Android自定义长按事件
2010-12-18 08:04:14 来源:WEB开发网if(Math.abs(mLastMotionX-x) > TOUCH_SLOP
|| Math.abs(mLastMotionY-y) > TOUCH_SLOP) {
//移动超过阈值,则表示移动了
isMoved = true;
}
break;
case MotionEvent.ACTION_UP:
//释放了
isReleased = true;
break;
}
return true;
}
}
代码里注释的比较清楚。主要思路是在down的时候,让一个Runnable一段时间后执行,如果时间到了,没有移动超过定义的阈值,也没有释放,则触发长按事件。在真实环境中,当长按触发之后,还需要将后来的move和up事件屏蔽掉。此处是示例,就略去了。
下面讲讲第二种方式:
Java代码
package chroya.fun;
import android.content.Context;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
public class LongPressView2 extends View{
private int mLastMotionX, mLastMotionY;
//是否移动了
private boolean isMoved;
//长按的runnable
private Runnable mLongPressRunnable;
//移动的阈值
private static final int TOUCH_SLOP = 20;
public LongPressView2(Context context) {
super(context);
mLongPressRunnable = new Runnable() {
@Override
public void run() {
performLongClick();
}
};
}
public boolean dispatchTouchEvent(MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
switch(event.getAction()) {
case MotionEvent.ACTION_DOWN:
mLastMotionX = x;
mLastMotionY = y;
isMoved = false;
postDelayed(mLongPressRunnable, ViewConfiguration.getLongPressTimeout());
break;
case MotionEvent.ACTION_MOVE:
if(isMoved) break;
if(Math.abs(mLastMotionX-x) > TOUCH_SLOP
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