title: Android Remove Handler postDelayed Dynamically
body: <p>I want to set dynamically auto scroll speed to WebView. In onCreate calling autoScroll(25) and remove it, nextly calling autoScroll(300) but when the apk is running the auto scroll speed is 25 so earlier called 'mHandler.postDelayed' do not removing. How to fix the problem?</p>
  
  <pre><code>Handler mHandler;
  Runnable runnable;
  WebView wv;
  
  protected void onCreate(Bundle savedInstanceState) {
      ...
      autoScroll(25);
      mHandler.removeCallbacks(runnable);
      autoScroll(300);
  }
  
  public void autoScroll(final int speed){
      if(mHandler == null) {
          mHandler = new Handler();
      }
      wv.post(runnable = new Runnable() {
          @Override
          public void run() {
              wv.scrollBy(0, 1);
              mHandler.postDelayed(this, speed);
          }
      });
  }
  </code></pre>