复制对应代码进adb界面中确认
全部软件沉浸虚拟键： adb shell settings put global policy_control immersive.navigation=*
沉浸状态栏+虚拟键： adb shell settings put global policy_control immersive.full=*
沉浸虚拟键，但不沉浸桌面.设置.android.相机：adb shell settings put global policy_control immersive.navigation=apps,-com.google.android.apps.nexuslauncher,-com.android.settings,-android,-com.google.android.GoogleCamera（这个没有全部软件沉浸的亮屏延迟bug）
恢复官方默认： adb shell settings put global policy_control null
以上来自链接。
逐一试了之后，发现 只有 “adb shell settings put global policy_control immersive.navigation=*” 符合要求。
在源码中搜索 “policy_control”，发现
frameworks/base/core/java/android/provider/Settings.java:7036:
public static final String POLICY_CONTROL = "policy_control";
全名为 android.provider.Settings.Global.POLICY_CONTROL;
搜索了 "POLICY_CONTROL ",匹配到的有：
frameworks/base/core/java/android/provider/Settings.java:7036:
public static final String POLICY_CONTROL = "policy_control";
frameworks/base/policy/src/com/android/internal/policy/impl/PolicyControl.java:40:
这里说明了配置沉浸式模式的格式，代码中也有这个说明对应上的。
参考：Android7.0隐藏Immersive Mode提示
/**
* Runtime adjustments applied to the global window policy.
*
* This includes forcing immersive mode behavior for one or both system bars (based on a package
* list) and permanently disabling immersive mode confirmations for specific packages.
*
* Control by setting {@link Settings.Global.POLICY_CONTROL} to one or more name-value pairs.
* e.g.
* to force immersive mode everywhere:
* "immersive.full=*"
* to force transient status for all apps except a specific package:
* "immersive.status=apps,-com.package"
* to disable the immersive mode confirmations for specific packages:
* "immersive.preconfirms=com.package.one,com.package.two"
*
* Separate multiple name-value pairs with ':'
* e.g. "immersive.status=apps:immersive.preconfirms=*"
*/
frameworks/base/policy/src/com/android/internal/policy/impl/PolicyControl.java:119:
public static void reloadFromSetting(Context context) {
if (DEBUG) Slog.d(TAG,"reloadFromSetting()");
String value =null;
try {
value = Settings.Global.getStringForUser(context.getContentResolver(),
Settings.Global.POLICY_CONTROL,
UserHandle.USER_CURRENT);
Log.d(TAG,"reloadFromSetting: " + value);
if (sSettingValue !=null &&sSettingValue.equals(value)) {
return;
}
setFilters(value);
sSettingValue = value;
} catch (Throwable t) {
Slog.w(TAG,"Error loading policy control, value=" + value, t);
}
}
frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java:783:
class SettingsObserverextends ContentObserver{
SettingsObserver(Handler handler) {
super(handler);
}
void observe() {
// Observe all users' changes
ContentResolver resolver =mContext.getContentResolver();
//省略其他无关的
........
resolver.registerContentObserver(Settings.Global.getUriFor(
Settings.Global.POLICY_CONTROL),false,this,
UserHandle.USER_ALL);
// 省略其他无关的
.......
updateSettings();
}
//好多无关的代码就不贴了
贴了那么多，也没说到怎么改；参照注释说明：
<!-- Initial value for the Settings.Secure.IMMERSIVE_MODE_CONFIRMATIONS setting,
which is a comma separated list of packages that no longer need confirmation
for immersive mode.
Override to disable immersive mode confirmation for certain packages. -->
<string name="def_immersive_mode_confirmations" translatable="false"></string>
以为就是改这里，将配置修改为
<string name="def_immersive_mode_confirmations" translatable="false">immersive.navigation=*</string>
编译之后发现并没有效果，又重新看了上面的ADB 命令：
adb shell settings put global policy_control immersive.navigation=*
发现def_immersive_mode_confirmations 对应的值只是在设备初始化中被应用：
com.android.providers.settings.DatabaseHelper
{
loadStringSetting(stmt, Settings.Secure.IMMERSIVE_MODE_CONFIRMATIONS,
R.string.def_immersive_mode_confirmations);
}
而Settings.Secure.IMMERSIVE_MODE_CONFIRMATIONS = "immersive_mode_confirmations";
而我们要改的是 policy_control ，且有全局作用的，故应该在
com.android.providers.settings.DatabaseHelper#loadGlobalSettings(SQLiteDatabase db)中实现
private void loadGlobalSettings(SQLiteDatabase db) {
SQLiteStatement stmt =null;
try {
stmt = db.compileStatement("INSERT OR IGNORE INTO global(name,value)"
+" VALUES(?,?);");
……
// --- New global settings start here
if (mAdd) {
//2020/6/16 默认开启沉浸式，自动隐藏导航栏
loadStringSetting(stmt, Settings.Global.POLICY_CONTROL, R.string.def_policy_control);
}
} finally {
if (stmt !=null) stmt.close();
}
}
其中 def_policy_control 为新定义的String,如下
<string name="def_policy_control" translatable="false">immersive.navigation=*</string>
编译后开机 生效了。
对java代码的格式化很不好，还需要自己手动调整
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