我的应用程序在尝试禁用主页按钮时崩溃

时间:2018-06-25 12:14:56

标签: android android-activity crash android-actionbar android-homebutton

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();}      

}

但是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?该如何解决?

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)

2 个答案:

答案 0 :(得分:0)

您应该删除此代码

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

通过onAttachedToWindow()方法并将其放入onCreate方法中。

希望这会有所帮助

PS:对于主页按钮替代,read this post。禁用它并不容易,也不建议这样做,这将导致用户无法退出您的应用程序,并且(imo)除非您正在kiosk mode中运行,否则这不是一个好主意。因此,请仔细考虑是否确实需要这样做,如果确实需要,请参考我发布的第一个链接

答案 1 :(得分:0)

当用户按下“ KEYCODE_HOME”时,您将“关闭”应用程序:

if (keyCode == KeyEvent.KEYCODE_HOME) {
        Log.i("TAG", "Press Home");
        System.exit(0);

您将删除System.exit(0)