在听筒模式下am.setSpeakerphoneOn(false);setV olumeControlStream(AudioManager.STREAM_VOICE_CALL);am.setMode(AudioManager.MODE_IN_CALL);我用Mediaplayer AudioTrack调节音量总是失败at.setStereoV olume(vol, vol);player.setV olume(vol，vol);后来决定用AudioManager来调节音量AudioManager可以修改系统Android系统的音量下面介绍几个AudioManager的几个音量调整方面的方法.首先是得到AudioManager实例:AudioManager am=(AudioManager)getSystemService(Context.AUDIO_SERVICE);调整音量方法有两种,一种是渐进式,即像手动按音量键一样,一步一步增加或减少,另一种是直接设置音量值.1、渐进式public void adjustStreamV olume (int streamType, int direction, int flags)am.adjustStreamV olume (AudioManager.STREAM_MUSIC, AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);解释一下三个参数第一个streamType是需要调整音量的类型,这里设的是媒体音量,可以是:STREAM_ALARM 警报STREAM_MUSIC 音乐回放即媒体音量STREAM_NOTIFICA TION 窗口顶部状态栏Notification,STREAM_RING 铃声STREAM_SYSTEM 系统STREAM_VOICE_CALL 通话STREAM_DTMF 双音多频,不是很明白什么东西第二个direction,是调整的方向,增加或减少,可以是:ADJUST_LOWER 降低音量ADJUST_RAISE 升高音量ADJUST_SAME 保持不变,这个主要用于向用户展示当前的音量第三个flags是一些附加参数,只介绍两个常用的FLAG_PLAY_SOUND 调整音量时播放声音FLAG_SHOW_UI 调整时显示音量条,就是按音量键出现的那个2、直接设置音量值的方法:public void setStreamV olume (int streamType, int index, int flags)am.setStreamV olume(AudioManager.STREAM_MUSIC,am.getStreamMaxV olume(AudioManager.STREAM_MUSIC),AudioManager.FLAG_PLAY_SOUND);am.getStreamMaxV olume(AudioManager.STREAM_VOICE_CALL);//得到听筒模式的最大值am.getStreamV olume(AudioManager.STREAM_VOICE_CALL);//得到听筒模式的当前值第一个和第三个参数与上面的相同第二个参数是一个音量的int值,getStreamMaxV olume(int streamType)得到的是该类型音量的最大值,可以根据这个值计算你需要的音量,我这里直接调到最大.最后我的代码：package com.lp;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.InputStream;import Android.app.Activity;import Android.content.Context;import Android.media.AudioFormat;import Android.media.AudioManager;import Android.media.AudioTrack;import Android.os.Bundle;import Android.view.View;import Android.view.View.OnClickListener;import Android.widget.Button;import Android.widget.SeekBar;public class MainActivity5 extends Activity {private Button play;private Button stop;private SeekBar soundV alue;private AudioTrack at;private AudioManager am;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(yout.main_sk);am = (AudioManager)getSystemService(Context.AUDIO_SERVICE);play = (Button)findView ById(R.id.main_sk_play);stop = (Button)findV iewById(R.id.main_sk_stop);soundV alue = (SeekBar)findViewById(R.id.skbV olume);setV olumeControlStream(AudioManager.STREAM_VOICE_CALL);play.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {if(am.isSpeakerphoneOn()){am.setSpeakerphoneOn(false);}//setV olumeControlStream(AudioManager.STREAM_VOICE_CALL);am.setMode(AudioManager.MODE_IN_CALL);System.out.println(am.getStreamMaxV olume(AudioManager.STREAM_VOICE_CALL));System.out.println("&&&&&&&&&&&&&");System.out.println(am.getStreamV olume(AudioManager.STREAM_VOICE_CALL));//am.setStreamV olume(streamType, index, flags)int bufferSizeInBytes = AudioTrack.getMinBufferSize(44100, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT);if(at==null){at = new AudioTrack(AudioManager.STREAM_VOICE_CALL, 44100, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSizeInBytes, AudioTrack.MODE_STREAM);System.out.println("22222");//at.setStereoV olume(100f, 100f);at.setStereoV olume(0.7f, 0.7f);//设置当前音量大小new AudioTrackThread().start();}else{if(at.getPlayState()==AudioTrack.PLAYSTA TE_PLAYING){System.out.println("111111111");}else{System.out.println("33333");at = new AudioTrack(AudioManager.STREAM_VOICE_CALL, 44100, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSizeInBytes, AudioTrack.MODE_STREAM);new AudioTrackThread().start();}}}});stop.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {if(at.getPlayState()==AudioTrack.PLAYSTA TE_PLAYING){try{at.stop();}catch (IllegalStateException e){e.printStackTrace();}at.release();am.setMode(AudioManager.MODE_NORMAL);}}});// soundV alue.setMax(100);//音量调节的极限// soundV alue.setProgress(70);//设置seekbar的位置值soundV alue.setMax(am.getStreamMaxV olume(AudioManager.STREAM_VOICE_CALL)); soundV alue.setProgress(am.getStreamV olume(AudioManager.STREAM_VOICE_CALL));soundV alue.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {// float vol=(float)(seekBar.getProgress())/(float)(seekBar.getMax());// System.out.println(vol);// at.setStereoV olume(vol, vol);//设置音量am.setStreamV olume(AudioManager.STREAM_VOICE_CALL, seekBar.getProgress(), AudioManager.FLAG_PLAY_SOUND);}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stub}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {// TODO Auto-generated method stub}});}class AudioTrackThread extends Thread{@Overridepublic void run() {byte[] out_bytes = new byte[44100];InputStream is = getResources().openRawResource(R.raw.start);int length ;try{at.play();}catch (IllegalStateException e){e.printStackTrace();}try {while((length = is.read(out_bytes))!=-1){//System.out.println(length);at.write(out_bytes, 0, length);}} catch (IOException e) {e.printStackTrace();}if(at.getPlayState()==AudioTrack.PLAYSTA TE_PLAYING){try{at.stop();}catch (IllegalStateException e){e.printStackTrace();}at.release();am.setMode(AudioManager.MODE_NORMAL);}}}}当然权限<uses-permission Android:name="android.permission.MODIFY_AUDIO_SETTINGS" /> <uses-permission Android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission Android:name="android.permission.RECORD_AUDIO" />。