使用线控耳机来操控应用功能-优快云博客

本文介绍如何通过广播拦截实现线控耳机按键事件监听，进而控制音乐播放，包括单击、双击、长按等操作，以及如何在应用程序中进行注册、处理消息和取消注册。

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实现原理：通过广播拦截来实现。

（一）定义1个广播拦截器，用来拦截线控耳机按键产生的广播事件。

Java代码

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.KeyEvent;
public class MediaButtonReceiver extends BroadcastReceiver {
/**
* Handler
*/
private Handler handler;
/**
* 构造器.
* @param handler
*/
public MediaButtonReceiver(Handler handler) {
this.handler = handler;
}
@Override
public void onReceive(Context context, Intent intent) {
boolean isActionMediaButton = Intent.ACTION_MEDIA_BUTTON.equals(intent.getAction());
if(!isActionMediaButton) return;
KeyEvent event = (KeyEvent)intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
if(event==null) return;
boolean isActionUp = (event.getAction()==KeyEvent.ACTION_UP);
if(!isActionUp) return;
int keyCode = event.getKeyCode();
long eventTime = event.getEventTime()-event.getDownTime();//按键按下到松开的时长
Message msg = Message.obtain();
msg.what = 100;
Bundle data = new Bundle();
data.putInt("key_code", keyCode);
data.putLong("event_time", eventTime);
msg.setData(data);
handler.sendMessage(msg);
//终止广播(不让别的程序收到此广播，免受干扰)
abortBroadcast();
}
}

import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.KeyEvent; public class MediaButtonReceiver extends BroadcastReceiver { /** * Handler */ private Handler handler; /** * 构造器. * @param handler */ public MediaButtonReceiver(Handler handler) { this.handler = handler; } @Override public void onReceive(Context context, Intent intent) { boolean isActionMediaButton = Intent.ACTION_MEDIA_BUTTON.equals(intent.getAction()); if(!isActionMediaButton) return; KeyEvent event = (KeyEvent)intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT); if(event==null) return; boolean isActionUp = (event.getAction()==KeyEvent.ACTION_UP); if(!isActionUp) return; int keyCode = event.getKeyCode(); long eventTime = event.getEventTime()-event.getDownTime();//按键按下到松开的时长 Message msg = Message.obtain(); msg.what = 100; Bundle data = new Bundle(); data.putInt("key_code", keyCode); data.putLong("event_time", eventTime); msg.setData(data); handler.sendMessage(msg); //终止广播(不让别的程序收到此广播，免受干扰) abortBroadcast(); } }

（二）在主程序的处理：

（1）定义并注册广播服务

Java代码

//初始化Handler对象
MyHandler handler = new MyHandler();
//初始化媒体(耳机)广播对象.
MediaButtonReceiver mediaButtonReceiver = new MediaButtonReceiver(handler);
//注册媒体(耳机)广播对象
IntentFilter intentFilter = new IntentFilter(Intent.ACTION_MEDIA_BUTTON);
intentFilter.setPriority(10000);
registerReceiver(mediaButtonReceiver, intentFilter);

//初始化Handler对象 MyHandler handler = new MyHandler(); //初始化媒体(耳机)广播对象. MediaButtonReceiver mediaButtonReceiver = new MediaButtonReceiver(handler); //注册媒体(耳机)广播对象 IntentFilter intentFilter = new IntentFilter(Intent.ACTION_MEDIA_BUTTON); intentFilter.setPriority(10000); registerReceiver(mediaButtonReceiver, intentFilter);

也可以这样注册广播：

Xml代码

<receiver android:name="MediaButtonReceiver">
<intent-filter android:priority="10000">
<action android:name="android.intent.action.MEDIA_BUTTON" />
</intent-filter>
</receiver>

（2）定义MyHandler和处理广播发回的消息：

Java代码

private class MyHandler extends Handler{
@Override
public void handleMessage(Message msg) {
int what = msg.what;
switch(what){
case 100://单击按键广播
Bundle data = msg.getData();
//按键值
int keyCode = data.getInt("key_code");
//按键时长
long eventTime = data.getLong("event_time");
//设置超过2000毫秒，就触发长按事件
boolean isLongPress = (eventTime>2000);
switch(keyCode){
case KeyEvent.KEYCODE_HEADSETHOOK://播放或暂停
case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE://播放或暂停
playOrPause();
break;
//短按=播放下一首音乐，长按=当前音乐快进
case KeyEvent.KEYCODE_MEDIA_NEXT:
if(isLongPress){
fastNext(1);//自定义
}else{
playNext();//自定义
}
break;
//短按=播放上一首音乐，长按=当前音乐快退
case KeyEvent.KEYCODE_MEDIA_PREVIOUS:
if(isLongPress){
fastPrevious(1);//自定义
}else{
playPrevious();//自定义
}
break;
}
break;
default://其他消息-则扔回上层处理
super.handleMessage(msg);
}
}
}

private class MyHandler extends Handler{ @Override public void handleMessage(Message msg) { int what = msg.what; switch(what){ case 100://单击按键广播 Bundle data = msg.getData(); //按键值 int keyCode = data.getInt("key_code"); //按键时长 long eventTime = data.getLong("event_time"); //设置超过2000毫秒，就触发长按事件 boolean isLongPress = (eventTime>2000); switch(keyCode){ case KeyEvent.KEYCODE_HEADSETHOOK://播放或暂停 case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE://播放或暂停 playOrPause(); break; //短按=播放下一首音乐，长按=当前音乐快进 case KeyEvent.KEYCODE_MEDIA_NEXT: if(isLongPress){ fastNext(1);//自定义 }else{ playNext();//自定义 } break; //短按=播放上一首音乐，长按=当前音乐快退 case KeyEvent.KEYCODE_MEDIA_PREVIOUS: if(isLongPress){ fastPrevious(1);//自定义 }else{ playPrevious();//自定义 } break; } break; default://其他消息-则扔回上层处理 super.handleMessage(msg); } } }

（3）应用程序退出的时候，别忘了取消注册的广播拦截器。

Java代码