Android 8.0 慢充和快充提示语的实现原理

<string name="keyguard_plugged_in" msgid="89308975354638682">"正在充电"</string>  <string name="keyguard_plugged_in_charging_fast" msgid="8869226755413795173">"正在快速充电"</string>  <string name="keyguard_plugged_in_charging_slowly" msgid="6637043106038550407">"正在慢速充电"</string>

<!-- When the lock screen is showing and the phone plugged in, and the battery is not fully charged, and it's plugged into a fast charger, say that it's charging fast. --> <string name="keyguard_plugged_in_charging_fast">Charging rapidly</string>

<!-- When the lock screen is showing and the phone plugged in, and the battery is not fully charged, say that it's charging. --> <string name="keyguard_plugged_in">Charging</string>

<!-- When the lock screen is showing and the phone plugged in, and the battery is not fully charged, and it's plugged into a slow charger, say that it's charging slowly. --> <string name="keyguard_plugged_in_charging_slowly">Charging slowly</string>

•public static final String EXTRA_MAX_CHARGING_CURRENT = “max_charging_current”;•public static final String EXTRA_MAX_CHARGING_VOLTAGE = “max_charging_voltage”;

frameworks/base/services/core/java/com/android/server/BatteryService.java// 发送电池广播事件private void sendIntentLocked() {  // Pack up the values and broadcast them to everyone  final Intent intent = new Intent(Intent.ACTION_BATTERY_CHANGED);  intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY      | Intent.FLAG_RECEIVER_REPLACE_PENDING);.......intent.putExtra(BatteryManager.EXTRA_MAX_CHARGING_CURRENT, mBatteryProps.maxChargingCurrent);intent.putExtra(BatteryManager.EXTRA_MAX_CHARGING_VOLTAGE, mBatteryProps.maxChargingVoltage);

adb shell cat /sys/class/power_supply/battery/current_maxadb shell cat /sys/class/power_supply/battery/current_max30000001

adb shell cat /sys/class/power_supply/battery/voltage_maxadb shell cat /sys/class/power_supply/battery/voltage_max50000001

system/core/healthd/BatteryMonitor.cpp#define POWER_SUPPLY_SYSFS_PATH "/sys/class/" POWER_SUPPLY_SUBSYSTEMpath.appendFormat("%s/%s/voltage_max", POWER_SUPPLY_SYSFS_PATH,mChargerNames[i].string());

private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {    ....    } else if (Intent.ACTION_BATTERY_CHANGED.equals(action)) {        final int status = intent.getIntExtra(EXTRA_STATUS, BATTERY_STATUS_UNKNOWN);        final int plugged = intent.getIntExtra(EXTRA_PLUGGED, 0);        final int level = intent.getIntExtra(EXTRA_LEVEL, 0);        final int health = intent.getIntExtra(EXTRA_HEALTH, BATTERY_HEALTH_UNKNOWN);        final int maxChargingMicroAmp = intent.getIntExtra(EXTRA_MAX_CHARGING_CURRENT, -1);        int maxChargingMicroVolt = intent.getIntExtra(EXTRA_MAX_CHARGING_VOLTAGE, -1);        final int maxChargingMicroWatt;        if (maxChargingMicroVolt <= 0) {          maxChargingMicroVolt = DEFAULT_CHARGING_VOLTAGE_MICRO_VOLT;        }        if (maxChargingMicroAmp > 0) {          // Calculating muW = muA * muV / (10^6 mu^2 / mu); splitting up the divisor          // to maintain precision equally on both factors.          maxChargingMicroWatt = (maxChargingMicroAmp / 1000)              * (maxChargingMicroVolt / 1000);        } else {          maxChargingMicroWatt = -1;        }        final Message msg = mHandler.obtainMessage(            MSG_BATTERY_UPDATE, new BatteryStatus(status, level, plugged, health,                maxChargingMicroWatt));        mHandler.sendMessage(msg);

protected class BaseKeyguardCallback extends KeyguardUpdateMonitorCallback {    public static final int HIDE_DELAY_MS = 5000;    private int mLastSuccessiveErrorMessage = -1;    @Override    public void onRefreshBatteryInfo(KeyguardUpdateMonitor.BatteryStatus status) {      boolean isChargingOrFull = status.status == BatteryManager.BATTERY_STATUS_CHARGING          || status.status == BatteryManager.BATTERY_STATUS_FULL;      boolean wasPluggedIn = mPowerPluggedIn;      mPowerPluggedIn = status.isPluggedIn() && isChargingOrFull;      mPowerCharged = status.isCharged();      mChargingWattage = status.maxChargingWattage;      mChargingSpeed = status.getChargingSpeed(mSlowThreshold, mFastThreshold);      updateIndication();      if (mDozing) {        if (!wasPluggedIn && mPowerPluggedIn) {          showTransientIndication(computePowerIndication());          hideTransientIndicationDelayed(HIDE_DELAY_MS);        } else if (wasPluggedIn && !mPowerPluggedIn) {          hideTransientIndication();        }      }    }=====================================================================================================  public static class BatteryStatus {    public static final int CHARGING_UNKNOWN = -1;    public static final int CHARGING_SLOWLY = 0;    public static final int CHARGING_REGULAR = 1;    public static final int CHARGING_FAST = 2;    public final int status;    public final int level;    public final int plugged;    public final int health;    public final int maxChargingWattage;    public BatteryStatus(int status, int level, int plugged, int health,        int maxChargingWattage) {      this.status = status;      this.level = level;      this.plugged = plugged;      this.health = health;      this.maxChargingWattage = maxChargingWattage;    }  public final int getChargingSpeed(int slowThreshold, int fastThreshold) {    return maxChargingWattage <= 0 ? CHARGING_UNKNOWN :        maxChargingWattage < slowThreshold ? CHARGING_SLOWLY :        maxChargingWattage > fastThreshold ? CHARGING_FAST :        CHARGING_REGULAR;  }

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/KeyguardIndicationController.java    int chargingId;    switch (mChargingSpeed) {      case KeyguardUpdateMonitor.BatteryStatus.CHARGING_FAST:        chargingId = hasChargingTime            ? R.string.keyguard_indication_charging_time_fast            : R.string.keyguard_plugged_in_charging_fast;        break;      case KeyguardUpdateMonitor.BatteryStatus.CHARGING_SLOWLY:        chargingId = hasChargingTime            ? R.string.keyguard_indication_charging_time_slowly            : R.string.keyguard_plugged_in_charging_slowly;        break;      default:        chargingId = hasChargingTime            ? R.string.keyguard_indication_charging_time            : R.string.keyguard_plugged_in;        break;    }