Android activity is too busy to set TextView text?

Question

i have a function that fill up my SQLite DB with entries of a http query:

try {
        stringEntity = new StringEntity(SQL);
        httpPost.setEntity(stringEntity);
        httpResponse = httpClient.execute(httpPost);
        httpEntity = httpResponse.getEntity();
        bos = new ByteArrayOutputStream();
        httpEntity.writeTo(bos);

        data = bos.toString();

        reader = new BufferedReader(
                  new StringReader(data));

        try {
            //SAVE DATA IN MY DB || WORKS
        } catch(IOException e) {
          e.printStackTrace();
        }

    } catch (IOException e3) {
        // TODO Auto-generated catch block
        e3.printStackTrace();
    }

What i try to do is to set the text of an textview on my activity before the procedure starts (in front of the first "try{.." in my code i postet). but the text won't change, because my activity is too busy to get the data ( i think.I have no other explanation..)

any suggestions?

thanks, prexx

UPDATE '' Get data from AsyncTask ''

 txtAction.setText("Loading...");

    AsyncTask<String, String, String> test = new cAsyncTask();

    try {
        data = test.execute(URL).get();

        reader = new BufferedReader(
                  new StringReader(data));

        while ((line = reader.readLine()) != null) {
            //SAVE DATA IN DB || WORKS
            }
        }

    } catch(IOException e) {
      e.printStackTrace();
    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (ExecutionException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

My Async Task:

class cAsyncTask extends AsyncTask<String, String, String> {

protected String doInBackground(String... urls) {
    int count = urls.length;
    String data = "";
    DefaultHttpClient httpClient = new DefaultHttpClient();
    HttpPost httpPost;
    StringEntity stringEntity;
    HttpResponse httpResponse;
    HttpEntity httpEntity;
    ByteArrayOutputStream bos;
    String line;
    BufferedReader reader;
    for (int i = 0; i < count; i++) {
        httpPost = new HttpPost(urls[i].toString());
        try {
            stringEntity = new StringEntity(SQL);
            httpPost.setEntity(stringEntity);
            httpResponse = httpClient.execute(httpPost);
            httpEntity = httpResponse.getEntity();
            bos = new ByteArrayOutputStream();
            httpEntity.writeTo(bos);

            data = bos.toString();

        } catch (IOException e3) {
            // TODO Auto-generated catch block
            e3.printStackTrace();
        }
    }
    return data;
}

protected void onProgressUpdate(String... progress) {

}

protected void onPostExecute(String result) {
    String test = result;
}

Answer 1

Put the busy part of your code into a separated Thread.

Look at the AsyncTask utility

Call AsyncTask.execute() just after textview.setText("foo") and u will be fine :)

Regards

UPDATE with code sample:

 txtAction.setText("Loading...");
 AsyncTask<String, String, String> test = new cAsyncTask();
 test.execute("http://...");

class cAsyncTask extends AsyncTask<String, String, String> {

protected String doInBackground(String... urls) {
    int count = urls.length;
    String data = "";
    DefaultHttpClient httpClient = new DefaultHttpClient();
    HttpPost httpPost;
    StringEntity stringEntity;
    HttpResponse httpResponse;
    HttpEntity httpEntity;
    ByteArrayOutputStream bos;
    String line;
    BufferedReader reader;
    for (int i = 0; i < count; i++) {
        httpPost = new HttpPost(urls[i].toString());
        try {
            stringEntity = new StringEntity(SQL);
            httpPost.setEntity(stringEntity);
            httpResponse = httpClient.execute(httpPost);
            httpEntity = httpResponse.getEntity();
            bos = new ByteArrayOutputStream();
            httpEntity.writeTo(bos);

            data = bos.toString();

        } catch (IOException e3) {
            // TODO Auto-generated catch block
            e3.printStackTrace();
        }
    }
     reader = new BufferedReader(
                  new StringReader(data));
       String line = "";
        while ((line = reader.readLine()) != null) {
            //SAVE DATA IN DB || WORKS
     }
    return data;
}


protected void onPostExecute(String result) {
    String test = result;
   textView.setText("Done!");
}

}

The key is to put all busy code into the doInBackGround method which will runs in a separate thread. All UI modification must be in the same UI thread and this could be done into the onPostExecute method which will be executed in the same UI thread