App中连续点击Back键退出应用
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:
public 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);}
}
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