android实现双击监听

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方案的优势：

1.灵活性高。不需要继承自View或者其子类。

2.对单击的误触进行了识别。

3.本身已经具备了双击，单击的识别机制，不必担心与原有接口的协调问题。

4.可调整单击与双击识别的时间值。

用法：

1.实例化VulcanTouchProcessor类。设置合适的监听器，以及双击的时间（单位毫秒)

2.在你的View(或者子类)的onTouch回调中调用VulcanTouchProcessor的notifyTouchUp方法

3.当双击事件触发，上述设定的监听器会被调用。

用法示例代码(其中的mTouchProcessor需要先行实例化)：

        view.setOnTouchListener(new View.OnTouchListener() {            @Override            public boolean onTouch(View v, MotionEvent event) {                if(MotionEvent.ACTION_UP == event.getAction()) {                    mTouchProcessor.notifyTouchUp(v,null);                }                return true;            }        });

功能实现代码如下：

package com.vulcan.vulcan;import android.os.Handler;import android.os.Looper;import android.view.View;/** * Created by vulcan on 2016/12/30. */public class VulcanTouchProcessor {    public static final int STATUS_READY = 0;    public static final int STATUS_GOING_TO_DOUBLE = 1;    public static final int STATUS_SLEEP = 2;//in sleep status, we do not process any key.    public static final long DEFAULT_DOUBLE_TAP_TIME_MS = 300;    public VulcanTouchProcessor(VulcanTouchListener l) {        mTouchListener = l;    }    public VulcanTouchProcessor(VulcanTouchListener l, long doubleTapTimeMs) {        this(l);        mTimeMsOfDoubleTap = doubleTapTimeMs;    }    public boolean notifyTouchUp(View v, Object extra) {        mLastTouchedView = v;        mExtraObject = extra;        if(STATUS_READY == mStatus) {            mStatus = STATUS_GOING_TO_DOUBLE;            setTimer(mTimeMsOfDoubleTap);            return true;        }        else if(STATUS_GOING_TO_DOUBLE == mStatus) {            mStatus = STATUS_SLEEP;            setTimer(mTimeMsOfSleep);            mTouchListener.onDoubleClick(v, extra);            return true;        }        else if(STATUS_SLEEP == mStatus) {            return true;        }        return true;    }    private void notifyTimeout() {        if(STATUS_READY == mStatus) {            cancelTimer();        }        else if(STATUS_GOING_TO_DOUBLE == mStatus) {            mTouchListener.onSingleClick(mLastTouchedView, mExtraObject);            setTimer(mTimeMsOfSleep);            mStatus = STATUS_SLEEP;        }        else if(STATUS_SLEEP == mStatus) {            cancelTimer();            mStatus = STATUS_READY;        }        return;    }    private void setTimer(long delayMs) {        mHandler.removeCallbacks(mTimeoutCallback);        mHandler.postDelayed(mTimeoutCallback, delayMs);    }    private void cancelTimer() {        mHandler.removeCallbacks(mTimeoutCallback);    }    private Runnable mTimeoutCallback = new Runnable() {        @Override        public void run() {            notifyTimeout();        }    };    private long mTimeMsOfSleep = 250;    private long mTimeMsOfDoubleTap = DEFAULT_DOUBLE_TAP_TIME_MS;    private Object mExtraObject;    private View mLastTouchedView;    private int mStatus = STATUS_READY;    private VulcanTouchListener mTouchListener;    private Handler mHandler = new Handler(Looper.getMainLooper());}

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