android4.2 增添永不休眠选项

感谢原创：http://www.csdn123.com/html/exception/626/626185_626187_626186.htm

设置 > 显示 > 休眠a. packages/apps/Settings/res/values/arrays.xml    <string-array name="screen_timeout_entries">        <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>        <span style="color:#339966;"><item>Never </item></span>    </string-array><!-- AnsonCode 2012.7.4+ <item>Never </item>-->    <!-- 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>300000</item>        <!-- Do not translate. -->        <item>600000</item>        <!-- Do not translate. -->        <item>1800000</item>        <span style="color:#339966;"><item>-1</item></span>    </string-array><span style="color:#339966;"><!-- AnsonCode－1 的值在表示永不休眠。+ <item>-1</item>--></span>b. 在其它有定义<string-array name="screen_timeout_entries">的地方添加一行，用于显示不同语言文字的内容，这是为了解决在不同语言时，如果没有定义，会出现异常退出的情况。大概有50个arrays.xml文件需要修改。如：packages/apps/Settings/res/values-zh-rCN/arrays.xml中（此路径中绿色表示国家语言）  <string-array name="screen_timeout_entries">    <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>    <item msgid="6864027952847611413">"从不"</item>  </string-array>c.在作出以上修改后，主界面的显示会不正常，需要在代码中加以下处理：找到如下方法：packages/apps/Settings/src/com/android/settings/DisplaySettings.java private void updateTimeoutPreferenceDescription(long currentTimeout) {        ListPreference preference = mScreenTimeoutPreference;        String summary;        if (currentTimeout < -1) {        //if (currentTimeout < 0) { AnsonCode2012.7.4            // Unsupported value            summary = "";        } else {            final CharSequence[] entries = preference.getEntries();            final CharSequence[] values = preference.getEntryValues();            int best = 0;            for (int i = 0; i < values.length; i++) {                long timeout = Long.parseLong(values[i].toString());                if (currentTimeout == timeout) {                    best = i;                    break;////AnsonCode2012.7.4                }            }            summary = preference.getContext().getString(R.string.screen_timeout_summary,                    entries[best]);            if(currentTimeout < 0)summary = entries[best].toString();//AnsonCode2012.7.4        }        preference.setSummary(summary);    }//注意与原来代码的区别：//1） 修改 0 改为－1， 为保证，在界面中，显示的文字不为空。//2）将 >=改为 ==是作一个准确判断，找到所设定的值便返回，退出循环；//3）不加此句内容，在界面上会显示： 无操作 从不 后， 加了以后则显示： 从不//在4.2上稍微有些不同， 主要是修改了对时间值的判断。    private static final int DEFAULT_SCREEN_OFF_TIMEOUT = 15 * 1000;    private static final int MINIMUM_SCREEN_OFF_TIMEOUT = 10 * 1000;    private int <span style="color:#339966;">getScreenOffTimeoutLocked</span>() {        int timeout = mScreenOffTimeoutSetting;        if (isMaximumScreenOffTimeoutFromDeviceAdminEnforcedLocked()) {            timeout = Math.min(timeout, mMaximumScreenOffTimeoutFromDeviceAdmin);        }        if (mUserActivityTimeoutOverrideFromWindowManager >= 0) {            timeout = (int)Math.min(timeout, mUserActivityTimeoutOverrideFromWindowManager);        }        <span style="color:#339966;">return Math.max(timeout, MINIMUM_SCREEN_OFF_TIMEOUT);</span>    } /**     * Updates the value of mUserActivitySummary to summarize the user requested     * state of the system such as whether the screen should be bright or dim.     * Note that user activity is ignored when the system is asleep.     *     * This function must have no other side-effects.     */    private void updateUserActivitySummaryLocked(long now, int dirty) {        // Update the status of the user activity timeout timer.        if ((dirty & (DIRTY_USER_ACTIVITY | DIRTY_WAKEFULNESS | DIRTY_SETTINGS)) != 0) {            mHandler.removeMessages(MSG_USER_ACTIVITY_TIMEOUT);            long nextTimeout = 0;            if (mWakefulness != WAKEFULNESS_ASLEEP) {                final int screenOffTimeout = <span style="color:#339966;">getScreenOffTimeoutLocked</span>();                final int screenDimDuration = getScreenDimDurationLocked(screenOffTimeout);                mUserActivitySummary = 0;                if (mLastUserActivityTime >= mLastWakeTime) {                    nextTimeout = mLastUserActivityTime                            + screenOffTimeout - screenDimDuration;                    if (now < nextTimeout) {                        mUserActivitySummary |= USER_ACTIVITY_SCREEN_BRIGHT;                    } else {                        nextTimeout = mLastUserActivityTime + screenOffTimeout;                        if (now < nextTimeout) {                            mUserActivitySummary |= USER_ACTIVITY_SCREEN_DIM;                        }                    }                }                if (mUserActivitySummary == 0                        && mLastUserActivityTimeNoChangeLights >= mLastWakeTime) {                    nextTimeout = mLastUserActivityTimeNoChangeLights + screenOffTimeout;                    if (now < nextTimeout                            && mDisplayPowerRequest.screenState                                    != DisplayPowerRequest.SCREEN_STATE_OFF) {                        mUserActivitySummary = mDisplayPowerRequest.screenState                                == DisplayPowerRequest.SCREEN_STATE_BRIGHT ?                                USER_ACTIVITY_SCREEN_BRIGHT : USER_ACTIVITY_SCREEN_DIM;                    }                }                if (mUserActivitySummary != 0) {                    Message msg = mHandler.obtainMessage(MSG_USER_ACTIVITY_TIMEOUT);                    msg.setAsynchronous(true);                    ///mHandler.sendMessageAtTime(msg, nextTimeout);if(mScreenOffTimeoutSetting > 0)mHandler.sendMessageAtTime(msg, nextTimeout);<span style="color:#339966;">//添加了一行判断, 如果值为-1则不发送广播</span>                }            } else {                mUserActivitySummary = 0;            }            if (DEBUG_SPEW) {                Slog.d(TAG, "updateUserActivitySummaryLocked: mWakefulness="                        + wakefulnessToString(mWakefulness)                        + ", mUserActivitySummary=0x" + Integer.toHexString(mUserActivitySummary)                        + ", nextTimeout=" + TimeUtils.formatUptime(nextTimeout));            }        }    }还需要改个地方：frameworks/base/services/java/com/android/server/power/PowerManagerService.javaprivate 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);                }

 最后，设置默认休眠时间值的路径：<strong>frameworks\base\packages\SettingsProvider\res\values\defaults.xml</strong>中设置def_screen_off_timeout的值就可以！