gson.fromJson StackOverFlowError

Question

I don't know why it doesn't work, I think I'm doing it correctly.

Error

10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime: FATAL EXCEPTION: main
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime: Process: com.imaginarv.launcher, PID: 11957
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime: java.lang.StackOverflowError
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:383)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:378)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:383)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:378)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:383)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:378)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:383)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:378)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:383)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:378)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:383)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:378)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:383)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:378)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:383)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:378)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:383)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:378)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:383)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:378)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:383)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:378)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:383)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:378)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:383)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:378)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:383)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:378)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:383)
10-29 09:22:48.995 11957-11957/com.imaginarv.launcher E/AndroidRuntime:     at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:378)

apps.json

This file is stored on assets/apps.json. I checked it on http://jsonviewer.stack.hu/.

[
  {
    "name": "Carpeta 1",
    "packages": [
      "com.mobilendo.app1",
      "com.mobilendo.app2"
    ]
  },
  {
    "name": "Carpeta 2",
    "packages": [
      "com.mobilendo.app1",
      "com.mobilendo.app2"
    ]
  }
]

Functions

Functions to read the JSon from apps.json and parse it.

private ArrayList<FolderModel> getFolders() {
    String jsonString = loadJSONFromAsset();
    Gson gson = new Gson();
    ArrayList<FolderModel> foldersList;
    foldersList = gson.fromJson(jsonString, new TypeToken<ArrayList<FolderModel>>(){}.getType());

    return foldersList;
}

public String loadJSONFromAsset() {
    StringBuilder buf = new StringBuilder();
    try {
        InputStream json = getAssets().open("apps.json");
        BufferedReader in = new BufferedReader(new InputStreamReader(json, "UTF-8"));
        String str;
        while ((str = in.readLine()) != null) {
            buf.append(str);
        }
        in.close();
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
    return buf.toString();
}

FolderModel

public class FolderModel {
    @SerializedName("name")
    private String name;

    @SerializedName("packages")
    private ArrayList<String> packages;

    @SerializedName("apps")
    private ArrayList<AppModel> apps;

    @SerializedName("icon")
    private Drawable icon;

    public FolderModel(String name, ArrayList<String> packages) {
        this.name = name;
        this.packages = packages;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public ArrayList<String> getPackages() {
        return packages;
    }

    public void setPackages(ArrayList<String> packages) {
        this.packages = packages;
    }

    public ArrayList<AppModel> getApps() {
        return apps;
    }

    public void setApps(ArrayList<AppModel> apps) {
        this.apps = apps;
    }

    public Drawable getIcon() {
        return icon;
    }

    public void setIcon(Drawable icon) {
        this.icon = icon;
    }
}

AppModel

public class AppModel implements Serializable {
    private final Context mContext;
    private final ApplicationInfo mInfo;

    private String mAppLabel;
    private Drawable mIcon;

    private boolean mMounted;
    private final File mApkFile;

    public AppModel(Context context, ApplicationInfo info) {
        mContext = context;
        mInfo = info;

        mApkFile = new File(info.sourceDir);
    }

    public ApplicationInfo getAppInfo() {
        return mInfo;
    }

    public String getApplicationPackageName() {
        return getAppInfo().packageName;
    }

    public String getLabel() {
        return mAppLabel;
    }

    public Drawable getIcon() {
        if (mIcon == null) {
            if (mApkFile.exists()) {
                mIcon = mInfo.loadIcon(mContext.getPackageManager());
                return mIcon;
            } else {
                mMounted = false;
            }
        } else if (!mMounted) {
            // If the app wasn't mounted but is now mounted, reload
            // its icon.
            if (mApkFile.exists()) {
                mMounted = true;
                mIcon = mInfo.loadIcon(mContext.getPackageManager());
                return mIcon;
            }
        } else {
            return mIcon;
        }

        return mContext.getResources().getDrawable(android.R.drawable.sym_def_app_icon);
    }


    public void loadLabel(Context context) {
        if (mAppLabel == null || !mMounted) {
            if (!mApkFile.exists()) {
                mMounted = false;
                mAppLabel = mInfo.packageName;
            } else {
                mMounted = true;
                CharSequence label = mInfo.loadLabel(context.getPackageManager());
                mAppLabel = label != null ? label.toString() : mInfo.packageName;
            }
        }
    }
}

Answer 1

Try something like this:

JSONArray list;
list = new JSONArray(jsonString);
                foldersList = new ArrayList<FolderModel>();
                FolderModel f;
                for (int i = 1; i < list.length(); ++i) {
                    f=new FolderModel();
                    JSONObject obj = list.getJSONObject(i);

                    f.setName(obj.getString("name").toString());
                }

Answer 2

我通常使用另一种方式来解析：

 FolderModel[] arrayModels = gson.fromJson(jsonString, FolderModel[].class);

Answer 3

Remove the Drawable object from FolderModel and from AppModel and save it as an id or image url. The Drawables are not serializable clases and it's expensive to keep them in memory.