Android模拟音量按键- 控制系统音频 包括外接音响

• 问题简述
• UI
• UI代码
• 代码内容

问题简述

如何通过app内部的button控制手机的系统音频（包括外接音响）
- 这次的问题是如果用户已经用了某个音乐软件 （ spotify 网易音乐之类的）， 我们能不能通过自己app内部的button去控制音频。 像系统自带的widget，可以 控制上一首 /下一首， 播放/暂停 ， 以及音量控制。

UI

UI代码

其实没有什么具体的内容，就是为了省事也一会放上吧

代码内容

//初始 

protected ConstraintLayout audioPage; 
private ImageButton playButton; 
private ImageButton pauseButton; 
private MediaPlayer mediaPlayer01; 
public AudioManager audiomanage; 
private TextView mVolume ; 
public SeekBar soundBar; 
private int maxVolume, currentVolume; 
private int volume=0; 
private boolean isPlayMusic = false; 

 

 

//获得音频权限 

audiomanage = (AudioManager)getSystemService(Context.AUDIO_SERVICE); 
mediaPlayer01 = new MediaPlayer(); 
playButton = findViewById(R.id.audio_play); 
pauseButton = findViewById(R.id.audio_pause); 
 
final SeekBar soundBar=(SeekBar)findViewById(R.id.sound); 
mVolume = (TextView)findViewById(R.id.mVolume); 
audiomanage = (AudioManager)getSystemService(Context.AUDIO_SERVICE); 
maxVolume = audiomanage.getStreamMaxVolume(AudioManager.STREAM_MUSIC); //获取系统最大音量 
soundBar.setMax(maxVolume); //拖动条最高值与系统最大声匹配 
currentVolume = audiomanage.getStreamVolume(AudioManager.STREAM_MUSIC); //获取当前值 
soundBar.setProgress(currentVolume); 
mVolume.setText(currentVolume*100/maxVolume + " %"); 
 
soundBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() //调音监听器 
{ 
public void onProgressChanged(SeekBar arg0,int progress,boolean fromUser) 
{ 
audiomanage.setStreamVolume(AudioManager.STREAM_MUSIC, progress, 0); 
currentVolume = audiomanage.getStreamVolume(AudioManager.STREAM_MUSIC); //获取当前值 
soundBar.setProgress(currentVolume); 
mVolume.setText(currentVolume*100/maxVolume + " %"); 
} 
 
@Override 
public void onStartTrackingTouch(SeekBar seekBar) { 
// TODO Auto-generated method stub 
} 
@Override 
public void onStopTrackingTouch(SeekBar seekBar) { 
// TODO Auto-generated method stub 
} 
}); 

 

 

//确认音频是否在播放 修改中间button 

public void playOrPause() { 
AudioManager mAudioManager = (AudioManager)getSystemService(AUDIO_SERVICE); 
 
if (mAudioManager.isMusicActive()) { 
Log.e(TAG, "isMusicActive"); 
playButton.setVisibility(View.GONE); 
pauseButton.setVisibility(View.VISIBLE); 
isPlayMusic = true; 
} else { 
Log.e(TAG, "Music Not Active"); 
playButton.setVisibility(View.VISIBLE); 
pauseButton.setVisibility(View.GONE); 
isPlayMusic = false; 
} 
} 

 

 

// 

 

public void audioPauseOnClick(View view) { 
 
try{ 
String keyCommand = "input keyevent " + KeyEvent.KEYCODE_MEDIA_PAUSE; 
Runtime runtime = Runtime.getRuntime(); 
Process proc = runtime.exec(keyCommand); 
} catch(IOException e){ 
} 
 
final Instrumentation m_Instrumentation = new Instrumentation(); 
 
new Thread(new Runnable() { 
@Override 
public void run() { 
m_Instrumentation.sendKeySync(new KeyEvent(KeyEvent.KEYCODE_MEDIA_PAUSE, KeyEvent.KEYCODE_1) ); 
} 
}).start(); 
 
new Handler().postDelayed(new Runnable() { 
public void run() { 
playOrPause(); 
} 
}, 1000); 
 
 
 
} 
 

 

// 

public void audioPlayOnClick(View view) { 
try{ 
String keyCommand = "input keyevent " + KeyEvent.KEYCODE_MEDIA_PLAY; 
Runtime runtime = Runtime.getRuntime(); 
Process proc = runtime.exec(keyCommand); 
} catch(IOException e){ 
} 
 
final Instrumentation m_Instrumentation = new Instrumentation(); 
 
new Thread(new Runnable() { 
@Override 
public void run() { 
m_Instrumentation.sendKeySync(new KeyEvent(KeyEvent.KEYCODE_MEDIA_PLAY, KeyEvent.KEYCODE_1) ); 
} 
}).start(); 
new Handler().postDelayed(new Runnable() { 
public void run() { 
//设置了延时，因为有时候会有延迟反应 
playOrPause(); 
} 
}, 1000); 
} 

 

public void audioPreviousOnClick(View view) { 
try{ 
String keyCommand = "input keyevent " + KeyEvent.KEYCODE_MEDIA_PREVIOUS; 
Runtime runtime = Runtime.getRuntime(); 
Process proc = runtime.exec(keyCommand); 
} catch(IOException e){ 
} 
 
final Instrumentation m_Instrumentation = new Instrumentation(); 
 
new Thread(new Runnable() { 
@Override 
public void run() { 
m_Instrumentation.sendKeySync(new KeyEvent(KeyEvent.KEYCODE_MEDIA_PREVIOUS, KeyEvent.KEYCODE_1) ); 
} 
}).start(); 
 
new Handler().postDelayed(new Runnable() { 
public void run() { 
// Log.e(TAG, "Awning fully closed. " ); 
playOrPause(); 
 
} 
}, 1000); 
} 
 

 

public void audioNextOnClick(View view) { 
try{ 
String keyCommand = "input keyevent " + KeyEvent.KEYCODE_MEDIA_NEXT; 
Runtime runtime = Runtime.getRuntime(); 
Process proc = runtime.exec(keyCommand); 
} catch(IOException e){ 
} 
 
final Instrumentation m_Instrumentation = new Instrumentation(); 
 
new Thread(new Runnable() { 
@Override 
public void run() { 
m_Instrumentation.sendKeySync(new KeyEvent(KeyEvent.KEYCODE_MEDIA_NEXT, KeyEvent.KEYCODE_1) ); 
} 
}).start(); 
 
new Handler().postDelayed(new Runnable() { 
public void run() { 
 
playOrPause(); 
 
} 
}, 1000); 
} 

标签：Instrumentation,外接,KeyEvent,void,KEYCODE,public,new,Android,音频
来源： https://blog.csdn.net/weixin_43805368/article/details/113844529