有时我们需要程序模拟按钮或点击，而手机本身又没有，哪么可以采取其它方式 模拟实现，最后再去实际设备去测试（前期一般都拿不到设备）；

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

 

AudioManager注册一个MediaButtonReceiver() ;

		//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