點擊後退按鈕後，飛濺屏幕活動不會中止

Question

這是我的代碼。當我點擊後退按鈕漂亮simple..But，出現的第二個活動..

public class MainActivity extends ActionBarActivity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    Thread t = new Thread(){ 
     public void run(){ 
      try{ 
       sleep(3000); 

      } catch (InterruptedException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      }finally{ 
       Intent i = new Intent(MainActivity.this,SecondActivity.class); 
       startActivity(i); 
      } 
     } 
    }; 
    t.start(); 
} 

@Override 
protected void onPause() { 
    // TODO Auto-generated method stub 
    super.onPause(); 
    this.finish(); 
    } 

} 

我也把清單文件，但再次我仍然有同樣的問題..

 android:noHistory="true" 

Answer 1

使用Handler這樣製作Splash屏幕

private static final int SPLASH_TIME_OUT = 3000; 
    private Handler mHandler = new Handler(); 
    private Runnable mRunnable; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     setContentView(R.layout.activity_main); 
     mRunnable = new Runnable() { 

      @Override 
      public void run() { 
       openLandingActivity(); 
      } 
     }; 
     mHandler.postDelayed(mRunnable, SPLASH_TIME_OUT);// 
    } 

    protected void openLandingActivity() { 
     // TODO Auto-generated method stub 
     Intent intent = new Intent(MainActivity.this,SecondActivity.class); 
     startActivity(intent); 
     finish(); 
    } 

    @Override 
    public boolean onKeyDown(int keyCode, KeyEvent event) { 
     // TODO Auto-generated method stub 
     if(keyCode == KeyEvent.KEYCODE_BACK) { 
      mHandler.removeCallbacks(mRunnable); 
      finish(); 
     } 
     return super.onKeyDown(keyCode, event); 
    } 

Answer 2

} finally { 
    Intent intent = new Intent(); 
    intent.setClass(SplashActivity.this, MainActivity.class); 
    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
    startActivityForResult(intent, 0); 
    finish(); 
} 

Answer 3

試試這個希望它會幫助你..

private final int SPLASH_DISPLAY_LENGHT = 5000; 

/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle icicle) 
{ 
    super.onCreate(icicle); 
    setContentView(R.layout.activity_main); 
    /* New Handler to start the Menu-Activity 
    * and close this Splash-Screen after some seconds.*/ 
    new Handler().postDelayed(new Runnable(){ 
     @Override 
     public void run() { 
      /* Create an Intent that will start the Menu-Activity. */ 
      Intent i = new Intent(MainActivity.this,SecondActivity.class); 
      startActivity(i); 
      splash.this.finish(); 
     } 
    }, SPLASH_DISPLAY_LENGHT); 
} 

}

Answer 4

我不得不使用的onkeydown（）方法，這使得該問題，以disappear..Here是固定代碼..

public class MainActivity extends ActionBarActivity { 
    private boolean isBackPressed = false; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    Thread t = new Thread(){ 
     public void run(){ 
      try{ 
       sleep(3000); 

      } catch (InterruptedException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      }finally{ 
       if(!isBackPressed){ 
       Intent i = new Intent(MainActivity.this,SecondActivity.class); 
       startActivity(i); 

       } 
      } 
     } 
    }; 
    t.start(); 
} 


@Override 
public boolean onKeyDown(int keyCode, KeyEvent event) { 
    if ((keyCode == KeyEvent.KEYCODE_BACK)) { 
     isBackPressed = true; 
     finish(); 
    } 
    return super.onKeyDown(keyCode, event); 

} 

} 

Answer 5

我建議你切換到該doInBackground期間休眠3秒的的AsyncTask（）並開始新的活動+殺死onPostExecute（）中的當前行爲，但僅當isCancelled（）不正確時纔會執行。

然後覆蓋你濺活動onBackPressed（）和：

1. 取消當前的異步任務（保持在一個局部變量的引用）。
2. 完成當前活動。

這樣AsyncTask仍然會在後臺睡3秒，但是當它的onPostExecute（）出現時，它會通過檢查isCancelled（）來知道它被取消，而不是啓動第二個活動。

參見：AsyncTask documentation