今天就跟大家聊聊有关怎么在Android 8.0中实现慢充和快充提示语，可能很多人都不太了解，为了让大家更加了解，小编给大家总结了以下内容，希望大家根据这篇文章可以有所收获。
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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;
}看完上述内容，你们对怎么在Android 8.0中实现慢充和快充提示语有进一步的了解吗？如果还想了解更多知识或者相关内容，请关注创新互联行业资讯频道，感谢大家的支持。
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