java - 处理 onClick 和双击

Question

我有一个类似于 Whatsapp 的消息应用程序，其中聊天 Activity 中有消息视频和图像。现在我想对此实现类似双击的功能，但问题是我还附加了一个onclicklistner到我的图像和视频帧，它打开了显示图像的全屏 Activity 全屏或全屏播放视频。因此，双击时，它不会点赞图片或视频，而是以全屏模式打开视频或图像。因为在消息中我没有附加双击监听器，所以工作正常。关于如何在视频或图像的情况下双击类似工作的任何想法。我对使用 Java 进行 Android 开发相当陌生。因此，我们非常感谢任何帮助。

Answer 1

HI, I think the approach to take depends on the future of your app, using LongClick is kinda good but what if you want to achieve a zoom like onLongClick?

What I did below is that I created a subclass that extends GestureDetector.SimpleOnGestureListener and then in my GestureTest class, I an ontouchListener and return the gesture instance created before, finally I parse the listener to the button that has to perform the clicks, it can be any View object. Finally, I used the TextView I created to display/monitor my actions.

GestureDetector 如下所示:

public class GestureTest extends AppCompatActivity{

    private Button btn;
    private TextView actions;
    private GestureDetector mDetector;

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

        btn = findViewById(R.id.btn);
        actions = findViewById(R.id.action);

        mDetector = new GestureDetector(this, new SampleGestureListener());
        View.OnTouchListener touchListener = new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                return mDetector.onTouchEvent(event);
            }
        };

        btn.setOnTouchListener(touchListener);
    }

    public class SampleGestureListener extends GestureDetector.SimpleOnGestureListener{

            @Override
            public boolean onDown(MotionEvent event) {
                Log.e("EVENT","BUTTON PRESSED DOWN, NOT YET RELEASED WILL TRIGGER ONLONG-PRESS");

                // don't return false here or else none of the other
                // gestures will work
                return true;
            }

            @Override
            public boolean onSingleTapConfirmed(MotionEvent e) {
                Log.e("EVENT", "SINGLE CLICK EVENT");
                actions.setText("THIS CLICK IS FOR IMAGE OR VIDEO TO OPEN ?");
                return true;
            }

            @Override
            public void onLongPress(MotionEvent e) {
                Log.e("EVENT", "LONG PRESSED");
                actions.setText("THIS IS ZOOM LIKE NOT DOUBLE CLICK!!!");
            }

            @Override
            public boolean onDoubleTap(MotionEvent e) {
                Log.e("EVENT", "DOUBLE CLICKED HAPPENED");
                actions.setText("THIS CLICK IS TO LIKE IMAGE OR VIDEO ?");
                return true;
            }

            @Override
            public boolean onScroll(MotionEvent e1, MotionEvent e2,
                                    float distanceX, float distanceY) {
                Log.e("EVENT", "SCROLLING");
                actions.setText("YOU\" Scrolling on many images...");
                return true;
            }

            @Override
            public boolean onFling(MotionEvent event1, MotionEvent event2,
                                   float velocityX, float velocityY) {
                Log.e("EVENT", "FLINGED");
                actions.setText("THIS IS TINDER FLING LIKE ?");
                return true;
            }
        }
}

AND BELOW IS MY activity_gesture_test.xml FOR TESTING:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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">

    <Button
        android:id="@+id/btn"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_width="match_parent"
        android:layout_height="100dp"/>

    <TextView
        android:id="@+id/action"
        android:textSize="20dp"
        android:textColor="@color/black"
        app:layout_constraintTop_toBottomOf="@+id/btn"
        android:layout_width="match_parent"
        android:layout_height="100dp"/>

</androidx.constraintlayout.widget.ConstraintLayout>

GoodLuck Coding.