Android 双击返回键退出应用程序

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前言

需要实现类似于主流的退出功能，连续按两次返回键退出应用程序。

方案

先上代码：

import android.app.Activity;import android.os.Handler;import android.os.Looper;import android.view.KeyEvent;import android.widget.Toast;/** * 双击退出 *  * @author wxm *  */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) {}mHandler.postDelayed(onBackTimeRunnable, 2000);return true;}}private Runnable onBackTimeRunnable = new Runnable() {@Overridepublic void run() {isOnKeyBacking = false;if (mBackToast != null) {mBackToast.cancel();}}};}

然后调用方法：

private DoubleClickExitHelper doubleClickExitHelper;@Overrideprotected void onCreate(Bundle savedInstanceState) {doubleClickExitHelper = new DoubleClickExitHelper(this);}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK&& event.getAction() == KeyEvent.ACTION_DOWN) {Toast.makeText(this, getString(R.string.back_exit_tips),Toast.LENGTH_SHORT).show();return doubleClickExitHelper.onKeyDown(keyCode, event);}return true;}

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