Never start playing voicemails in the NUI VM tab from the speaker

All voicemails played from the VM tab should always be played from the non-speaker mode.

Bug: 71500892
Test: N/A
PiperOrigin-RevId: 187388964
Change-Id: I3f6a5887784b0192074157cfd8a91727d124ed06
diff --git a/java/com/android/dialer/voicemail/listui/NewVoicemailMediaPlayer.java b/java/com/android/dialer/voicemail/listui/NewVoicemailMediaPlayer.java
index 519a0df..efa1060 100644
--- a/java/com/android/dialer/voicemail/listui/NewVoicemailMediaPlayer.java
+++ b/java/com/android/dialer/voicemail/listui/NewVoicemailMediaPlayer.java
@@ -17,6 +17,7 @@
 package com.android.dialer.voicemail.listui;
 
 import android.content.Context;
+import android.media.AudioManager;
 import android.media.MediaPlayer;
 import android.media.MediaPlayer.OnCompletionListener;
 import android.media.MediaPlayer.OnErrorListener;
@@ -63,6 +64,7 @@
           () -> {
             try {
               mediaPlayer.setDataSource(context, uri);
+              setAudioManagerToNonSpeakerMode(context);
             } catch (IOException e) {
               LogUtil.i(
                   "NewVoicemailMediaPlayer",
@@ -86,6 +88,13 @@
     }
   }
 
+  /** We should never start playing voicemails from the speaker mode */
+  private void setAudioManagerToNonSpeakerMode(Context context) {
+    AudioManager audioManager = context.getSystemService(AudioManager.class);
+    audioManager.setMode(AudioManager.STREAM_MUSIC);
+    audioManager.setSpeakerphoneOn(false);
+  }
+
   private void verifyListenersNotNull() {
     Assert.isNotNull(
         newVoicemailMediaPlayerOnErrorListener,