无操作15分钟后自动调到最低亮度_安卓无操作后自动调到最低亮度-优快云博客

本文链接：https://blog.youkuaiyun.com/baiyifei2016/article/details/129794652

这篇博客详细解析了Android系统中PowerManagerService.java文件的修改，介绍了如何在无操作15分钟后自动调整屏幕亮度到最低。涉及到的关键代码包括使用Timer和TimerTask实现定时任务，以及SharedPreferences读取用户配置。此外，还探讨了与电池状态、用户活动超时和屏幕熄灭相关的处理逻辑。

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diff --git a/frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java b/frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java
index 8a53c556f7…95c2162961 100755
— a/frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java
+++ b/frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java
@@ -102,7 +102,11 @@ import android.hardware.hdmi.*;
import android.os.ServiceManager;
import android.hardware.JawestCtrlManager;

+import java.util.Timer;
+import java.util.TimerTask;
+import android.content.SharedPreferences;
+import java.io.File;
+import java.lang.reflect.Method;
/**

The power manager service is responsible for coordinating power management
functions on the device.
@@ -112,7 +116,7 @@ public final class PowerManagerService extends SystemService
private static final String TAG = “PowerManagerService”;

private static final boolean DEBUG = false;

private static final boolean DEBUG_SPEW = DEBUG && true;

private static final boolean DEBUG_SPEW = false;

// Message: Sent when a user activity timeout occurs to update the power state.
private static final int MSG_USER_ACTIVITY_TIMEOUT = 1;
@@ -730,9 +734,52 @@ public final class PowerManagerService extends SystemService
updateSettingsLocked();
mDirty |= DIRTY_BATTERY_STATE;
updatePowerStateLocked();
```
  	initTimerTask();
```

  	      android.util.Log.v(TAG,"initTimerTask:");
   }

}