Android解析包名信息

[java]
public ApplicationRet.Application getApkFileInfo(Context ctx, String apkPath) {
        File apkFile = new File(apkPath);
        if (!apkFile.exists() || !apkPath.toLowerCase().endsWith(".apk")) {
            return null;
        }
        ApplicationRet.Application 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方法
            DisplayMetrics 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);

补充：移动开发 , Android ,