android - 我的应用程序在尝试禁用主页按钮时崩溃

Question

我一直在尝试使用以下代码禁用主页按钮:

 @Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_HOME) {
        Log.i("TAG", "Press Home");
        System.exit(0);
        return true;
    } else {
        return super.onKeyDown(keyCode, event);
    }
}

@Override
public void onAttachedToWindow() {    
  this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
  super.onAttachedToWindow();}      

}

但这会使应用程序崩溃。

崩溃是由以下行引起的:

this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);

为什么会这样？可以做些什么来解决这个问题？

崩溃日志:

06-25 17:47:18.620 18125-18125/com.example.myapp E/AndroidRuntime: FATAL EXCEPTION: main
                                                                      Process: com.example.nandagp.qapp, PID: 18125
                                                                      java.lang.IllegalArgumentException: Window type can not be changed after the window is added.
                                                                          at android.os.Parcel.readException(Parcel.java:1962)
                                                                          at android.os.Parcel.readException(Parcel.java:1904)
                                                                          at android.view.IWindowSession$Stub$Proxy.relayout(IWindowSession.java:966)
                                                                          at android.view.ViewRootImpl.relayoutWindow(ViewRootImpl.java:7029)
                                                                          at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2264)
                                                                          at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1738)
                                                                          at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7745)
                                                                          at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
                                                                          at android.view.Choreographer.doCallbacks(Choreographer.java:723)
                                                                          at android.view.Choreographer.doFrame(Choreographer.java:658)
                                                                          at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
                                                                          at android.os.Handler.handleCallback(Handler.java:789)
                                                                          at android.os.Handler.dispatchMessage(Handler.java:98)
                                                                          at android.os.Looper.loop(Looper.java:164)
                                                                          at android.app.ActivityThread.main(ActivityThread.java:6938)
                                                                          at java.lang.reflect.Method.invoke(Native Method)
                                                                          at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
                                                                          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)

Answer 1

您应该删除此代码

this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);

来自 onAttachedToWindow()方法并将其放入 onCreate一。

希望这可以帮助

PS:对于主页按钮覆盖， read this post .禁用它并不容易且不推荐，它将导致用户无法退出您的应用程序并且(imo)这不是一个好主意，除非您在 kiosk mode 中运行.因此，如果您确实需要这样做，请仔细考虑，如果需要，请参阅我发布的第一个链接