获取未安装apk文件信息

final PackageManager pm = mContext.getPackageManager();

PackageInfo packageInfo = pm.getPackageArchiveInfo(fullPath, 0);//fullPath 为apk文件路径

Resources activityRes = mContext.getResources();

AssetManager assmgr = new AssetManager();

assmgr.addAssetPath(fullPath);//fullPath 为apk文件路径

Resources apkRes = new Resources(assmgr, 
activityRes .getDisplayMetrics(), 
activityRes .getConfiguration());

String label;Drawable icon;String packageName;

label = apkRes .getText(packageInfo.applicationInfo.labelRes).toString();//有可能为空

icon = apkRes .getDrawable(packageInfo.applicationInfo.icon);

packageName = packageInfo.packageName