Question

我正在尝试创建一个应用程序，该应用程序提供已安装应用程序的列表，并在单击项目时启动另一个活动，该活动指出已安装应用程序所需的权限。我获得了已安装的应用程序列表，但是当我单击任何应用程序而不是启动新活动时，应用程序强制关闭。

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) getApplication();
        appData.setPackageInfo(packageInfo);

        Intent appInfo = new Intent(ApkListActivity.this, ApkInfo.class);
        startActivity(appInfo);
    }
}

ApkInfo.java

package com.example.appslist;

import android.os.Bundle;
import android.app.Activity;
import com.example.appslist.app.AppData;
import android.content.pm.FeatureInfo;
import android.content.pm.PackageInfo;
import android.widget.TextView;

public class ApkInfo extends Activity {

  TextView appLabel, packageName, version, features;
    TextView permissions, andVersion,path;
    PackageInfo packageInfo;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.apkinfo);

        findViewsById();

        AppData appData = (AppData) getApplicationContext();
        packageInfo = appData.getPackageInfo();

        setValues();

    }

    private void findViewsById() {
        appLabel = (TextView) findViewById(R.id.applabel);
        packageName = (TextView) findViewById(R.id.package_name);
        version = (TextView) findViewById(R.id.version_name);
        features = (TextView) findViewById(R.id.req_feature);
        permissions = (TextView) findViewById(R.id.req_permission);
        andVersion = (TextView) findViewById(R.id.andversion);
        path = (TextView) findViewById(R.id.path);

    }

    private void setValues() {
        // APP name
        appLabel.setText(getPackageManager().getApplicationLabel(
                packageInfo.applicationInfo));

        // package name
        packageName.setText(packageInfo.packageName);

        // version name
        version.setText(packageInfo.versionName);

        // target version
        andVersion.setText(Integer
                .toString(packageInfo.applicationInfo.targetSdkVersion));

        // path
        path.setText(packageInfo.applicationInfo.sourceDir);


        // features
        if (packageInfo.reqFeatures != null)
            features.setText(getFeatures(packageInfo.reqFeatures));
        else
            features.setText("-");

        // uses-permission
        if (packageInfo.requestedPermissions != null)
            permissions
                    .setText(getPermissions(packageInfo.requestedPermissions));
        else
            permissions.setText("-");
    }

    // Convert string array to comma separated string
    private String getPermissions(String[] requestedPermissions) {
        String permission = "";
        for (int i = 0; i < requestedPermissions.length; i++) {
            permission = permission + requestedPermissions[i] + ",\n";
        }
        return permission;
    }

    // Convert string array to comma separated string
    private String getFeatures(FeatureInfo[] reqFeatures) {
        String features = "";
        for (int i = 0; i < reqFeatures.length; i++) {
            features = features + reqFeatures[i] + ",\n";
        }
        return features;
    }
}

AppData类

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;
    }
}

我已经尝试在清单中注册AppData，尝试使用bundle，强制关闭。请帮忙。

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>



</manifest>

这是LogCat

04-09 12:17:47.305: E/asset(5752): MAS: getAppPckgAndVerCode package: com.example.appslist === version 1
04-09 12:17:47.329: D/dalvikvm(5752): Trying to load lib lib_glossary.so 0x0
04-09 12:17:47.329: I/dalvikvm(5752): Unable to dlopen(lib_glossary.so): Cannot load library: load_library[1083]: Library 'lib_glossary.so' not found
04-09 12:17:47.329: E/MBGlossaryManager(5752): lib_glossary.so can't be loaded
04-09 12:17:47.469: E/asset(5752): MAS: getAppPckgAndVerCode package: com.google.android.location === version 8
04-09 12:17:47.469: E/asset(5752): MAS: getAppPckgAndVerCode package: com.android.launcher === version 8
04-09 12:17:47.477: E/asset(5752): MAS: getAppPckgAndVerCode package: com.android.defcontainer === version 8
04-09 12:17:47.477: E/asset(5752): MAS: getAppPckgAndVerCode package: com.navngo.igo.javaclient === version 148360
04-09 12:17:47.485: E/asset(5752): MAS: getAppPckgAndVerCode package: com.android.contacts === version 8
04-09 12:17:47.493: E/asset(5752): MAS: getAppPckgAndVerCode package: com.example.backgroundapp === version 1
04-09 12:17:47.493: E/asset(5752): MAS: getAppPckgAndVerCode package: com.arcsoft.photoworkshop === version 5
04-09 12:17:47.548: D/dalvikvm(5752): GC_EXTERNAL_ALLOC freed 934 objects / 65512 bytes in 49ms
04-09 12:17:47.555: E/asset(5752): MAS: getAppPckgAndVerCode package: com.android.phone === version 8
04-09 12:17:47.563: E/asset(5752): MAS: getAppPckgAndVerCode package: com.android.calculator2 === version 8
04-09 12:17:47.563: E/asset(5752): MAS: getAppPckgAndVerCode package: com.android.htmlviewer === version 8
04-09 12:17:47.563: E/asset(5752): MAS: getAppPckgAndVerCode package: com.example.myfirstapp === version 1
04-09 12:17:47.571: E/asset(5752): MAS: getAppPckgAndVerCode package: com.android.providers.calendar === version 8
04-09 12:17:47.571: E/asset(5752): MAS: getAppPckgAndVerCode package: com.android.bluetooth === version 8
04-09 12:17:47.571: E/asset(5752): MAS: getAppPckgAndVerCode package: com.example.sessionmanagement === version 1
04-09 12:17:47.579: E/asset(5752): MAS: getAppPckgAndVerCode package: com.google.android.location === version 8
04-09 12:17:47.579: E/asset(5752): MAS: getAppPckgAndVerCode package: com.android.launcher === version 8
04-09 12:17:47.587: E/asset(5752): MAS: getAppPckgAndVerCode package: com.android.defcontainer === version 8
04-09 12:17:47.587: E/asset(5752): MAS: getAppPckgAndVerCode package: com.navngo.igo.javaclient === version 148360
04-09 12:17:47.594: E/asset(5752): MAS: getAppPckgAndVerCode package: com.android.contacts === version 8
04-09 12:17:47.641: E/asset(5752): MAS: getAppPckgAndVerCode package: com.example.backgroundapp === version 1
04-09 12:17:47.782: W/IInputConnectionWrapper(5752): showStatusIcon on inactive InputConnection
04-09 12:17:47.782: W/IInputConnectionWrapper(5752): clearMetaKeyStates on inactive InputConnection
04-09 12:17:49.704: D/AndroidRuntime(5752): Shutting down VM
04-09 12:17:49.704: W/dalvikvm(5752): threadid=1: thread exiting with uncaught exception (group=0x400207e0)
04-09 12:17:49.719: E/AndroidRuntime(5752): FATAL EXCEPTION: main
04-09 12:17:49.719: E/AndroidRuntime(5752): java.lang.ClassCastException: android.app.Application
04-09 12:17:49.719: E/AndroidRuntime(5752):     at com.example.appslist.ApkListActivity.onItemClick(ApkListActivity.java:42)
04-09 12:17:49.719: E/AndroidRuntime(5752):     at android.widget.AdapterView.performItemClick(AdapterView.java:284)
04-09 12:17:49.719: E/AndroidRuntime(5752):     at android.widget.ListView.performItemClick(ListView.java:3444)
04-09 12:17:49.719: E/AndroidRuntime(5752):     at android.widget.AbsListView$PerformClick.run(AbsListView.java:1696)
04-09 12:17:49.719: E/AndroidRuntime(5752):     at android.os.Handler.handleCallback(Handler.java:587)
04-09 12:17:49.719: E/AndroidRuntime(5752):     at android.os.Handler.dispatchMessage(Handler.java:92)
04-09 12:17:49.719: E/AndroidRuntime(5752):     at android.os.Looper.loop(Looper.java:143)
04-09 12:17:49.719: E/AndroidRuntime(5752):     at android.app.ActivityThread.main(ActivityThread.java:4717)
04-09 12:17:49.719: E/AndroidRuntime(5752):     at java.lang.reflect.Method.invokeNative(Native Method)
04-09 12:17:49.719: E/AndroidRuntime(5752):     at java.lang.reflect.Method.invoke(Method.java:521)
04-09 12:17:49.719: E/AndroidRuntime(5752):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
04-09 12:17:49.719: E/AndroidRuntime(5752):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
04-09 12:17:49.719: E/AndroidRuntime(5752):     at dalvik.system.NativeStart.main(Native Method)
04-09 12:17:51.118: I/Process(5752): Sending signal. PID: 5752 SIG: 9
04-09 12:24:48.087: E/asset(5827): MAS: getAppPckgAndVerCode package: com.example.appslist === version 1
04-09 12:24:48.102: D/dalvikvm(5827): Trying to load lib lib_glossary.so 0x0
04-09 12:24:48.110: I/dalvikvm(5827): Unable to dlopen(lib_glossary.so): Cannot load library: load_library[1083]: Library 'lib_glossary.so' not found
04-09 12:24:48.110: E/MBGlossaryManager(5827): lib_glossary.so can't be loaded
04-09 12:24:48.212: E/asset(5827): MAS: getAppPckgAndVerCode package: com.google.android.location === version 8
04-09 12:24:48.219: E/asset(5827): MAS: getAppPckgAndVerCode package: com.android.launcher === version 8
04-09 12:24:48.219: E/asset(5827): MAS: getAppPckgAndVerCode package: com.android.defcontainer === version 8
04-09 12:24:48.219: E/asset(5827): MAS: getAppPckgAndVerCode package: com.navngo.igo.javaclient === version 148360
04-09 12:24:48.227: E/asset(5827): MAS: getAppPckgAndVerCode package: com.android.contacts === version 8
04-09 12:24:48.235: E/asset(5827): MAS: getAppPckgAndVerCode package: com.example.backgroundapp === version 1
04-09 12:24:48.235: E/asset(5827): MAS: getAppPckgAndVerCode package: com.arcsoft.photoworkshop === version 5
04-09 12:24:48.298: D/dalvikvm(5827): GC_EXTERNAL_ALLOC freed 971 objects / 66752 bytes in 58ms
04-09 12:24:48.305: E/asset(5827): MAS: getAppPckgAndVerCode package: com.android.phone === version 8
04-09 12:24:48.313: E/asset(5827): MAS: getAppPckgAndVerCode package: com.android.calculator2 === version 8
04-09 12:24:48.313: E/asset(5827): MAS: getAppPckgAndVerCode package: com.android.htmlviewer === version 8
04-09 12:24:48.313: E/asset(5827): MAS: getAppPckgAndVerCode package: com.example.myfirstapp === version 1
04-09 12:24:48.321: E/asset(5827): MAS: getAppPckgAndVerCode package: com.android.providers.calendar === version 8
04-09 12:24:48.321: E/asset(5827): MAS: getAppPckgAndVerCode package: com.android.bluetooth === version 8
04-09 12:24:48.329: E/asset(5827): MAS: getAppPckgAndVerCode package: com.example.sessionmanagement === version 1
04-09 12:24:48.329: E/asset(5827): MAS: getAppPckgAndVerCode package: com.google.android.location === version 8
04-09 12:24:48.329: E/asset(5827): MAS: getAppPckgAndVerCode package: com.android.launcher === version 8
04-09 12:24:48.337: E/asset(5827): MAS: getAppPckgAndVerCode package: com.android.defcontainer === version 8
04-09 12:24:48.337: E/asset(5827): MAS: getAppPckgAndVerCode package: com.navngo.igo.javaclient === version 148360
04-09 12:24:48.344: E/asset(5827): MAS: getAppPckgAndVerCode package: com.android.contacts === version 8
04-09 12:24:48.391: E/asset(5827): MAS: getAppPckgAndVerCode package: com.example.backgroundapp === version 1
04-09 12:24:49.805: D/AndroidRuntime(5827): Shutting down VM
04-09 12:24:49.805: W/dalvikvm(5827): threadid=1: thread exiting with uncaught exception (group=0x400207e0)
04-09 12:24:49.821: E/AndroidRuntime(5827): FATAL EXCEPTION: main
04-09 12:24:49.821: E/AndroidRuntime(5827): java.lang.ClassCastException: android.app.Application
04-09 12:24:49.821: E/AndroidRuntime(5827):     at com.example.appslist.ApkListActivity.onItemClick(ApkListActivity.java:42)
04-09 12:24:49.821: E/AndroidRuntime(5827):     at android.widget.AdapterView.performItemClick(AdapterView.java:284)
04-09 12:24:49.821: E/AndroidRuntime(5827):     at android.widget.ListView.performItemClick(ListView.java:3444)
04-09 12:24:49.821: E/AndroidRuntime(5827):     at android.widget.AbsListView$PerformClick.run(AbsListView.java:1696)
04-09 12:24:49.821: E/AndroidRuntime(5827):     at android.os.Handler.handleCallback(Handler.java:587)
04-09 12:24:49.821: E/AndroidRuntime(5827):     at android.os.Handler.dispatchMessage(Handler.java:92)
04-09 12:24:49.821: E/AndroidRuntime(5827):     at android.os.Looper.loop(Looper.java:143)
04-09 12:24:49.821: E/AndroidRuntime(5827):     at android.app.ActivityThread.main(ActivityThread.java:4717)
04-09 12:24:49.821: E/AndroidRuntime(5827):     at java.lang.reflect.Method.invokeNative(Native Method)
04-09 12:24:49.821: E/AndroidRuntime(5827):     at java.lang.reflect.Method.invoke(Method.java:521)
04-09 12:24:49.821: E/AndroidRuntime(5827):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
04-09 12:24:49.821: E/AndroidRuntime(5827):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
04-09 12:24:49.821: E/AndroidRuntime(5827):     at dalvik.system.NativeStart.main(Native Method)
04-09 12:24:51.688: I/Process(5827): Sending signal. PID: 5827 SIG: 9
04-09 12:24:55.165: E/asset(5835): MAS: getAppPckgAndVerCode package: com.example.appslist === version 1
04-09 12:24:55.188: D/dalvikvm(5835): Trying to load lib lib_glossary.so 0x0
04-09 12:24:55.188: I/dalvikvm(5835): Unable to dlopen(lib_glossary.so): Cannot load library: load_library[1083]: Library 'lib_glossary.so' not found
04-09 12:24:55.188: E/MBGlossaryManager(5835): lib_glossary.so can't be loaded
04-09 12:24:55.313: E/asset(5835): MAS: getAppPckgAndVerCode package: com.google.android.location === version 8
04-09 12:24:55.321: E/asset(5835): MAS: getAppPckgAndVerCode package: com.android.launcher === version 8
04-09 12:24:55.329: E/asset(5835): MAS: getAppPckgAndVerCode package: com.android.defcontainer === version 8
04-09 12:24:55.329: E/asset(5835): MAS: getAppPckgAndVerCode package: com.navngo.igo.javaclient === version 148360
04-09 12:24:55.337: E/asset(5835): MAS: getAppPckgAndVerCode package: com.android.contacts === version 8
04-09 12:24:55.337: E/asset(5835): MAS: getAppPckgAndVerCode package: com.example.backgroundapp === version 1
04-09 12:24:55.344: E/asset(5835): MAS: getAppPckgAndVerCode package: com.arcsoft.photoworkshop === version 5
04-09 12:24:55.391: D/dalvikvm(5835): GC_EXTERNAL_ALLOC freed 993 objects / 67608 bytes in 49ms
04-09 12:24:55.407: E/asset(5835): MAS: getAppPckgAndVerCode package: com.android.phone === version 8
04-09 12:24:55.415: E/asset(5835): MAS: getAppPckgAndVerCode package: com.android.calculator2 === version 8
04-09 12:24:55.415: E/asset(5835): MAS: getAppPckgAndVerCode package: com.android.htmlviewer === version 8
04-09 12:24:55.415: E/asset(5835): MAS: getAppPckgAndVerCode package: com.example.myfirstapp === version 1
04-09 12:24:55.423: E/asset(5835): MAS: getAppPckgAndVerCode package: com.android.providers.calendar === version 8
04-09 12:24:55.423: E/asset(5835): MAS: getAppPckgAndVerCode package: com.android.bluetooth === version 8
04-09 12:24:55.423: E/asset(5835): MAS: getAppPckgAndVerCode package: com.example.sessionmanagement === version 1
04-09 12:24:55.430: E/asset(5835): MAS: getAppPckgAndVerCode package: com.google.android.location === version 8
04-09 12:24:55.430: E/asset(5835): MAS: getAppPckgAndVerCode package: com.android.launcher === version 8
04-09 12:24:55.438: E/asset(5835): MAS: getAppPckgAndVerCode package: com.android.defcontainer === version 8
04-09 12:24:55.438: E/asset(5835): MAS: getAppPckgAndVerCode package: com.navngo.igo.javaclient === version 148360
04-09 12:24:55.446: E/asset(5835): MAS: getAppPckgAndVerCode package: com.android.contacts === version 8
04-09 12:24:55.493: E/asset(5835): MAS: getAppPckgAndVerCode package: com.example.backgroundapp === version 1
04-09 12:24:56.641: D/AndroidRuntime(5835): Shutting down VM
04-09 12:24:56.641: W/dalvikvm(5835): threadid=1: thread exiting with uncaught exception (group=0x400207e0)
04-09 12:24:56.657: E/AndroidRuntime(5835): FATAL EXCEPTION: main
04-09 12:24:56.657: E/AndroidRuntime(5835): java.lang.ClassCastException: android.app.Application
04-09 12:24:56.657: E/AndroidRuntime(5835):     at com.example.appslist.ApkListActivity.onItemClick(ApkListActivity.java:42)
04-09 12:24:56.657: E/AndroidRuntime(5835):     at android.widget.AdapterView.performItemClick(AdapterView.java:284)
04-09 12:24:56.657: E/AndroidRuntime(5835):     at android.widget.ListView.performItemClick(ListView.java:3444)
04-09 12:24:56.657: E/AndroidRuntime(5835):     at android.widget.AbsListView$PerformClick.run(AbsListView.java:1696)
04-09 12:24:56.657: E/AndroidRuntime(5835):     at android.os.Handler.handleCallback(Handler.java:587)
04-09 12:24:56.657: E/AndroidRuntime(5835):     at android.os.Handler.dispatchMessage(Handler.java:92)
04-09 12:24:56.657: E/AndroidRuntime(5835):     at android.os.Looper.loop(Looper.java:143)
04-09 12:24:56.657: E/AndroidRuntime(5835):     at android.app.ActivityThread.main(ActivityThread.java:4717)
04-09 12:24:56.657: E/AndroidRuntime(5835):     at java.lang.reflect.Method.invokeNative(Native Method)
04-09 12:24:56.657: E/AndroidRuntime(5835):     at java.lang.reflect.Method.invoke(Method.java:521)
04-09 12:24:56.657: E/AndroidRuntime(5835):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
04-09 12:24:56.657: E/AndroidRuntime(5835):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
04-09 12:24:56.657: E/AndroidRuntime(5835):     at dalvik.system.NativeStart.main(Native Method)
04-09 12:24:58.040: I/Process(5835): Sending signal. PID: 5835 SIG: 9
04-09 12:39:54.556: I/Process(5930): Sending signal. PID: 5930 SIG: 9
04-09 12:43:51.244: E/asset(5972): MAS: getAppPckgAndVerCode package: com.example.appslist === version 1
04-09 12:43:51.283: D/dalvikvm(5972): Trying to load lib lib_glossary.so 0x0
04-09 12:43:51.291: I/dalvikvm(5972): Unable to dlopen(lib_glossary.so): Cannot load library: load_library[1083]: Library 'lib_glossary.so' not found
04-09 12:43:51.291: E/MBGlossaryManager(5972): lib_glossary.so can't be loaded
04-09 12:43:51.494: E/asset(5972): MAS: getAppPckgAndVerCode package: com.google.android.location === version 8
04-09 12:43:51.494: E/asset(5972): MAS: getAppPckgAndVerCode package: com.android.launcher === version 8
04-09 12:43:51.502: E/asset(5972): MAS: getAppPckgAndVerCode package: com.android.defcontainer === version 8
04-09 12:43:51.509: E/asset(5972): MAS: getAppPckgAndVerCode package: com.navngo.igo.javaclient === version 148360
04-09 12:43:51.509: E/asset(5972): MAS: getAppPckgAndVerCode package: com.android.contacts === version 8
04-09 12:43:51.517: E/asset(5972): MAS: getAppPckgAndVerCode package: com.example.backgroundapp === version 1
04-09 12:43:51.517: E/asset(5972): MAS: getAppPckgAndVerCode package: com.arcsoft.photoworkshop === version 5
04-09 12:43:51.580: D/dalvikvm(5972): GC_EXTERNAL_ALLOC freed 1059 objects / 70176 bytes in 57ms
04-09 12:43:51.588: E/asset(5972): MAS: getAppPckgAndVerCode package: com.android.phone === version 8
04-09 12:43:51.595: E/asset(5972): MAS: getAppPckgAndVerCode package: com.android.calculator2 === version 8
04-09 12:43:51.595: E/asset(5972): MAS: getAppPckgAndVerCode package: com.android.htmlviewer === version 8
04-09 12:43:51.595: E/asset(5972): MAS: getAppPckgAndVerCode package: com.example.myfirstapp === version 1
04-09 12:43:51.603: E/asset(5972): MAS: getAppPckgAndVerCode package: com.android.providers.calendar === version 8
04-09 12:43:51.603: E/asset(5972): MAS: getAppPckgAndVerCode package: com.android.bluetooth === version 8
04-09 12:43:51.611: E/asset(5972): MAS: getAppPckgAndVerCode package: com.example.sessionmanagement === version 1
04-09 12:43:51.611: E/asset(5972): MAS: getAppPckgAndVerCode package: com.google.android.location === version 8
04-09 12:43:51.619: E/asset(5972): MAS: getAppPckgAndVerCode package: com.android.launcher === version 8
04-09 12:43:51.619: E/asset(5972): MAS: getAppPckgAndVerCode package: com.android.defcontainer === version 8
04-09 12:43:51.619: E/asset(5972): MAS: getAppPckgAndVerCode package: com.navngo.igo.javaclient === version 148360
04-09 12:43:51.627: E/asset(5972): MAS: getAppPckgAndVerCode package: com.android.contacts === version 8
04-09 12:43:51.673: E/asset(5972): MAS: getAppPckgAndVerCode package: com.example.backgroundapp === version 1
04-09 12:43:56.166: D/AndroidRuntime(5972): Shutting down VM
04-09 12:43:56.166: W/dalvikvm(5972): threadid=1: thread exiting with uncaught exception (group=0x400207e0)
04-09 12:43:56.189: E/AndroidRuntime(5972): FATAL EXCEPTION: main
04-09 12:43:56.189: E/AndroidRuntime(5972): java.lang.ClassCastException: android.app.Application
04-09 12:43:56.189: E/AndroidRuntime(5972):     at com.example.appslist.ApkListActivity.onItemClick(ApkListActivity.java:43)
04-09 12:43:56.189: E/AndroidRuntime(5972):     at android.widget.AdapterView.performItemClick(AdapterView.java:284)
04-09 12:43:56.189: E/AndroidRuntime(5972):     at android.widget.ListView.performItemClick(ListView.java:3444)
04-09 12:43:56.189: E/AndroidRuntime(5972):     at android.widget.AbsListView$PerformClick.run(AbsListView.java:1696)
04-09 12:43:56.189: E/AndroidRuntime(5972):     at android.os.Handler.handleCallback(Handler.java:587)
04-09 12:43:56.189: E/AndroidRuntime(5972):     at android.os.Handler.dispatchMessage(Handler.java:92)
04-09 12:43:56.189: E/AndroidRuntime(5972):     at android.os.Looper.loop(Looper.java:143)
04-09 12:43:56.189: E/AndroidRuntime(5972):     at android.app.ActivityThread.main(ActivityThread.java:4717)
04-09 12:43:56.189: E/AndroidRuntime(5972):     at java.lang.reflect.Method.invokeNative(Native Method)
04-09 12:43:56.189: E/AndroidRuntime(5972):     at java.lang.reflect.Method.invoke(Method.java:521)
04-09 12:43:56.189: E/AndroidRuntime(5972):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
04-09 12:43:56.189: E/AndroidRuntime(5972):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
04-09 12:43:56.189: E/AndroidRuntime(5972):     at dalvik.system.NativeStart.main(Native Method)
04-09 12:43:57.486: I/Process(5972): Sending signal. PID: 5972 SIG: 9

Answer 1

如果您仔细阅读错误日志，您将看到问题所在。它在线

AppData appData = (AppData) getApplication();

您的onItemClick方法的

。 getApplication方法返回com.android.Application，您尝试将其转换为AppData类，但它不是AppData的实例。

虽然AppData的每个实例也是Application的实例，但反之亦然：Application的实例不会自动成为其子类的实例。

Answer 2

如果你扩展应用程序类，你应该修改你的manifest [add android：name]。在您的情况下，您应该添加到清单：

 <application
        android:name=".app.AppData"

第二个活动没有开始，App力关闭：致命异常主要; java.lang.ClassCastException：android.app.Application

2 个答案: