在
DisplaySettings.java (packages\apps\settings\src\com\android\settings):
的
public boolean onPreferenceChange(Preference preference, Object objValue)
中
if (KEY_SCREEN_TIMEOUT.equals(key)) {
int value = Integer.parseInt((String) objValue);
try {
Settings.System.putInt(getContentResolver(), SCREEN_OFF_TIMEOUT, value);
} catch (NumberFormatException e) {
Log.e(TAG, "could not persist screen timeout setting", e);
}
}
中的Settings.System.putInt(getContentResolver(), SCREEN_OFF_TIMEOUT, value);将超时到数值保存，然后在
在这里会用观察器获取timeout到时间作为锁屏时间
PhoneWindowManager.java (frameworks\base\policy\src\com\android\internal\policy\impl):
中的
public void updateSettings()
// use screen off timeout setting as the timeout for the lockscreen
mLockScreenTimeout = Settings.System.getInt(resolver, Settings.System.SCREEN_OFF_TIMEOUT, 0);
取出
下面的
public void userActivity() {
synchronized (mScreenLockTimeout) {
if (mLockScreenTimerActive) {
// reset the timer
mHandler.removeCallbacks(mScreenLockTimeout);
mHandler.postDelayed(mScreenLockTimeout, mLockScreenTimeout);
}
}
}
设置生效。
2、
在DisplaySettings.java到onCreat方法中，通过
ListPreference screenTimeoutPreference = (ListPreference) findPreference(KEY_SCREEN_TIMEOUT);
screenTimeoutPreference.setValue(String.valueOf(Settings.System.getInt(
resolver, SCREEN_OFF_TIMEOUT, FALLBACK_SCREEN_TIMEOUT_VALUE)));
screenTimeoutPreference.setOnPreferenceChangeListener(this);
找到xml文件描述到timeout到显示字符串列表和每项列表到值。
在Display_settings.xml (packages\apps\settings\res\xml): 中
<ListPreference
android:key="screen_timeout"
android:title="@string/screen_timeout"
android:summary="@string/screen_timeout_summary"
android:persistent="false"
android:entries="@array/screen_timeout_entries"
android:entryValues="@array/screen_timeout_values" />
部分说明来各个部分引用到值，我们关心entries和entryValues。
Arrays.xml (packages\apps\settings\res\values-zh-rcn): <string-array name="screen_timeout_entries">
<!-- 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>Never turn off</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>
<!-- Do not translate. -->
<string-array name="screen_timeout_values" translatable="false">
<!-- Do not translate. 2 hours-->
<item>7200000</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>
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