无法禁用主页按钮

Question

我正在尝试禁用主页按钮，但收到一个我不明白的错误。我尝试了许多代码来禁用主页按钮，但没有成功。此代码似乎更好，但此错误使我的应用程序崩溃。当我的应用程序打开并进入 InputPassword Activity 时，它崩溃了。我的 homeLockKey 代码如下：

public class HomeKeyLocker {
private OverlayDialog mOverlayDialog;

public void lock(Activity activity) {
    if (mOverlayDialog == null) {
        mOverlayDialog = new OverlayDialog(activity);
        mOverlayDialog.show();
    }
}

public void unlock() {
    if (mOverlayDialog != null) {
        mOverlayDialog.dismiss();
        mOverlayDialog = null;
    }
}

private static class OverlayDialog extends AlertDialog {

    public OverlayDialog(Activity activity) {
        super(activity, R.style.OverlayDialog);
        WindowManager.LayoutParams params = getWindow().getAttributes();
        params.type = TYPE_SYSTEM_ERROR;
        params.dimAmount = 0.0F; // transparent
        params.width = 0;
        params.height = 0;
        params.gravity = Gravity.BOTTOM;
        getWindow().setAttributes(params);
        getWindow().setFlags(FLAG_SHOW_WHEN_LOCKED | FLAG_NOT_TOUCH_MODAL, 0xffffff);
        setOwnerActivity(activity);
        setCancelable(false);
    }

    public final boolean dispatchTouchEvent(MotionEvent motionevent) {
        return true;
    }

    protected final void onCreate(Bundle bundle) {
        super.onCreate(bundle);
        FrameLayout framelayout = new FrameLayout(getContext());
        framelayout.setBackgroundColor(0);
        setContentView(framelayout);
    }
}

我的活动是：

public class InputPassword extends AppCompatActivity {
  HomeKeyLocker homeKeyLocker;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_input_password);

    homeKeyLocker = new HomeKeyLocker();
    homeKeyLocker.lock(this);
     }
    }

我的日志是：

    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.rutabaazmat.lockpattern/com.example.rutabaazmat.lockpattern.InputPassword}: android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@1abfe808 -- permission denied for this window type
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2521)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2595)
    at android.app.ActivityThread.access$800(ActivityThread.java:178)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1470)
    at android.os.Handler.dispatchMessage(Handler.java:111)
    at android.os.Looper.loop(Looper.java:194)
    at android.app.ActivityThread.main(ActivityThread.java:5631)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)
 Caused by: android.view.WindowManager$BadTokenException: Unable to add window android.view.ViewRootImpl$W@1abfe808 -- permission denied for this window type
    at android.view.ViewRootImpl.setView(ViewRootImpl.java:704)
    at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:289)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85)
    at android.app.Dialog.show(Dialog.java:311)
    at com.example.rutabaazmat.lockpattern.HomeKeyLocker.lock(HomeKeyLocker.java:27)
    at com.example.rutabaazmat.lockpattern.InputPassword.onCreate(InputPassword.java:39)
    at android.app.Activity.performCreate(Activity.java:6092)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1112)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2468)

提前感谢您的帮助:)。

Answer 1

尝试在 AndroidManifest 中使用此权限。

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>