById(R.id.slika_1);    ImageView imgV2 = (ImageView) findViewById(R.id.slika_2);    ImageView imgV3 = (ImageView) findViewById(R.id.slika_3);    ImageView imgV4 = (ImageView) findViewById(R.id.slika_4);    ImageView imgV5 = (ImageView) findViewById(R.id.slika_5);    ImageView imgV6 = (ImageView) findViewById(R.id.slika_6);    imgV1.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View v) {            Toast.makeText(v.getContext(), "Prva Knjiga", Toast.LENGTH_SHORT).show();            Intent prvaKnjiga = new Intent(MainActivity.this, PrvaKnjiga.class);            startActivity(prvaKnjiga);        }    });    imgV2.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View v) {            Toast.makeText(v.getContext(), "Druga knjiga", Toast.LENGTH_SHORT).show();        }    });    imgV3.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View v) {            Toast.makeText(v.getContext(), "Treca knjiga", Toast.LENGTH_SHORT).show();        }    });    imgV4.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View v) {            Toast.makeText(v.getContext(), "Cetvrta knjiga", Toast.LENGTH_SHORT).show();        }    });    imgV5.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View v) {            Toast.makeText(v.getContext(), "Peta knjiga", Toast.LENGTH_SHORT).show();        }    });    imgV6.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View v) {            Toast.makeText(v.getContext(), "Sesta knjiga", Toast.LENGTH_SHORT).show();        }    }); } }

Second java class with pdf viewer:
public class PrvaKnjiga extends AppCompatActivity{ @Override protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.prva_knjiga);    PDFView pdfView  = (PDFView)findViewById(R.id.prvi_pdf);    pdfView.fromAsset("loops.pdf").load(); } }

Campbell Ritchie wrote:  You can use a Map with the id as the key and the price as the value. Alternatively, you can define a MenuItem class and use that as the map value.  You may need two Maps: one for the menu items, one for the items selected by the user.  Alternatively, if you use a MenuItem class and override its equals() and hashCode() methods, you can use a List to hold the items that were selected.

Would you believe me that i thought this also! This is huge step for me,because before, i did not know from where to start, now i at least had some (vague) idea

BTW, they are if-statements, not if-loops. A loop does something multiple times. An if-statement's body is executed only once and only when its conditional expression is true.

I know that,but was so focused on my english ;)

Thanks i will try to fix this issue with maps

Hello everyone, I'm trying to do my Android application. A rather small one
About it ... So application imitates the menu from the restaurant, when the user checks the breakfast, such as Bacon and eggs, enter his name , application on the screen repeats this information. If we want to take two different breakfasts, applications, of course, calculate Prices and prints on the screen.

private int calculatePrice(boolean firstBreakfest, boolean secondBreakfest, boolean thirdBreakfest) {        int price = 0;       if (firstBreakfest && secondBreakfest){           price = priceDish1 + priceDish2;        }       else if(firstBreakfest){           price = priceDish1;       }       else if(secondBreakfest){           price = priceDish2;        }       else if (thirdBreakfest){           price = priceDish3;       }        return price;    }

But what if the user wants to select a number of different dishes, I can not go on forever adding if loops .Or, I can?

Now where I am stuck ... in principle I did not stuck, but I was wondering if there is an easier( and more beautiful to the eye) way to calculate several variables? My code works quite ok but it would look very ugly with   dozens of  if loops. I tried to use switch / case but it can't be used with boolean.I do not know if I can do smething with lists?

How my app looks for now:


My code:
public class MainActivity extends AppCompatActivity {    int quantity = 1;    public int priceDish1 = 320; //egs and bacon    public int priceDish2 = 125; //omelet    public int priceDish3 = 200; //pancakes    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void submitOrder(View view) {        CheckBox checkedBox = (CheckBox) findViewById(R.id.dish1);        boolean firstBreakfest = checkedBox.isChecked();        CheckBox checkedBox2 = (CheckBox) findViewById(R.id.dish2);        boolean secondBreakfest = checkedBox2.isChecked();        CheckBox checkBox3 = (CheckBox) findViewById(R.id.dish3);        boolean thirdBreakfest = checkBox3.isChecked();        EditText editText = (EditText) findViewById(R.id.name_of_user);        String nameOfUser = editText.getText().toString();        int price = calculatePrice(firstBreakfest, secondBreakfest,thirdBreakfest);        String message = orderSummary(price, firstBreakfest, nameOfUser, secondBreakfest);        displayMessage(message);    }    private int calculatePrice(boolean firstBreakfest, boolean secondBreakfest, boolean thirdBreakfest) {        int price = 0;       if (firstBreakfest && secondBreakfest){           price = priceDish1 + priceDish2;        }       else if(firstBreakfest){           price = priceDish1;       }       else if(secondBreakfest){           price = priceDish2;        }       else if (thirdBreakfest){           price = priceDish3;       }        return price;    }    private String orderSummary(int price, boolean firstBreakfest, String nameOfUser, boolean secondBreakfest) {        String dish1 = "Beacon and eggs";        String dish2 = "Omelet";        String message ="Your name: " + nameOfUser;        message = message + "\nPrice: " + price + " rsd";        if(firstBreakfest && secondBreakfest){            message = message + "\nYour ordered " + dish1 + " and " + dish2;        }        else if (firstBreakfest) {            message = message +  "\nYou ordered " + dish1;        }        else if (secondBreakfest) {            message = message + "\nYou ordered " + dish2;        }        return message;    }    private void displayMessage(String message) {        TextView priceTextView = (TextView) findViewById(R.id.order_summary);        priceTextView.setText(message);    } }

I  will eventually  add more dishes so this is problematic.
Thank you and sorry for my poor english.