AudioManager 修改系统Android系统的音量

package ;

import ;

import ;

import ;

import ;

import ;

import Android.;

import Android.;

import Android.;

import Android.;

import Android.;

import Android.;

import Android.;

import Android.;

import Android.;

import Android.;

/**

* AudioTrack 播放音频 如wav格式

* 并允许调节音量

* @author Administrator

*

*/

public class MainActivity5 extends Activity {

private Button play;

private Button stop;

private SeekBar soundValue;

private AudioTrack at;

private AudioManager am;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(.main_sk);

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

play = (Button)findViewById(.main_sk_play);

stop = (Button)findViewById(.main_sk_stop);

soundValue = (SeekBar)findViewById();

setVolumeControlStream(AudioManager.STREAM_VOICE_CALL);

(new OnClickListener() {

@Override

public void onClick(View v) {

if(()){

(false);

}

//setVolumeControlStream(AudioManager.STREAM_VOICE_CALL);

(AudioManager.MODE_IN_CALL);

((AudioManager.STREAM_VOICE_CALL));

("&&&&&&&&&&&&&");

((AudioManager.STREAM_VOICE_CALL));

//(streamType, index, flags)

int bufferSizeInBytes = (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);

("22222");

//(100f, 100f);

(0.7f, 0.7f);//设置当前音量大小

new AudioTrackThread().start();

}else{

if(()==AudioTrack.PLAYSTATE_PLAYING){

("111111111");

}else{

("33333");

at = new AudioTrack(AudioManager.STREAM_VOICE_CALL, 44100, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSizeInBytes, AudioTrack.MODE_STREAM);

new AudioTrackThread().start();

}

}

}

});

(new OnClickListener() {

@Override

public void onClick(View v) {

if(()==AudioTrack.PLAYSTATE_PLAYING){

try{

();

}catch (IllegalStateException e)

{

();

}

();

(AudioManager.MODE_NORMAL);

}

}

});

// (100);//音量调节的极限

// (70);//设置seekbar的位置值

((AudioManager.STREAM_VOICE_CALL));

((AudioManager.STREAM_VOICE_CALL));

(new () {

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

// float vol=(float)(())/(float)(());

// (vol);

// (vol, vol);//设置音量

(AudioManager.STREAM_VOICE_CALL, (), AudioManager.FLAG_PLAY_SOUND);

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

}

@Override

public void onProgressChanged(SeekBar seekBar, int progress,

boolean fromUser) {

// TODO Auto-generated method stub

}

});

}

class AudioTrackThread extends Thread{

@Override

public void run() {

byte[] out_bytes = new byte[44100];

InputStream is = getResources().openRawResource();

int length ;

try{

();

}catch (IllegalStateException e)

{

();

}

try {

while((length = (out_bytes))!=-1){

//(length);

(out_bytes, 0, length);

}

} catch (IOException e) {

();

}

if(()==AudioTrack.PLAYSTATE_PLAYING){

try{

();

}catch (IllegalStateException e)

{

();

}

();

(AudioManager.MODE_NORMAL);

}

}

}

}