cocos2dx游戏中设置默认调节音量键时显示媒体音量
废话不都说,实现功能主要如标题所说,不走非为两步, @Override
public boolean dispatchKeyEvent(KeyEvent event) {
int event_key = event.getKeyCode();
if(event_key == KeyEvent.KEYCODE_VOLUME_UP){
//音量上键
}
else if(event_key == KeyEvent.KEYCODE_VOLUME_UP){
//音量下键
}
return super.dispatchKeyEvent(event);
}
2、设置音量 am.setSpeakerphoneOn(false); at.setStereoVolume(vol,vol); 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 adjustStreamVolume (int streamType,int direction,int flags) am.adjustStreamVolume (AudioManager.STREAM_MUSIC,AudioManager.ADJUST_RAISE,AudioManager.FLAG_SHOW_UI); 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: 第二个direction,是调整的方向,增加或减少,可以是: 第三个flags是一些附加参数,只介绍两个常用的 public void setStreamVolume (int streamType,int index,int flags) am.setStreamVolume(AudioManager.STREAM_MUSIC,am.getStreamMaxVolume(AudioManager.STREAM_MUSIC),AudioManager.FLAG_PLAY_SOUND); 第二个参数是一个音量的int值,getStreamMaxVolume(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;
/** * 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(R.layout.main_sk);
am = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
play = (Button)findViewById(R.id.main_sk_play);
stop = (Button)findViewById(R.id.main_sk_stop);
soundValue = (SeekBar)findViewById(R.id.skbVolume);
setVolumeControlStream(AudioManager.STREAM_VOICE_CALL);
play.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(am.isSpeakerphoneOn()){
am.setSpeakerphoneOn(false);
}
//setVolumeControlStream(AudioManager.STREAM_VOICE_CALL);
am.setMode(AudioManager.MODE_IN_CALL);
System.out.println(am.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL));
System.out.println("&&&&&&&&&&&&&");
System.out.println(am.getStreamVolume(AudioManager.STREAM_VOICE_CALL));
//am.setStreamVolume(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.ENCODING_PCM_16BIT,bufferSizeInBytes,AudioTrack.MODE_STREAM);
System.out.println("22222");
//at.setStereoVolume(100f,100f);
at.setStereoVolume(0.7f,0.7f);//设置当前音量大小
new AudioTrackThread().start();
}else{
if(at.getPlayState()==AudioTrack.PLAYSTATE_PLAYING){
System.out.println("222221111");
}else{
System.out.println("33333");
at = new AudioTrack(AudioManager.STREAM_VOICE_CALL,AudioTrack.MODE_STREAM);
new AudioTrackThread().start();
}
}
}
});
stop.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(at.getPlayState()==AudioTrack.PLAYSTATE_PLAYING){
try{
at.stop();
}catch (IllegalStateException e)
{
e.printStackTrace();
}
at.release();
am.setMode(AudioManager.MODE_NORMAL);
}
}
});
// soundValue.setMax(100);//音量调节的极限
// soundValue.setProgress(70);//设置seekbar的位置值
soundValue.setMax(am.getStreamMaxVolume(AudioManager.STREAM_VOICE_CALL));
soundValue.setProgress(am.getStreamVolume(AudioManager.STREAM_VOICE_CALL));
soundValue.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// float vol=(float)(seekBar.getProgress())/(float)(seekBar.getMax());
// System.out.println(vol);
// at.setStereoVolume(vol,vol);//设置音量
am.setStreamVolume(AudioManager.STREAM_VOICE_CALL,seekBar.getProgress(),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(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.PLAYSTATE_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" />
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