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.    }