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在Android手机上插入耳机后，状态栏会显示耳机图标，之前手机都是在手机最上面状态栏右边的区域显示，在Android 7.1.1上，插入耳机后不会显示这个图标，而是在最左边有个耳机的通知，这个通知是在下面的类中监听耳机插入或拔出的广播来显示或取消插入耳机的通
packages/services/Telecomm/src/com/android/server/telecom/TtyManager.java
@Override
public void onWiredHeadsetPluggedInChanged(boolean oldIsPluggedIn, boolean newIsPluggedIn) {
Log.v(this, "onWiredHeadsetPluggedInChanged");
updateCurrentTtyMode();
if (newIsPluggedIn) {
showHeadSetPlugin();
} else {
cancelHeadSetPlugin();
}
}
void showHeadSetPlugin() {
Log.v(TtyManager.this, "showHeadSetPlugin()...");
String titleText = mContext.getString(
R.string.headset_plugin_view_title);
String expandedText = mContext.getString(
R.string.headset_plugin_view_text);
Notification notification = new Notification();
notification.icon = android.R.drawable.stat_sys_headset;
notification.flags |= Notification.FLAG_NO_CLEAR;
notification.tickerText = titleText;
// create the target network operators settings intent
Intent intent = new Intent("android.intent.action.NO_ACTION");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
PendingIntent pi = PendingIntent.getActivity(mContext, 0, intent, 0);
notification.setLatestEventInfo(mContext, titleText, expandedText, pi);
mNotificationManager.notify(HEADSET_PLUGIN_NOTIFICATION, notification);
}
void cancelHeadSetPlugin() {
Log.v(TtyManager.this, "cancelHeadSetPlugin()...");
mNotificationManager.cancel(HEADSET_PLUGIN_NOTIFICATION);
}实际上在状态栏右边区域也有显示一些系统图标（蓝牙、闹钟等）的位置，接下来就根据源码说下怎么在状态栏添加显示系统图标，以耳机图标为例：
1、在系统framework配置文件中添加需要显示的图标
frameworks/base/core/res/res/values/config.xml
<string-array name="config_statusBarIcons">
<item><xliff:g id="id">@string/status_bar_headset</xliff:g></item>
</string-array>
<string translatable="false" name="status_bar_headset">headset</string>frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarPolicy.java
public PhoneStatusBarPolicy(Context context, StatusBarIconController iconController,
CastController cast, HotspotController hotspot, UserInfoController userInfoController,
BluetoothController bluetooth, RotationLockController rotationLockController,
DataSaverController dataSaver) {
...
mSlotBluetooth = context.getString(com.android.internal.R.string.status_bar_bluetooth);
...
mSlotHeadset = context.getString(com.android.internal.R.string.status_bar_headset);
// listen for broadcasts
IntentFilter filter = new IntentFilter();
filter.addAction(AlarmManager.ACTION_NEXT_ALARM_CLOCK_CHANGED);
filter.addAction(AudioManager.RINGER_MODE_CHANGED_ACTION);
filter.addAction(AudioManager.INTERNAL_RINGER_MODE_CHANGED_ACTION);
filter.addAction(AudioManager.ACTION_HEADSET_PLUG); //监听耳机插入广播
filter.addAction(TelephonyIntents.ACTION_SIM_STATE_CHANGED);
filter.addAction(TelecomManager.ACTION_CURRENT_TTY_MODE_CHANGED);
filter.addAction(Intent.ACTION_MANAGED_PROFILE_AVAILABLE);
filter.addAction(Intent.ACTION_MANAGED_PROFILE_UNAVAILABLE);
filter.addAction(Intent.ACTION_MANAGED_PROFILE_REMOVED);
mContext.registerReceiver(mIntentReceiver, filter, null, mHandler);
// bluetooth status
updateBluetooth();
...
} private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(AlarmManager.ACTION_NEXT_ALARM_CLOCK_CHANGED)) {
updateAlarm();
} else if (action.equals(AudioManager.ACTION_HEADSET_PLUG)) {
updateHeadsetPlug(intent); //更新耳机图标
}
}
};调用updateHeadsetPlug更新耳机图标
private void updateHeadsetPlug(Intent intent) {
boolean connected = intent.getIntExtra("state", 0) != 0;
boolean hasMic = intent.getIntExtra("microphone", 0) != 0;
if (connected) {
String contentDescription = mContext.getString(hasMic
? R.string.accessibility_status_bar_headset
: R.string.accessibility_status_bar_headphones);
mIconController.setIcon(mSlotHeadset, hasMic ? R.drawable.ic_headset_mic
: R.drawable.ic_headset, contentDescription);
mIconController.setIconVisibility(mSlotHeadset, true);
} else {
mIconController.setIconVisibility(mSlotHeadset, false);
}
}frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarIconController.java
private void handleSet(int index, StatusBarIcon icon) {
int viewIndex = getViewIndex(index);
StatusBarIconView view = (StatusBarIconView) mStatusIcons.getChildAt(viewIndex);
view.set(icon); //这个地方有个坑，继续往下看
view = (StatusBarIconView) mStatusIconsKeyguard.getChildAt(viewIndex);
view.set(icon);
applyIconTint();
}frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/StatusBarIconView.java
/**
* Returns whether the set succeeded.
*/
public boolean set(StatusBarIcon icon) {
...
if (!visibilityEquals) {
setVisibility(icon.visible && !mBlocked ? VISIBLE : GONE); //坑来了，除了根据当前view是否可见，还要根据mBlocked确定是否显示
}
return true;
}frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarIconController.java
private void addSystemIcon(int index, StatusBarIcon icon) {
String slot = getSlot(index);
int viewIndex = getViewIndex(index);
boolean blocked = mIconBlacklist.contains(slot);
StatusBarIconView view = new StatusBarIconView(mContext, slot, null, blocked);
view.set(icon);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT, mIconSize);
lp.setMargins(mIconHPadding, 0, mIconHPadding, 0);
mStatusIcons.addView(view, viewIndex, lp);
view = new StatusBarIconView(mContext, slot, null, blocked);
view.set(icon);
mStatusIconsKeyguard.addView(view, viewIndex, new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT, mIconSize));
applyIconTint();
} frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarIconController.java
@Override
public void onTuningChanged(String key, String newValue) {
if (!ICON_BLACKLIST.equals(key)) {
return;
}
mIconBlacklist.clear();
mIconBlacklist.addAll(getIconBlacklist(newValue));
ArrayList<StatusBarIconView> views = new ArrayList<StatusBarIconView>();
// Get all the current views.
for (int i = 0; i < mStatusIcons.getChildCount(); i++) {
views.add((StatusBarIconView) mStatusIcons.getChildAt(i));
}
// Remove all the icons.
for (int i = views.size() - 1; i >= 0; i--) {
removeIcon(views.get(i).getSlot());
}
// Add them all back
for (int i = 0; i < views.size(); i++) {
setIcon(views.get(i).getSlot(), views.get(i).getStatusBarIcon());
}
}frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarIconController.java
public static ArraySet<String> getIconBlacklist(String blackListStr) {
ArraySet<String> ret = new ArraySet<String>();
if (blackListStr == null) {
blackListStr = "rotate,headset"; //headset默认是黑名单里的，所以没有显示出来
}
String[] blacklist = blackListStr.split(",");
for (String slot : blacklist) {
if (!TextUtils.isEmpty(slot)) {
ret.add(slot);
}
}
return ret;
}