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。