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);

}