中安装的应用程序列表力关闭：java.lang.ClassCastException [英] List of Installed apps force closes : java.lang.ClassCastException
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问题描述
我试图让一个应用程序，它给安装的应用程序列表，单击一个项目时，启动该国在安装的应用程序所需的权限的另一个活动。我得到了安装的应用程序列表中，但是当我点击任何应用程序，而不是开始新的活动，该应用程序强制关闭。
I am trying to make an app which gives the list of installed apps and when an item is clicked , starts another activity which states the permissions required by installed apps. I got the installed application list, but when I click any app instead of starting new activity , the application force closes.
MainActivity
MainActivity
package com.example.appslist;
import java.util.List;
import com.example.appslist.adapter.ApkAdapter;
import com.example.appslist.app.AppData;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
public class ApkListActivity extends Activity implements OnItemClickListener {
PackageManager packageManager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
packageManager = getPackageManager();
List<PackageInfo> packageList = packageManager
.getInstalledPackages(PackageManager.GET_PERMISSIONS);
ListView mylistview= (ListView) findViewById(android.R.id.list);
mylistview.setAdapter(new ApkAdapter(this, packageList, packageManager));
mylistview.setOnItemClickListener(this);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long row) {
PackageInfo packageInfo = (PackageInfo) parent
.getItemAtPosition(position);
AppData appData = (AppData) getApplicationContext();
appData.setPackageInfo(packageInfo);
Intent appInfo = new Intent(getApplicationContext(), ApkInfo.class);
startActivity(appInfo);
}
}
LogCat中
LogCat
04-02 11:16:04.536: E/asset(2777): MAS: getAppPckgAndVerCode package: com.example.appslist === version 1
04-02 11:16:04.559: D/dalvikvm(2777): Trying to load lib lib_glossary.so 0x0
04-02 11:16:04.559: I/dalvikvm(2777): Unable to dlopen(lib_glossary.so): Cannot load library: load_library[1083]: Library 'lib_glossary.so' not found
04-02 11:16:04.567: E/MBGlossaryManager(2777): lib_glossary.so can't be loaded
04-02 11:16:04.700: E/asset(2777): MAS: getAppPckgAndVerCode package: com.google.android.location === version 8
04-02 11:16:04.708: E/asset(2777): MAS: getAppPckgAndVerCode package: com.android.launcher === version 8
04-02 11:16:04.708: E/asset(2777): MAS: getAppPckgAndVerCode package: com.android.defcontainer === version 8
04-02 11:16:04.708: E/asset(2777): MAS: getAppPckgAndVerCode package: com.navngo.igo.javaclient === version 148360
04-02 11:16:04.715: E/asset(2777): MAS: getAppPckgAndVerCode package: com.android.contacts === version 8
04-02 11:16:04.723: E/asset(2777): MAS: getAppPckgAndVerCode package: com.arcsoft.photoworkshop === version 5
04-02 11:16:04.778: D/dalvikvm(2777): GC_EXTERNAL_ALLOC freed 822 objects / 60704 bytes in 56ms
04-02 11:16:04.786: E/asset(2777): MAS: getAppPckgAndVerCode package: com.android.phone === version 8
04-02 11:16:04.794: E/asset(2777): MAS: getAppPckgAndVerCode package: com.android.calculator2 === version 8
04-02 11:16:04.794: E/asset(2777): MAS: getAppPckgAndVerCode package: com.android.htmlviewer === version 8
04-02 11:16:04.801: E/asset(2777): MAS: getAppPckgAndVerCode package: com.example.myfirstapp === version 1
04-02 11:16:04.801: E/asset(2777): MAS: getAppPckgAndVerCode package: com.android.providers.calendar === version 8
04-02 11:16:04.809: E/asset(2777): MAS: getAppPckgAndVerCode package: com.android.bluetooth === version 8
04-02 11:16:04.809: E/asset(2777): MAS: getAppPckgAndVerCode package: com.example.sessionmanagement === version 1
04-02 11:16:04.817: E/asset(2777): MAS: getAppPckgAndVerCode package: com.android.calendar === version 8
04-02 11:16:04.817: E/asset(2777): MAS: getAppPckgAndVerCode package: com.google.android.location === version 8
04-02 11:16:04.817: E/asset(2777): MAS: getAppPckgAndVerCode package: com.android.launcher === version 8
04-02 11:16:04.825: E/asset(2777): MAS: getAppPckgAndVerCode package: com.android.defcontainer === version 8
04-02 11:16:04.825: E/asset(2777): MAS: getAppPckgAndVerCode package: com.navngo.igo.javaclient === version 148360
04-02 11:16:04.872: E/asset(2777): MAS: getAppPckgAndVerCode package: com.android.contacts === version 8
04-02 11:16:06.536: D/AndroidRuntime(2777): Shutting down VM
04-02 11:16:06.536: W/dalvikvm(2777): threadid=1: thread exiting with uncaught exception (group=0x400207e0)
04-02 11:16:06.551: E/AndroidRuntime(2777): FATAL EXCEPTION: main
04-02 11:16:06.551: E/AndroidRuntime(2777): java.lang.ClassCastException: android.app.Application
04-02 11:16:06.551: E/AndroidRuntime(2777): at com.example.appslist.ApkListActivity.onItemClick(ApkListActivity.java:44)
04-02 11:16:06.551: E/AndroidRuntime(2777): at android.widget.AdapterView.performItemClick(AdapterView.java:284)
04-02 11:16:06.551: E/AndroidRuntime(2777): at android.widget.ListView.performItemClick(ListView.java:3444)
04-02 11:16:06.551: E/AndroidRuntime(2777): at android.widget.AbsListView$PerformClick.run(AbsListView.java:1696)
04-02 11:16:06.551: E/AndroidRuntime(2777): at android.os.Handler.handleCallback(Handler.java:587)
04-02 11:16:06.551: E/AndroidRuntime(2777): at android.os.Handler.dispatchMessage(Handler.java:92)
04-02 11:16:06.551: E/AndroidRuntime(2777): at android.os.Looper.loop(Looper.java:143)
04-02 11:16:06.551: E/AndroidRuntime(2777): at android.app.ActivityThread.main(ActivityThread.java:4717)
04-02 11:16:06.551: E/AndroidRuntime(2777): at java.lang.reflect.Method.invokeNative(Native Method)
04-02 11:16:06.551: E/AndroidRuntime(2777): at java.lang.reflect.Method.invoke(Method.java:521)
04-02 11:16:06.551: E/AndroidRuntime(2777): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
04-02 11:16:06.551: E/AndroidRuntime(2777): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
04-02 11:16:06.551: E/AndroidRuntime(2777): at dalvik.system.NativeStart.main(Native Method)
04-02 11:16:08.137: I/Process(2777): Sending signal. PID: 2777 SIG: 9
我不明白强制关闭的原因。请帮助
I cannot understand the reason for force closing. Please help
AppData.java
AppData.java
package com.example.appslist.app;
import android.app.Application;
import android.content.pm.PackageInfo;
public class AppData extends Application {
PackageInfo packageInfo;
public PackageInfo getPackageInfo() {
return packageInfo;
}
public void setPackageInfo(PackageInfo packageInfo) {
this.packageInfo = packageInfo;
}
}
ApkAdapter.java
ApkAdapter.java
package com.example.appslist.adapter;
import java.util.List;
import com.example.appslist.R;
import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
public class ApkAdapter extends BaseAdapter {
List<PackageInfo> packageList;
Activity context;
PackageManager packageManager;
public ApkAdapter(Activity context, List<PackageInfo> packageList,
PackageManager packageManager) {
super();
this.context = context;
this.packageList = packageList;
this.packageManager = packageManager;
}
private class ViewHolder {
TextView apkName;
}
public int getCount() {
return packageList.size();
}
public Object getItem(int position) {
return packageList.get(position);
}
public long getItemId(int position) {
return 0;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
if (convertView == null) {
convertView = inflater.inflate(R.layout.apklist_item, null);
holder = new ViewHolder();
holder.apkName = (TextView) convertView.findViewById(R.id.appname);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
PackageInfo packageInfo = (PackageInfo) getItem(position);
Drawable appIcon = packageManager
.getApplicationIcon(packageInfo.applicationInfo);
String appName = packageManager.getApplicationLabel(
packageInfo.applicationInfo).toString();
appIcon.setBounds(0, 0, 40, 40);
holder.apkName.setCompoundDrawables(appIcon, null, null, null);
holder.apkName.setCompoundDrawablePadding(15);
holder.apkName.setText(appName);
return convertView;
}
}
清单文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.appslist"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme"
>
<activity
android:name="com.example.appslist.ApkListActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".ApkInfo"
android:label="@string/title_activity_apk_info" >
</activity>
</application>
推荐答案
编辑：
好像你还没有在清单中登记的应用程序数据。
It seems you have not registered AppData in the Manifest
尝试添加
android:name=".AppData"
在清单中的应用标签。
这即
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme"
android:name=".AppData"
>
错误是在这一行
Error is in this line
AppData appData = (AppData) getApplicationContext();
修改成
AppData appData = (AppData) getApplication();
这篇关于中安装的应用程序列表力关闭：java.lang.ClassCastException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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