Check permissions in Android

MainActivity.java

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

import static android.Manifest.permission.CAMERA;

private static final int REQUEST_CODE_CAMERA = 23;


if (ContextCompat.checkSelfPermission(StylesActivity.this, CAMERA) != PackageManager.PERMISSION_GRANTED) {
    // unhappy path
    ActivityCompat.requestPermissions(StylesActivity.this, new String[]{CAMERA}, REQUEST_CODE_CAMERA);
} else {
    // happy path
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (requestCode == REQUEST_CODE_CAMERA) {
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            // user accepted to grant camera permission
        }
    }
}