使用PopupWindow出现的错误

[yitiaochongzi]

MainActivity.java

package com.menu;

import android.app.Activity;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.PopupWindow;
import android.widget.LinearLayout.LayoutParams;

public class MainActivity extends Activity {
	PopupWindow popupMenu;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        View view = LayoutInflater.from(this).inflate(R.layout.menu_home, null);
		
		OnClickListener clickListener = new OnClickListener() {

			@Override
			public void onClick(View v) {
				switch (v.getId()) {
				case R.id.menu_home4:
					
					break;

				default:
					break;
				}
				popupMenu.dismiss();
			}
		};
		view.findViewById(R.id.menu_home4).setOnClickListener(clickListener);
		
		view.setFocusableInTouchMode(true);
		popupMenu = new PopupWindow(view, LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT, true);
		popupMenu.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
		popupMenu.setFocusable(true);
		popupMenu .setOutsideTouchable(true);
    }
    
    @Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK) {
			return true;
		}
		return super.onKeyDown(keyCode, event);
	}
    
	@Override
	public boolean onKeyUp(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_MENU) {
			popupMenu.showAtLocation(MainActivity.this.findViewById(R.id.main),
					Gravity.BOTTOM, 0, 0);
			return true;
		}
		return super.onKeyUp(keyCode, event);
	}
    
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/main"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
</LinearLayout>

menu_home.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:layout_width="wrap_content" android:layout_height="wrap_content"
	android:gravity="bottom|center_horizontal" >
			
			<Button android:id="@+id/menu_home4" android:layout_weight="1"
				android:layout_width="110px" android:layout_height="80px" android:textColor="#000000"
				android:text="帮助" android:paddingTop="10px" android:layout_gravity="center" android:layout_margin="10px" />
	
</LinearLayout>

几乎同时 按下 menu键和back键 （menu在前back在后） 可能爆出下面异常

 WARN/dalvikvm(1682): threadid=1: thread exiting with uncaught exception (group=0x400259f8)
 FATAL EXCEPTION: main
 java.lang.NullPointerException
     at android.widget.PopupWindow$PopupViewContainer.dispatchKeyEvent(PopupWindow.java:1340)
     at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2493)
     at android.view.ViewRoot.deliverKeyEvent(ViewRoot.java:2453)
     at android.view.ViewRoot.handleMessage(ViewRoot.java:1758)
     at android.os.Handler.dispatchMessage(Handler.java:99)
     at android.os.Looper.loop(Looper.java:144)
     at android.app.ActivityThread.main(ActivityThread.java:4937)
     at java.lang.reflect.Method.invokeNative(Native Method)
     at java.lang.reflect.Method.invoke(Method.java:521)
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
     at dalvik.system.NativeStart.main(Native Method)
 WARN/ActivityManager(97):   Force finishing activity com.fone.player/.Launcher
 WARN/ActivityManager(97): Activity pause timeout for HistoryRecord{46d6a0a0 com.fone.player/.Launcher}

请问是什么 原因造成的，怎样能避免出现上述问题

[知道分子]

不明白

/**
* Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState}
* for this view's window. Returns null if the view is not currently attached
* to the window. Normally you will not need to use this directly, but
* just use the standard high-level event callbacks like {@link #onKeyDown}.
*/
public KeyEvent.DispatcherState getKeyDispatcherState() {
return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null;
}

应该是这个返回空了。
PopupWindow 里的
private class PopupViewContainer extends FrameLayout
还没attached to the window吧

[yitiaochongzi]

算是 已经解决了吧
我将 PopupWindow 的 showAtLocation方法 放到了 Handler 中

还有一点 当 有View 进行动画Animation 时 最好 屏蔽 PopupWindow 的 调用显示

上述 修改暂时 没出现 什么问题

[xiaowangzaixian]

popup是什么东西。。。

[coding大叔]

Popupwindow弹出来，menu的点击事件无效是怎么回事啊 ？怎么解决的楼主？

[yitiaochongzi]

比较完美 解决方案
创建PopupWindow 的时候 不要调用 setFocusable(true);
在showAtLocation后在调用setFocusable(true);

并且在 dismiss的时候 调用setFocusable(false);

[obmeflbj]

引用 5 楼 yitiaochongzi 的回复:

比较完美 解决方案 创建PopupWindow 的时候 不要调用 setFocusable(true); 在showAtLocation后在调用setFocusable(true); 并且在 dismiss的时候 调用setFocusable(false);

我也遇到同样的问题，用5楼的方法解决了，谢了