How to return JSONObject from doInBackground() method to onPostExecute() method on AsyncTask?

Question

In Android app i want to return JSONObject from doInBackground() method to onPostExecute() method.
Here is the code:

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Answer 1

For AsyncTask<T1, T2, T3> pass T3 as JSONObject

Answer 2

Edited:

This could Help you,

private class AddAsyncTask extends AsyncTask<String, Void, JSONOnject>
 {
     JSONObject jsonObjRecv;
     String result;

@Override
protected JSONObject doInBackground(String... params) {
    AssetObj assetObj = new AssetObj();
    assetObj.setAssetName(txtname.getText().toString());
    assetObj.setMobileNo(txtmobile.getText().toString());
    assetObj.setOwnerId(myApp.getOwnerId());
    assetObj.setStartTime(startTime.getText().toString());
    assetObj.setEndTime(endTime.getText().toString());
    assetObj.setInterval(interval.getText().toString());
    JSONObject jsonObjRecv = SyncService.AddNewAssetRequest(assetObj);
 }
 protected void onPostExecute(JSONObject obj){
            if(obj != null)
            {
                //do something
            }

Here is it clearly ,

private class AddAsyncTask extends AsyncTask<What type of input you need to pass to doInBackground(), Void, What type of return value you need to return to onPostExcute()>

Probably you dont need to change return values and params in the method declaration.

Just create the following line

private class AddAsyncTask extends AsyncTask<String, Void, JSONOnject>

the methods will be created automatically according to the params and return types you mentioned in

private class AddAsyncTask extends AsyncTask<String, Void, JSONOnject>

Answer 3

Instead of

private class AddAsyncTask extends AsyncTask<String, Void, String>

change to

private class AddAsyncTask extends AsyncTask<String, Void, JsonObject>

The Actual Code

private class AddAsyncTask extends AsyncTask<String, Void, JSONOnject>
 {
     JSONObject jsonObjRecv;
     String result;

@Override
protected JSONObject doInBackground(JSONObject... params) {
    AssetObj assetObj = new AssetObj();
    assetObj.setAssetName(txtname.getText().toString());
    assetObj.setMobileNo(txtmobile.getText().toString());
    assetObj.setOwnerId(myApp.getOwnerId());
    assetObj.setStartTime(startTime.getText().toString());
    assetObj.setEndTime(endTime.getText().toString());
    assetObj.setInterval(interval.getText().toString());
    JSONObject jsonObjRecv = SyncService.AddNewAssetRequest(assetObj);
 }
 protected void onPostExecute(JSONObject obj){
            if(obj != null)
            {
                //do something
            }
}
}

AsyncTask < Params, Progress, Result >

1. Params, the type of the parameters sent to the task upon execution.
2. Progress, the type of the progress units published during the background computation.
3. Result, the type of the result of the background computation

Answer 4

OK, Now look at this carefully,

private class AddAsyncTask extends AsyncTask<String, Void, String>

In your AsyncTask third Parameter is String So change it to JSONObject .

like,

private class AddAsyncTask extends AsyncTask<String, Void, JSONObject>