使用Array列表创建JSON文件时出现问题

Question

I'm creating a function which retrieves the installed apps of the device, the package of the app and the permissions each app has. The problem is that I want to put all of this into a JSON file and I do not know how to do it, here it is what I programmed, but it doesn't work, please, if someone know something, help, it is very important for me! Thanks in advance.

public static void installedApps(Context context) throws IOException{

    PackageManager pm = context.getPackageManager();
    List<ApplicationInfo> packagelist = pm.getInstalledApplications(PackageManager.GET_META_DATA);

    CharSequence app;
    String pckge;
    String[] permissions;

    for (ApplicationInfo applicationInfo : packagelist){

        app = applicationInfo.loadLabel(context.getPackageManager());
        pckge = applicationInfo.packageName;

        JSONObject json = new JSONObject();

        Log.d("test", "App: "+ applicationInfo.loadLabel(context.getPackageManager()) +", Package: " + applicationInfo.packageName);

        try{
            PackageInfo packageInfo = pm.getPackageInfo(applicationInfo.packageName, PackageManager.GET_PERMISSIONS);

            //Get Permissions
            String[] requestedPermissions = packageInfo.requestedPermissions;

            if(requestedPermissions != null){
                for (int i = 0; i < requestedPermissions.length; i++){

                    Log.d("test", requestedPermissions[i]);

                    permissions = requestedPermissions;

                    JSONArray jsonArray = new JSONArray();

                    try{
                        json.put("app", app);
                        json.put("package", pckge);

                        jsonArray.put(Integer.parseInt("permission"), permissions);


                    }catch (JSONException e) {
                        e.printStackTrace();
                    }


                }
            }
            //primero cargar en un array todos los datos, y pasarlos a un json llamandolos
        }catch (PackageManager.NameNotFoundException e){
            e.printStackTrace();
        }

    }
}

Answer 1

I would probably go for something like this:

public static void installedApps(Context context) {
    PackageManager pm = context.getPackageManager();
    List<ApplicationInfo> packagelist = pm.getInstalledApplications(PackageManager.GET_META_DATA);
    JSONObject resp = new JSONObject();

    for (ApplicationInfo applicationInfo : packagelist) {

        CharSequence app = applicationInfo.loadLabel(context.getPackageManager());
        String pckge = applicationInfo.packageName;
        JSONObject json = new JSONObject();

        try {
            //Get Permissions
            PackageInfo packageInfo = pm.getPackageInfo(applicationInfo.packageName, PackageManager.GET_PERMISSIONS);
            String[] requestedPermissions = packageInfo.requestedPermissions;
            if (requestedPermissions != null) {
                json.put("app", app);
                json.put("package", pckge);
                JSONArray jsonArray = new JSONArray();
                for (String requestedPermission : requestedPermissions) {
                    jsonArray.put(requestedPermission);
                }
                json.put("permission", jsonArray);
                resp.put(applicationInfo.name, json); // something to identify each app
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    // return resp.toString() or store in file or whatever you want to do
}

Answer 2

I am petty sure there is a problem with this line,

permissions = requestedPermissions; 

...

jsonArray.put(Integer.parseInt("permission"), permissions); 

since you define the permissions array at the top, you will see the final requestPermission entry adding to jsonArray over and over packageList.size() times.

bring permission to inside the loop. it will solve your problem.