How to settext Textview in another Thread? (Android)

Question

I have a TCP Client running in a Thread. Now I am getting Messages from the TCP Server. The Messages are saved as an int variable.

At the Moment I am using prinln method to see the Messages.

But I would like to Show that on the GUI. How can I do that?

use runonuithread method to access UI from thread or use handler messages to do so. — Amrut Bidri, Nov 24 '16 at 07:26
Yes I tried googling and I also tried several Solutions here on stackoverflow but didn't work yet. — mosambers, Nov 24 '16 at 07:28
Please take a look at the [answer](http://stackoverflow.com/a/40781231/4770877) — yoAlex5, Nov 24 '16 at 08:36
Please take a look at the [answer](http://stackoverflow.com/a/40781231/4770877) — yoAlex5, Nov 24 '16 at 08:49

score 0 · Answer 1 · edited May 23 '17 at 12:13

0

There are many ways to do this. One simple way of doing this is as-

new Handler().post(new Runnable() {
    @Override
    public void run() {
        // Code here will run in UI thread
    }
});

for more info see this Android basics: running code in the UI thread

edited May 23 '17 at 12:13

Community

1
1

answered Nov 24 '16 at 07:27

Vikash Kumar Verma

1,068
2
14
30

Where to use? It works in my TCP run() but not ouside of it.. – mosambers Nov 24 '16 at 07:56
you can write above code inside run() method. Post you code so that i can explain better. – Vikash Kumar Verma Nov 24 '16 at 11:13

score 0 · Answer 2 · answered Nov 24 '16 at 07:28

0

Use runOnUiThread and call setText inside.

runOnUiThread(new Runnable() {
           @Override
               public void run() {
                   a.setText("text");
         }
 });

answered Nov 24 '16 at 07:28

DAVIDBALAS1

484
10
31

score 0 · Answer 3 · edited May 23 '17 at 12:24

To update UI from thread .

you can use runOnUiThread as DAVIDBALAS1 told you

also you can use handler as Vikash Kumar Verma told you you can also send data by useing sendMessage() to handle like

new Thread(new Runnable() {
    @Override
    public void run() {

        final Message msg = new Message();
        final Bundle b = new Bundle();
        b.putInt("KEY", value);
        msg.setData(b);
        handler.sendMessage(msg);    
    }
).start();




// Handle Message in handleMessage method of your controller (e.g. on UI      thread)
handler = new Handler() { 
    @Override
    public void handleMessage(Message msg) {
        Bundle b = msg.getData();
        Integer value = b.getInt("KEY");

        textView.setText(""+value );
    }
};

you can use asynctask like

private class LongOperation extends AsyncTask {

@Override
protected String doInBackground(String... params) {
    for (int i = 0; i < 5; i++) {
        try {

       //Perform long running task here and 
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            Thread.interrupted();
        }
    }
    return "Executed";
}

@Override
protected void onPostExecute(String result) {

    //here you can update UI this work on UI thread
    TextView txt = (TextView) findViewById(R.id.output);
    txt.setText("Executed"); // txt.setText(result);
    // might want to change "executed" for the returned string passed
    // into onPostExecute() but that is upto you
}

@Override
protected void onPreExecute() {}

@Override
protected void onProgressUpdate(Void... values) {}

}

you can also use BroadcastReceiver to update UI (mostly used in service to update UI from service) As explain by my this friend - https://stackoverflow.com/a/14648933/4741746

How to settext Textview in another Thread? (Android)

3 Answers3