1. 更新总流程

状态栏电池图标更新总流程如下(以更新电池电量为例)：

BatteryControllerImpl.onReceive -> fireBatteryLevelChanged -> BatteryMeterViewController.onBatteryLevelChanged

->BatteryMeterView.onBatteryLevelChanged -> ThemedBatteryDrawable.setBatteryLevel -> invalidateSelf

首先由BatteryControllerImpl接收广播(主要有ACTION_BATTERY_CHANGED、ACTION_POWER_SAVE_MODE_CHANGED等)去更新电池相关信息，如

电量、充电速度、充电状态、省电模式等信息。然后将接收到的信息通过回调callback更新至电池图标上，即BatterMeterView中。最后BatteryMeterView将

接收到的信息更新至电池图标对应的drawable(ThemedBatteryDrawable)，后者更新信息后进行刷新，从而达到更新电池图标的目标。

2. 注意

BatteryControllerImpl回调callback将充电信息更新至BatteryMeterViewController时，后者实际上只使用了level和pluggedIn这两个参数。充电信息更新至

BatteryMeterView中时，可以看到是否处于充电状态取决于pluggedIn。所以可能会出现哪怕是已经充满了电、或者只是插入了otg，图标也会显示正在充电的

情况。

SystemUI/src/com/android/systemui/statusbar/policy/BatteryControllerImpl.java

402 protected void fireBatteryLevelChanged() {

403 synchronized (mChangeCallbacks) {

404 final int N = mChangeCallbacks.size();

405 for (int i = 0; i < N; i++) {

更新充电参数:mLevel, mPluggedIn, mCharging

406 mChangeCallbacks.get(i).onBatteryLevelChanged(mLevel, mPluggedIn, mCharging);

407 }

408 }

409 }

SystemUI/src/com/android/systemui/battery/BatteryMeterViewController.java

71 private final BatteryController.BatteryStateChangeCallback mBatteryStateChangeCallback =

72 new BatteryController.BatteryStateChangeCallback() {

73 @Override

74 public void onBatteryLevelChanged(int level, boolean pluggedIn, boolean charging) {

将level和pluggedIn更新至BatteryMeterView

75 mView.onBatteryLevelChanged(level, pluggedIn);

76 }

SystemUI/src/com/android/systemui/battery/BatteryMeterView.java

195 void onBatteryLevelChanged(int level, boolean pluggedIn) {

charging取决于pluggedIn

196 mDrawable.setCharging(pluggedIn);

197 mDrawable.setChargingSpeed(mChargingSpeed); // UNISOC: Modify for bug 1838475

198 mDrawable.setBatteryLevel(level);

3. 排查

如果状态栏电池图标信息显示有误，比如电量、充电状态等，可按更新流程进行排查。

3.1 排查BatteryControllerImpl是否有接收到对应广播去更新充电信息

SystemUI/src/com/android/systemui/statusbar/policy/BatteryControllerImpl.java

198 @Override

199 public void onReceive(final Context context, Intent intent) {

200 final String action = intent.getAction();

201 if (action.equals(Intent.ACTION_BATTERY_CHANGED)) {

根据广播更新充电信息

202 if (mTestMode && !intent.getBooleanExtra(“testmode”, false)) return;

203 mHasReceivedBattery = true;

204 mLevel = (int)(100f

205 * intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0)

206 / intent.getIntExtra(BatteryManager.EXTRA_SCALE, 100));

207 mPluggedIn = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0) != 0;

208 mPluggedInWireless = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0)

209 == BatteryManager.BATTERY_PLUGGED_WIRELESS;

210

211 final int status = intent.getIntExtra(BatteryManager.EXTRA_STATUS,

212 BatteryManager.BATTERY_STATUS_UNKNOWN);

213 mCharged = status == BatteryManager.BATTERY_STATUS_FULL;

214 mCharging = mCharged || status == BatteryManager.BATTERY_STATUS_CHARGING;

…

230 final BatteryStatus batteryStatus = new BatteryStatus(intent);

231 int chargingSpeed = batteryStatus.getChargingSpeed(context);

3.2 排查BatteryMeterViewController中实现的对应callback是否有被回调

SystemUI/src/com/android/systemui/battery/BatteryMeterViewController.java

71 private final BatteryController.BatteryStateChangeCallback mBatteryStateChangeCallback =

72 new BatteryController.BatteryStateChangeCallback() {

73 @Override

74 public void onBatteryLevelChanged(int level, boolean pluggedIn, boolean charging) {

更新电量、充电状态

75 mView.onBatteryLevelChanged(level, pluggedIn);

76 }

77

78 /* UNISOC: Modify for bug 1838475 @{ */

79 @Override

80 public void onChargingSpeedChanged(int chargingSpeed) {

更新充电速度

81 mView.onChargingSpeedChanged(chargingSpeed);

82 }

83 /* @} */

84

85 @Override

86 public void onPowerSaveChanged(boolean isPowerSave) {

更新省电模式

87 mView.onPowerSaveChanged(isPowerSave);

88 }

89

90 @Override

91 public void onBatteryUnknownStateChanged(boolean isUnknown) {

更新电池unKnown状态

92 mView.onBatteryUnknownStateChanged(isUnknown);

93 }

94 };

3.3 排查电池信息是否有更新至BatteryMeterView，并提交更新至drawable中

SystemUI/src/com/android/systemui/battery/BatteryMeterView.java

195 void onBatteryLevelChanged(int level, boolean pluggedIn) {

drawable中更新充电状态

196 mDrawable.setCharging(pluggedIn);

drawable中更新充电速度

197 mDrawable.setChargingSpeed(mChargingSpeed); // UNISOC: Modify for bug 1838475

drawable中更新充电电量

198 mDrawable.setBatteryLevel(level);

199 mCharging = pluggedIn;

200 mLevel = level;

更新电量百分比

201 updatePercentText();

202 }