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Android实现添加耳机状态图标的方法

一、背景介绍

在Android系统中，状态栏是用户获取设备信息和通知的关键区域，原生的Android系统并不提供耳机插入或未插入的状态指示，本文将详细介绍如何在Android中实现耳机状态图标的显示，包括必要的资源准备、代码修改以及广播接收器的设置。

二、准备工作

资源文件准备

首先需要在frameworks/base/core/res/res/drawable-mdpi目录下添加一个名为stat_sys_headset.png的资源文件，这个文件可以根据设备的分辨率进行相应的调整，确保其在不同设备上的显示效果一致。

字符串标记添加

在frameworks/base/core/res/res/values/config.xml文件中，添加耳机相关的字符串标记：

     <string-array name="config_statusBarIcons">
         <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">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>

三、代码修改

1. StatusBarPolicy.java 文件修改

打开frameworks/base/services/java/com/android/server/status/StatusBarPolicy.java文件，进行如下修改：

     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;
         //HeadSet
         private IBinder mHeadSetPlugIcon;
         private IconData mHeadSetPlugIconData;
         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);
                 } else if (action.equals(Intent.ACTION_HEADSET_PLUG)) {
                     updateHeadset(intent);
                 } 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();
             //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);
             IntentFilter filter = new IntentFilter();
             filter.addAction(Intent.ACTION_TIME_TICK);
             filter.addAction(Intent.ACTION_ALARM_CHANGED);
             filter.addAction(Intent.ACTION_HEADSET_PLUG);
             filter.addAction(Intent.ACTION_SYNC_STATE_CHANGED);
             mContext.registerReceiver(mIntentReceiver, filter, null, mHandler);
         }
         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);
         }
     }

2. PhoneStatusBarPolicy.java 文件修改（可选）

如果需要支持带MIC的耳机识别，可以在frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarPolicy.java文件中进行如下修改：

     public class PhoneStatusBarPolicy extends StatusBarPolicy {
         @Override
         public void updateHeadset(Intent intent) {
             final String action = intent.getAction();
             final int state = intent.getIntExtra("state", 4);
             final int mic = intent.getIntExtra("microphone", 4);
             switch (state) {
                 case 0:
                     try {
                         mService.setIconVisibility("headset", false);
                     } catch (Exception e) {
                         //Log.i("StatusBar Headset", "frist time to run");
                     }
                     break;
                 case 1:
                     if (mic == 1)
                         mService.setIcon("headset", R.drawable.stat_sys_headset_mic, 0, mContext.getResources().getString(R.string.headset_enabled));
                     else
                         mService.setIcon("headset", R.drawable.stat_sys_headset, 0, mContext.getResources().getString(R.string.headset_enabled));
                     mService.setIconVisibility("headset", true);
                     break;
             }
         }
     }

四、归纳与展望

通过以上步骤，我们可以在Android系统中成功添加耳机状态图标，并在耳机插入或拔出时更新状态栏显示，这一功能不仅提升了用户体验，还增加了系统的可用性，我们可以尝试更多定制化的状态栏图标，以满足不同用户的需求。

到此，以上就是小编对于“android实现添加耳机状态图标的方法”的问题就介绍到这了，希望介绍的几点解答对大家有用，有任何问题和不懂的，欢迎各位朋友在评论区讨论，给我留言。