Question

我目前正在使用自定义AlertDialog，它在Activity中有一个Theme.Dialog主题，要求用户输入当前密码才能继续。

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

活动 - 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

McAfee Wave Secure通过以下方式完成此操作：它们运行后台服务，如果您的屏幕处于活动状态，则每隔几秒检查一次。如果不是服务重新启动您的活动或将其带到前面（使其激活）。在onPause中，您可以保存输入数据，以便在重新启动活动时重新加载它。

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);
}

我做了“FLAG_ACTIVITY_NEW_TASK”，因为我已经获得了相同活动的许多实例。也许有办法让它变得活跃。

示例“PSEUDO”

{
    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 2

尝试覆盖onPause（）方法，以便当按下主页按钮时活动不会停止

Answer 3

尝试覆盖您希望禁用HOME按钮的Activity类的onKeyDown方法。在此方法中，检查用户是否按下了HOME按钮。

阻止HOME按钮关闭活动

3 个答案: