获取未安装apk图标

在网上找了一圈都是以下代码，在模拟器上测试可以获取apk图标，真机上却无法显示，唉~~

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.apk_icon);              image.setVisibility(View.VISIBLE);            image.setImageDrawable(icon);        }      }

跟踪了一下主要是 PackageInfo info = pm.getPackageArchiveInfo(archiveFilePath, PackageManager.GET_ACTIVITIES);获取没有问题，可以得到Application的所有信息，但是再调用PackageManager获取apk图标却找不到，只返回了apk默认图标（绿色机器人），由于PackageManager是在当前应用内查找，所以查找不到。

依据网上查找的资料，利用反射机制构建一个未安装apk的Resource对象，来访问apk内的资源。

public static Resources getResources(String apkPath) throws Exception {    String PATH_AssetManager = "android.content.res.AssetManager";        Class assetMagCls = Class.forName(PATH_AssetManager);          Constructor assetMagCt = assetMagCls.getConstructor((Class[]) null);          Object assetMag = assetMagCt.newInstance((Object[]) null);          Class[] typeArgs = new Class[1];          typeArgs[0] = String.class;          Method assetMag_addAssetPathMtd = assetMagCls.getDeclaredMethod("addAssetPath",                  typeArgs);          Object[] 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);                return res;    }

通过PackageManager获取ApplicationInfo，利用Resource获取图标如下

public static Drawable getUninstallAPKIcon(Context context,String apkPath) {  PackageManager pm = context.getPackageManager();          PackageInfo info = pm.getPackageArchiveInfo(apkPath, PackageManager.GET_ACTIVITIES);                Resources res = null;        try {res = getResources(context,apkPath);} catch (Exception e) {return null;}if(info != null){ApplicationInfo appInfo = info.applicationInfo;return res.getDrawable(appInfo.icon); }return null;    }

最近在网上找到另一种方便方式获取apk图标的方式，和大家分享一下

public Drawable loadUninstallApkIcon(Context context, String archiveFilePath) {PackageManager pm = context.getPackageManager();PackageInfo info = pm.getPackageArchiveInfo(archiveFilePath, PackageManager.GET_ACTIVITIES);ApplicationInfo appInfo = info.applicationInfo;appInfo.sourceDir = archiveFilePath;appInfo.publicSourceDir = archiveFilePath;return appInfo.loadIcon(pm);}