为android添加耳机状态图标

 http://blog.csdn.net/litton_van/article/details/6311884

 

 

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", null0, 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。