in rerofit i coundn't print JSON

Issue

In this code I will send id and mobile_no it retrieve me balance of user but it couldn't print in a Toast.

What am I missing here my work properly but I don't get response string

private void Get_Wallet_Amount() {
       Call<ResponseBody> call = AppController.getInstance().getApiInterface().getWalle_Data(Utils.getSharedPreference(getApplicationContext()).getString(Const.PREFERENCE_USER_ID,""),
               Utils.getSharedPreference(getApplicationContext()).getString(Const.PREFERENCE_MOBILE_NUMBER,""));
        call.enqueue(new Callback<ResponseBody>() {
            @Override
            public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
                String responseString = null;
                try {
                    Toast.makeText(Proceed_PaymentActivity.this, "HI", Toast.LENGTH_SHORT).show();
                    responseString = response.body().string();
                    JSONObject jsonObject = new JSONObject(responseString);
//It doesn't print output

                Toast.makeText(Proceed_PaymentActivity.this, ""+jsonObject.getString("wallet_amt"), Toast.LENGTH_SHORT).show();
             } catch (JSONException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        @Override
        public void onFailure(Call<ResponseBody> call, Throwable t) {
            Toast.makeText(Proceed_PaymentActivity.this, "Error", Toast.LENGTH_SHORT).show();
        }
    });
}

Retrofit Interface

@FormUrlEncoded
@POST("XXXX")
Call<ResponseBody> getWalle_Data(@Field("id") String uid,@Field("mobile") String mobile);

My JSON Output

[
    {
        "wallet_amt": 50
    }
]

Error Logcat org.json.JSONException: Value [{"wallet_amt":50}] of type org.json.JSONArray cannot be converted to JSONObject 10-13 12:39:37.793 28522-28522/abc.example.com.rechargeappdesugn W/System.err: at org.json.JSON.typeMismatch(JSON.java:111) 10-13 12:39:37.793 28522-28522/abc.example.com.rechargeappdesugn W/System.err: at org.json.JSONObject.(JSONObject.java:160) 10-13 12:39:37.793 28522-28522/abc.example.com.rechargeappdesugn W/System.err: at org.json.JSONObject.(JSONObject.java:173) 10-13 12:39:37.793 28522-28522/abc.example.com.rechargeappdesugn W/System.err: at abc.example.com.rechargeappdesugn.activity.Proceed_PaymentActivity$1.onResponse(Proceed_PaymentActivity.java:97) 10-13 12:39:37.793 28522-28522/abc.example.com.rechargeappdesugn W/System.err: at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:68) 10-13 12:39:37.793 28522-28522/abc.example.com.rechargeappdesugn W/System.err: at android.os.Handler.handleCallback(Handler.java:751) 10-13 12:39:37.793 28522-28522/abc.example.com.rechargeappdesugn W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95) 10-13 12:39:37.793 28522-28522/abc.example.com.rechargeappdesugn W/System.err: at android.os.Looper.loop(Looper.java:154) 10-13 12:39:37.793 28522-28522/abc.example.com.rechargeappdesugn W/System.err: at android.app.ActivityThread.main(ActivityThread.java:6119) 10-13 12:39:37.793 28522-28522/abc.example.com.rechargeappdesugn W/System.err: at java.lang.reflect.Method.invoke(Native Method) 10-13 12:39:37.793 28522-28522/abc.example.com.rechargeappdesugn W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 10-13 12:39:37.794 28522-28522/abc.example.com.rechargeappdesugn W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

Solution

Your json is JSONArray .

Use JSONArray jsonArray = new JSONArray(responseString); in your code .

you have to use getString() instead of opString().

@Override
public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
    String responseString = null;
    try {
        Toast.makeText(Proceed_PaymentActivity.this, "HI", Toast.LENGTH_SHORT).show();
        responseString = response.body().string();
        // edited here
        JSONArray jsonArray = new JSONArray(responseString);
        for (int i = 0; i < jsonArray.length(); i++) {
            JSONObject jsonObject = jsonArray.getJSONObject(i);
            String wallet_amt = jsonObject.String("wallet_amt");
            Toast.makeText(Proceed_PaymentActivity.this, wallet_amt, Toast.LENGTH_SHORT).show();
        }
    } catch (JSONException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

Answered By - KeLiuyue