枚举安装的应用并查询应用的包名和对应的APK文件路径

         //  Iterate Android packages
        List < PackageInfo >  packages  =  getPackageManager().getInstalledPackages(PackageManager.GET_ACTIVITIES  |
                PackageManager.GET_GIDS  |  PackageManager.GET_CONFIGURATIONS  |
                PackageManager.GET_INSTRUMENTATION  |  PackageManager.GET_PERMISSIONS  |
                PackageManager.GET_PROVIDERS  |  PackageManager.GET_RECEIVERS  |
                PackageManager.GET_SERVICES  |  PackageManager.GET_SIGNATURES);
         for  ( int  i  =   0 ; i  <  packages.size(); i ++ ) {
            PackageInfo package_info  =  packages.get(i);
            String package_name  =  package_info.packageName;
            package_name  =  package_name.trim().toLowerCase();
            Log.i(TAG,  " Got package:  "   +  package_name);
             try  {
                ApplicationInfo app_info  =  getPackageManager().getApplicationInfo(package_name,
                        PackageManager.GET_META_DATA  |  PackageManager.GET_SHARED_LIBRARY_FILES);
                Log.i(TAG,  " Package apk file path:  "   +  app_info.sourceDir);
            }  catch  (NameNotFoundException e) {
                e.printStackTrace();
            }
        }

 

当然，也可以硬来：

//  Iterate folder, this needs "root" privilege
File root_dir  =   new  File( " /data/app " );
File[] files  =  root_dir.listFiles();
for  ( int  i  =   0 ; i  <  files.length; i ++ ) {
     if  (files[i].isFile()) {
        String filename  =  files[i].getName();
        filename  =  filename.trim().toLowerCase();
        Log.i(TAG,  " Got file under /data/app:  "   +  filename);

 

直接遍历/data/app或者/system/app目录。不过这就需要root权限，而且能取到的信息远远少于使用PackageManager。