本文介绍: 系统rom定制开发中，其中在低电量时，系统会自动关机，这个和不同的平台和底层驱动和硬件都有关系，需要结合这些来实际调整这个值，我们可以通过分析源码中电池服务的代码，然后进行修改如何实现这个功能。经过源码分析，如果满足shouldShutdownLocked(),如果满足关机执行 Intent.ACTION_REQUEST_SHUTDOWN。2、系统中framework修改低电量关机值的核心类。
1、讲在最前面
系统rom定制开发中，其中在低电量时，系统会自动关机，这个和不同的平台和底层驱动和硬件都有关系，需要结合这些来实际调整这个值，我们可以通过分析源码中电池服务的代码，然后进行修改如何实现这个功能。
2、系统中framework修改低电量关机值的核心类
frameworksbaseservicescorejavacomandroidserverBatteryService.java
private final class HealthHalCallback extends IHealthInfoCallback.Stub
implements HealthServiceWrapper.Callback {
@Override public void healthInfoChanged(android.hardware.health.V2_0.HealthInfo props) {
BatteryService.this.update(props);
}
private void update(android.hardware.health.V2_0.HealthInfo info) {
traceBegin("HealthInfoUpdate");
Trace.traceCounter(Trace.TRACE_TAG_POWER, "BatteryChargeCounter",
info.legacy.batteryChargeCounter);
Trace.traceCounter(Trace.TRACE_TAG_POWER, "BatteryCurrent",
info.legacy.batteryCurrent);
synchronized (mLock) {
mRealBatteryLevel = info.legacy.batteryLevel;
if (!mUpdatesStopped) {
mHealthInfo = info.legacy;
// Process the new values.
processValuesLocked(false);
mLock.notifyAll(); // for any waiters on new info
} else {
copy(mLastHealthInfo, info.legacy);
}
}
traceEnd();
}
private void processValuesLocked(boolean force) {
boolean logOutlier = false;
long dischargeDuration = 0;
mBatteryLevelCritical =
mHealthInfo.batteryStatus != BatteryManager.BATTERY_STATUS_UNKNOWN
&& mHealthInfo.batteryLevel <= mCriticalBatteryLevel;
if (mHealthInfo.chargerAcOnline) {
mPlugType = BatteryManager.BATTERY_PLUGGED_AC;
} else if (mHealthInfo.chargerUsbOnline) {
mPlugType = BatteryManager.BATTERY_PLUGGED_USB;
} else if (mHealthInfo.chargerWirelessOnline) {
mPlugType = BatteryManager.BATTERY_PLUGGED_WIRELESS;
} else {
mPlugType = BATTERY_PLUGGED_NONE;
}
if (DEBUG) {
Slog.d(TAG, "Processing new values: "
+ "info=" + mHealthInfo
+ ", mBatteryLevelCritical=" + mBatteryLevelCritical
+ ", mPlugType=" + mPlugType);
}
// Let the battery stats keep track of the current level.
try {
mBatteryStats.setBatteryState(mHealthInfo.batteryStatus, mHealthInfo.batteryHealth,
mPlugType, mHealthInfo.batteryLevel, mHealthInfo.batteryTemperature,
mHealthInfo.batteryVoltage, mHealthInfo.batteryChargeCounter,
mHealthInfo.batteryFullCharge);
} catch (RemoteException e) {
// Should never happen.
}
...
}
private void shutdownIfNoPowerLocked() {
// shut down gracefully if our battery is critically low and we are not powered.
// wait until the system has booted before attempting to display the shutdown dialog.
if (shouldShutdownLocked()) {
/*SPRD : add power debug log start*/
Slog.d(TAG, "Low battery shutdown, batteryLevel : " + mHealthInfo.batteryLevel);
/*SPRD : add power debug log end*/
mHandler.post(new Runnable() {
@Override
public void run() {
if (mActivityManagerInternal.isSystemReady()) {
Intent intent = new Intent(Intent.ACTION_REQUEST_SHUTDOWN);
intent.putExtra(Intent.EXTRA_KEY_CONFIRM, false);
intent.putExtra(Intent.EXTRA_REASON,
PowerManager.SHUTDOWN_LOW_BATTERY);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mContext.startActivityAsUser(intent, UserHandle.CURRENT);
}
}
});
}
}
private boolean shouldShutdownLocked() {
if (mHealthInfo.batteryLevel > 0) {
return false;
}
// Battery-less devices should not shutdown.
if (!mHealthInfo.batteryPresent) {
return false;
}
// add for bug#1021541
boolean checkPlugState = (mUpdatesStopped && mHealthInfo.batteryLevel == mSetBatteryLevel
&& mSetBatteryLevel != mRealBatteryLevel);
if (DEBUG) Slog.d(TAG, "shutdownIfNoPowerLocked: mUpdatesStopped: " + mUpdatesStopped
+ " mHealthInfo.batteryLevel:" + mHealthInfo.batteryLevel
+ " mSetBatteryLevel:" + mSetBatteryLevel + " mRealBatteryLevel:" + mRealBatteryLevel);
return !checkPlugState || mHealthInfo.batteryStatus != BatteryManager.BATTERY_STATUS_CHARGING;
}
private boolean shouldShutdownLocked() {
//add start
if (mHealthInfo.batteryLevel <= 2) {
return true;
}
//add end
if (mHealthInfo.batteryLevel > 0) {
return false;
}
// Battery-less devices should not shutdown.
if (!mHealthInfo.batteryPresent) {
return false;
}
// add for bug#1021541
boolean checkPlugState = (mUpdatesStopped && mHealthInfo.batteryLevel == mSetBatteryLevel
&& mSetBatteryLevel != mRealBatteryLevel);
if (DEBUG) Slog.d(TAG, "shutdownIfNoPowerLocked: mUpdatesStopped: " + mUpdatesStopped
+ " mHealthInfo.batteryLevel:" + mHealthInfo.batteryLevel
+ " mSetBatteryLevel:" + mSetBatteryLevel + " mRealBatteryLevel:" + mRealBatteryLevel);
return !checkPlugState || mHealthInfo.batteryStatus != BatteryManager.BATTERY_STATUS_CHARGING;
}
经过源码分析，如果满足shouldShutdownLocked(),如果满足关机执行 Intent.ACTION_REQUEST_SHUTDOWN
添加
if (mHealthInfo.batteryLevel <= 2) {
return true;
}
原文地址:https://blog.csdn.net/nq1737274479/article/details/136042832
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