[Android]获取未安装的APK图标

 

本方法需要使用到Java反射的知识,具体请参考:
http://java.sun.com/developer/te ... flection/index.html

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 [e-mail]
* @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();
                }
        }
}