Android给app设置自定义铃声功能

//选择铃声 
 public void toChoose(View view) { 
  Intent intent = new Intent(RingtoneManager.ACTION_RINGTONE_PICKER); 
  intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TYPE, RingtoneManager.TYPE_NOTIFICATION); 
  intent.putExtra(RingtoneManager.EXTRA_RINGTONE_TITLE, "设置通知铃声"); 
  if (myUriStr != null) { 
   intent.putExtra(RingtoneManager.EXTRA_RINGTONE_EXISTING_URI, Uri.parse(myUriStr));//将已经勾选过的铃声传递给系统铃声界面进行显示 
  } 
  startActivityForResult(intent, 0); 
 } 
 
 
 @Override 
 protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
  try { 
   Uri pickedUri = data.getParcelableExtra(RingtoneManager.EXTRA_RINGTONE_PICKED_URI);//获取用户选择的铃声数据 
   myUriStr = pickedUri.toString(); 
 
  } catch (Exception e) { 
   e.printStackTrace(); 
  } 
 } 

//播放铃声 
 public void toPlay(View view) { 
  if (myUriStr == null) {//如果未自定义铃声，则调用系统默认的铃声 
   mMediaPlayer = MediaPlayer.create(this, getSystemDefaultRingtoneUri()); 
  } else { 
   mMediaPlayer = MediaPlayer.create(this, Uri.parse(myUriStr)); 
 
   if(mMediaPlayer == null){ 
    Toast.makeText(this,"该铃声不存在，请重新选择",Toast.LENGTH_LONG).show(); 
    return; 
   } 
  } 
  mMediaPlayer.setLooping(false); 
  try { 
   mMediaPlayer.prepare(); 
  } catch (IllegalStateException e) { 
   e.printStackTrace(); 
  } catch (IOException e) { 
   e.printStackTrace(); 
  } 
 
  mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() { 
   @Override 
   public void onPrepared(MediaPlayer mediaPlayer) { 
    mMediaPlayer.start(); 
   } 
  }); 
 }