android - 如何在任何 Activity 中禁用虚拟主页按钮？

Question

我需要在我的应用程序的任何 Activity 中禁用 3 个虚拟按钮。我以某种方式禁用了后退按钮和多任务按钮，但我无法启用主页按钮。

我在 stackoverflow 上尝试了 onAttachedToWindow() 风格的答案，但它们对我不起作用。

我不想为整个应用禁用主页按钮，我只想为单个 Activity 窗口禁用它。感谢您的帮助!

Answer 1

注意:如果您想部署应用，我强烈建议您不要在您的应用中执行此操作。这只是为了展示我们如何做到这一点。

自 Android 4 以来，没有有效的方法来禁用主页按钮。它需要一点技巧。我认为您需要的是应用程序中的 KIOSK 模式。一般来说，这个想法是检测新应用程序何时在前台运行并立即重启您的 Activity。过程如下..

首先创建一个名为 KioskService 的类来扩展 Service 并添加以下代码 fragment :

 public class KioskService extends Service {

  private static final long INTERVAL = TimeUnit.SECONDS.toMillis(2); // periodic interval to check in seconds -> 2 seconds
  private static final String TAG = KioskService.class.getSimpleName();
  private static final String PREF_KIOSK_MODE = "pref_kiosk_mode";

  private Thread t = null;
  private Context ctx = null;
  private boolean running = false;

  @Override
  public void onDestroy() {
    Log.i(TAG, "Stopping service 'KioskService'");
    running =false;
    super.onDestroy();
  }

  @Override
  public int onStartCommand(Intent intent, int flags, int startId) {
    Log.i(TAG, "Starting service 'KioskService'");
    running = true;
    ctx = this;

    // start a thread that periodically checks if your app is in the foreground
    t = new Thread(new Runnable() {
      @Override
      public void run() {
        do {
          handleKioskMode();
          try {
            Thread.sleep(INTERVAL);
          } catch (InterruptedException e) {
            Log.i(TAG, "Thread interrupted: 'KioskService'");
          }
        }while(running);
        stopSelf();
      }
    });

    t.start();
    return Service.START_NOT_STICKY;
  }

  private void handleKioskMode() {
    // is Kiosk Mode active? 
      if(isKioskModeActive()) {
        // is App in background?
      if(isInBackground()) {
        restoreApp(); // restore!
      }
    }
  }

  private boolean isInBackground() {
    ActivityManager am = (ActivityManager) ctx.getSystemService(Context.ACTIVITY_SERVICE);

    List<ActivityManager.RunningTaskInfo> taskInfo = am.getRunningTasks(1);
    ComponentName componentInfo = taskInfo.get(0).topActivity;
    return (!ctx.getApplicationContext().getPackageName().equals(componentInfo.getPackageName()));
  }

  private void restoreApp() {
    // Restart activity
    Intent i = new Intent(ctx, MyActivity.class);
    i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    ctx.startActivity(i);
  }

  public boolean isKioskModeActive(final Context context) {
    SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);
    return sp.getBoolean(PREF_KIOSK_MODE, false);
  }

  @Override
  public IBinder onBind(Intent intent) {
    return null;
  }
}

在您的 AppContext 类中添加以下方法，以通过创建应用程序上下文来启动服务。

@Override
public void onCreate() {
  super.onCreate();
  instance = this;
  registerKioskModeScreenOffReceiver();
  startKioskService();  // add this
}

private void startKioskService() { // ... and this method
  startService(new Intent(this, KioskService.class));
}

你的 AppContext 类看起来像这样

  public class AppContext extends Application {

  private AppContext instance;
  private PowerManager.WakeLock wakeLock;
  private OnScreenOffReceiver onScreenOffReceiver;


  @Override
  public void onCreate() {
    super.onCreate();
    instance = this;
    registerKioskModeScreenOffReceiver();
  }

  private void registerKioskModeScreenOffReceiver() {
    // register screen off receiver
    final IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
    onScreenOffReceiver = new OnScreenOffReceiver();
    registerReceiver(onScreenOffReceiver, filter);
  }

  public PowerManager.WakeLock getWakeLock() {
    if(wakeLock == null) {
      // lazy loading: first call, create wakeLock via PowerManager.
      PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
      wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, "wakeup");
    }
    return wakeLock;
  }
}

在 list 中添加服务声明和获取前台进程的权限:

<service android:name=".KioskService" android:exported="false"/>
<uses-permission android:name="android.permission.GET_TASKS"/>
//Added permission Edit 1
<uses-permission android:name="android.permission.WAKE_LOCK" />

我在一个站点上看到了所有内容，但忘记了链接，我所拥有的只是内容和代码，因此我将所有内容作为答案发布。获得链接后，我会立即与您分享。