JsonUtils.java

import android.os.Bundle;
import android.os.Parcelable;
import android.support.annotation.Nullable;
import android.util.Size;
import android.util.SizeF;
import android.util.SparseArray;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.Map;

/**
 * Created by cattaka on 2017/01/04.
 */

public class JsonUtils {
    @Nullable
    public static JSONObject toJsonObject(@Nullable Bundle bundle) throws JSONException {
        if (bundle == null) {
            return null;
        }
        JSONObject result = new JSONObject();
        for (String key : bundle.keySet()) {
            result.put(key, toJsonValue(bundle.get(key)));
        }
        return result;
    }

    @Nullable
    public static JSONObject toJsonObject(@Nullable SparseArray sparseArray) throws JSONException {
        if (sparseArray == null) {
            return null;
        }
        JSONObject result = new JSONObject();
        for (int i = 0; i < sparseArray.size(); i++) {
            int key = sparseArray.keyAt(i);
            result.put(String.valueOf(key), toJsonValue(sparseArray.get(key)));
        }
        return result;
    }

    @Nullable
    public static JSONObject toJsonObject(@Nullable Map<?, ?> map) throws JSONException {
        if (map == null) {
            return null;
        }
        JSONObject result = new JSONObject();
        for (Map.Entry<?, ?> entry : map.entrySet()) {
            result.put(String.valueOf(entry.getKey()), toJsonValue(entry.getValue()));
        }
        return result;
    }

    private static Object toJsonValue(Object obj) throws JSONException {
        if (obj instanceof byte[]) {
            JSONArray array = new JSONArray();
            for (byte v : ((byte[]) obj)) {
                array.put(v);
            }
            return array;
        } else if (obj instanceof char[]) {
            JSONArray array = new JSONArray();
            for (char v : ((char[]) obj)) {
                array.put(v);
            }
            return array;
        } else if (obj instanceof String[]) {
            JSONArray array = new JSONArray();
            for (String v : ((String[]) obj)) {
                array.put(v);
            }
            return array;
        } else if (obj instanceof CharSequence[]) {
            JSONArray array = new JSONArray();
            for (CharSequence v : ((CharSequence[]) obj)) {
                array.put(v);
            }
            return array;
        } else if (obj instanceof float[]) {
            JSONArray array = new JSONArray();
            for (float v : ((float[]) obj)) {
                array.put(v);
            }
            return array;
        } else if (obj instanceof short[]) {
            JSONArray array = new JSONArray();
            for (short v : ((short[]) obj)) {
                array.put(v);
            }
            return array;
        } else if (obj instanceof int[]) {
            JSONArray array = new JSONArray();
            for (int v : ((int[]) obj)) {
                array.put(v);
            }
            return array;
        } else if (obj instanceof ArrayList) {
            JSONArray array = new JSONArray();
            for (Object v : ((ArrayList) obj)) {
                array.put(toJsonValue(v));
            }
            return array;
        } else if (obj instanceof Parcelable[]) {
            JSONArray array = new JSONArray();
            for (Parcelable v : ((Parcelable[]) obj)) {
                array.put(toJsonValue(v));
            }
            return array;
        } else if (obj instanceof Size) {
            JSONObject v = new JSONObject();
            v.put("width", ((Size) obj).getWidth());
            v.put("height", ((Size) obj).getHeight());
            return v;
        } else if (obj instanceof SizeF) {
            JSONObject v = new JSONObject();
            v.put("width", ((SizeF) obj).getWidth());
            v.put("height", ((SizeF) obj).getHeight());
            return v;
        } else if (obj instanceof SparseArray) {
            return toJsonObject((SparseArray) obj);
        } else if (obj instanceof Map) {
            return toJsonObject((Map) obj);
        } else if (obj instanceof Bundle) {
            return toJsonObject((Bundle) obj);
        } else if (obj instanceof CharSequence) {
            return obj;
        } else if (obj instanceof Number) {
            return obj;
        } else if (obj == null) {
            return null;
        } else {
            return String.valueOf(obj);
        }
    }
}