msm8909_Setting中添加永不休眠功能

项目中需要让Android板开机就进入桌面并且永不休眠。项目使用的是广和通的SC806Android开发板，msm8909平台。

配置永不休眠

diff

diff文件放前面，可以直接apply进去！

diff --git a/frameworks/base/packages/SettingsProvider/res/values/defaults.xml b/frameworks/base/packages/SettingsProvider/res/values/defaults.xml
index 64378d7ba7..3ee1079fb5 100644
--- a/frameworks/base/packages/SettingsProvider/res/values/defaults.xml
+++ b/frameworks/base/packages/SettingsProvider/res/values/defaults.xml
@@ -18,7 +18,8 @@
 -->
 <resources>
     <bool name="def_dim_screen">true</bool>
-    <integer name="def_screen_off_timeout">60000</integer>
+    <!-- <integer name="def_screen_off_timeout">60000</integer> -->
+    <integer name="def_screen_off_timeout">-1</integer>
     <integer name="def_sleep_timeout">-1</integer>
     <bool name="def_airplane_mode_on">false</bool>
     <bool name="def_theater_mode_on">false</bool>
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 7528a749b6..ff6ca47b87 100644
--- a/frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java
+++ b/frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java
@@ -1830,6 +1830,7 @@ public final class PowerManagerService extends SystemService
     }
 
     private int getScreenOffTimeoutLocked(int sleepTimeout) {
+        int nosleep;
         int timeout = mScreenOffTimeoutSetting;
         if (isMaximumScreenOffTimeoutFromDeviceAdminEnforcedLocked()) {
             timeout = Math.min(timeout, mMaximumScreenOffTimeoutFromDeviceAdmin);
@@ -1840,6 +1841,11 @@ public final class PowerManagerService extends SystemService
         if (sleepTimeout >= 0) {
             timeout = Math.min(timeout, sleepTimeout);
         }
+        nosleep = mScreenOffTimeoutSetting;
+        if(nosleep == 0) {
+            nosleep = mMaximumScreenOffTimeoutFromDeviceAdmin ;
+            return Math.max(nosleep, mMaximumScreenOffTimeoutFromDeviceAdmin);
+        }
         return Math.max(timeout, mMinimumScreenOffTimeoutConfig);
     }
 
diff --git a/packages/apps/Settings/res/values/arrays.xml b/packages/apps/Settings/res/values/arrays.xml
index c10057b423..f50595f501 100755
--- a/packages/apps/Settings/res/values/arrays.xml
+++ b/packages/apps/Settings/res/values/arrays.xml
@@ -46,6 +46,7 @@
 
     <!-- Display settings.  The delay in inactivity before the screen is turned off. These are shown in a list dialog. -->
     <string-array name="screen_timeout_entries">
+        <item>Never</item>
         <item>15 seconds</item>
         <item>30 seconds</item>
         <item>1 minute</item>
@@ -57,6 +58,8 @@
 
     <!-- Do not translate. -->
     <string-array name="screen_timeout_values" translatable="false">
+        <!-- Do not translate. -->
+        <item>0</item>
         <!-- Do not translate. -->
         <item>15000</item>
         <!-- Do not translate. -->

详细说明

Setting UI

首先修改setting -> display -> sleep 菜单数组，增加Never选项

文件路径：packages/apps/Settings/res/values/arrays.xml

新增如下两行：

        <item>Never</item>
-----------------------------------------------
		<!-- Do not translate. -->
        <item>0</item>

关闭息屏功能

文件路径：frameworks/base/packages/SettingsProvider/res/values/defaults.xml

修改def_screen_off_timeout 的值为 -1

    <!-- <integer name="def_screen_off_timeout">60000</integer> -->
    <integer name="def_screen_off_timeout">-1</integer>

更改电源管理方案

文件路径：frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java

在getScreenOffTimeoutLocked 方法中添加如下语句：

    private int getScreenOffTimeoutLocked(int sleepTimeout) {
        int nosleep;    // 新增
        int timeout = mScreenOffTimeoutSetting;
        if (isMaximumScreenOffTimeoutFromDeviceAdminEnforcedLocked()) {
            timeout = Math.min(timeout, mMaximumScreenOffTimeoutFromDeviceAdmin);
        }
        if (mUserActivityTimeoutOverrideFromWindowManager >= 0) {
            timeout = (int)Math.min(timeout, mUserActivityTimeoutOverrideFromWindowManager);
        }
        if (sleepTimeout >= 0) {
            timeout = Math.min(timeout, sleepTimeout);
        }
        // 新增判断开始
        nosleep = mScreenOffTimeoutSetting;
        if(nosleep == 0) {
            nosleep = mMaximumScreenOffTimeoutFromDeviceAdmin ;
            return Math.max(nosleep, mMaximumScreenOffTimeoutFromDeviceAdmin);
        }
        // 新增判断结束
        return Math.max(timeout, mMinimumScreenOffTimeoutConfig);
    }

    private int getScreenDimDurationLocked(int screenOffTimeout) {
        return Math.min(mMaximumScreenDimDurationConfig,
                (int)(screenOffTimeout * mMaximumScreenDimRatioConfig));
    }