Android自定义长按事件

Android系统自带了长按事件，setOnLongClickListener即可监听。但是有时候，你不希望用系统的长按事件，比如当希望长按的时间更长一点的时候。这时候就需要自己来定义这个长按事件了。 

package chroya.fun;  

   

import android.content.Context;  

import android.view.MotionEvent;  

import android.view.View;  

import android.view.ViewConfiguration;  

   

public class LongPressView1 extends View{  

    private int mLastMotionX, mLastMotionY;  

    //是否移动了  

    private boolean isMoved;  

    //是否释放了  

    private boolean isReleased;  

    //计数器，防止多次点击导致最后一次形成longpress的时间变短  

    private int mCounter;  

    //长按的runnable  

    private Runnable mLongPressRunnable;  

    //移动的阈值  

    private static final int TOUCH_SLOP = 20;  

   

    public LongPressView1(Context context) {  

        super(context);  

        mLongPressRunnable = new Runnable() {  

                

            @Override 

            public void run() {  

                mCounter--;  

                //计数器大于0，说明当前执行的Runnable不是最后一次down产生的。  

                if(mCounter>0 || isReleased || isMoved) return;  

                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;  

            mCounter++;  

            isReleased = false;  

            isMoved = false;  

            postDelayed(mLongPressRunnable, ViewConfiguration.getLongPressTimeout());  

            break;  

        case MotionEvent.ACTION_MOVE:  

            if(isMoved) break;  

            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;  

    }  

}