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);
- }
- }
来源: http://www.phpxs.com/code/1001843/