Question

我有两个TextView，我想仅为setOnTouchListener设置TextView。我找到了this SO answer并按照这个答案的说明做了那个，但我无法解决问题。我正在使用GestureDetectorCompat。我尝试了很多解决方案，但问题仍然存在。

当我触摸textview1时，onFling方法会从注册onTouch侦听器调用，但当我触摸textview2时，onFling方法仍然是从life cycle method开始调用。我没有理解为什么它在未注册的textview上调用onFling。请帮帮我。

acticity_main.xml

<TextView
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:background="#ffcc99"
        android:id="@+id/textview1"
        android:layout_margin="20dp"
        android:text="Hello World!" />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:layout_gravity="bottom"
        android:background="#ffcc88"
        android:id="@+id/textview2"
        android:text="Hello World!" />

MainActivity.java

import android.graphics.Path;
import android.os.Bundle;
import android.support.v4.view.GestureDetectorCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements GestureDetector.OnGestureListener {

    private static String DEBUG_TAG = "debug";
    private TextView mTextView;
    private GestureDetectorCompat mGestureDetector;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mGestureDetector = new GestureDetectorCompat(this,this);
        findViewById(R.id.textview1).setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, final MotionEvent event) {
                Log.e(DEBUG_TAG, "setOnTouchListener");
                mGestureDetector.onTouchEvent(event);
                return true;
            }
        });

    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        Log.e(DEBUG_TAG, "onTouchEvent");
        mGestureDetector.onTouchEvent(event);

        return super.onTouchEvent(event);
    }


    @Override
    public boolean onDown(MotionEvent e) {
        Log.e(DEBUG_TAG, "onDown");
        return false;
    }

    @Override
    public void onShowPress(MotionEvent e) {
        Log.e(DEBUG_TAG, "onShowPress");
    }

    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        Log.e(DEBUG_TAG, "onSingleTapUp");
        return false;
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
        Log.e(DEBUG_TAG, "onScroll");
        return false;
    }

    @Override
    public void onLongPress(MotionEvent e) {
        Log.e(DEBUG_TAG, "onLongPress");
    }
@Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        Log.e(DEBUG_TAG, "onFling " + e1.getX() + " - " + e2.getX());
}
}

Answer 1

请移除onTouchEvent之外的onCreate方法，然后该方法仅适用于textview1。由于您已在onTouchEvent之外应用了onCreate，因此只要整个MainActivity出现手势事件，就会调用onTouchEvent，因为onCreate外的mGestureDetector.onTouchEvent(event)也在调用mGestureDetector.onTouchEvent(event);

声明

GestureDetectorCompact

自动调用OnGestureListener来电的onTouchEvent，它确实会根据动作事件进行{{1}}提供的相应回调。

使用GestureDetectorCompat

1 个答案: