获取SD卡上 未安装 APK文件信息

1./** 
2.     * 获取未安装的apk信息 
3.     *  
4.     * @param ctx 
5.     * @param apkPath 
6.     * @return 
7.     */  
8.    public static AppInfoData getApkFileInfo(Context ctx, String apkPath) {  
9.        System.out.println(apkPath);  
10.        File apkFile = new File(apkPath);  
11.        if (!apkFile.exists() || !apkPath.toLowerCase().endsWith(".apk")) {  
12.            System.out.println("文件路径不正确");  
13.            return null;  
14.        }  
15.        AppInfoData appInfoData;  
16.        String PATH_PackageParser = "android.content.pm.PackageParser";  
17.        String PATH_AssetManager = "android.content.res.AssetManager";  
18.        try {  
19.            //反射得到pkgParserCls对象并实例化,有参数  
20.            Class<?> pkgParserCls = Class.forName(PATH_PackageParser);  
21.            Class<?>[] typeArgs = {String.class};  
22.            Constructor<?> pkgParserCt = pkgParserCls.getConstructor(typeArgs);  
23.            Object[] valueArgs = {apkPath};  
24.            Object pkgParser = pkgParserCt.newInstance(valueArgs);  
25.              
26.            //从pkgParserCls类得到parsePackage方法  
27.            DisplayMetrics metrics = new DisplayMetrics();  
28.            metrics.setToDefaults();//这个是与显示有关的, 这边使用默认  
29.            typeArgs = new Class<?>[]{File.class,String.class,  
30.                                    DisplayMetrics.class,int.class};  
31.            Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod(  
32.                    "parsePackage", typeArgs);  
33.              
34.            valueArgs=new Object[]{new File(apkPath),apkPath,metrics,0};  
35.              
36.            //执行pkgParser_parsePackageMtd方法并返回  
37.            Object pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser,  
38.                    valueArgs);  
39.              
40.            //从返回的对象得到名为"applicationInfo"的字段对象    
41.            if (pkgParserPkg==null) {  
42.                return null;  
43.            }  
44.            Field appInfoFld = pkgParserPkg.getClass().getDeclaredField(  
45.                    "applicationInfo");  
46.              
47.            //从对象"pkgParserPkg"得到字段"appInfoFld"的值  
48.            if (appInfoFld.get(pkgParserPkg)==null) {  
49.                return null;  
50.            }  
51.            ApplicationInfo info = (ApplicationInfo) appInfoFld  
52.                    .get(pkgParserPkg);           
53.              
54.            //反射得到assetMagCls对象并实例化,无参  
55.            Class<?> assetMagCls = Class.forName(PATH_AssetManager);            
56.            Object assetMag = assetMagCls.newInstance();  
57.            //从assetMagCls类得到addAssetPath方法  
58.            typeArgs = new Class[1];  
59.            typeArgs[0] = String.class;  
60.            Method assetMag_addAssetPathMtd = assetMagCls.getDeclaredMethod(  
61.                    "addAssetPath", typeArgs);  
62.            valueArgs = new Object[1];  
63.            valueArgs[0] = apkPath;  
64.            //执行assetMag_addAssetPathMtd方法  
65.            assetMag_addAssetPathMtd.invoke(assetMag, valueArgs);  
66.              
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  
75.                    .getConstructor(typeArgs);  
76.            valueArgs = new Object[3];  
77.            valueArgs[0] = assetMag;  
78.            valueArgs[1] = res.getDisplayMetrics();  
79.            valueArgs[2] = res.getConfiguration();  
80.            res = (Resources) resCt.newInstance(valueArgs);  
81.              
82.              
83.            // 读取apk文件的信息  
84.            appInfoData = new AppInfoData();  
85.            if (info!=null) {  
86.                if (info.icon != 0) {// 图片存在，则读取相关信息  
87.                    Drawable icon = res.getDrawable(info.icon);// 图标  
88.                    appInfoData.setAppicon(icon);  
89.                    }  
90.                if (info.labelRes != 0) {  
91.                    String neme = (String) res.getText(info.labelRes);// 名字  
92.                    appInfoData.setAppname(neme);  
93.                }else {  
94.                    String apkName=apkFile.getName();  
95.                    appInfoData.setAppname(apkName.substring(0,apkName.lastIndexOf(".")));  
96.                }  
97.                String pkgName = info.packageName;// 包名           
98.                appInfoData.setApppackage(pkgName);  
99.            }else {  
100.                return null;  
101.            }             
102.            PackageManager pm = ctx.getPackageManager();  
103.            PackageInfo packageInfo = pm.getPackageArchiveInfo(apkPath, PackageManager.GET_ACTIVITIES);  
104.            if (packageInfo != null) {  
105.                appInfoData.setAppversion(packageInfo.versionName);//版本号  
106.                appInfoData.setAppversionCode(packageInfo.versionCode+"");//版本码  
107.            }  
108.            return appInfoData;  
109.        } catch (Exception e) {   
110.            e.printStackTrace();  
111.        }  
112.        return null;  
113.    }