Android 8.1 Doze模式分析（三）释放WakeLock

最新推荐文章于 2023-11-09 15:26:03 发布

lz强

最新推荐文章于 2023-11-09 15:26:03 发布

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分类专栏： Android 省电管理

本文链接：https://blog.youkuaiyun.com/liu362732346/article/details/86577388

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在第一篇Android 8.1 Doze模式分析（一）我们知道，进入深度doze模式后调用PowerManagerService.java的setDeviceIdleMode()释放WakeLock，现在我们就开始分析释放WakeLock的流程

PowerManagerService.java-->setDeviceIdleMode()

        @Override
        public boolean setDeviceIdleMode(boolean enabled) {
            return setDeviceIdleModeInternal(enabled);
        }

PowerManagerService.java-->setDeviceIdleModeInternal()

    boolean setDeviceIdleModeInternal(boolean enabled) {
        synchronized (mLock) {
            if (mDeviceIdleMode == enabled) {
                return false;
            }
            mDeviceIdleMode = enabled;
            updateWakeLockDisabledStatesLocked();
        }
        if (enabled) {
            EventLogTags.writeDeviceIdleOnPhase("power");
        } else {
            EventLogTags.writeDeviceIdleOffPhase("power");
        }
        return true;
    }

PowerManagerService.java-->updateWakeLockDisabledStatesLocked()

    private void updateWakeLockDisabledStatesLocked() {
        boolean changed = false;
        final int numWakeLocks = mWakeLocks.size();
        for (int i = 0; i < numWakeLocks; i++) {
            final WakeLock wakeLock = mWakeLocks.get(i);
            if ((wakeLock.mFlags & PowerManager.WAKE_LOCK_LEVEL_MASK)
                    == PowerManager.PARTIAL_WAKE_LOCK) {
                if (setWakeLockDisabledStateLocked(wakeLock)) {
                    changed = true;
                    if (wakeLock.mDisabled) {
                        // This wake lock is no longer being respected.
                        notifyWakeLockReleasedLocked(wakeLock);
                    } else {
                        notifyWakeLockAcquiredLocked(wakeLock);
                    }
                }
            }
        }
        if (changed) {
            mDirty |= DIRTY_WAKE_LOCKS;
            updatePowerStateLocked();
        }
    }

到这里是不是很熟悉，和我们在 Android Sprd省电管理（六）app 待机休眠优化讲到的就是一样了