Android GestureDetector手势滑动使用实例讲解
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2021-01-04
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Android GestureDetector手势滑动使用实例讲解手势滑动使用实例讲解
Gesture在在 ViewGroup中使用中使用
GestureDetector类可以让我们快速的处理手势事件，如点击，滑动等。
使用GestureDetector分三步：
1. 定义GestureDetector类
2. 初始化手势类，同时设置手势监听
3. 将touch事件交给gesture处理
先来了解一下如何使用，后面会有示例：
package com.example.y2222.myview;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.widget.LinearLayout;
/**
* Created by raise.yang on 2016/06/29.
*/
public class GestureDemoView extends LinearLayout {
//1,定义GestureDetector类
private GestureDetector m_gestureDetector;
public GestureDemoView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public GestureDemoView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
//设置为可点击
setClickable(true);
//2,初始化手势类，同时设置手势监听
m_gestureDetector = new GestureDetector(context, onGestureListener);
//双击监听-一般很少用到
m_gestureDetector.setOnDoubleTapListener(onDoubleTapListener);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
//3,将touch事件交给gesture处理
m_gestureDetector.onTouchEvent(event);
return super.onTouchEvent(event);
}
//初始化手势监听对象，使用GestureDetector.OnGestureListener的实现抽象类，因为实际开发中好多方法用不上
private final GestureDetector.OnGestureListener onGestureListener = new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent e) {
Log.d("GestureDemoView", "onSingleTapUp() ");
return super.onSingleTapUp(e);
}
@Override
public void onLongPress(MotionEvent e) {
Log.d("GestureDemoView", "onLongPress() ");
super.onLongPress(e);
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
Log.d("GestureDemoView", "onScroll() distanceX = " + distanceX);
return super.onScroll(e1, e2, distanceX, distanceY);
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
Log.d("GestureDemoView", "onFling() velocityX = " + velocityX);
return super.onFling(e1, e2, velocityX, velocityY);
}
@Override
public void onShowPress(MotionEvent e) {
Log.d("GestureDemoView", "onShowPress() ");
super.onShowPress(e);
}
@Override
public boolean onDown(MotionEvent e) {
Log.d("GestureDemoView", "onDown() ");
return super.onDown(e);
}
@Override
public boolean onDoubleTap(MotionEvent e) {
Log.d("GestureDemoView", "onDoubleTap() ");
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