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.java
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);
}
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！