Treads Android

!!readme.md

Threads - in Android

UI and Worker thread access

Android does not allow to access the UI from a worker tread.

This shows how to access the UI thread from a Worker thread. The following are some methods to access the UI.thread:

• Activity.runOnUiThread(Runnable)
• View.post(Runnable)
• View.postDelayed(Runnable, long)

Cancelation

• implement a canclation flag
• exit run

01_thread.java

public void onClick(View v) {

  new Thread(new Runnable() {
        public void run() {
            // a potentially  time consuming task
            final Bitmap bitmap =  processBitMap("image.png");
            mImageView.post(new Runnable() {
                public void run() {
                    mImageView.setImageBitmap(bitmap);
                }
            });
        }
    }).start();
}

02_cancelation.java

public class MyThread extends Thread {
  private boolean mRunning;
  @Override   public void run() {
    mRunning = true;
    while (mRunning) {
      // Do hard work...
    }
  }
  public void cancel() {
    mRunning = false; 
  }
}