private class MyThread extends Thread{
                @Override
                public void run() {
                    //TODO
                }
         }
        ...
        new MyThread().start();

private class MyRunnable implements Runnable{
                @Override
                public void run() {
                    //TODO
                }
        }
        ...
        new Thread(new MyRunnable()).start();

public void onClick(View view) {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        Bitmap b = loadImageFromNetwork("http://example.com/img.png");
                        mImageView.setImageBitmap(b);
                    }
                }).start();
            }

1. *Activity.runOnUiThread(Runnable)*
2. *View.post(Runnable)*
3. *View.postDelayed(Runnable, long)*

public void onClick(View view) {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        final Bitmap b = loadImageFromNetwork("http://example.com/img.png");
                        mImageView.post(new Runnable() {
                            @Override
                            public void run() {
                                mImageView.setImageBitmap(b);
                            }
                        });
                    }
                }).start();
            }

private void postTaskInsideBackgroundTask() {
        Thread backgroundThread = new Thread(new Runnable() {
            @Override
            public void run() {
                // pretend to do something "background-y"
                try {
                    TimeUnit.SECONDS.sleep(1);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                mainThreadHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        tv04.setText("Hi from a Handler inside of a background Thread!");
                    }
                });
            }
        });
        backgroundThread.start();
    }

private class DownloadMp3Task extends AsyncTask<URL, Integer, Long> {
 protected Long doInBackground(URL... urls) {
      //Yet to code
     }
 protected void onProgressUpdate(Integer... progress) {
     //Yet to code
     }
 protected void onPostExecute(Long result) {
     //Yet to code
     }
}

new DownloadMp3Task().execute(mp3URL);