How To Update Ui From Background Task

My app is not working on android version 4.1 gives exception like android.os.NetworkOnMainThreadException i have search on stackoverflow advice me to do network thread in backgroun

Solution 1:

Use the Handler object from your MainActivity and post a runnable. To use it from the backgrund you need to make the object a static that you can call outside of your MainActivity or you can create a static instance of the Activity to access it.

Inside the Activity

privatestatic Handler handler;


    handler = new Handler();

    handler().post(new Runnable() {

        publicvoidrun() {
            //ui stuff here :)
        }
    });

    publicstatic Handler getHandler() {
       return handler;
    }

Outside the Activity

    MainActivity.getHandler().post(new Runnable() {

            publicvoidrun() {
                //ui stuff here :)
            }
        });

Solution 2:

You can use **runOnUiThread()** like this:

try {
   // code runs in a thread
   runOnUiThread(newRunnable() {
       @Overridepublicvoidrun() {

         // YOUR CODE

       }
  });
} catch (final Exception ex) {
     Log.i("---","Exception in thread");
}

Solution 3:

You need to create AsyncTask class and use it Read here more: AsyncTask

Example would look like this:

privateclassUploadTaskextendsAsyncTask<Void, Void, Void>
{
    privateStringin;

    publicUploadTask(String input)
    {
        this.in = input;
    }

    @OverrideprotectedvoidonPreExecute()
    {
        //start showing progress here
    }

    @OverrideprotectedVoiddoInBackground(Void... params)
    {
      //do your workreturnnull;
    }

    @OverrideprotectedvoidonPostExecute(Void result)
    {
        //stop showing progress here
    }

}

And start task like this:

UploadTask ut= new UploadTask(input); ut.execute();

Solution 4:

you are handling ui in these methods

public View createRow(JSONObject item)throws JSONException {
    Viewrow= getLayoutInflater().inflate(R.layout.rows, null);
    ((TextView) row.findViewById(R.id.localTime)).setText(item
            .getString("qty"));
    ((TextView) row.findViewById(R.id.apprentTemp)).setText(item
            .getString("name"));

    return row;
}

public View createRow2(JSONObject item)throws JSONException {

    Viewrow2= getLayoutInflater().inflate(R.layout.row2, null);
    ((TextView) row2.findViewById(R.id.name)).setText(item
            .getString("name"));
    ((TextView) row2.findViewById(R.id.subingredients)).setText(item
            .getString("sub_ingredients"));

    return row2;
}

which are called in background thread

if possible do it in onPostExecute or you can use runOnUiThread and Handler.