原生态的android系统是没有耳机插入或未插入的状态指示的，本文就是讲解如何添加耳机插入的状态指示。效果图如下：
如图，当插入耳机后，在status bar上出现了一个耳机的图标。
这个耳机的图标和sim卡信号等图标在status bar的右边，因此这个实现肯定不是通过notification实现的，那么添加这个功能只能在framwork里面寻找了。具体的修改步骤如下：
1.在frameworks/base/core/res/res/drawable-mdpi目录先添加一个stat_sys_headset.png资源文件。这里面资源文件的目录要根据设备的分辨率来确定，我的设备是HVGA的，因此资源文件放在drawable-mdpi目录下。
2.修改frameworks/base/services/java/com/android/server/status/StatusBarPolicy.java
public class StatusBarPolicy { private static final String TAG = "StatusBarPolicy" ; private static StatusBarPolicy sInstance; ..... // alarm clock // Icon lit when clock is set private IBinder mAlarmClockIcon; private IconData mAlarmClockIconData; //modify here start //HeadSet private IBinder mHeadSetPlugIcon; private IconData mHeadSetPlugIconData; //modify here end ..... private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (action.equals(Intent.ACTION_TIME_TICK)) { updateClock(); } ..... else if (action.equals(Intent.ACTION_ALARM_CHANGED)) { updateAlarm(intent); } //modify here start else if (action.equals(Intent.ACTION_HEADSET_PLUG)) { updateHeadset(intent); } //modify here end else if (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(); .... //modify here start //HeadSet mHeadSetPlugIconData = IconData.makeIcon( "headset" , null ,com.android.internal.R.drawable.stat_sys_headset, 0 , 0 ); mHeadSetPlugIcon = service.addIcon(mHeadSetPlugIconData, null ); service.setIconVisibility(mHeadSetPlugIcon, false ); //modify here end .... IntentFilter filter = new IntentFilter(); // Register for Intent broadcasts for... filter.addAction(Intent.ACTION_TIME_TICK); .... //modify here start filter.addAction(Intent.ACTION_HEADSET_PLUG); //modify here end .... } //modify here start private final void updateHeadset(Intent intent) { Slog.d(TAG, "updateHeadset: state=" + intent.getIntExtra("state" , 0 )); mService.setIconVisibility(mHeadSetPlugIcon, (intent.getIntExtra("state" , 0 ) == 1 )?true :false ); } //modify here end ..... }
3.修改frameworks/base/core/res/res/values/arrays.xml
<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 > <!-- modify here start. --> <item > <xliff :g id ="id"> headset</xliff :g> </item > <!-- modify here end --> <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 0 , 0 );”中的第一个参数。“<item > <xliff :g id ="id"> headset</xliff :g> </item > ”这个语句的位置于图标在status bar上显示的位置有关。
按照这3个步骤修改后重新编译源码之后，就可以看到如上图的效果了。
