如何设置处理程序以在 android 工作室中显示 imageview

Question

I want to show some views after a delay after clicking the button but it doesn't work I can't find the problem or maybe this code not working

I set the image to invisible and want to show it after 26s of clicking the button can anybody help me?

this is a full code of activity

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);

    setContentView(R.layout.activity_enter);


    ImageView yourImage = findViewById(R.id.allRightRegistered);

    final Handler handler = new Handler();
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            yourImage.setVisibility(View.VISIBLE);
        }
    }, 26000);

    VideoView videoview = findViewById(R.id.videoView);
    Uri uri = Uri.parse("android.resource://"+getPackageName()+"/"+R.raw.intromovie);
    videoview.setVideoURI(uri);
    videoview.start();
}





@Override
public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    if (hasFocus) {
        getWindow().getDecorView().setSystemUiVisibility(
                View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                        | View.SYSTEM_UI_FLAG_FULLSCREEN
                        | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
    }
}

}

and its my xml code

<VideoView
    android:id="@+id/videoView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<Button
    android:id="@+id/Enter_Btn"
    android:layout_width="300dp"
    android:layout_height="90dp"
    android:text="Im Ready To Enter\nCoffee Melody"
    android:textSize="18sp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.497"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.499" />

<ImageView
    android:id="@+id/allRightRegistered"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="24dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    android:visibility="invisible"
    app:srcCompat="@drawable/all_right_registered" />

I using motion layout by the way it has 3 constraints

this is my design in the first constraint, I set the button to invisible in the second one, it will be visible and after click the button it goes to the third one and the video will be play and button will be invisible and I want one image and two buttons to be displayed after some time of clicking the button

Answer 1

To run a long-delayed job, use a Timer instead of Handler :

public class MainActivity extends AppCompatActivity {

    private Button button;
    private ImageView imageView1;
    private Button button1;
    private Button button2;

    private TimerTask timerTask;
    private Timer timer;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button = findViewById(R.id.button);
        imageView1 = findViewById(R.id.imageView1);
        button1 = findViewById(R.id.button1);
        button2 = findViewById(R.id.button2);

        imageView1.setVisibility(View.GONE);
        button1.setVisibility(View.GONE);
        button2.setVisibility(View.GONE);

        timerTask = new TimerTask() {
            public void run() {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        imageView1.setVisibility(View.VISIBLE);
                        button1.setVisibility(View.VISIBLE);
                        button2.setVisibility(View.VISIBLE);
                    }
                });
            }
        };

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (timer != null) {
                    timer.cancel();
                }
                timer = new Timer();
                timer.schedule(timerTask, 26000);
            }
        });
    }

    @Override
    protected void onStop() {
        super.onStop();
        timer.cancel();
    }
}