CODEWITHSUNDEEP
android
Thomas
Thomas

Reputation: 8930

Android's view not refreshing

In a thread when I receive something from internet I want to notify the user and I do something like

new Thread(new Runnable(...
   ...
   Log.d("tag", "going to redraw");
   findViewById(R.id.view).setVisibility(View.VISIBLE);
   findViewById(R.id.view).refreshDrawableState();  // tried this
   findViewById(R.id.view).invalidate();  // and this together and separately
 ).start();

I always see the log, and sometimes see the view shown. I have no idea what's going on

I have tried to include the findViewById in a runOnUIThread but that didn't do the job either. Any tip on this ?

Upvotes: 1

Views: 2600

Answers (2)

SimonSays
SimonSays

Reputation: 10977

Do not modify the UI in a Thread other than the UI Thread! Either use a Handler or Activity.runOnUiThread()

Upvotes: 4

codeMagic
codeMagic

Reputation: 44571

When you are not on the main Thread you need to use postInvalidate() on the View instead of invalidate()

From the docs

Cause an invalidate to happen on a subsequent cycle through the event loop. Use this to invalidate the View from a non-UI thread.

From the docs for invalidate()

This must be called from a UI thread.

Upvotes: 0

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