使用PopupWindow出现的错误

2011-07-07 02:42:00 1.3k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

MMCV安装后报错‘from mmcv import Config’？别慌，这是MMCV 2.0的锅！快速降级回退MMCV 1.x全指南本文详细解析了MMCV 2.0版本升级导致的‘from mmcv import Config’报错问题，提供了从诊断到降级回退MMCV 1.x的完整解决方案。通过pip和OpenMIM工具链的实操指南，帮助开发者快速解决版本冲突，确保项目稳定运行。阅读详情

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}