ensure that player do not release at ui thread to avoid ANR in some rom

```
public synchronized void release() {
    if (!released) {
      handler.sendEmptyMessage(MSG_RELEASE);
      while (!released) {
        try {
          wait();
        } catch (InterruptedException e) {
          Thread.currentThread().interrupt();
        }
      }
      internalPlaybackThread.quit();
    }
  }
```
when execute at main thread,'wait();' may cause ANR in some rom.