frameworks\base\core\res\res\values\config.xml
//默认打开
<bool name="config_dreamsEnabledByDefault">true</bool>
//允许任何时候都可进入屏保,
<bool name="config_dreamsEnabledOnBattery">true</bool>
//充电时是否默认打开屏保
<bool name="config_dreamsActivatedOnDockByDefault">false</bool>
//屏保应用
<!-- ComponentName of the default dream (Settings.Secure.DEFAULT_SCREENSAVER_COMPONENT) -->
<string name="config_dreamsDefaultComponent"translatable="false">com.google.android.deskclock/com.android.deskclock.Screensaver</string>
adb shell settings put system screen_off_timeout 2147483647 息屏休眠
adb shell settings get secure screensaver_components
com.android.deskclock/com.android.deskclock.Screensaver（时钟）
adb shell settings get secure screensaver_components
com.android.dreams.basic/com.android.dreams.basic.Colors （万花筒）
1，用户设置Settings.Secure.SCREENSAVER_COMPONENTS 的值
public static final String SCREENSAVER_COMPONENTS = "screensaver_components"
2，如果用户没有设置，则使用默认屏保，默认屏保的在default.xml中配置，配置config_dreamsDefaultComponent 值即可。
屏保启动过程：
\frameworks\base\services\core\java\com\android\server\dreams\DreamManagerService.java
private final class LocalService extends DreamManagerInternal {
@Override
public void startDream(boolean doze) {
startDreamInternal(doze);
}
private void startDreamInternal(boolean doze) {
final int userId = ActivityManager.getCurrentUser();
final ComponentName dream = chooseDreamForUser(doze, userId);//1.选择屏保页
if (dream != null) {
synchronized (mLock) {
startDreamLocked(dream, false /*isTest*/, doze, userId);//2.启动屏保
}
}
private ComponentName chooseDreamForUser(boolean doze, int userId) {
if (doze) {
ComponentName dozeComponent = getDozeComponent(userId);
return validateDream(dozeComponent) ? dozeComponent : null;
}
ComponentName[] dreams = getDreamComponentsForUser(userId);
return dreams != null && dreams.length != 0 ? dreams[0] : null;
private ComponentName[] getDreamComponentsForUser(int userId) {
//1.获取Settings.Secure.SCREENSAVER_COMPONENTS提供的屏保，如果这个值为null,
//2.走系统默认的getDefaultDreamComponentForUser
String names = Settings.Secure.getStringForUser(mContext.getContentResolver(),
Settings.Secure.SCREENSAVER_COMPONENTS,
userId);
ComponentName[] components = componentsFromString(names);
// first, ensure components point to valid services
List<ComponentName> validComponents = new ArrayList<ComponentName>();
if (components != null) {
for (ComponentName component : components) {
if (validateDream(component)) {
validComponents.add(component);
}
// fallback to the default dream component if necessary
if (validComponents.isEmpty()) {
//上面为null,这里获取默认的屏保
ComponentName defaultDream = getDefaultDreamComponentForUser(userId);
if (defaultDream != null) {
Slog.w(TAG, "Falling back to default dream " + defaultDream);
validComponents.add(defaultDream);
}
}
return validComponents.toArray(new ComponentName[validComponents.size()]);
}
//选择完了屏保，然后就是启动的流程，mController->DreamController
private void startDreamLocked(final ComponentName name,
final boolean isTest, final boolean canDoze, final int userId) {
.......
mHandler.post(wakeLock.wrap(
() -> mController.startDream(newToken, name, isTest, canDoze, userId, wakeLock)));
}
frameworks\base\services\core\java\com\android\server\dreams\DreamController.java
public void startDream(Binder token, ComponentName name,
boolean isTest, boolean canDoze, int userId, PowerManager.WakeLock wakeLock) {
stopDream(true /*immediate*/);
......
//最后通过bindServiceAsUser 启动之前找到的DreamService服务（屏保）
if (!mContext.bindServiceAsUser(intent, mCurrentDream,
Context.BIND_AUTO_CREATE | Context.BIND_FOREGROUND_SERVICE,
new UserHandle(userId))) {
......
ending --控制屏保在什么情况打开,显示（充电时，基座充电时或两者皆可）
frameworks\base\services\core\java\com\android\server\power\PowerManagerService.java
//是否打开屏保
mDreamsEnabledSetting = (Settings.Secure.getIntForUser(resolver,
Settings.Secure.SCREENSAVER_ENABLED,
mDreamsEnabledByDefaultConfig ? 1 : 0,
UserHandle.USER_CURRENT) != 0);
//仅充电时设置此值为1 public static final String SCREENSAVER_ACTIVATE_ON_DOCK = "screensaver_activate_on_dock";
mDreamsActivateOnSleepSetting = (Settings.Secure.getIntForUser(resolver,
Settings.Secure.SCREENSAVER_ACTIVATE_ON_SLEEP,
mDreamsActivatedOnSleepByDefaultConfig ? 1 : 0,
UserHandle.USER_CURRENT) != 0);
//基座充电时，此值为1 public static final String SCREENSAVER_ACTIVATE_ON_SLEEP = "screensaver_activate_on_sleep";
public static final String SCREENSAVER_ACTIVATE_ON_DOCK = "screensaver_activate_on_dock";
mDreamsActivateOnDockSetting = (Settings.Secure.getIntForUser(resolver,
Settings.Secure.SCREENSAVER_ACTIVATE_ON_DOCK,
mDreamsActivatedOnDockByDefaultConfig ? 1 : 0,
UserHandle.USER_CURRENT) != 0);
都为1,两者皆可，一个为1，为1的正确
都为true,两者皆可!!!
/frameworks/base/core/res/res/values/config.xml
<!-- If supported, are dreams enabled? (by default) -->
<bool name="config_dreamsEnabledByDefault">true</bool>
<!-- If supported and enabled, are dreams activated when docked? (by default) -->
<bool name="config_dreamsActivatedOnDockByDefault">true</bool>
<!-- If supported and enabled, are dreams activated when asleep and charging? (by default) -->
<bool name="config_dreamsActivatedOnSleepByDefault">true</bool>
Android ScreenSaver分析-CSDN博客
Android 10 如何自定义屏保功能-CSDN博客
Android P 屏保和休眠相关知识_android 屏保-CSDN博客
Android13 基座充电屏保-CSDN博客
