CODEWITHSUNDEEP
android
Ali Behzadian Nejad
Ali Behzadian Nejad

Reputation: 9044

Android: Update UI periodically from a thread

Guess that I have a TextView that I want to update it in some situations. I want to have a thread that every one or two seconds checks the circumstances and updates TextView's text if necessary. Any Idea?

Upvotes: 0

Views: 4658

Answers (3)

marcinj
marcinj

Reputation: 49976

You can use Handler, in your GUI:

Handler hnd = new Handler() {
    public void handleMessage(Message msg) {
        if ( msg.what == 101 ) {
           //update textview
        }
    }
}

pass hnd to your thread, and in your thread do:

Message m = new Message();
m.what = 101;
hnd.sendMessage(m);

this assumes that in your separate thread you are doing some work that needs reporting to GUI thread, you can also send text messages

Upvotes: 3

Adam Pierce
Adam Pierce

Reputation: 34345

I do something like this:

public class MyClass {
  private Handler  hUpdate;
  private Runnable rUpdate;

  public MyClass() { // Constructor
    hUpdate = new Handler();
    rUpdate = new Runnable() {
      // Do your GUI updates here
    };

    Thread tUpdate = new Thread() {
      public void run() {
        while(true) {
          hUpdate.post(rUpdate);
          sleep(500);
        }
      }
    }
    tUpdate.start();
  }
}

Upvotes: 4

Blackbelt
Blackbelt

Reputation: 157447

you have to use an handler to update view from another thread. With postDelayed you can set a delay. see the doc:

handler.postDelayed

Upvotes: 1

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