EasyPermissions

EasyPermissions

implementation 'pub.devrel:easypermissions:1.3.+'

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/btn_permission"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="request Permission"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

public class MainActivity extends AppCompatActivity implements EasyPermissions.PermissionCallbacks {

    public static final int REQUEST_CODE = 123;
    Button btnOpenCamera;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btnOpenCamera = findViewById(R.id.btn_permission);
        btnOpenCamera.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                openCamera();
            }
        });

    }

    @AfterPermissionGranted(REQUEST_CODE)
    private void openCamera() {
        String[] perms = {Manifest.permission.CAMERA, Manifest.permission.READ_EXTERNAL_STORAGE};
        if (EasyPermissions.hasPermissions(this, perms)) {
            Toast.makeText(this, "Open Camera ", Toast.LENGTH_SHORT).show();
        } else {
            EasyPermissions.requestPermissions(this, "we need permission ", REQUEST_CODE, perms);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
    }

    @Override
    public void onPermissionsGranted(int requestCode, @NonNull List<String> perms) {
        Log.d("TAG", "why not call ");
    }

    @Override
    public void onPermissionsDenied(int requestCode, @NonNull List<String> perms) {
        if (EasyPermissions.somePermissionDenied(this, String.valueOf(perms))) {
            new AppSettingsDialog.Builder(this).build().show();
            Log.d("TAG", "onPermissionDenied if in ~");
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        Log.d("TAG", "onActivityResult if in method  ~");
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == AppSettingsDialog.DEFAULT_SETTINGS_REQ_CODE) {
            Log.d("TAG", "onActivityResult if in ~");
        }
    }
}