title: Android how can I mute stream voice call compeletely?
body: <p>As the title suggests, I want to mute the sound before the call was connected. I set stream by below code: </p>
  
  <pre><code>mAudioManager.setStreamMute(AudioManager.STREAM_VOICE_CALL, true);
  </code></pre>
  
  <p>and also try code:</p>
  
  <pre><code>mAudioManager.setStreamVolume(AudioManager.STREAM_VOICE_CALL, 0, 0);
  </code></pre>
  
  <p>It can make the sound at the lowest, but it is not silent. There is still a small sound. If I play another music this time, they will mix together. I don't want this suitation.</p>
  
  <p>Do any one have any ideas to avoid this issue? Many thanks.</p>