android：自定义长按/长点击事件

自定义的长按事件。

public class LongPressView extends View{private static final String TAG = "LongPressView";private int mLastMotionX, mLastMotionY;private boolean isMoved;//长按的runnableprivate Runnable mLongPressRunnable;//移动的阈值private static final int TOUCH_SLOP = 20;public LongPressView(final Context context) {super(context);mLongPressRunnable = new Runnable() {@Overridepublic void run() {Log.i(TAG, "mLongPressRunnable excuted");performLongClick();// 执行长按事件（如果有定义的话）}};}/* *  * 1）在down的时候，让一个Runnable在设定时间后执行， *      如果设定时间到了，没有移动超过定义的阈值，也没有释放，则触发长按事件 *  * 2）在移动超过阈值和释放之后，会将Runnable从事件队列中remove掉，长按事件也就不会再触发了 *  */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;/* * 将mLongPressRunnable放进任务队列中，到达设定时间后开始执行 * 这里的长按时间采用系统标准长按时间 */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;removeCallbacks(mLongPressRunnable);}break;case MotionEvent.ACTION_UP://释放了removeCallbacks(mLongPressRunnable);break;}return true;}}

Activity调用。

public class MainActivity extends Activity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);                View mLongPressView = new LongPressView(this);        mLongPressView.setOnLongClickListener(new OnLongClickListener() {@Overridepublic boolean onLongClick(View v) {Toast.makeText(MainActivity.this,"I got a long press!", Toast.LENGTH_SHORT).show();return false;}});        setContentView(mLongPressView);    }}

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