最近項目需求裏需要在設置菜單的休眠模式裏添加一項永不休眠選擇項。針對MTK平臺的修改方式有如下幾步驟。(其他平臺和android原生系統的修改方式類似，只是android原生系統修改永不休眠需要通過設置較長的時間實現)
1.由於代碼不同，在Jelly Bean（android4.2）之前，如下
在alps\frameworks\base\packages\SettingsProvider\res\values\defaults.xml中設置def_screen_off_timeout為-1，即
-1
同時請註意，經由下面的操作，setting裏面休眠時間的Never菜單才會出來：
修改alps\packages\apps\Settings\res\values\arrays.xml:

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<!-- Display settings.  The delay in inactivity before the screen is turned off. These are shown ain a list dialog. -->
 
    <string-array name="screen_timeout_entries">
 
        <item>15 seconds</item>
 
        <item>30 seconds</item>
 
        <item>1 minute</item>
 
        <item>2 minutes</item>
 
        <item>10 minutes</item>
 
        <item>30 minutes</item>
 
        <item>never</item>
 
    </string-array>

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

修改對比語言value文件夾下的arrays.xml,修改screen_timeout_entries對應的翻譯。不用管那個msgid，只是google用來表示是他自己的資源而已，直接添加"不滅"即可，請知悉。
2,若是android4.2的code,請在前面的修改基礎上再修改下面的代碼：
PowerManagerService.java
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private void updateUserActivitySummaryLocked(long now, int dirty) {
 
.....

//change code here ==============
 
                      Slog.d(TAG,"mScreenOffTimeoutSetting ="+mScreenOffTimeoutSetting);
 
                      //if (mUserActivitySummary != 0 ) {
 
                if (mUserActivitySummary != 0 && mScreenOffTimeoutSetting > 0) {
 
//change code here  end ==============
 
                    Message msg = mHandler.obtainMessage(MSG_USER_ACTIVITY_TIMEOUT);
 
                    msg.setAsynchronous(true);
 
                    mHandler.sendMessageAtTime(msg, nextTimeout);
 
                }

3.最後對packages/apps/Settings/src/com/android/settings下的DisplaySettings.java文件進行修改，修改如下：

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private void updateTimeoutPreferenceDescription(long currentTimeout) {
String summary;
 
//code here
//if (currentTimeout < 0) {
            // Unsupported value
            //summary = "";
       // } else {
final CharSequence[] entries = preference.getEntries();
final CharSequence[] values = preference.getEntryValues();
//code end
 
....................................
 
if (entries.length != 0) {
 
//code here
 
if(best == 7){
            summary = "無操作 永不滅";
        }else{
            summary = preference.getContext().getString(
                        R.string.screen_timeout_summary, entries[best]);
Log.i("zfc","summary="+summary+",best="+best);
}
//code end
} else {
                summary = "";
            }

如何在settings裏的休眠模式裏添加永不休眠