[Android]教你如何擷取未安裝應用的ResolveInfo，androidresolveinfo

[Android]教你如何擷取未安裝應用的ResolveInfo，androidresolveinfo
原理：查看了下安卓源碼，明白瞭解析過程，只是自己的話就要移植安卓的源碼，有人解析成功了，但是我覺得太麻煩。大概說下安卓的解析過程吧。

    public PackageInfo getPackageArchiveInfo(String archiveFilePath, int flags) {        PackageParser packageParser = new PackageParser(archiveFilePath);        DisplayMetrics metrics = new DisplayMetrics();        metrics.setToDefaults();        final File sourceFile = new File(archiveFilePath);        PackageParser.Package pkg = packageParser.parsePackage(                sourceFile, archiveFilePath, metrics, 0);        if (pkg == null) {            return null;        }        if ((flags & GET_SIGNATURES) != 0) {            packageParser.collectCertificates(pkg, 0);        }        return PackageParser.generatePackageInfo(pkg, null, flags, 0, 0);    }

這裡是源碼，首先通過PackageParser解析，然後通過PackageParser.generatePackageInfo返回PackageInfo，但是PackageInfo裡卻把intent-filter給去掉了，不知道為啥，不過既然知道了這段代碼那麼就好好辦了。那就是通過反射把PackageParser.Package得到，然後再封裝成intentfilter。解決方案：直接上代碼把。因為完全就是通過反射又重寫了一次代碼。

  try {   // 先得到解析類PackageParser並執行個體化   Class packageParserClass = Class.forName("android.content.pm.PackageParser");   Object packageParser = packageParserClass.getConstructor(String.class).newInstance(dexPath);   // 構建參數   DisplayMetrics metrics = new DisplayMetrics();   metrics.setToDefaults();   File sourceFile = new File(dexPath);   // 調用PackageParser的parsePackage解析資料   Method method = packageParserClass.getDeclaredMethod("parsePackage", File.class, String.class, DisplayMetrics.class, int.class);   method.setAccessible(true);   Object Package = method.invoke(packageParser, sourceFile, dexPath, metrics, 0);   // 反射得到結果   Field activities = Package.getClass().getDeclaredField("activities");   activities.setAccessible(true);   ArrayList filters = (ArrayList) activities.get(Package);   for (int i = 0; i < filters.size(); i++) {    Object activity = filters.get(i);    Field intentsField = activity.getClass().getField("intents");    intentsField.setAccessible(true);    ArrayList<IntentFilter> intents = (ArrayList<IntentFilter>) intentsField.get(activity);    for (int j = 0; j < intents.size(); j++) {     if (intents.iterator().hasNext()) {      String actionString = intents.get(0).getAction(0);      String categoryString = intents.get(0).getCategory(0);      System.out.println(actionString + " " + categoryString);     }    }   }  } catch (Exception e) {  }

dexPath就是你要解析的APK的路徑。intentfilter裡有action和category。這樣就實現了得到一個activity的ResolveInfo，至於為什麼要類型轉來轉去，那就具體看安卓源碼吧。