Android App中连续点击Back键退出应用，androidapp,现在的App就用越来越人

Android App中连续点击Back键退出应用，androidapp,现在的App就用越来越人

现在的App就用越来越人性化了，为了满足用户的体验欲望，从各个方面都进行了仔细处理。比如我们点击第一次点击Back键的时候，会温馨提示“再按一次返回键退出应用”等，今天 就记录下自己在项目中写的这个小功能：

首先写个工具类：

public class DoubleClickExitApp {   private Context mcontext;   /**是否是再次点击back键*/   private boolean isOnKeyBack;   private Handler mHandler;   /**退出提示Toast*/   private Toast mExitToast;   public DoubleClickExitApp(Context context) {      this.mcontext = context;      this.mHandler = new Handler(Looper.getMainLooper());   }   /**所在Activity中的点击返回事件处理*/   public boolean onKeyDown(int keyCode, KeyEvent event) {      if(keyCode != KeyEvent.KEYCODE_BACK) {//如果不是点击的返回键，则返回false         return false;      }      if(isOnKeyBack) {         mHandler.removeCallbacks(onBackExitRunnable);         if(mExitToast != null){            mExitToast.cancel();         }         /**直接退出*/         AppManager.getAppManager().AppExit(mcontext);         return true;      } else {         isOnKeyBack = true;         if(mExitToast == null) {            mExitToast = Toast.makeText(mcontext, "再按一次返回键退出应用", Toast.LENGTH_SHORT);         }         mExitToast.show();         mHandler.postDelayed(onBackExitRunnable, 2000);         return true;      }   }   private Runnable onBackExitRunnable = new Runnable() {      @Override      public void run() {         isOnKeyBack = false;         if(mExitToast != null){            mExitToast.cancel();         }      }   };}

然后在对应的Activity或是主页面中直接调用：``````javapublic class MainActivity extends Activity{     private DoubleClickExitApp mDoubleClickExitApp;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);         mDoubleClickExitApp = new DoubleClickExitApp(this);    }    @Override    protected void onDestroy() {        super.onDestroy();    }   /**在处理onKeyDown事件中调用我们写的工具类方法就可以*/    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        if (keyCode == KeyEvent.KEYCODE_BACK) {               return mDoubleClickExitApp.onKeyDown(keyCode, event);        }else{          return super.onKeyDown(keyCode, event);       }    }