如上一首，下一首，暂停等，手机上是没有的，但有些设备上是有的，所以我们只能模拟；
模拟按钮一种可以采用adb 命令；
别一种采用程序，这里主要讲采用程序的方法：
通过Runtime实现，模拟媒体上一首代码如下：
try
{
String keyCommand = "input keyevent " + KeyEvent.KEYCODE_MEDIA_NEXT;
Runtime runtime = Runtime.getRuntime();
Process proc = runtime.exec(keyCommand);
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
模拟上一首
try
{
String keyCommand = "input keyevent " + KeyEvent.KEYCODE_MEDIA_PREVIOUS;
Runtime runtime = Runtime.getRuntime();
Process proc = runtime.exec(keyCommand);
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
如果需要模拟其它按键只需将KeyEvent.KEYCODE_MEDIA_PREVIOUS替换成其它键值即可。
下面讲一下 媒体键监听：
首先我们定义一个广播类 MediaButtonReceive 它继承广播接收器类(BroadbcastReceiver)，那么它就具备了BroadbcastReceiver类的使用方式，
点击MEDIA_BUTTON发送的Intent Action 为：ACTION_MEDIA_BUTTON ="android.intent.action.MEDIA_BUTTON"
Intent 附加值为(Extra)点击MEDIA_BUTTON的按键码 ：
//获得KeyEvent对象
KeyEvent keyEvent = (KeyEvent)intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
//获得Action
String intentAction = intent.getAction() ;
在取得音频焦点时，在AudioManager对象注册一个MediaoButtonRecevie，使它成为MEDIA_BUTTON的唯一接收器 也就是说只有它能收到，其他的都收不到这个广播了，否则的话会造成的混乱，在失去音频焦点时反注册，这样才能保证其它应用能正常使用媒体键；
该广播必须在AndroidManifest.xml文件中进行声明，否则就监听不到该MEDIA_BUTTON广播了
在AudioManager对象注册一个MediaoButtonRecevie；
下面看一下MediaButtonReceiver类 的实现：
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.view.KeyEvent;
import android.widget.Toast;
public class MediaButtonReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// 获得Action
String intentAction = intent.getAction();
// 获得KeyEvent对象
KeyEvent keyEvent = (KeyEvent) intent
.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
Log.e("MediaButtonReceiver", "Action ---->" + intentAction
+ " KeyEvent----->" + keyEvent.toString());
if (Intent.ACTION_MEDIA_BUTTON.equals(intentAction)) {
boolean isActionUp = (keyEvent.getAction()==KeyEvent.ACTION_UP);
// 这里会收到两次，我们只判断 up
if(!isActionUp)
{
return;
}
// 获得按键字节码
int keyCode = keyEvent.getKeyCode();
// 按下 / 松开 按钮
int keyAction = keyEvent.getAction();
// 获得事件的时间
long downtime = keyEvent.getEventTime();
// 获取按键码 keyCode
StringBuilder sb = new StringBuilder();
// 这些都是可能的按键码 ， 打印出来用户按下的键
if (KeyEvent.KEYCODE_MEDIA_NEXT == keyCode) {
sb.append("KEYCODE_MEDIA_NEXT");
Toast.makeText(context,
"receive KEYCODE_MEDIA_NEXT",
Toast.LENGTH_SHORT).show();
}
if (KeyEvent.KEYCODE_MEDIA_PREVIOUS == keyCode) {
sb.append("KEYCODE_MEDIA_PREVIOUS");
Toast.makeText(context,
"receive KEYCODE_MEDIA_PREVIOUS",
Toast.LENGTH_SHORT).show();
}
// 输出点击的按键码
Log.e("MediaButtonReceiver", sb.toString());
}
}
}在AndroidManifest.xml声明我们定义的广播类，它需要通过AudioManager对象注册
//获得AudioManager对象
AudioManager mAudioManager =(AudioManager)getSystemService(Context.AUDIO_SERVICE);
//构造一个ComponentName，指向MediaoButtonReceiver类
//下面为了叙述方便，我直接使用ComponentName类来替代MediaoButtonReceiver类
ComponentName mbCN = new ComponentName(getPackageName(),MediaButtonReceiver.class.getName());
//注册一个MedioButtonReceiver广播监听
mAudioManager.registerMediaButtonEventReceiver(mbCN);下面看一下调用类的实现MainActivity .java ：
import com.example.ydsdkdemo.R;
import android.media.AudioManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends Activity {
private Context mContext;
private AudioManager audioManager;
private ComponentName mComponentName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = this;
init();
}
private void init() {
audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
mComponentName = new ComponentName(getPackageName(),
MediaButtonReceiver.class.getName());
if (AudioManager.AUDIOFOCUS_REQUEST_GRANTED == audioManager
.requestAudioFocus(focusChangeListener,
AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN)) {
audioManager.registerMediaButtonEventReceiver(mComponentName);
}
try
{
String keyCommand = "input keyevent " + KeyEvent.KEYCODE_MEDIA_NEXT;
Runtime runtime = Runtime.getRuntime();
Process proc = runtime.exec(keyCommand);
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void lastOne(View v)
{
try
{
String keyCommand = "input keyevent " + KeyEvent.KEYCODE_MEDIA_PREVIOUS;
Runtime runtime = Runtime.getRuntime();
Process proc = runtime.exec(keyCommand);
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void nextOne(View v)
{
try
{
String keyCommand = "input keyevent " + KeyEvent.KEYCODE_MEDIA_NEXT;
Runtime runtime = Runtime.getRuntime();
Process proc = runtime.exec(keyCommand);
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void voiceSearch(View v)
{
try
{
String keyCommand = "input keyevent " + KeyEvent.KEYCODE_MEDIA_RECORD;
Runtime runtime = Runtime.getRuntime();
Process proc = runtime.exec(keyCommand);
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//焦点问题
private AudioManager.OnAudioFocusChangeListener focusChangeListener = new AudioManager.OnAudioFocusChangeListener() {
@Override
public void onAudioFocusChange(int focusChange) {
switch (focusChange) {
case AudioManager.AUDIOFOCUS_LOSS:// 长时间失去
Toast.makeText(mContext,
"receive AudioManager.AUDIOFOCUS_LOSS",
Toast.LENGTH_SHORT).show();
audioManager.unregisterMediaButtonEventReceiver(mComponentName);
audioManager.abandonAudioFocus(focusChangeListener);//放弃焦点监听
break;
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:// 短时间失去
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:// 短时间失去，但可以共用
break;
case AudioManager.AUDIOFOCUS_GAIN:// 获得音频焦点
audioManager.registerMediaButtonEventReceiver(mComponentName);
break;
}
}
};
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
audioManager.unregisterMediaButtonEventReceiver(mComponentName);
super.onDestroy();
}
}值得注意的一点时，当我们为一个应用程序注册了MediaoButtonReceiver时，在程序离开时，我们需要取消该
Demo地址:
http://download.csdn.net/detail/q610098308/9147909