android从未安装的apk文件里获取信息(包信息，资源信息)

下面从一个未安装的android的apk文件获取apk信息
  1 /**   2 * 获取未安装的apk信息   3 *    4 * @param ctx Context  5 * @param apkPath apk路径，可以放在SD卡  6 * @return   7 */    8 public static AppInfoData getApkFileInfo(Context ctx, String apkPath)   9 {   10     System.out.println(apkPath);   11     File apkFile = new File(apkPath);   12     if (!apkFile.exists() || !apkPath.toLowerCase().endsWith(".apk")) 13     {   14         System.out.println("file path is not correct");   15         return null;   16     }   17      18     AppInfoData appInfoData;   19     String PATH_PackageParser = "android.content.pm.PackageParser";   20     String PATH_AssetManager = "android.content.res.AssetManager";   21     try 22     {   23         //反射得到pkgParserCls对象并实例化,有参数   24         Class<?> pkgParserCls = Class.forName(PATH_PackageParser);   25         Class<?>[] typeArgs = {String.class};   26         Constructor<?> pkgParserCt = pkgParserCls.getConstructor(typeArgs);   27         Object[] valueArgs = {apkPath};   28         Object pkgParser = pkgParserCt.newInstance(valueArgs);   29          30         //从pkgParserCls类得到parsePackage方法   31         DisplayMetrics metrics = new DisplayMetrics();   32         metrics.setToDefaults();//这个是与显示有关的, 这边使用默认   33         typeArgs = new Class<?>[]{File.class,String.class,   34         DisplayMetrics.class,int.class};   35         Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod("parsePackage", typeArgs);   36          37         valueArgs=new Object[]{new File(apkPath),apkPath,metrics,0};   38          39         //执行pkgParser_parsePackageMtd方法并返回   40         Object pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser, valueArgs);   41          42         //从返回的对象得到名为"applicationInfo"的字段对象    43         if (pkgParserPkg==null) 44         {   45             return null;   46         }   47         Field appInfoFld = pkgParserPkg.getClass().getDeclaredField("applicationInfo");   48          49         //从对象"pkgParserPkg"得到字段"appInfoFld"的值   50         if (appInfoFld.get(pkgParserPkg)==null) 51         {   52             return null;   53         }   54         ApplicationInfo info = (ApplicationInfo) appInfoFld.get(pkgParserPkg);      55          56         //反射得到assetMagCls对象并实例化,无参   57         Class<?> assetMagCls = Class.forName(PATH_AssetManager);      58         Object assetMag = assetMagCls.newInstance();   59         //从assetMagCls类得到addAssetPath方法   60         typeArgs = new Class[1];   61         typeArgs[0] = String.class;   62         Method assetMag_addAssetPathMtd = assetMagCls.getDeclaredMethod("addAssetPath", typeArgs);   63         valueArgs = new Object[1];   64         valueArgs[0] = apkPath;   65         //执行assetMag_addAssetPathMtd方法   66         assetMag_addAssetPathMtd.invoke(assetMag, valueArgs);   67          68         //得到Resources对象并实例化,有参数   69         Resources res = ctx.getResources();   70         typeArgs = new Class[3];   71         typeArgs[0] = assetMag.getClass();   72         typeArgs[1] = res.getDisplayMetrics().getClass();   73         typeArgs[2] = res.getConfiguration().getClass();   74         Constructor<Resources> resCt = Resources.class.getConstructor(typeArgs);   75         valueArgs = new Object[3];   76         valueArgs[0] = assetMag;   77         valueArgs[1] = res.getDisplayMetrics();   78         valueArgs[2] = res.getConfiguration();   79         //这个是重点 80         //得到Resource对象后可以有很多用处 81         res = (Resources) resCt.newInstance(valueArgs);   82          83         // 读取apk文件的信息   84         appInfoData = new AppInfoData();   85         if (info!=null) 86         {   87             if (info.icon != 0)  88             { 89                 // 图片存在，则读取相关信息   90                 Drawable icon = res.getDrawable(info.icon);// 图标   91                 appInfoData.setAppicon(icon);   92             }   93             if (info.labelRes != 0)  94             {   95                 String neme = (String) res.getText(info.labelRes);// 名字   96                 appInfoData.setAppname(neme);   97             }else  98             {   99                 String apkName=apkFile.getName();  100                 appInfoData.setAppname(apkName.substring(0,apkName.lastIndexOf(".")));  101             }  102             String pkgName = info.packageName;// 包名     103             appInfoData.setApppackage(pkgName);  104         }105         else 106         {  107             return null;  108         }     109         PackageManager pm = ctx.getPackageManager();  110         PackageInfo packageInfo = pm.getPackageArchiveInfo(apkPath, PackageManager.GET_ACTIVITIES);  111         if (packageInfo != null)112         {  113             appInfoData.setAppversion(packageInfo.versionName);//版本号  114             appInfoData.setAppversionCode(packageInfo.versionCode+"");//版本码  115         }  116         return appInfoData;  117     } catch (Exception e)118     {   119         e.printStackTrace();  120     }  121     return null;  122 }
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