在状态栏加入耳机状态监听图标

在android系统级服务启动中，状态栏右边的图标会被初始化，在左边一般显示动态的notification。这里我们要添加一个耳机插拔状态的图标，就应该放在右边，属于frameworks代码：

在android2.3中

frameworks/base/core/res/res/drawable-mdpi 　　　　　　　　　　　　加入要显示的图标 status_sys_headset.png

frameworks/base/core/res/res/values/config.xml 加入耳机字符串标记(在下面用到)

<string-array name="config_statusBarIcons">
<item><xliff:g id="id">ime</xliff:g></item>
<item><xliff:g id="id">sync_failing</xliff:g></item>
<item><xliff:g id="id">sync_active</xliff:g></item>
<item><xliff:g id="id">gps</xliff:g></item>
<item><xliff:g id="id">bluetooth</xliff:g></item>
<item><xliff:g id="id">nfc</xliff:g></item>
<item><xliff:g id="id">tty</xliff:g></item>
<item><xliff:g id="id">speakerphone</xliff:g></item>
<item><xliff:g id="id">mute</xliff:g></item>
<item><xliff:g id="id">volume</xliff:g></item>

<item ><xliff:g id="id"> headset</xliff:g></item >

<item><xliff:g id="id">wifi</xliff:g></item>
<item><xliff:g id="id">cdma_eri</xliff:g></item>
<item><xliff:g id="id">data_connection</xliff:g></item>
<item><xliff:g id="id">phone_evdo_signal</xliff:g></item>
<item><xliff:g id="id">phone_signal</xliff:g></item>
<item><xliff:g id="id">battery</xliff:g></item>
<item><xliff:g id="id">alarm_clock</xliff:g></item>
<item><xliff:g id="id">secure</xliff:g></item>
<item><xliff:g id="id">clock</xliff:g></item>
</string-array>

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/StatusBarPolicy.java 监听各个事件，处理状态栏图标变化。

模仿其他图标的添加：

private IBinder mHeadSetPlugIcon;
private IconData mHeadSetPlugIconData;

在构造方法里： public StatusBarPolicy(Context context)

mService.setIcon("headset", R.drawable.status_sys_headset, 0);
mService.setIconVisibility("headset", false);

注册广播监听耳机：action tag可以在API文档中查找。

filter.addAction(Intent.ACTION_HEADSET_PLUG);

在广播接收onReceive(Context context, Intent intent) :

elseif (action.equals(Intent.ACTION_HEADSET_PLUG)) {
updateHeadset(intent);
}

定义方法改变耳机状态：

private void updateHeadset(Intent intent){

mService.setIconVisibility("headset", (intent.getIntExtra("state", 0) == 1 ) ? true : false)

}

下面时android2.3源码以前的版本添加方式。2.3以后这个已经放到应用中里：

1.在frameworks/base/core/res/res/drawable-mdpi 添加一个status_sys_headset.png。

2.修改frameworks/base/services/java/com/android/server/status/StatusBarPolicy.java

publicclass StatusBarPolicy {
privatestaticfinal String TAG ="StatusBarPolicy" ;

privatestatic StatusBarPolicy sInstance;
.....

// alarm clock
// Icon lit when clock is set
private IBinder mAlarmClockIcon;
private IconData mAlarmClockIconData;

//HeadSet
private IBinder mHeadSetPlugIcon;
private IconData mHeadSetPlugIconData;

.....

private BroadcastReceiver mIntentReceiver =new BroadcastReceiver() {
@Override
publicvoid onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(Intent.ACTION_TIME_TICK)) {
updateClock();
}
.....
elseif (action.equals(Intent.ACTION_ALARM_CHANGED)) {
updateAlarm(intent);
}
elseif (action.equals(Intent.ACTION_HEADSET_PLUG)) {
updateHeadset(intent);
}
elseif (action.equals(Intent.ACTION_SYNC_STATE_CHANGED)) {
updateSyncState(intent);
}
......
};
private StatusBarPolicy(Context context, StatusBarService service) {
mContext = context;
mService = service;
mSignalStrength =new SignalStrength();
if (FeatureOption.MTK_GEMINI_SUPPORT ==true ) {
mSignalStrengthGemini =new SignalStrength();
}
mBatteryStats = BatteryStatsService.getService();

//HeadSet
mHeadSetPlugIconData = IconData.makeIcon(
"headset" ,
null ,com.android.internal.R.drawable.status_sys_headset, 0 , 0 );
mHeadSetPlugIcon = service.addIcon(mHeadSetPlugIconData, null );
service.setIconVisibility(mHeadSetPlugIcon, false );
....

IntentFilter filter =new IntentFilter();

// Register for Intent broadcasts for...
filter.addAction(Intent.ACTION_TIME_TICK);
....
filter.addAction(Intent.ACTION_HEADSET_PLUG);

....

}

privatefinalvoid updateHeadset(Intent intent) {
mService.setIconVisibility(mHeadSetPlugIcon, (intent.getIntExtra("state" , 0 ) ==1 )?true :false);
}

}

3.frameworks/base/core/res/res/values/arrays.xml 加入字段

<string-array name ="status_bar_icon_order">
<item ><xliff :g id ="id"> clock</xliff :g></item >
<item ><xliff :g id ="id"> secure</xliff :g></item >
<item ><xliff :g id ="id"> alarm_clock</xliff :g></item >
<item ><xliff :g id ="id"> battery</xliff :g></item >
<item ><xliff :g id ="id"> phone_signal_2</xliff :g></item >
<item ><xliff :g id ="id"> phone_signal</xliff :g></item >
<item ><xliff :g id ="id"> phone_evdo_signal</xliff :g></item >
<item ><xliff :g id ="id"> data_connection</xliff :g></item >
<item ><xliff :g id ="id"> cdma_eri</xliff :g></item >
<item ><xliff :g id ="id"> tty</xliff :g></item >
<item ><xliff :g id ="id"> volume</xliff :g></item >
<item ><xliff :g id ="id"> mute</xliff :g></item >
<item ><xliff :g id ="id"> speakerphone</xliff :g></item >

<item ><xliff :g id ="id"> headset</xliff :g></item >

<item ><xliff :g id ="id"> wifi</xliff :g></item >
<item ><xliff :g id ="id"> tty</xliff :g></item >
<item ><xliff :g id ="id"> bluetooth</xliff :g></item >
<item ><xliff :g id ="id"> gps</xliff :g></item >
<item ><xliff :g id ="id"> sync_active</xliff :g></item >
<item ><xliff :g id ="id"> sync_failing</xliff :g></item >
<item ><xliff :g id ="id"> ime</xliff :g></item >
</string-array >

　　其中 “ headset”这个字符串就是 “ mHeadSetPlugIconData = IconData.makeIcon( "headset" , null,

com.android.internal.R.drawable.status_sys_headset,0 ,0 );” 或者 mService.setIcon("headset", R.drawable.status_sys_headset, 0);中的第一个参数。“<item > <xliff :g id ="id"> headset</xliff :g> </item > ”这个语句的位置对应图标在状态栏上显示的位置顺序。