Android自定義長按事件

Android系統自帶了長按事件，setOnLongClickListener即可監聽。但是有時候，你不希望用系統的長按事件，比如當希望長按的時間更長一點的時候。這時候就需要自己來定義這個長按事件了。 

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;  

    //是否移動了  

    private boolean isMoved;  

    //是否釋放了  

    private boolean isReleased;  

    //計數器，防止多次點擊導致最后一次形成longpress的時間變短  

    private int mCounter;  

    //長按的runnable  

    private Runnable mLongPressRunnable;  

    //移動的閾值  

    private static final int TOUCH_SLOP = 20;  

   

    public LongPressView1(Context context) {  

        super(context);  

        mLongPressRunnable = new Runnable() {  

                

            @Override 

            public void run() {  

                mCounter--;  

                //計數器大於0，說明當前執行的Runnable不是最后一次down產生的。  

                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) {  

                //移動超過閾值，則表示移動了  

                isMoved = true;  

            }  

            break;  

        case MotionEvent.ACTION_UP:  

            //釋放了  

            isReleased = true;  

            break;  

        }  

        return true;  

    }  

}