Run Time app permission

[priyanshi bhardwaj]

Hi I am trying to make an app using view pager with two fragments one fragment for camera and second fragment for contact List which requires permissions for accessing contact lists and camera.When I am installing its apk My Application is crashing.There is some problem in fetching permission from the users kindly have a look at my code and error and please suggest a solution.I am sharing code for Contacts and camera fragment.I am requesting for permissions in there particular fragments.
This is Camera Fragment

package com.example.viewpagerexample.fragment;
import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.databinding.DataBindingUtil;
import androidx.fragment.app.Fragment;
import com.example.viewpagerexample.R;
import com.example.viewpagerexample.databinding.FragmentCameraBinding;
import com.example.viewpagerexample.viewmodel.CameraVM;
import com.google.android.material.snackbar.Snackbar;

public class CamerFragment extends Fragment {
    private FragmentCameraBinding binding;
    private CameraVM cameraVM;
    private static final int PERMISSIONS_REQUEST_CAMERA = 123;

    public CamerFragment() {
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_camera, container, false);
        this.binding = DataBindingUtil.bind(view);
        this.cameraVM = new CameraVM(this, binding);
        binding.setCameraView(cameraVM);
        getCameraPermission();
        return view;
    }

    private boolean getCameraPermission() {
        if(getActivity().checkSelfPermission(Manifest.permission.CAMERA)!= PackageManager.PERMISSION_GRANTED){
            requestPermissions(new String[]{Manifest.permission.CAMERA}, PERMISSIONS_REQUEST_CAMERA);
        }else {
            cameraVM.startCamera();
        }
        return true;
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        switch (requestCode) {
            case PERMISSIONS_REQUEST_CAMERA:
                if (grantResults.length > 0) {
                    boolean readCamera = grantResults[0] == PackageManager.PERMISSION_GRANTED;
                    if ( readCamera) {
                        cameraVM.startCamera();
                        return;
                    } else {
                        Snackbar.make(this.getActivity().findViewById(android.R.id.content),
                                "Please Grant Permissions",
                                Snackbar.LENGTH_INDEFINITE).setAction("ENABLE",
                                new View.OnClickListener() {
                                    @Override
                                    public void onClick(View v) {
                                        requestPermissions(
                                                new String[]{Manifest.permission
                                                        .CAMERA},
                                                PERMISSIONS_REQUEST_CAMERA);
                                    }
                                }).show();
                    }
                }
                break;
        }}
}

This is my contacts Fragment

 package com.example.viewpagerexample.fragment;
import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.databinding.DataBindingUtil;
import com.example.viewpagerexample.R;
import com.example.viewpagerexample.databinding.FragmentContactListBinding;;
import com.example.viewpagerexample.viewmodel.ContactVM;
import com.google.android.material.snackbar.Snackbar;

public class ContactListFragment extends BaseFragment {
    FragmentContactListBinding binding;
    private static final int PERMISSIONS_REQUEST_CONTACTS = 123;

    public ContactListFragment() {
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            View  view = inflater.inflate(R.layout.fragment_contact_list,container,false);
            binding = DataBindingUtil.bind(view);
            ContactVM contactVM = new ContactVM(this,binding);
            binding.setContactView(contactVM);
            getContactPermission();
        return view;
    }

    private boolean getContactPermission(){
        if(getActivity().checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)+getActivity().checkSelfPermission( Manifest.permission.READ_CONTACTS)
                != PackageManager.PERMISSION_GRANTED){
            requestPermissions(new String[]{Manifest.permission
                    .READ_EXTERNAL_STORAGE, Manifest.permission.READ_CONTACTS}, PERMISSIONS_REQUEST_CONTACTS);
        }
        return true;
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions,int[] grantResults) {
        switch (requestCode) {
            case PERMISSIONS_REQUEST_CONTACTS:
                if (grantResults.length > 0) {
                    boolean readExternalFile = grantResults[0] == PackageManager.PERMISSION_GRANTED;
                    boolean readContacts = grantResults[1] == PackageManager.PERMISSION_GRANTED;
                    if ( readExternalFile && readContacts ) {
                        // write your logic here
                        return;
                    } else {
                        Snackbar.make(this.getActivity().findViewById(android.R.id.content),
                                "Please Grant Permissions",
                                Snackbar.LENGTH_INDEFINITE).setAction("ENABLE",
                                new View.OnClickListener() {
                                    @Override
                                    public void onClick(View v) {
                                        requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.READ_CONTACTS},PERMISSIONS_REQUEST_CONTACTS);
                                      }
                                }).show();
                    }
                }
                break;
        }
    }


}

Error is

2019-07-05 12:12:53.265 21078-21078/? E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.viewpagerexample, PID: 21078
    java.lang.SecurityException: Permission Denial: opening provider com.android.providers.contacts.ContactsProvider2 from ProcessRecord{49eb736 21078:com.example.viewpagerexample/u0a256} (pid=21078, uid=10256) requires android.permission.READ_CONTACTS or android.permission.WRITE_CONTACTS
        at android.os.Parcel.readException(Parcel.java:1951)
        at android.os.Parcel.readException(Parcel.java:1897)
        at android.app.IActivityManager$Stub$Proxy.getContentProvider(IActivityManager.java:4919)
        at android.app.ActivityThread.acquireProvider(ActivityThread.java:6107)
        at android.app.ContextImpl$ApplicationContentResolver.acquireUnstableProvider(ContextImpl.java:2517)
        at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:1780)
        at android.content.ContentResolver.query(ContentResolver.java:738)
        at android.content.ContentResolver.query(ContentResolver.java:704)
        at android.content.ContentResolver.query(ContentResolver.java:662)
        at com.example.viewpagerexample.viewmodel.ContactVM.setData(ContactVM.java:38)
        at com.example.viewpagerexample.viewmodel.ContactVM.<init>(ContactVM.java:29)
        at com.example.viewpagerexample.fragment.ContactListFragment.onCreateView(ContactListFragment.java:33)
        at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2439)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1460)
        at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852)
        at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:802)
        at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625)
        at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411)
        at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366)
        at androidx.fragment.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:2243)
        at androidx.fragment.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:654)
        at androidx.fragment.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:146)
        at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1244)
        at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1092)
        at androidx.viewpager.widget.ViewPager.onMeasure(ViewPager.java:1622)
        at android.view.View.measure(View.java:22386)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6762)
        at androidx.coordinatorlayout.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:733)
        at com.google.android.material.appbar.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:95)
        at com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1556)
        at androidx.coordinatorlayout.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:803)
        at android.view.View.measure(View.java:22386)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6762)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:191)
        at androidx.appcompat.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:143)
        at android.view.View.measure(View.java:22386)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6762)
        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1644)
        at android.widget.LinearLayout.measureVertical(LinearLayout.java:819)
        at android.widget.LinearLayout.onMeasure(LinearLayout.java:687)
        at android.view.View.measure(View.java:22386)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6762)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:191)
        at android.view.View.measure(View.java:22386)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6762)
        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1644)
2019-07-05 12:12:53.266 21078-21078/? E/AndroidRuntime:     at android.widget.LinearLayout.measureVertical(LinearLayout.java:819)
        at android.widget.LinearLayout.onMeasure(LinearLayout.java:687)
        at android.view.View.measure(View.java:22386)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6762)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:191)
        at com.android.internal.policy.DecorView.onMeasure(DecorView.java:743)
        at android.view.View.measure(View.java:22386)
        at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2802)
        at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1742)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2015)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1627)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7507)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:948)
        at android.view.Choreographer.doCallbacks(Choreographer.java:750)
        at android.view.Choreographer.doFrame(Choreographer.java:682)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:934)
        at android.os.Handler.handleCallback(Handler.java:869)
        at android.os.Handler.dispatchMessage(Handler.java:101)
        at android.os.Looper.loop(Looper.java:206)
        at android.app.ActivityThread.main(ActivityThread.java:6784)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:852)
2019-07-05 12:21:01.427 21304-21304/? E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.viewpagerexample, PID: 21304
    java.lang.SecurityException: Permission Denial: opening provider com.android.providers.contacts.ContactsProvider2 from ProcessRecord{e9a3a76 21304:com.example.viewpagerexample/u0a256} (pid=21304, uid=10256) requires android.permission.READ_CONTACTS or android.permission.WRITE_CONTACTS
        at android.os.Parcel.readException(Parcel.java:1951)
        at android.os.Parcel.readException(Parcel.java:1897)
        at android.app.IActivityManager$Stub$Proxy.getContentProvider(IActivityManager.java:4919)
        at android.app.ActivityThread.acquireProvider(ActivityThread.java:6107)
        at android.app.ContextImpl$ApplicationContentResolver.acquireUnstableProvider(ContextImpl.java:2517)
        at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:1780)
        at android.content.ContentResolver.query(ContentResolver.java:738)
        at android.content.ContentResolver.query(ContentResolver.java:704)
        at android.content.ContentResolver.query(ContentResolver.java:662)
        at com.example.viewpagerexample.viewmodel.ContactVM.setData(ContactVM.java:38)
        at com.example.viewpagerexample.viewmodel.ContactVM.<init>(ContactVM.java:29)
        at com.example.viewpagerexample.fragment.ContactListFragment.onCreateView(ContactListFragment.java:33)
        at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2439)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1460)
        at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852)
        at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:802)
        at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManager.java:2625)
        at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2411)
        at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2366)
        at androidx.fragment.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:2243)
        at androidx.fragment.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:654)
        at androidx.fragment.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:146)
        at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1244)
        at androidx.viewpager.widget.ViewPager.populate(ViewPager.java:1092)
        at androidx.viewpager.widget.ViewPager.onMeasure(ViewPager.java:1622)
        at android.view.View.measure(View.java:22386)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6762)
        at androidx.coordinatorlayout.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:733)
        at com.google.android.material.appbar.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:95)
        at com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1556)
        at androidx.coordinatorlayout.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:803)
        at android.view.View.measure(View.java:22386)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6762)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:191)
        at androidx.appcompat.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:143)
        at android.view.View.measure(View.java:22386)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6762)
        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1644)
        at android.widget.LinearLayout.measureVertical(LinearLayout.java:819)
        at android.widget.LinearLayout.onMeasure(LinearLayout.java:687)
        at android.view.View.measure(View.java:22386)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6762)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:191)
        at android.view.View.measure(View.java:22386)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6762)
        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1644)
2019-07-05 12:21:01.428 21304-21304/? E/AndroidRuntime:     at android.widget.LinearLayout.measureVertical(LinearLayout.java:819)
        at android.widget.LinearLayout.onMeasure(LinearLayout.java:687)
        at android.view.View.measure(View.java:22386)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6762)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:191)
        at com.android.internal.policy.DecorView.onMeasure(DecorView.java:743)
        at android.view.View.measure(View.java:22386)
        at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2802)
        at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1742)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2015)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1627)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7507)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:948)
        at android.view.Choreographer.doCallbacks(Choreographer.java:750)
        at android.view.Choreographer.doFrame(Choreographer.java:682)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:934)
        at android.os.Handler.handleCallback(Handler.java:869)
        at android.os.Handler.dispatchMessage(Handler.java:101)
        at android.os.Looper.loop(Looper.java:206)
        at android.app.ActivityThread.main(ActivityThread.java:6784)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:852)

[Tim Moores]

As the stack trace shows, the error occurs in ContactVM.setData(ContactVM.java:38) (which you didn't post). Apparently that code needs the contact permission and doesn't have it.

[priyanshi bhardwaj]

Thanks this problem is sorted but getting some other problem in camera fragment the app is launching I get the options for accessing contacts and external storage.but permission for camera is not asked at this time.But if I again open the app then permission for camera is asked.I mean to say all three permissions(Contacts,Camera,External Storage )is not asked at the same time.When my app opens Contacts Fragment is shown.And I am not getting any stack trace also.

[Tim Moores]

Check which permissions the app has. Sometimes reinstalling the app via USB removes them, but not always in my experience.

[priyanshi bhardwaj]

Tim Moores wrote:Check which permissions the app has. Sometimes reinstalling the app via USB removes them, but not always in my experience.

In Manifest I have declared all the permissions it's just requestPermission method is getting called two times 1. In Contacts fragment(for contacts permission)   2. in Camera Fragment (for camera permission) so when the app in launching for the first time then Contacts Fragments get's opened so I think so app only asks for permissions required for contacts Fragments.But again when app is opened then it definitely asks for permission for camera also.How to fix this?

[priyanshi bhardwaj]

I just want all the three permissions(camera,contacts and external storage) are asked at the launching time of app.