1. 慢充和快充提示语

\frameworks\base\packages\SystemUI\res-keyguard\values-zh-rCN

中文提示语

"正在充电"

"正在快速充电"

"正在慢速充电"

英文提示语

\frameworks\base\packages\SystemUI\res-keyguard\values

1.快充充电器充电-显示快速充电字符串

Charging rapidly

2.普通充电电器-显示充电，该同7.0及其以前特性

Charging

3.电脑端或者笔记本端显示-缓慢充电

Charging slowly

2. 原理

根据当前的最大电压和电流计算出电流速度，并进行分类为慢速充电，充电，快速充电

2.1 源代码中的原始数据

•public static final String EXTRA_MAX_CHARGING_CURRENT = “max_charging_current”;

•public static final String EXTRA_MAX_CHARGING_VOLTAGE = “max_charging_voltage”;

发送“电池广播”位置将最大电流和电压上发应用层，这里主要一些8.1以上新增的数据，7.0以前有这个数据但是framework层没有使用

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);

2.2 adb shell 查看linux的文件节点

•获取当前的电流

adb shell cat /sys/class/power_supply/battery/current_max

adb shell cat /sys/class/power_supply/battery/current_max

30000001

•获取当前的电压

adb shell cat /sys/class/power_supply/battery/voltage_max

adb shell cat /sys/class/power_supply/battery/voltage_max

50000001

•具体源码

system/core/healthd/BatteryMonitor.cpp

#define POWER_SUPPLY_SYSFS_PATH "/sys/class/" POWER_SUPPLY_SUBSYSTEM

path.appendFormat("%s/%s/voltage_max", POWER_SUPPLY_SYSFS_PATH,mChargerNames[i].string());

2.3 上层接收广播

frameworks/base/packages/SystemUI/src/com/android/keyguard/KeyguardUpdateMonitor.java

重点看 maxChargingMicroAmp 和 maxChargingMicroVolt 的算法规则

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);

2.4 显示字符串

frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/KeyguardIndicationController.java

事件接收

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;

}

显示字符串

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;

}

总结

以上所述是小编给大家介绍的Android 8.0 慢充和快充提示语的实现原理，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！