防止HOME按钮关闭活动

Question

我目前正在使用一个自定义AlertDialog，它有一个Activity中的Theme.Dialog主题，要求用户键入当前密码才能继续。

根据Android - Is It possible to disable the click of home button我已经尝试了大多数方法，但它不起作用。

活动 - 的onCreate

 SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(PhysicalTheftDialog.this); 

     boolean isServerRunning = sp.getBoolean("isServerRunning", false); 
      if (isServerRunning == false) { 
       startService(new Intent(PhysicalTheftDialog.this, MyService.class)); 

      } 
      else { 
       sp.getBoolean("isServerRunning", true); 
      } 

服务

@Override 
    public void onCreate() { 
/*  //Toast.makeText(this, "My Service Created", Toast.LENGTH_LONG).show(); 
     Log.d(TAG, "onCreate"); 

     player = MediaPlayer.create(this, R.raw.braincandy); 
     player.setOnPreparedListener(this); 
     try { 
      player.prepareAsync(); 

     } catch (Exception e) { 
      Log.e(TAG, "", e); 
     } 
     player.setLooping(true); // Set looping*/ 
     this.context = getApplicationContext(); 
     //Toast.makeText(this, "My Service Created", Toast.LENGTH_LONG).show(); 
     SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(this); 
     boolean isServerRunning = sp.getBoolean("isServerRunning", true); 

     while (!isServerRunning) { 
      // THAT CODE: check if activity is on the top 
      Handler handler = new Handler(); 

      handler.postDelayed(new Runnable() { 
       public void run() { 

         // get a list of running processes and iterate through them 
         ActivityManager activityManager = (ActivityManager)context.getSystemService(Activity.ACTIVITY_SERVICE); 

         // get the info from the currently running task 
         List<ActivityManager.RunningTaskInfo> taskInfo = activityManager.getRunningTasks(1); 
         ComponentName componentInfo = taskInfo.get(0).topActivity; 

         // if top activity is not "MyActivity" activity, then launch it 
         if("nyp.android.project".equals(componentInfo.getClassName()) == false) { 
          Intent intent = new Intent(MyService.this, PhysicalTheftDialog.class); 
          intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
          startActivity(intent); 
} 
       } 
      }, 2000); 

      boolean serviceStatus = sp.getBoolean("isServerRunning", false); 
     } 
    } 

logcat的

E/AndroidRuntime(9799): FATAL EXCEPTION: main 
E/AndroidRuntime(9799): java.lang.RuntimeException: Unable to start service nyp.android.project.MyService@41b29ff0 with Intent { cmp=xxxx }: java.lang.NullPointerException 
E/AndroidRuntime(9799): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2387) 
E/AndroidRuntime(9799): at android.app.ActivityThread.access$1900(ActivityThread.java:127) 
E/AndroidRuntime(9799): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1221) 
E/AndroidRuntime(9799): at android.os.Handler.dispatchMessage(Handler.java:99) 
E/AndroidRuntime(9799): at android.os.Looper.loop(Looper.java:137) 
E/AndroidRuntime(9799): at android.app.ActivityThread.main(ActivityThread.java:4511) 
E/AndroidRuntime(9799): at java.lang.reflect.Method.invokeNative(Native Method) 
E/AndroidRuntime(9799): at java.lang.reflect.Method.invoke(Method.java:511) 
E/AndroidRuntime(9799): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980) 
E/AndroidRuntime(9799): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747) 
E/AndroidRuntime(9799): at dalvik.system.NativeStart.main(Native Method) 
E/AndroidRuntime(9799): Caused by: java.lang.NullPointerException 
E/AndroidRuntime(9799): at nyp.android.project.MyService.onStart(MyService.java:95) 
E/AndroidRuntime(9799): at android.app.Service.onStartCommand(Service.java:438) 
E/AndroidRuntime(9799): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2370) 
E/AndroidRuntime(9799): ... 10 more 

Answer 1

尝试overiding的的onPause（）方法，这样的活动不会停止home键按下呼叫时它

Answer 2

从我看到的McAfee Wave Secure做了以下方法。他们运行一个后台服务，每隔几秒钟检查一次您的屏幕是否处于活动状态如果没有服务，请重新启动您的活动或将其带到前面（使其处于活动状态）。在onPause中，您可以保存输入数据以在活动重新启动时重新加载它。

我的例子：

// get a list of running processes and iterate through them 
ActivityManager activityManager = (ActivityManager)_context 
     .getSystemService(Activity.ACTIVITY_SERVICE); 

// get the info from the currently running task 
List<ActivityManager.RunningTaskInfo> taskInfo = activityManager.getRunningTasks(1); 
ComponentName componentInfo = taskInfo.get(0).topActivity; 

// if top activity is not "MyActivity" activity, then launch it 
if(componentInfo.getClassName().equals("com.namespace.MyActivity") == false) { 
    Intent intent = new Intent(context, MyActivity.class); 
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
    context.startActivity(intent); 
} 

我愿意 “FLAG_ACTIVITY_NEW_TASK” 因为I`ve已经得到同样的活动的许多实例。也许有一种方法可以使它活跃起来。

例“伪”

{ 
    Activity: 
    preference isServerRunning = getPreference("isServerRunning"); 
    if (serviceIsRunning == false) { 
     runService(); 
    } 
    // othervise, service is running and will do the job 
    Onclick.UserLogged() { 
     setPreference("isUserLoged", true); 
    } 

    Service: 
    while (!userIsLogged) { 
     // THAT CODE: check if activity is on the top 

     sleepFor2seconds(); 
     userIsLogger = getPreference("isUserLogged"); 
    } 

} 

Answer 3

尝试重写的方法OnKeyDown您的活动类，其中u要禁用HOME按钮。在这种方法中，检查用户是否按下了HOME按钮。