Update text in a TextView from a Thread

Question

I have added a TextView to a RelativeLayout that I already added a SurfaceView to. I can get the TextView to display text over my SurfaceView.

rl = new RelativeLayout(this);
tv = new TextView(this);
tv.setText(Integer.toString(GameScreen.score));
tv.setTextSize(50);
tv.setPadding(390, 50, 0, 0);
tv.setTextColor(Color.BLACK);
rl.addView(renderView);
rl.addView(tv);
setContentView(rl);

Then in my GameScreen class's update method i put:

game.getTextView().setText(Integer.toString(score));

And it gives me the error:

android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

What can I do to get around this ?

Possible duplicate of [Android - ViewRootImpl$CalledFromWrongThreadException](http://stackoverflow.com/questions/10118301/android-viewrootimplcalledfromwrongthreadexception) — rkosegi, Mar 01 '16 at 06:22
Thanks rkosegi I read it, but the solution from ankit made some sense, but I didn't understand it till @MustansarSaeed explained it — Noitidart, Mar 01 '16 at 06:33
Possible duplicate of [Android update TextView in Thread and Runnable](http://stackoverflow.com/questions/12716850/android-update-textview-in-thread-and-runnable) — OnePunchMan, Mar 01 '16 at 10:34

score 3 · Accepted Answer · answered Mar 01 '16 at 06:28

3

Use the following which is the recommended way to update Widget on UiThread

game.getTextView().post(new Runnable() {
                @Override
                public void run() {
                    game.getTextView().setText(Integer.toString(score));
                }
            });

Hope this helps.

answered Mar 01 '16 at 06:28

Mustansar Saeed

2,730
2
22
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Superb thank you! This worked! It helped me understand the solution by @ankit as well! – Noitidart Mar 01 '16 at 06:34

Ankit Aggarwal · Answer 2 · 2016-03-01T06:28:00.537

1

run your code in the UI thread. You cannot do UI operations from a worker thread.

your_context.runOnUiThread(new Runnable() {
    public void run(){   
        game.getTextView().setText(Integer.toString(score));
    }
});

edited Mar 01 '16 at 06:28

answered Mar 01 '16 at 06:22

Ankit Aggarwal

5,317
2
30
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Thanks for the fast reply, this solution is correct, but didn't make sense to me till I saw @Must solution below. But definitely up vote, thank you very much! – Noitidart Mar 01 '16 at 06:34

Vivek Bhardwaj · Answer 3 · 2016-03-01T06:37:16.367

1

Use this peice of code.. Um sure it will help you out !

private void runThread() {

    new Thread() {
        public void run() {

                try {
                    runOnUiThread(new Runnable() {

                        @Override
                        public void run() {
                           game.getTextView().setText(Integer.toString(score));
                        }
                    });

                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

        }
    }.start();

Let me know if it works! :)

edited Mar 01 '16 at 06:37

answered Mar 01 '16 at 06:34

Vivek Bhardwaj

530
5
16

Thanks Vivek! The solution by @Must below worked but this helps me learn I really appreciate it! – Noitidart Mar 01 '16 at 06:35

Update text in a TextView from a Thread

3 Answers3