From http://developer.android.com/training/multiple-threads/define-runnable.html

Thread.java

class PhotoDecodeRunnable implements Runnable {...    /*     * Defines the code to run for this task.     */    @Override    public void run() {        // Moves the current Thread into the background        android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_BACKGROUND);        ...        /*         * Stores the current Thread in the PhotoTask instance,         * so that the instance         * can interrupt the Thread.         */        mPhotoTask.setImageDecodeThread(Thread.currentThread());        ...    }...}