Android Doze 使用详解

和你一起终身学习，这里是程序员Android

经典好文推荐，通过阅读本文，您将收获以下知识点:

一、Doze 模式
二、空闲状态下，优化app耗电
三、Doze 模式下的限制措施
四、Doze 模式概要
五、Doze 模式涉及的类如下:
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

当设备处于非充电、灭屏状态下静止一段时间，设备将进入睡眠状态，进入Doze模式，延长电池使用时间。Doze模式下系统会定期恢复正常操作，异步执行app的一些同步数据等操作。比如很长时间不使用，系统会允许设备一天访问一次网络等。当设备处于充电状态下，系统将进入标准模式，app执行操作将不被限制。

二、空闲状态下，优化app耗电

在用户没有使用app的情况下，系统会使app处于idle 状态,
在空闲状态下，系统将会禁止app网络访问以及数据同步

三、Doze 模式下的限制措施

1.禁止网络访问
2.忽略Wake lock
3.忽略Alarms(setAlarmClock() 、AlarmManager.setAndAllowwhileIdle() 这两个方法除外)
4.忽略WIFI 扫描
5.同步作业调度程序将不被执行

四、Doze 模式概要

Doze模式概要

五、Doze 模式涉及的类如下:

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：手机设备处于激活活动状态

• INACTIVE：屏幕关闭进入非活动状态

• IDLE_PENDING：每隔30分钟让App进入等待空闲预备状态

• IDLE：空闲状态

• IDLE_MAINTENANCE：处理挂起任务

  Doze 模式状态

  对应的 Doze 模式状态如下：

  Doze模式状态图

  active---> inactive ---> idle_pending

  运动模式检测

  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 电池优化使用情况
  白名单是以xml形式存储(deviceidle.xml)
  查看白名单命令

  //主要存放app包名adb shell dumpsys deviceidle whitelist

  白名单代码保存部分代码如下

  /**     * Package names the system has white-listed to opt out of power save restrictions,     * except for device idle mode.     */    private final ArrayMap mPowerSaveWhitelistAppsExceptIdle = new ArrayMap();    /**     * Package names the system has white-listed to opt out of power save restrictions for     * all modes.     */    private final ArrayMap mPowerSaveWhitelistApps = new ArrayMap();    /**     * Package names the user has white-listed to opt out of power save restrictions.     */    private final ArrayMap 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 状态分析

  Doze模式下的信息，包括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 关闭，设置为true 开启DeviceIdleController.java
  private static final boolean DEBUG = false;

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