Milos Gojic

Hello i am having next problem. I open same topic on StackOverflow but no answer and i am in hurry. In my json as response from server i am getting  this kind of json.I am also getting error java.lang.IllegalArgumentException: Unable to create converter for at my call method getInvestmentsInForce()
"registeredInvestments": { "percentages": {  "2": 12.02,  "8": 87.98 }, "registeredInvestmentsData": [// some other json model]

so I don't know how to change these numbers inside percentage. It won't be the same all the type but will change dynamically

My model :

public class InvestmentInForceModel {    @SerializedName("realEstate")    private List<InvestmentForceRealEstate> forceRealEstate;    @SerializedName("registeredInvestments")   private InvestmentForceRegisteredInvestments registeredInvestments;

and in my InvestmentForceRegisteredInvestments :
public class InvestmentForceRegisteredInvestments {    @SerializedName("percentages")    private Map<Integer,PercentagesInvestmentInforce> stringPercentagesInvestmentInforceMap;   // private PercentagesInvestmentInforce percentagesInvestmentInforce;    @SerializedName("registeredInvestmentsData")    private List<RegisteredInvestmentsDataModel> registeredInvestmentsDataModelList; }

and my PercentagesInvestmentInforce:
public class PercentagesInvestmentInforce {   private int investmentsType; }

if there no numbers at all then my public class PercentagesInvestmentInforce  will be empty

and my call
public Observable<InvestmentInForceModel> getInvestmentsInForce(){    return apiService.getInvestmentsInForce(); }

Hello i asked the same question few days ago on StackOverflow but no answer...and i kinda  need an answer

The problem is that Glide .listener() is triggered image by image, so when i tried to set my fragment layout invisible until all images are loaded, it set's fragment layout visibility to visible after first image is loaded and  ignores the fact that rest of images are still not loaded into imageview.
Glide checks with it's listener images by images and after first one is ready it set's my visibility t visible and i do not want this..i want to my fragment layout be invisible until all images are ready to display. Now i will basically past my SstockOverflow post here.

i have a fragment with several recycleviews that contain some text and image from users. Problem is that my images are loaded a second or less after my layout is inflated. I can't use any placeholder for that time or something else.
My instructions are that my layout must be shown only when all data and images are ready from all recyclerviews, and be shown in the same time. I am using glide .listener() method.
I tried: 1)to set boolean value in .listener() and save it in SharedPref and load it in my fragment where my recycleviews are and if Boolean value is the same then set visibility of fragment to visible ,which previously was set to invisible
2) to do the same thing just with custom callbacks
3)and this solution that i am going to past here. Basically i am passing my layout to adapter with constructor and setting it invisible in .listener().



my glide in adapter:
if (listaSvihMembersa.get(i).getId() == modelClass.getMemberId()) {                Glide.with(context)                        .load(listaSvihMembersa.get(i).getImageUrl())                        .circleCrop()                        .placeholder(R.drawable.ic_joint)                        .listener(new RequestListener<Drawable>() {                            @Override                            public boolean onLoadFailed(@Nullable GlideException e, Object model, Target<Drawable> target, boolean isFirstResource) {                                nestedScrollView.setVisibility(View.VISIBLE);                                return false;                            }                            @Override                            public boolean onResourceReady(Drawable resource, Object model, Target<Drawable> target, DataSource dataSource, boolean isFirstResource) {                                nestedScrollView.setVisibility(View.VISIBLE);                                return false;                            }                        })                        .into(binding.detailedListIMG);            }
and my adapter:
` private void setUpCurrentLifeInsurance(List<CurrentLifeInsurance> familyProtectionAdapterList) {        currentLifeInsuranceRecycleView = binding.rvCurrentLifeInsuranceList;        FamilyProtectionAdapter adapter = new FamilyProtectionAdapter(familyProtectionAdapterList, context, this, this, currentLifeInsuranceRecycleView,binding.nestedScrollView);        currentLifeInsuranceRecycleView.setAdapter(adapter);        // recyclerView.setHasFixedSize(true);        currentLifeInsuranceRecycleView.setLayoutManager(new LinearLayoutManager(context));    }`

Norm Radder wrote:

 won't update to server

What server are you talking about?  What protocol are you using to send the String to the server?

Why do you have to use the debugger to see the error message?  Can the code receive/extract the message and print it on the logcat?

I am using retrofit and okhttp...and sung a HashMap to send all data to the server..  but what is weird is that i got some base64
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
but getting that error

Norm Radder wrote:

my app doesn't crash

What happens when you execute the app?

Simply won't update to server. If i go to debug then i see 400 bad request and in error body i got that error, but my app doesn't crash simply wont do what is supposed to do..

Norm Radder wrote:

i am getting this error.

Can you copy the stacktrace from the logcat and paste it here so we can see the full error?

my app doesn't crash i am getting ths error in my debugger

I posted this question earlier today on StackOverflow,but without answer ,and need this to be solved tonight, that's why am also posting it here...so sorry for cross posting but i am desperate :\

so basically when i try to send string to server i am getting this error.I am trying to send image ,as string, with SharedPreferences from fragment to viewModel and then send it with other data that server expect

my fragment code: @Override    public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {        super.onActivityResult(requestCode, resultCode, data);        if (requestCode == 1 && resultCode == RESULT_OK && data != null) {            Uri selectedImageUri = data.getData();            imgUriString = selectedImageUri.toString();            try {                bitmap = MediaStore.Images.Media.getBitmap(context.getContentResolver(), selectedImageUri);                binding.addReceiptIB.setImageBitmap(bitmap);            } catch (IOException e) {                e.printStackTrace();            }            SharedPref.setImagePath(bitMapToString(bitmap));             //            //send this encoded string to server        //    imgUriString = selectedImageUri.toString(); //                binding.addReceiptIB.setImageURI(selectedImageUri);                    }    } public String bitMapToString(Bitmap bitmap) {        ByteArrayOutputStream baos = new ByteArrayOutputStream();        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);        byte[] b = baos.toByteArray();        return Base64.encodeToString(b, Base64.DEFAULT);    }

and in my view model i reciving and seting this image this wey:
public void onCickAddReceipt(View view) {        model.setImage(SharedPref.getImagePath());        callBack.onCickAddReceipt();    }

I posted this question the other day on StackOverflow, but wasn't able to get a good answer, so now I'm asking here...
I am having a spinner that should be filled with strings.But can not use binding.mySpinner to set adapter. The Goal is to have two spinners first is with two country USA and CANADA so when user click on Usa second spinner should list all states.Same thing for Canada.I managed to find out what country is clicked and i stored that value in String.I wanted to use simple If/else statement but do not know how to fill second spinner.

my xml:`<Spinner                android:id="@+id/country_spinner"                style="@style/Widget.AppCompat.DropDownItem.Spinner"                android:layout_width="0dp"                android:layout_height="wrap_content"                android:layout_marginBottom="25dp"                app:onItemSelectedListener="@{updateCreditCard.countryListener}"                android:entries="@array/countries_array"                app:layout_constraintBottom_toTopOf="@+id/divider_view"                app:layout_constraintEnd_toEndOf="parent"                app:layout_constraintStart_toStartOf="parent"                app:layout_constraintTop_toBottomOf="@+id/country_TV" />            <View                android:id="@+id/divider_view"                android:layout_width="match_parent"                android:layout_height="1dp"                android:layout_marginStart="8dp"                android:layout_marginEnd="8dp"                android:layout_marginBottom="25dp"                android:background="@color/hints_black"                app:layout_constraintBottom_toTopOf="@+id/states_TV"                app:layout_constraintEnd_toEndOf="parent"                app:layout_constraintStart_toStartOf="parent"                app:layout_constraintTop_toBottomOf="@+id/country_spinner" />            <TextView                android:id="@+id/states_TV"                android:layout_width="0dp"                android:layout_height="wrap_content"                android:layout_marginStart="8dp"                android:layout_marginEnd="8dp"                android:layout_marginBottom="8dp"                android:text="State *"                app:layout_constraintBottom_toTopOf="@+id/states_spinner"                app:layout_constraintEnd_toEndOf="parent"                app:layout_constraintStart_toStartOf="parent"                app:layout_constraintTop_toBottomOf="@+id/divider_view" />            <Spinner                android:id="@+id/states_spinner"                style="@style/Widget.AppCompat.DropDownItem.Spinner"                android:layout_width="0dp"                android:layout_height="wrap_content"                android:layout_marginBottom="50dp"                app:onItemSelectedListener="@{updateCreditCard.stateListener}"                app:layout_constraintBottom_toTopOf="@+id/submit_BTN"                app:layout_constraintEnd_toEndOf="parent"                app:layout_constraintStart_toStartOf="parent"                app:layout_constraintTop_toBottomOf="@+id/states_TV" />

and my ViewModel:
public AdapterView.OnItemSelectedListener stateListener = new AdapterView.OnItemSelectedListener() {        @Override        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {        }        @Override        public void onNothingSelected(AdapterView<?> parent) {        }    };            public void handleSpinner(View view){        creditCardCallback.handleSpinner();        }    public AdapterView.OnItemSelectedListener countryListener = new AdapterView.OnItemSelectedListener() {        @Override        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {            Object item = parent.getItemAtPosition(position).toString();            switch (position) {                case 0:                    selectedCountry = billingInfo.getCountry();                    Log.i(item.toString(), "1");                    Log.i("Id Drzave", billingInfo.getCountry() + "");                    Log.i("Selektovana drzava: ", selectedCountry);                    break;                case 1:                    selectedCountry = billingInfo.getCountry();                    Log.i(item.toString(), "2");                    Log.i("Id Drzave", billingInfo.getCountry() + "");                    Log.i("Selektovana drzava: ", selectedCountry);                    break;            }        }        @Override        public void onNothingSelected(AdapterView<?> parent) {        }    };

Norm Radder wrote:

java.lang.NullPointerException: Attempt to read from field 'android.widget.TextView com.nswd.successplan.databinding.TvContentBinding.markerValue' on a null object reference
   at com.nswd.successplan.model.HomePieChartMarkerViewModel.refreshContent(HomePieChartMarkerViewModel.java:32)

What variable on line 32 has the null value?  Backtrack in the code to see why that variable is null.

that is line 17 here in post

it seems that private TvContentBinding binding; is problem.Because it gives me a warning that is not assigned...and i don't know how to do it

I know what is this exception is and I know that there are a lot of similiar questions. But I can't apply those solutions to my problem. Everything works fine when I am using findById() but when I am trying to use data binding I got stuck. I am new in data binding.

public class HomePieChartMarkerViewModel extends MarkerView { private TvContentBinding binding; /** * Constructor. Sets up the MarkerView with a custom layout resource. * * @param context * @param layoutResource the layout resource to use for the MarkerView */ public HomePieChartMarkerViewModel(Context context, int layoutResource) {    super(context, layoutResource); } @Override public void refreshContent(Entry e, Highlight highlight) {    binding.markerValue.setText("$ " + e.getY());// <<<< HERE I GOT AN ERROR    super.refreshContent(e,highlight); } private MPPointF mOffset; @Override public MPPointF getOffset() {    if(mOffset == null) {        // center the marker horizontally and vertically        mOffset = new MPPointF(-(getWidth() / 2), -getHeight());    }    return mOffset; } }
and i am calling this class in my fragment:
IMarker marker = new HomePieChartMarkerViewModel(context,R.layout.tv_content);    binding.myMonthlyExpenditureSingleLineChart.setMarker(marker);

my xml tv_content
<layout> <data>    <variable        name="chart_marker"        type="com.nswd.successplan.model.HomePieChartMarkerViewModel" /> </data> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="horizontal"    android:paddingStart="8dp"    android:paddingEnd="8dp" android:background="@drawable/tv_content_rounded"    android:gravity="center">    <ImageView        android:layout_width="wrap_content"        android:layout_height="match_parent"        android:src="@drawable/ic_bulet_blue"        android:paddingEnd="8dp"/>    <TextView        android:id="@+id/marker_value"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="985"        android:textSize="12sp"        android:textColor="@color/background"/> </LinearLayout>

my error
java.lang.NullPointerException: Attempt to read from field 'android.widget.TextView com.nswd.successplan.databinding.TvContentBinding.markerValue' on a null object reference    at com.nswd.successplan.model.HomePieChartMarkerViewModel.refreshContent(HomePieChartMarkerViewModel.java:32)    at com.github.mikephil.charting.charts.Chart.drawMarkers(Chart.java:741)    at com.github.mikephil.charting.charts.BarLineChartBase.onDraw(BarLineChartBase.java:285)    at android.view.View.draw(View.java:23191)    at android.view.View.updateDisplayListIfDirty(View.java:22066)    at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:5214)    at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:5186)    at android.view.View.updateDisplayListIfDirty(View.java:22021)    at android.view.View.draw(View.java:22921)

I need to make a list in my NestedScrollView but showing only first element. I tried with android:fillViewport="true" but hothing happened. I know that ListView has scrollable incorporated in itself.

my xml :<layout > <data>    <variable        name="home"        type="com.nswd.successplan.ui.fragments.homeFragment.HomeViewModel" /> </data> <androidx.core.widget.NestedScrollView    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="#f0f4f7"    android:fillViewport="true"    tools:context=".ui.fragments.homeFragment.HomeFragment">    <androidx.constraintlayout.widget.ConstraintLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_margin="8dp"        android:background="#f0f4f7">       // XML code ...        <LinearLayout            android:id="@+id/pie_chart_expenditures_LL"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:background="#ffffff"            android:orientation="vertical"            app:layout_constraintBottom_toTopOf="@+id/list_view_pie_chart_legend"            app:layout_constraintEnd_toEndOf="parent"            app:layout_constraintStart_toStartOf="parent"            app:layout_constraintTop_toBottomOf="@+id/pie_chart_expenditures_TV">            <com.github.mikephil.charting.charts.PieChart                android:id="@+id/pie_chart_reports_home"                android:layout_width="match_parent"                android:layout_height="400dp" />        </LinearLayout>        <ListView            android:id="@+id/list_view_pie_chart_legend"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:background="#ffffff"            android:layout_marginBottom="8dp"            app:layout_constraintBottom_toTopOf="parent"            app:layout_constraintEnd_toEndOf="parent"            app:layout_constraintStart_toStartOf="parent"            app:layout_constraintTop_toBottomOf="@+id/pie_chart_expenditures_LL"            tools:listitem="@layout/pie_chart_list_item" />    </androidx.constraintlayout.widget.ConstraintLayout> </androidx.core.widget.NestedScrollView>

my pie_chart_list_item:
<layout>    <data>        <variable            name="legend"            type="com.nswd.successplan.model.PieChartLegendModel" />    </data>    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginBottom="10dp"        android:orientation="horizontal"        android:padding="4dp">        <ImageView            android:id="@+id/legend_color"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:src="@drawable/ic_dot_list_item_pie_chart" />        <TextView            android:id="@+id/expenditure"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_gravity="center"            android:layout_marginStart="10dp"            android:layout_weight="1"            android:text="Debt Payments"            android:textColor="#197ad8" />        <TextView            android:id="@+id/costs_expenditure"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_weight="1"            android:gravity="end"            android:text="7,555" />    </LinearLayout> </layout>

I am making simple app in wich user will able to search for books by its name,with google.com book api.For now i wish to present list of books with android in their name.I am doing it woth Retrofit2 and RecycleView,but nothing is showing.I am assyming that problem is in my @query request in RetroFit2,but do not know how to handle this problem on my own

my MainActivity:
public class MainActivity extends AppCompatActivity { RecyclerView recyclerView; List<KnjigaModel> listaKnjiga; RecicleViewKnjiga recicleViewKnjiga; Button button; KnjigaApi knjigaApi; @Override protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    button = findViewById(R.id.dugme_za_pretragu);    uzmiKomentare(); } public void uzmiKomentare() {    Gson gson = new GsonBuilder().serializeNulls().create();    Retrofit retrofit = new Retrofit.Builder()            .baseUrl("https://www.googleapis.com/")            .addConverterFactory(GsonConverterFactory.create(gson))            .build();    knjigaApi = retrofit.create(KnjigaApi.class);    Call<List<KnjigaModel>> pozivZaKomentare = knjigaApi.getKnjige("android");    pozivZaKomentare.enqueue(new Callback<List<KnjigaModel>>() {        @Override        public void onResponse(Call<List<KnjigaModel>> call, Response<List<KnjigaModel>> response) {            if (!response.isSuccessful()) {                return;            }            generateRecycleView(response.body());        }        @Override        public void onFailure(Call<List<KnjigaModel>> call, Throwable t) {        }    }); } private void generateRecycleView(List<KnjigaModel> knjige) {    listaKnjiga = new ArrayList<>();    recyclerView = findViewById(R.id.recycle_view);    recicleViewKnjiga = new RecicleViewKnjiga(this, knjige);    recyclerView.setLayoutManager(new LinearLayoutManager(this));    recyclerView.setAdapter(recicleViewKnjiga);    recicleViewKnjiga.notifyDataSetChanged(); }

and my api inteface:
public interface KnjigaApi { @GET("books/v1/volumes{knjiga}&filter=paid-ebooks&maxResults=40") Call<List<KnjigaModel>> getKnjige(@Path("knjiga") String knjiga);}

my recycleview:
public class RecicleViewKnjiga extends RecyclerView.Adapter<RecicleViewKnjiga.KomentariViewHolder> { private List<KnjigaModel> listaKnjiga; private Context context; public RecicleViewKnjiga(Context context, List<KnjigaModel> listaKnjiga) {    this.listaKnjiga = listaKnjiga;    this.context = context; } @Override public KomentariViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {    Context context = parent.getContext();    LayoutInflater inflater = LayoutInflater.from(context);    // Inflate the custom layout    View postView = inflater.inflate(R.layout.single_item, parent, false);    // Return a new holder instance    return new KomentariViewHolder(postView); } @Override public void onBindViewHolder(KomentariViewHolder holder, int position) {    KnjigaModel knjige = listaKnjiga.get(position);    holder.naslovKnjige.setText(knjige.getImeKnjige());    holder.imeAutora.setText(knjige.getImeAutora());    Glide.with(context)            .load(knjige.getSlikaKnjige())            .into(holder.slikaKnjige); } @Override public int getItemCount() {    return listaKnjiga.size(); } public class KomentariViewHolder extends RecyclerView.ViewHolder {    private TextView naslovKnjige;    private TextView imeAutora;    private ImageView slikaKnjige;    public KomentariViewHolder(View itemView) {        super(itemView);        naslovKnjige = itemView.findViewById(R.id.ime_knjige);        imeAutora = itemView.findViewById(R.id.autor_knjige);        slikaKnjige = itemView.findViewById(R.id.sika_korica);    } }}
my model class:
public class KnjigaModel { @SerializedName("title") private String imeKnjige; @SerializedName("authors") private String imeAutora; @SerializedName("thumbnail") private String slikaKnjige; public KnjigaModel(String imeKnjige, String imeAutora,String slikaKnjige) {    this.imeKnjige = imeKnjige;    this.imeAutora = imeAutora;    this.slikaKnjige = slikaKnjige; } public String getImeKnjige() {    return imeKnjige; } public String getImeAutora() {    return imeAutora; } public String getSlikaKnjige() {    return slikaKnjige; }

Norm Radder wrote:I think the problem is that the InputStreamReader on line 24 has read all the contents of the stream into its buffer and the read statement returns the first character from the buffer: {    Note (char)123 is {
There is no more data in the stream so the InputStream used on line 28 returns the -1.
Try using the InuputStreamReader for all the reads, not the InputStream.

I used BufferedReader and now it works fine...you were right problem was in in InputStream... hahahah what a sleepless night

Norm Radder wrote:Try adding a print statement after the statements  on lines 24 and 28 that print out the value of podaci so you can see what is read.

in line 24
In my line 24 it shows number 123
2020-05-18 12:06:58.232 20543-20580/com.example.jsondownload I/Show data line 24: 123
but in line 28 it shows -1 ???
2020-05-18 12:04:08.825 19836-19942/com.example.jsondownload I/Show data line 28: -1
so in my while loop shows that podaci(data) are -1 and stop printing in log...but why??



EDIT: When i put this code : int code = httpURLConnection.getResponseCode();                if (code != HttpsURLConnection.HTTP_OK) {                    Log.i("SUccess: ", String.valueOf(inputStream));                } else {                    Log.i("Failed: ", String.valueOf(inputStream));                }

my second log,in else, is activated like it's failed.
Prints: buffer(com.android.okhttp.internal.http.Http1xStream$FixedLengthSource@315ebb4).inputStream()