[Android]获取未安装的APK图标

网上关于"获取未安装的APK图标"的文章满天飞,但都是转帖,运行后的效果却是获取到Android的默认小机器人图标.那个暴寒....

现提供解决方法如下,废话不说,上效果图,见代码:

本方法需要使用到Java反射的知识,具体请参考:

http://java.sun.com/developer/technicalArticles/ALT/Reflection/index.html

借鉴的Android源码出处:

XXoo这个链接好长ooXX

package lab.sodino.fetchapkicon;
import java.io.File;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import android.app.Activity;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
/**
 * @author Sodino sodinoopen@hotmail.com
 * @since 2011年3月1日13时00分41秒
 * */
public class FetchAPKIconAct extends Activity {
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        showUninstallAPKIcon("/sdcard/APK/JarodYv.FishPool.apk");
        getUninatllApkInfo(this, "/sdcard/APK/JarodYv.FishPool.apk");
    }
    /** 网传的方法,但获取不成功 */
    public void getUninatllApkInfo(Context context, String archiveFilePath) {
        PackageManager pm = context.getPackageManager();
        PackageInfo info = pm.getPackageArchiveInfo(archiveFilePath, PackageManager.GET_ACTIVITIES);
        if (info != null) {
            ApplicationInfo appInfo = info.applicationInfo;
            Drawable icon = pm.getApplicationIcon(appInfo);
            ImageView image = (ImageView) findViewById(R.id.apkIconByTradition);
            image.setVisibility(View.VISIBLE);
            image.setImageDrawable(icon);
        }
    }
    //
    private void showUninstallAPKIcon(String apkPath) {
        String PATH_PackageParser = "android.content.pm.PackageParser";
        String PATH_AssetManager = "android.content.res.AssetManager";
        try {
            // apk包的文件路径
            // 这是一个Package 解释器, 是隐藏的
            // 构造函数的参数只有一个, apk文件的路径
            // PackageParser packageParser = new PackageParser(apkPath);
            Class pkgParserCls = Class.forName(PATH_PackageParser);
            Class[] typeArgs = new Class[1];
            typeArgs[0] = String.class;
            Constructor pkgParserCt = pkgParserCls.getConstructor(typeArgs);
            Object[] valueArgs = new Object[1];
            valueArgs[0] = apkPath;
            Object pkgParser = pkgParserCt.newInstance(valueArgs);
            Log.d("ANDROID_LAB", "pkgParser:" + pkgParser.toString());
            // 这个是与显示有关的, 里面涉及到一些像素显示等等, 我们使用默认的情况
            DisplayMetrics metrics = new DisplayMetrics();
            metrics.setToDefaults();
            // PackageParser.Package mPkgInfo = packageParser.parsePackage(new
            // File(apkPath), apkPath,
            // metrics, 0);
            typeArgs = new Class[4];
            typeArgs[0] = File.class;
            typeArgs[1] = String.class;
            typeArgs[2] = DisplayMetrics.class;
            typeArgs[3] = Integer.TYPE;
            Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod("parsePackage",
                    typeArgs);
            valueArgs = new Object[4];
            valueArgs[0] = new File(apkPath);
            valueArgs[1] = apkPath;
            valueArgs[2] = metrics;
            valueArgs[3] = 0;
            Object pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser, valueArgs);
            // 应用程序信息包, 这个公开的, 不过有些函数, 变量没公开
            // ApplicationInfo info = mPkgInfo.applicationInfo;
            Field appInfoFld = pkgParserPkg.getClass().getDeclaredField("applicationInfo");
            ApplicationInfo info = (ApplicationInfo) appInfoFld.get(pkgParserPkg);
            // uid 输出为"-1"，原因是未安装，系统未分配其Uid。
            Log.d("ANDROID_LAB", "pkg:" + info.packageName + " uid=" + info.uid);
            // Resources pRes = getResources();
            // AssetManager assmgr = new AssetManager();
            // assmgr.addAssetPath(apkPath);
            // Resources res = new Resources(assmgr, pRes.getDisplayMetrics(),
            // pRes.getConfiguration());
            Class assetMagCls = Class.forName(PATH_AssetManager);
            Constructor assetMagCt = assetMagCls.getConstructor((Class[]) null);
            Object assetMag = assetMagCt.newInstance((Object[]) null);
            typeArgs = new Class[1];
            typeArgs[0] = String.class;
            Method assetMag_addAssetPathMtd = assetMagCls.getDeclaredMethod("addAssetPath",
                    typeArgs);
            valueArgs = new Object[1];
            valueArgs[0] = apkPath;
            assetMag_addAssetPathMtd.invoke(assetMag, valueArgs);
            Resources res = getResources();
            typeArgs = new Class[3];
            typeArgs[0] = assetMag.getClass();
            typeArgs[1] = res.getDisplayMetrics().getClass();
            typeArgs[2] = res.getConfiguration().getClass();
            Constructor resCt = Resources.class.getConstructor(typeArgs);
            valueArgs = new Object[3];
            valueArgs[0] = assetMag;
            valueArgs[1] = res.getDisplayMetrics();
            valueArgs[2] = res.getConfiguration();
            res = (Resources) resCt.newInstance(valueArgs);
            CharSequence label = null;
            if (info.labelRes != 0) {
                label = res.getText(info.labelRes);
            }
            // if (label == null) {
            // label = (info.nonLocalizedLabel != null) ? info.nonLocalizedLabel
            // : info.packageName;
            // }
            Log.d("ANDROID_LAB", "label=" + label);
            // 这里就是读取一个apk程序的图标
            if (info.icon != 0) {
                Drawable icon = res.getDrawable(info.icon);
                ImageView image = (ImageView) findViewById(R.id.apkIconBySodino);
                image.setVisibility(View.VISIBLE);
                image.setImageDrawable(icon);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

注明出处: http://blog.csdn.net/sodino/archive/2011/03/01/6215224.aspx