获取SD卡上 未安装 APK文件 的图标等
各版本通用

/** * 获取未安装的apk信息 *  * @param ctx * @param apkPath * @return */public static AppInfoData getApkFileInfo(Context ctx, String apkPath) {System.out.println(apkPath);File apkFile = new File(apkPath);if (!apkFile.exists() || !apkPath.toLowerCase().endsWith(".apk")) {System.out.println("文件路径不正确");return null;}AppInfoData appInfoData;String PATH_PackageParser = "android.content.pm.PackageParser";String PATH_AssetManager = "android.content.res.AssetManager";try {//反射得到pkgParserCls对象并实例化,有参数Class<?> pkgParserCls = Class.forName(PATH_PackageParser);Class<?>[] typeArgs = {String.class};Constructor<?> pkgParserCt = pkgParserCls.getConstructor(typeArgs);Object[] valueArgs = {apkPath};Object pkgParser = pkgParserCt.newInstance(valueArgs);//从pkgParserCls类得到parsePackage方—isplayMetrics metrics = new DisplayMetrics();metrics.setToDefaults();//这个是与显示有关的, 这边使用默认typeArgs = new Class<?>[]{File.class,String.class,DisplayMetrics.class,int.class};Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod("parsePackage", typeArgs);valueArgs=new Object[]{new File(apkPath),apkPath,metrics,0};//执行pkgParser_parsePackageMtd方法并返回Object pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser,valueArgs);//从返回的对象得到名为"applicationInfo"的字段对象if (pkgParserPkg==null) {return null;}Field appInfoFld = pkgParserPkg.getClass().getDeclaredField("applicationInfo");//从对象"pkgParserPkg"得到字段"appInfoFld"的值if (appInfoFld.get(pkgParserPkg)==null) {return null;}ApplicationInfo info = (ApplicationInfo) appInfoFld.get(pkgParserPkg);//反射得到assetMagCls对象并实例化,无参Class<?> assetMagCls = Class.forName(PATH_AssetManager);Object assetMag = assetMagCls.newInstance();//从assetMagCls类得到addAssetPath方法typeArgs = new Class[1];typeArgs[0] = String.class;Method assetMag_addAssetPathMtd = assetMagCls.getDeclaredMethod("addAssetPath", typeArgs);valueArgs = new Object[1];valueArgs[0] = apkPath;//执行assetMag_addAssetPathMtd方法assetMag_addAssetPathMtd.invoke(assetMag, valueArgs);//得到Resources对象并实例化,有参数Resources res = ctx.getResources();typeArgs = new Class[3];typeArgs[0] = assetMag.getClass();typeArgs[1] = res.getDisplayMetrics().getClass();typeArgs[2] = res.getConfiguration().getClass();Constructor<Resources> 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);// 读取apk文件的信息appInfoData = new AppInfoData();if (info!=null) {if (info.icon != 0) {// 图片存在，则读取相关信息Drawable icon = res.getDrawable(info.icon);// 图标appInfoData.setAppicon(icon);}if (info.labelRes != 0) {String neme = (String) res.getText(info.labelRes);// 名字appInfoData.setAppname(neme);}else {String apkName=apkFile.getName();appInfoData.setAppname(apkName.substring(0,apkName.lastIndexOf(".")));}String pkgName = info.packageName;// 包名appInfoData.setApppackage(pkgName);}else {return null;}PackageManager pm = ctx.getPackageManager();PackageInfo packageInfo = pm.getPackageArchiveInfo(apkPath, PackageManager.GET_ACTIVITIES);if (packageInfo != null) {appInfoData.setAppversion(packageInfo.versionName);//版本号appInfoData.setAppversionCode(packageInfo.versionCode+"");//版本码}return appInfoData;} catch (Exception e) {e.printStackTrace();}return null;}