Android(安卓)返回键连续点击两次退出应用

返回键连续点击两次退出应用，一般大家都是使用时间差来实现功能，现在推荐使用handler来实现，看代码

使用工具类DoubleClickExitHelper

public class DoubleClickExitHelper {private final Activity mActivity;private boolean isOnKeyBacking;private Handler mHandler;private Toast mBackToast;public DoubleClickExitHelper(Activity activity) {mActivity = activity;mHandler = new Handler(Looper.getMainLooper());}/** * Activity onKeyDown事件 * */public boolean onKeyDown(int keyCode, KeyEvent event) {if(keyCode != KeyEvent.KEYCODE_BACK) {return false;}if(isOnKeyBacking) {mHandler.removeCallbacks(onBackTimeRunnable);if(mBackToast != null){mBackToast.cancel();}mActivity.finish();return true;} else {isOnKeyBacking = true;if(mBackToast == null) {mBackToast = Toast.makeText(mActivity, "再按一次返回", 2000);}mBackToast.show();//延迟两秒的时间，把Runable发出去mHandler.postDelayed(onBackTimeRunnable, 2000);return true;}}private Runnable onBackTimeRunnable = new Runnable() {@Overridepublic void run() {isOnKeyBacking = false;if(mBackToast != null){mBackToast.cancel();}}};}

接下来我们只需要在回调onKeyDown中加入该工具方法即可，当然使用前要初始化下

DoubleClickExitHelper doubleClick = new DoubleClickExitHelper(this);

接下来重写onKeyDown:

/** * Returns:  * Return * true to prevent this event from being propagated further, or false to * indicate that you have not handled this event and it should continue to * be propagated. */@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {return doubleClick.onKeyDown(keyCode, event);}return super.onKeyDown(keyCode, event);}

完成，方便简单

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