在SCREEN_OFF意圖調用時調用的活動（生命週期）的奇怪行爲

Question

我正在開發幻燈片功能，此停止和重新啓動在幻燈片流中創建問題，我們可以更改它嗎？

日誌的生命週期方法

07-04 22:47:27.944: D/ReceiverActivity(7365): Activity Life cycle - onStart called 
07-04 22:47:27.944: D/ReceiverActivity(7365): Activity Life cycle - onResume called 
07-04 22:47:28.467: D/ReceiverActivity(7365): Activity Life cycle - onStop called 
07-04 22:47:29.139: D/ReceiverActivity(7365): Activity Life cycle - onRestart called 
07-04 22:47:29.139: D/ReceiverActivity(7365): Activity Life cycle - onStart called 
07-04 22:47:29.139: D/ReceiverActivity(7365): Activity Life cycle - onResume called 

這裏是我的應用程序代碼片段提前

@Override 
public void onReceive(final Context context, final Intent intent) { 
    if(action.equals(Intent.ACTION_SCREEN_OFF)) { 
     Intent ri = new Intent(context, ReceiverActivity.class); 
      ri.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
      context.startActivity(ri); 
    } 
} 


public class ReceiverActivity extends Activity 
{ 
    StringBuilder builder; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 

     Window win = getWindow(); 
     win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED 
       | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD); 
     // Turn on the screen unless we are being launched from the AlarmAlert 
     // subclass as a result of the screen turning off. 
     win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON 
       | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON); 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.launcher_layout); 
     builder = new StringBuilder(); 
     builder.append("onCreate called."); 
     Log.e("ReceiverActivity", "String : " + builder.toString()); 
    } 

    @Override 
    protected void onStart() { 
     Log.d("ReceiverActivity","Activity Life cycle - onStart called"); 
     super.onStart(); 
     builder.append("\nonStart called."); 
    } 

    @Override 
    protected void onResume() { 
     Log.d("ReceiverActivity","Activity Life cycle - onResume called"); 
     super.onResume(); 
     builder.append("\nonResume called."); 
     Log.e("ReceiverActivity", "String : " + builder.toString()); 
     ((TextView) findViewById(R.id.textView1)).setText(builder.toString()); 
    } 
    @Override 
    protected void onRestart() { 
     Log.d("ReceiverActivity","Activity Life cycle - onRestart called"); 
     super.onRestart(); 
    } 
    @Override 
    protected void onStop() { 
     Log.d("ReceiverActivity","Activity Life cycle - onStop called"); 
     super.onStop(); 
    } 
} 

感謝

Answer 1

這似乎對我來說，你需要知道，如果屏幕實際上在onResume被調用時打開或關閉，以確定如何處理事件。你想檢查：

• 你的活動是在前臺。
• 屏幕亮起。

Getting if Screen ON/OFF and if Application is in Background/Foreground給出瞭如何做到這兩者的明確答案。