RxPermissions sample codes

RxPermissionsDemoActivity.java

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        rxPermissions = RxPermissions.getInstance(this);
        rxPermissions.setLogging(true);

        setContentView(R.layout.act_main);
        surfaceView = (SurfaceView) findViewById(R.id.surfaceView);

        RxView.clicks(findViewById(R.id.enableCamera))
                // Ask for permissions when button is clicked
                .compose(rxPermissions.ensure(Manifest.permission.CAMERA))
                .subscribe(new Action1<Boolean>() {
                               @Override
                               public void call(Boolean granted) {
                                   Log.i(TAG, "Permission result " + granted);
                                   if (granted) {
                                       releaseCamera();
                                       camera = Camera.open(0);
                                       try {
                                           camera.setPreviewDisplay(surfaceView.getHolder());
                                           camera.startPreview();
                                       } catch (IOException e) {
                                           Log.e(TAG, "Error while trying to display the camera preview", e);
                                       }
                                   } else {
                                       Toast.makeText(MainActivity.this,
                                               "Permission denied, can't enable the camera",
                                               Toast.LENGTH_SHORT).show();
                                   }
                               }
                           },
                        new Action1<Throwable>() {
                            @Override
                            public void call(Throwable t) {
                                Log.e(TAG, "onError", t);
                            }
                        },
                        new Action0() {
                            @Override
                            public void call() {
                                Log.i(TAG, "OnComplete");
                            }
                        });
    }