Android:如何以编程方式设置 MediaPlayer 音量？

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Android : How to set MediaPlayer volume programmatically?

如何以编程方式设置媒体播放器音量。我将它用于警报通知。任何帮助都非常感谢，并提前感谢。

使用 AudioManager，您可以简单地控制媒体播放器的音量。

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
setVolume(float leftVolume, float rightVolume)
  audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_RAISE, 0);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_LOWER, 0);
  val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager

  val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)



  val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)

  val percent = 0.2f

  val twintyVolume = (maxVolume * percent).toInt()



  if ( level > twintyVolume) {

    Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()

    audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)

  }
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

try 

{    

 float count = 100 * 0.2f;

 Log.d("--count_float", count +"");

 Log.d("--count_final", Math.round(count) +"");

 Log.d("--count_volume", new 

 PreferenceMotionSensor(mContext).getStreamVolume());

 mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);

} 

catch (Exception e) 

{

 Log.d("--Error", e.getMessage());

}
D/--count_float: 20.0

D/--count_final: 20

D/--count_volume: 100
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

protected static void setVolume(int volume) {

    currentVolume = volume;

    {

      if (volume == 1) {

        volume = 2;

      }

      try {

        float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);

        mediaPlayer.setVolume(vol, vol);

      } catch (Exception e) {

        e.printStackTrace();

      }

    }



  }

if (System.nanoTime() == alarm){

  yourMediaPlayer.setVolume(volume, volume)}

}

也来自 MediaPlayer(但我没有尝试过)

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
setVolume(float leftVolume, float rightVolume)
  audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_RAISE, 0);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_LOWER, 0);
  val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager

  val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)



  val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)

  val percent = 0.2f

  val twintyVolume = (maxVolume * percent).toInt()



  if ( level > twintyVolume) {

    Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()

    audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)

  }
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

try 

{    

 float count = 100 * 0.2f;

 Log.d("--count_float", count +"");

 Log.d("--count_final", Math.round(count) +"");

 Log.d("--count_volume", new 

 PreferenceMotionSensor(mContext).getStreamVolume());

 mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);

} 

catch (Exception e) 

{

 Log.d("--Error", e.getMessage());

}
D/--count_float: 20.0

D/--count_final: 20

D/--count_volume: 100
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

protected static void setVolume(int volume) {

    currentVolume = volume;

    {

      if (volume == 1) {

        volume = 2;

      }

      try {

        float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);

        mediaPlayer.setVolume(vol, vol);

      } catch (Exception e) {

        e.printStackTrace();

      }

    }



  }

if (System.nanoTime() == alarm){

  yourMediaPlayer.setVolume(volume, volume)}

}

Since: API Level 1

Sets the volume on this player. This API is recommended for balancing

the output of audio streams within an application. Unless you are

writing an application to control user settings, this API should be

used in preference to setStreamVolume(int, int, int) which sets the

volume of ALL streams of a particular type. Note that the passed

volume values are raw scalars. UI controls should be scaled

logarithmically.

Parameters

leftVolume left volume scalar

rightVolume right volume scalar

希望有帮助

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
setVolume(float leftVolume, float rightVolume)
  audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_RAISE, 0);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_LOWER, 0);
  val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager

  val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)



  val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)

  val percent = 0.2f

  val twintyVolume = (maxVolume * percent).toInt()



  if ( level > twintyVolume) {

    Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()

    audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)

  }
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

try 

{    

 float count = 100 * 0.2f;

 Log.d("--count_float", count +"");

 Log.d("--count_final", Math.round(count) +"");

 Log.d("--count_volume", new 

 PreferenceMotionSensor(mContext).getStreamVolume());

 mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);

} 

catch (Exception e) 

{

 Log.d("--Error", e.getMessage());

}
D/--count_float: 20.0

D/--count_final: 20

D/--count_volume: 100
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

protected static void setVolume(int volume) {

    currentVolume = volume;

    {

      if (volume == 1) {

        volume = 2;

      }

      try {

        float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);

        mediaPlayer.setVolume(vol, vol);

      } catch (Exception e) {

        e.printStackTrace();

      }

    }



  }

if (System.nanoTime() == alarm){

  yourMediaPlayer.setVolume(volume, volume)}

}

用于提高音量

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
setVolume(float leftVolume, float rightVolume)
  audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_RAISE, 0);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_LOWER, 0);
  val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager

  val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)



  val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)

  val percent = 0.2f

  val twintyVolume = (maxVolume * percent).toInt()



  if ( level > twintyVolume) {

    Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()

    audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)

  }
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

try 

{    

 float count = 100 * 0.2f;

 Log.d("--count_float", count +"");

 Log.d("--count_final", Math.round(count) +"");

 Log.d("--count_volume", new 

 PreferenceMotionSensor(mContext).getStreamVolume());

 mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);

} 

catch (Exception e) 

{

 Log.d("--Error", e.getMessage());

}
D/--count_float: 20.0

D/--count_final: 20

D/--count_volume: 100
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

protected static void setVolume(int volume) {

    currentVolume = volume;

    {

      if (volume == 1) {

        volume = 2;

      }

      try {

        float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);

        mediaPlayer.setVolume(vol, vol);

      } catch (Exception e) {

        e.printStackTrace();

      }

    }



  }

if (System.nanoTime() == alarm){

  yourMediaPlayer.setVolume(volume, volume)}

}

用于降低音量

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
setVolume(float leftVolume, float rightVolume)
  audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_RAISE, 0);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_LOWER, 0);
  val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager

  val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)



  val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)

  val percent = 0.2f

  val twintyVolume = (maxVolume * percent).toInt()



  if ( level > twintyVolume) {

    Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()

    audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)

  }
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

try 

{    

 float count = 100 * 0.2f;

 Log.d("--count_float", count +"");

 Log.d("--count_final", Math.round(count) +"");

 Log.d("--count_volume", new 

 PreferenceMotionSensor(mContext).getStreamVolume());

 mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);

} 

catch (Exception e) 

{

 Log.d("--Error", e.getMessage());

}
D/--count_float: 20.0

D/--count_final: 20

D/--count_volume: 100
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

protected static void setVolume(int volume) {

    currentVolume = volume;

    {

      if (volume == 1) {

        volume = 2;

      }

      try {

        float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);

        mediaPlayer.setVolume(vol, vol);

      } catch (Exception e) {

        e.printStackTrace();

      }

    }



  }

if (System.nanoTime() == alarm){

  yourMediaPlayer.setVolume(volume, volume)}

}

MediaPlayer 类中确实有 setVolume 方法。看这里

隐藏音量控制 UI：

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
setVolume(float leftVolume, float rightVolume)
  audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_RAISE, 0);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_LOWER, 0);
  val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager

  val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)



  val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)

  val percent = 0.2f

  val twintyVolume = (maxVolume * percent).toInt()



  if ( level > twintyVolume) {

    Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()

    audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)

  }
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

try 

{    

 float count = 100 * 0.2f;

 Log.d("--count_float", count +"");

 Log.d("--count_final", Math.round(count) +"");

 Log.d("--count_volume", new 

 PreferenceMotionSensor(mContext).getStreamVolume());

 mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);

} 

catch (Exception e) 

{

 Log.d("--Error", e.getMessage());

}
D/--count_float: 20.0

D/--count_final: 20

D/--count_volume: 100
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

protected static void setVolume(int volume) {

    currentVolume = volume;

    {

      if (volume == 1) {

        volume = 2;

      }

      try {

        float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);

        mediaPlayer.setVolume(vol, vol);

      } catch (Exception e) {

        e.printStackTrace();

      }

    }



  }

if (System.nanoTime() == alarm){

  yourMediaPlayer.setVolume(volume, volume)}

}

提高音量

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
setVolume(float leftVolume, float rightVolume)
  audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_RAISE, 0);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_LOWER, 0);
  val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager

  val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)



  val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)

  val percent = 0.2f

  val twintyVolume = (maxVolume * percent).toInt()



  if ( level > twintyVolume) {

    Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()

    audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)

  }
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

try 

{    

 float count = 100 * 0.2f;

 Log.d("--count_float", count +"");

 Log.d("--count_final", Math.round(count) +"");

 Log.d("--count_volume", new 

 PreferenceMotionSensor(mContext).getStreamVolume());

 mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);

} 

catch (Exception e) 

{

 Log.d("--Error", e.getMessage());

}
D/--count_float: 20.0

D/--count_final: 20

D/--count_volume: 100
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

protected static void setVolume(int volume) {

    currentVolume = volume;

    {

      if (volume == 1) {

        volume = 2;

      }

      try {

        float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);

        mediaPlayer.setVolume(vol, vol);

      } catch (Exception e) {

        e.printStackTrace();

      }

    }



  }

if (System.nanoTime() == alarm){

  yourMediaPlayer.setVolume(volume, volume)}

}

用于降低音量

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
setVolume(float leftVolume, float rightVolume)
  audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_RAISE, 0);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_LOWER, 0);
  val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager

  val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)



  val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)

  val percent = 0.2f

  val twintyVolume = (maxVolume * percent).toInt()



  if ( level > twintyVolume) {

    Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()

    audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)

  }
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

try 

{    

 float count = 100 * 0.2f;

 Log.d("--count_float", count +"");

 Log.d("--count_final", Math.round(count) +"");

 Log.d("--count_volume", new 

 PreferenceMotionSensor(mContext).getStreamVolume());

 mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);

} 

catch (Exception e) 

{

 Log.d("--Error", e.getMessage());

}
D/--count_float: 20.0

D/--count_final: 20

D/--count_volume: 100
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

protected static void setVolume(int volume) {

    currentVolume = volume;

    {

      if (volume == 1) {

        volume = 2;

      }

      try {

        float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);

        mediaPlayer.setVolume(vol, vol);

      } catch (Exception e) {

        e.printStackTrace();

      }

    }



  }

if (System.nanoTime() == alarm){

  yourMediaPlayer.setVolume(volume, volume)}

}

您可以使用 Kotlin 执行以下操作，此代码将检查媒体音量是否超过设备最大音量的 20%，并将其减少到仅 20%。

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
setVolume(float leftVolume, float rightVolume)
  audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_RAISE, 0);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_LOWER, 0);
  val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager

  val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)



  val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)

  val percent = 0.2f

  val twintyVolume = (maxVolume * percent).toInt()



  if ( level > twintyVolume) {

    Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()

    audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)

  }
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

try 

{    

 float count = 100 * 0.2f;

 Log.d("--count_float", count +"");

 Log.d("--count_final", Math.round(count) +"");

 Log.d("--count_volume", new 

 PreferenceMotionSensor(mContext).getStreamVolume());

 mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);

} 

catch (Exception e) 

{

 Log.d("--Error", e.getMessage());

}
D/--count_float: 20.0

D/--count_final: 20

D/--count_volume: 100
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

protected static void setVolume(int volume) {

    currentVolume = volume;

    {

      if (volume == 1) {

        volume = 2;

      }

      try {

        float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);

        mediaPlayer.setVolume(vol, vol);

      } catch (Exception e) {

        e.printStackTrace();

      }

    }



  }

if (System.nanoTime() == alarm){

  yourMediaPlayer.setVolume(volume, volume)}

}

在此处阅读此页面。它解释得很好。

基本上，除非您的应用是替代闹钟，否则您需要在"onCreate()"函数中进行以下调用：

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
setVolume(float leftVolume, float rightVolume)
  audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_RAISE, 0);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_LOWER, 0);
  val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager

  val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)



  val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)

  val percent = 0.2f

  val twintyVolume = (maxVolume * percent).toInt()



  if ( level > twintyVolume) {

    Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()

    audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)

  }
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

try 

{    

 float count = 100 * 0.2f;

 Log.d("--count_float", count +"");

 Log.d("--count_final", Math.round(count) +"");

 Log.d("--count_volume", new 

 PreferenceMotionSensor(mContext).getStreamVolume());

 mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);

} 

catch (Exception e) 

{

 Log.d("--Error", e.getMessage());

}
D/--count_float: 20.0

D/--count_final: 20

D/--count_volume: 100
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

protected static void setVolume(int volume) {

    currentVolume = volume;

    {

      if (volume == 1) {

        volume = 2;

      }

      try {

        float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);

        mediaPlayer.setVolume(vol, vol);

      } catch (Exception e) {

        e.printStackTrace();

      }

    }



  }

if (System.nanoTime() == alarm){

  yourMediaPlayer.setVolume(volume, volume)}

}

通过这种方式，您可以使用硬件按钮创建应用的音量。

代码：

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
setVolume(float leftVolume, float rightVolume)
  audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_RAISE, 0);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_LOWER, 0);
  val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager

  val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)



  val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)

  val percent = 0.2f

  val twintyVolume = (maxVolume * percent).toInt()



  if ( level > twintyVolume) {

    Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()

    audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)

  }
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

try 

{    

 float count = 100 * 0.2f;

 Log.d("--count_float", count +"");

 Log.d("--count_final", Math.round(count) +"");

 Log.d("--count_volume", new 

 PreferenceMotionSensor(mContext).getStreamVolume());

 mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);

} 

catch (Exception e) 

{

 Log.d("--Error", e.getMessage());

}
D/--count_float: 20.0

D/--count_final: 20

D/--count_volume: 100
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

protected static void setVolume(int volume) {

    currentVolume = volume;

    {

      if (volume == 1) {

        volume = 2;

      }

      try {

        float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);

        mediaPlayer.setVolume(vol, vol);

      } catch (Exception e) {

        e.printStackTrace();

      }

    }



  }

if (System.nanoTime() == alarm){

  yourMediaPlayer.setVolume(volume, volume)}

}

输出

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
setVolume(float leftVolume, float rightVolume)
  audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_RAISE, 0);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_LOWER, 0);
  val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager

  val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)



  val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)

  val percent = 0.2f

  val twintyVolume = (maxVolume * percent).toInt()



  if ( level > twintyVolume) {

    Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()

    audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)

  }
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

try 

{    

 float count = 100 * 0.2f;

 Log.d("--count_float", count +"");

 Log.d("--count_final", Math.round(count) +"");

 Log.d("--count_volume", new 

 PreferenceMotionSensor(mContext).getStreamVolume());

 mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);

} 

catch (Exception e) 

{

 Log.d("--Error", e.getMessage());

}
D/--count_float: 20.0

D/--count_final: 20

D/--count_volume: 100
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

protected static void setVolume(int volume) {

    currentVolume = volume;

    {

      if (volume == 1) {

        volume = 2;

      }

      try {

        float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);

        mediaPlayer.setVolume(vol, vol);

      } catch (Exception e) {

        e.printStackTrace();

      }

    }



  }

if (System.nanoTime() == alarm){

  yourMediaPlayer.setVolume(volume, volume)}

}

以下代码将音量设置为最大级别 (getStreamMaxVolume())。

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
setVolume(float leftVolume, float rightVolume)
  audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_RAISE, 0);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_LOWER, 0);
  val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager

  val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)



  val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)

  val percent = 0.2f

  val twintyVolume = (maxVolume * percent).toInt()



  if ( level > twintyVolume) {

    Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()

    audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)

  }
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

try 

{    

 float count = 100 * 0.2f;

 Log.d("--count_float", count +"");

 Log.d("--count_final", Math.round(count) +"");

 Log.d("--count_volume", new 

 PreferenceMotionSensor(mContext).getStreamVolume());

 mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);

} 

catch (Exception e) 

{

 Log.d("--Error", e.getMessage());

}
D/--count_float: 20.0

D/--count_final: 20

D/--count_volume: 100
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

protected static void setVolume(int volume) {

    currentVolume = volume;

    {

      if (volume == 1) {

        volume = 2;

      }

      try {

        float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);

        mediaPlayer.setVolume(vol, vol);

      } catch (Exception e) {

        e.printStackTrace();

      }

    }



  }

if (System.nanoTime() == alarm){

  yourMediaPlayer.setVolume(volume, volume)}

}

试试这个

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
setVolume(float leftVolume, float rightVolume)
  audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_RAISE, 0);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_LOWER, 0);
  val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager

  val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)



  val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)

  val percent = 0.2f

  val twintyVolume = (maxVolume * percent).toInt()



  if ( level > twintyVolume) {

    Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()

    audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)

  }
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

try 

{    

 float count = 100 * 0.2f;

 Log.d("--count_float", count +"");

 Log.d("--count_final", Math.round(count) +"");

 Log.d("--count_volume", new 

 PreferenceMotionSensor(mContext).getStreamVolume());

 mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);

} 

catch (Exception e) 

{

 Log.d("--Error", e.getMessage());

}
D/--count_float: 20.0

D/--count_final: 20

D/--count_volume: 100
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

protected static void setVolume(int volume) {

    currentVolume = volume;

    {

      if (volume == 1) {

        volume = 2;

      }

      try {

        float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);

        mediaPlayer.setVolume(vol, vol);

      } catch (Exception e) {

        e.printStackTrace();

      }

    }



  }

if (System.nanoTime() == alarm){

  yourMediaPlayer.setVolume(volume, volume)}

}

记得设置左右扬声器音量。

AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);

audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 20, 0);
setVolume(float leftVolume, float rightVolume)
  audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

            AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
audio = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_RAISE, 0);
audio.adjustStreamVolume(AudioManager.STREAM_MUSIC,

          AudioManager.ADJUST_LOWER, 0);
  val audio = this.getSystemService(Context.AUDIO_SERVICE) as AudioManager

  val level = audio.getStreamVolume(AudioManager.STREAM_MUSIC)



  val maxVolume = audio.getStreamMaxVolume(AudioManager.STREAM_MUSIC)

  val percent = 0.2f

  val twintyVolume = (maxVolume * percent).toInt()



  if ( level > twintyVolume) {

    Toast.makeText(this,"audio level is $level", Toast.LENGTH_LONG).show()

    audio.setStreamVolume(AudioManager.STREAM_MUSIC,twintyVolume,0)

  }
setVolumeControlStream(AudioManager.STREAM_MUSIC);
AudioManager mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);

try 

{    

 float count = 100 * 0.2f;

 Log.d("--count_float", count +"");

 Log.d("--count_final", Math.round(count) +"");

 Log.d("--count_volume", new 

 PreferenceMotionSensor(mContext).getStreamVolume());

 mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, Math.round(count), 0);

} 

catch (Exception e) 

{

 Log.d("--Error", e.getMessage());

}
D/--count_float: 20.0

D/--count_final: 20

D/--count_volume: 100
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);

am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);

protected static void setVolume(int volume) {

    currentVolume = volume;

    {

      if (volume == 1) {

        volume = 2;

      }

      try {

        float vol = ((float) volume / CONSTANT.SYSTEM_MAX_VOLUME);

        mediaPlayer.setVolume(vol, vol);

      } catch (Exception e) {

        e.printStackTrace();

      }

    }



  }

if (System.nanoTime() == alarm){

  yourMediaPlayer.setVolume(volume, volume)}

}
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