和您一起一生学习，这里是程序员Android
本篇文章次要介绍 Android 开发中的局部知识点，通过浏览本篇文章，您将播种以下内容:
一、Doze 模式
二、闲暇状态下，优化app耗电
三、Doze 模式下的限度措施
四、Doze 模式概要
五、Doze 模式波及的类如下:
六、Doze 模式状态
七、Doze 白名单
八、Doze 模式测试方法
九、开启Doze dubug 调试开关
# 一、Doze 模式
当设施处于非充电、灭屏状态下静止一段时间，设施将进入睡眠状态，进入Doze模式，缩短电池应用工夫。Doze 模式下零碎会定期恢复正常操作，异步执行app的一些同步数据等操作。比方很长时间不应用，零碎会容许设施一天拜访一次网络等。当设施处于充电状态下，零碎将进入规范模式，app执行操作将不被限度。
二、闲暇状态下，优化app耗电
在用户没有应用app的状况下，零碎会使app处于idle 状态,
在闲暇状态下，零碎将会禁止app 网络拜访以及数据同步
三、Doze 模式下的限度措施
1.禁止网络拜访
2.疏忽Wake lock
3.疏忽Alarms(setAlarmClock() 、AlarmManager.setAndAllowwhileIdle() 这两个办法除外)
4.疏忽 WIFI 扫描
5.同步作业调度程序将不被执行
四、Doze 模式概要
五、Doze 模式波及的类如下:
frameworks/base/services/core/java/com/android/server/DeviceIdleController.java
/** * Keeps track of device idleness and drives low power mode based on that. */ public class DeviceIdleController extends SystemService implements AnyMotionDetector.DeviceIdleCallback {六、Doze 模式状态
- ACTIVE：手机设施处于激活活动状态
- INACTIVE：屏幕敞开进入非活动状态
- IDLE_PENDING：每隔30分钟让App进入期待闲暇准备状态
- IDLE：闲暇状态
- IDLE_MAINTENANCE：解决挂起工作
对应的 Doze 模式状态如下：
active---> inactive ---> idle_pending
静止模式检测
void handleMotionDetectedLocked(long timeout, String type) { // The device is not yet active, so we want to go back to the pending idle // state to wait again for no motion. Note that we only monitor for motion // after moving out of the inactive state, so no need to worry about that. boolean becomeInactive = false; if (mState != STATE_ACTIVE) { scheduleReportActiveLocked(type, Process.myUid()); mState = STATE_ACTIVE; mInactiveTimeout = timeout; mCurIdleBudget = 0; mMaintenanceStartTime = 0; EventLogTags.writeDeviceIdle(mState, type); addEvent(EVENT_NORMAL); becomeInactive = true; } if (mLightState == LIGHT_STATE_OVERRIDE) { // We went out of light idle mode because we had started deep idle mode... let's // now go back and reset things so we resume light idling if appropriate. mLightState = STATE_ACTIVE; EventLogTags.writeDeviceIdleLight(mLightState, type); becomeInactive = true; } if (becomeInactive) { becomeInactiveIfAppropriateLocked(); } }idle_pending ————>sensing
@Override public void onAnyMotionResult(int result) { if (DEBUG) Slog.d(TAG, "onAnyMotionResult(" + result + ")"); if (result != AnyMotionDetector.RESULT_UNKNOWN) { synchronized (this) { cancelSensingTimeoutAlarmLocked(); } } if (result == AnyMotionDetector.RESULT_MOVED) { if (DEBUG) Slog.d(TAG, "RESULT_MOVED received."); synchronized (this) { handleMotionDetectedLocked(mConstants.INACTIVE_TIMEOUT, "sense_motion"); } } else if (result == AnyMotionDetector.RESULT_STATIONARY) { if (DEBUG) Slog.d(TAG, "RESULT_STATIONARY received."); if (mState == STATE_SENSING) { // If we are currently sensing, it is time to move to locating. synchronized (this) { mNotMoving = true; stepIdleStateLocked("s:stationary"); } } else if (mState == STATE_LOCATING) { // If we are currently locating, note that we are not moving and step // if we have located the position. synchronized (this) { mNotMoving = true; if (mLocated) { stepIdleStateLocked("s:stationary"); } } } } }七、Doze 白名单
电量优化白名单
设置 --电池 --电量优化（menu菜单）
会设置查看app 电池优化应用状况
白名单是以xml模式存储(deviceidle.xml)
查看白名单命令
//次要寄存app包名adb shell dumpsys deviceidle whitelist白名单代码保留局部代码如下
/** * Package names the system has white-listed to opt out of power save restrictions, * except for device idle mode. */ private final ArrayMap<String, Integer> mPowerSaveWhitelistAppsExceptIdle = new ArrayMap<>(); /** * Package names the system has white-listed to opt out of power save restrictions for * all modes. */ private final ArrayMap<String, Integer> mPowerSaveWhitelistApps = new ArrayMap<>(); /** * Package names the user has white-listed to opt out of power save restrictions. */ private final ArrayMap<String, Integer> mPowerSaveWhitelistUserApps = new ArrayMap<>(); /** * App IDs of built-in system apps that have been white-listed except for idle modes. */ private final SparseBooleanArray mPowerSaveWhitelistSystemAppIdsExceptIdle = new SparseBooleanArray(); /** * App IDs of built-in system apps that have been white-listed. */ private final SparseBooleanArray mPowerSaveWhitelistSystemAppIds = new SparseBooleanArray(); /** * App IDs that have been white-listed to opt out of power save restrictions, except * for device idle modes. */ private final SparseBooleanArray mPowerSaveWhitelistExceptIdleAppIds = new SparseBooleanArray(); /** * Current app IDs that are in the complete power save white list, but shouldn't be * excluded from idle modes. This array can be shared with others because it will not be * modified once set. */ private int[] mPowerSaveWhitelistExceptIdleAppIdArray = new int[0]; /** * App IDs that have been white-listed to opt out of power save restrictions. */ private final SparseBooleanArray mPowerSaveWhitelistAllAppIds = new SparseBooleanArray(); /** * Current app IDs that are in the complete power save white list. This array can * be shared with others because it will not be modified once set. */ private int[] mPowerSaveWhitelistAllAppIdArray = new int[0]; /** * App IDs that have been white-listed by the user to opt out of power save restrictions. */ private final SparseBooleanArray mPowerSaveWhitelistUserAppIds = new SparseBooleanArray(); /** * Current app IDs that are in the user power save white list. This array can * be shared with others because it will not be modified once set. */ private int[] mPowerSaveWhitelistUserAppIdArray = new int[0];八、Doze 模式测试方法
1.开启Doze
`
adb shell dumpsys deviceidle enable`
`// or MTK addadb shell setprop persist.config.AutoPowerModes 1
`
2.拔掉电池
`
adb shell dumpsys battery unplug
`
3.调试Doze状态
Active ---idle_pending---sensing--location---idle --idle_mantenance
`
adb shell dumpsys deviceidle step
`
4.Dump Doze 状态剖析
Doze 模式下的信息，包含电池电量优化白名单等
`
adb shell dumpsys deviceidle
`
九、开启Doze dubug 调试开关
默认false 敞开，设置为true 开启DeviceIdleController.javaprivate static final boolean DEBUG = false;
情谊举荐：
Android 干货分享
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