android 设置永不休眠

如果想第一次烧录系统开机就是永不休眠。这个需要修改def_screen_off_timeout = -1，在android 第一次开机的时候会去读取这个值，
在文件SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java

loadIntegerSetting(stmt, Settings.System.SCREEN_OFF_TIMEOUT,                    R.integer.def_screen_off_timeout);

中将def_screen_off_timeout 保存在数据库中SCREEN_OFF_TIMEOUT = def_screen_off_timeout，
当启动设置应用时，路径(package/apps/Settings)

@Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        ........         final long currentTimeout = getTimoutValue();         .......         updateTimeoutPreferenceDescription(currentTimeout);   private int getTimoutValue() {        int currentValue = Settings.System.getInt(getActivity()                .getContentResolver(), SCREEN_OFF_TIMEOUT,                FALLBACK_SCREEN_TIMEOUT_VALUE);        Xlog.d(TAG, "getTimoutValue()---currentValue=" + currentValue);        int bestMatch = 0;        int timeout = 0;        final CharSequence[] valuesTimeout = mScreenTimeoutPreference                .getEntryValues();        for (int i = 0; i < valuesTimeout.length; i++) {            timeout = Integer.parseInt(valuesTimeout[i].toString());            if (currentValue == timeout) {                return currentValue;            } else {                if (currentValue > timeout) {                    bestMatch = i;                }            }        }        Xlog.d(TAG, "getTimoutValue()---bestMatch=" + bestMatch);        return Integer.parseInt(valuesTimeout[bestMatch].toString()); }

读取数据中SCREEN_OFF_TIMEOUT 的值并更新到设置应用中。
在文件 PowerManagerService.java的函数 getScreenOffTimeoutLocked 修改前：

private int getScreenOffTimeoutLocked() {          int timeout = mScreenOffTimeoutSetting;          if (isMaximumScreenOffTimeoutFromDeviceAdminEnforcedLocked()) {              timeout = Math.min(timeout, mMaximumScreenOffTimeoutFromDeviceAdmin);          }          if (mUserActivityTimeoutOverrideFromWindowManager >= 0) {              timeout = (int)Math.min(timeout, mUserActivityTimeoutOverrideFromWindowManager);          }          return Math.max(timeout, MINIMUM_SCREEN_OFF_TIMEOUT);      }

修改后

 private int getScreenOffTimeoutLocked() {        int nosleep;          int timeout = mScreenOffTimeoutSetting;        if (isMaximumScreenOffTimeoutFromDeviceAdminEnforcedLocked()) {            timeout = Math.min(timeout, mMaximumScreenOffTimeoutFromDeviceAdmin);        }        if (mUserActivityTimeoutOverrideFromWindowManager >= 0) {            timeout = (int)Math.min(timeout, mUserActivityTimeoutOverrideFromWindowManager);        }        nosleep = mScreenOffTimeoutSetting;        if(nosleep  < 0) {            nosleep = mMaximumScreenOffTimeoutFromDeviceAdmin ;              return Math.max(nosleep, mMaximumScreenOffTimeoutFromDeviceAdmin);          }        return Math.max(timeout, MINIMUM_SCREEN_OFF_TIMEOUT);    }

这个函数会在设置时间有改动的时候被调用，
mMaximumScreenOffTimeoutFromDeviceAdmin 为系统支持最大不休眠的时间大概为2147483647 ，大概200小时。远远超过我们的电池电量的时间。
修改设置应用的代码 Settings/res/values/arrays.xml

 <string-array name="screen_timeout_entries">        <item>never</item>        <item>15 seconds</item>        <item>30 seconds</item>        <item>1 minute</item>        <item>2 minutes</item>        <item>5 minutes</item>        <item>10 minutes</item>        <item>30 minutes</item>    </string-array>

第一行添加 never

<string-array name="screen_timeout_values" translatable="false">        <item>-1</item>        <!-- Do not translate. -->        <item>15000</item>        <!-- Do not translate. -->        <item>30000</item>        <!-- Do not translate. -->        <item>60000</item>        <!-- Do not translate. -->        <item>120000</item>        <!-- Do not translate. -->        <item>300000</item>        <!-- Do not translate. -->        <item>600000</item>        <!-- Do not translate. -->        <item>1800000</item>    </string-array>

第一行添加 -1
res/values-zh-rCN/arrays.xml 中添加第一行

<string-array name="screen_timeout_entries">    <item msgid="6868686868686868688">"永不 休眠"</item>    <item msgid="3342301044271143016">"15 秒"</item>    <item msgid="8881760709354815449">"30 秒"</item>    <item msgid="7589406073232279088">"1 分钟"</item>    <item msgid="7001195990902244174">"2 分钟"</item>    <item msgid="7489864775127957179">"5 分钟"</item>    <item msgid="2314124409517439288">"10 分钟"</item>    <item msgid="6864027152847611413">"30 分钟"</item>  </string-array>

在函数 updateTimeoutPreferenceDescription 中修改

 if (currentTimeout < 0) {            // Unsupported value            summary = "";        }

改为

 if (currentTimeout < -1)

在下面代码中添加

 if (entries.length != 0) {                summary = preference.getContext().getString(                        R.string.screen_timeout_summary, entries[best]);                        //add  new code                if(currentTimeout < 0)                 summary =entries[best].toString();                //end  new code            } else {

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