title: Android fixed delta time still choppy?
body: <p>Below is my game loop and logCat output. The game runs a bit choppy and I noticed in LogCat that GC is running every so often. I'm not quite sure if the GC or delta time is causing this? can someone try to point me in the right direction based on the info provided?</p>
  
  <pre><code>@Override
  public void run() {
  
      Canvas canvas;
      while (isRunning) {
          if (!gamePanel.paused) {
              canvas = null;
              try {
                  startDraw = System.currentTimeMillis();
                  canvas = surfaceHolder.lockCanvas();
                  synchronized (surfaceHolder) {
                      gamePanel.update(deltaTime);
                      gamePanel.draw(canvas);
                  }
              } finally {
                  if (canvas != null) {
                      surfaceHolder.unlockCanvasAndPost(canvas);
                      endDraw = System.currentTimeMillis();
                      MyLogger.getInstance().log(
                              "delta time = " + (endDraw - startDraw)
                                      / 1000.f);
                  }
              }
  
              deltaTime = (endDraw - startDraw)
                      / 1000.f;
  
          }
      }
  }
  
  -09-04 15:59:29.855: D/dalvikvm(3273): GC_FOR_ALLOC freed 4427K, 35% free 18542K/28387K, paused 25ms, total 27ms
  09-04 15:59:29.855: I/dalvikvm-heap(3273): Grow heap (frag case) to 22.083MB for 4096016-byte allocation
  09-04 15:59:29.886: D/dalvikvm(3273): GC_CONCURRENT freed 2278K, 29% free 20263K/28387K, paused 3ms+3ms, total 27ms
  09-04 15:59:30.144: D/MediaPlayer(3273): start() mUri is null
  09-04 15:59:30.160: D/MyLogger(3273): delta time = 0.026
  09-04 15:59:30.214: D/MyLogger(3273): delta time = 0.052
  09-04 15:59:30.253: D/MyLogger(3273): delta time = 0.042
  09-04 15:59:30.277: D/MyLogger(3273): delta time = 0.019
  09-04 15:59:30.293: D/MyLogger(3273): delta time = 0.015
  09-04 15:59:30.308: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:30.324: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:30.339: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:30.355: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:30.386: D/MyLogger(3273): delta time = 0.026
  09-04 15:59:30.402: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:30.418: D/MyLogger(3273): delta time = 0.019
  09-04 15:59:30.441: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:30.457: D/MyLogger(3273): delta time = 0.015
  09-04 15:59:30.464: D/MyLogger(3273): delta time = 0.012
  09-04 15:59:30.480: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:30.496: D/MyLogger(3273): delta time = 0.014
  09-04 15:59:30.519: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:30.535: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:30.550: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:30.574: D/MyLogger(3273): delta time = 0.02
  09-04 15:59:30.589: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:30.605: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:30.621: D/MyLogger(3273): delta time = 0.02
  09-04 15:59:30.644: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:32.550: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:32.566: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:32.582: D/MyLogger(3273): delta time = 0.015
  09-04 15:59:32.597: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:32.621: D/MyLogger(3273): delta time = 0.019
  09-04 15:59:32.636: D/MyLogger(3273): delta time = 0.014
  09-04 15:59:32.652: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:32.668: D/MyLogger(3273): delta time = 0.015
  09-04 15:59:32.683: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:32.699: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:32.714: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:32.730: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:32.753: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:32.769: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:32.785: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:32.808: D/MyLogger(3273): delta time = 0.021
  09-04 15:59:36.535: D/MyLogger(3273): delta time = 0.012
  09-04 15:59:36.558: D/MyLogger(3273): delta time = 0.019
  09-04 15:59:36.574: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:36.589: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:36.605: D/MyLogger(3273): delta time = 0.015
  09-04 15:59:36.621: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:36.644: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:36.652: D/MyLogger(3273): delta time = 0.014
  09-04 15:59:36.675: D/MyLogger(3273): delta time = 0.02
  09-04 15:59:36.691: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:36.707: D/MyLogger(3273): delta time = 0.015
  09-04 15:59:36.722: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:38.214: D/MyLogger(3273): delta time = 0.015
  09-04 15:59:38.230: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:38.246: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:38.269: D/MyLogger(3273): delta time = 0.019
  09-04 15:59:38.285: D/MyLogger(3273): delta time = 0.019
  09-04 15:59:38.308: D/MyLogger(3273): delta time = 0.022
  09-04 15:59:38.332: D/MyLogger(3273): delta time = 0.021
  09-04 15:59:38.347: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:38.363: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:38.378: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:38.402: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:38.418: D/MyLogger(3273): delta time = 0.02
  09-04 15:59:38.433: D/MyLogger(3273): delta time = 0.014
  09-04 15:59:38.457: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:38.472: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:38.488: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:38.503: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:38.519: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:38.535: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:38.550: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:38.574: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:38.589: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:38.636: D/dalvikvm(3273): GC_CONCURRENT freed 5659K, 35% free 18532K/28387K, paused 13ms+2ms, total 42ms
  09-04 15:59:38.636: D/MyLogger(3273): delta time = 0.043
  09-04 15:59:38.652: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:38.668: D/MyLogger(3273): delta time = 0.019
  09-04 15:59:38.683: D/MyLogger(3273): delta time = 0.013
  09-04 15:59:38.699: D/MyLogger(3273): delta time = 0.019
  09-04 15:59:38.730: D/MyLogger(3273): delta time = 0.025
  09-04 15:59:38.746: D/MyLogger(3273): delta time = 0.02
  09-04 15:59:38.769: D/MyLogger(3273): delta time = 0.02
  09-04 15:59:38.785: D/MyLogger(3273): delta time = 0.014
  09-04 15:59:38.808: D/MyLogger(3273): delta time = 0.022
  09-04 15:59:38.824: D/MyLogger(3273): delta time = 0.022
  09-04 15:59:38.839: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:38.863: D/MyLogger(3273): delta time = 0.02
  09-04 15:59:38.878: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:38.894: D/MyLogger(3273): delta time = 0.019
  09-04 15:59:38.918: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:38.933: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:38.957: D/MyLogger(3273): delta time = 0.019
  09-04 15:59:38.972: D/MyLogger(3273): delta time = 0.019
  09-04 15:59:38.996: D/MyLogger(3273): delta time = 0.023
  09-04 15:59:39.011: D/MyLogger(3273): delta time = 0.02
  09-04 15:59:39.035: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:39.050: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:39.074: D/MyLogger(3273): delta time = 0.019
  09-04 15:59:39.089: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:39.113: D/MyLogger(3273): delta time = 0.022
  09-04 15:59:39.128: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:39.144: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:39.160: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:39.191: D/MyLogger(3273): delta time = 0.029
  09-04 15:59:39.222: D/MyLogger(3273): delta time = 0.028
  09-04 15:59:39.238: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:39.261: D/MyLogger(3273): delta time = 0.02
  09-04 15:59:39.277: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:39.293: D/MyLogger(3273): delta time = 0.017
  09-04 15:59:39.308: D/MyLogger(3273): delta time = 0.019
  09-04 15:59:39.324: D/MyLogger(3273): delta time = 0.014
  09-04 15:59:39.339: D/MyLogger(3273): delta time = 0.015
  09-04 15:59:39.355: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:39.371: D/MyLogger(3273): delta time = 0.016
  09-04 15:59:39.394: D/MyLogger(3273): delta time = 0.019
  09-04 15:59:39.410: D/MyLogger(3273): delta time = 0.018
  09-04 15:59:39.433: D/MyLogger(3273): delta time = 0.02
  09-04 15:59:39.449: D/MyLogger(3273): delta time = 0.02
  </code></pre>