AndroidQ settings never turn off the screen

AndroidQ increases the screen never timeout

Due to the lack of understanding of the source code in this book, it is impossible to accurately prescribe the right medicine, so I found three solutions and tried them one by one.

The first plan

1: First modify res/values/arrays.xml.
The file saved in this file is array resources, whichever scheme needs to be changed.
30 minutes
//Add the change option, which is the array option
Never seen on the page

1800000
//Add option 2147483647 to int maximum value
2147483647
2: Modify src/com/android/settings/display/TimeoutListPreference.java and

finally modify src/com/android/settings/display/TimeoutPreferenceController.java

The second method

1: packages/apps/Settings/res/values/arrays.xml
30 minutes
//The following is the new
Never

1800000 -1 //If compiling with -1 will report an error, look at another solution 2: Then modify the set sleep time in the Settings.java file

//putInt finally calls putIntForUser
public static boolean putInt(ContentResolver cr, String name, int value) { return putIntForUser(cr, name, value, cr.getUserId()); }

//PutIntForUser is modified and set according to the incoming name and value special value -1
/** @hide */
@UnsupportedAppUsage
public static boolean putIntForUser(ContentResolver cr, String name, int value,int userHandle) { ///ADD START if(name.equals(SCREEN_OFF_TIMEOUT)) { //-1 description is the never-sleep value we added in the settings if(value==-1) { // Log.d("Settings","change screen timeout for:”+Integer.toString(Integer.MAX_VALUE-1000)); return putStringForUser(cr, name, Integer.toString(Integer.MAX_VALUE-1000), userHandle); } } ///ADD END return putStringForUser(cr, name , Integer.toString(value), userHandle); }

Another option for Android8

1：packages/apps/Settings/res/values/arrays.xml

30 minutes

never

1800000

2147483647

2：packages/apps/Settings/src/com/android/settings/display/TimeoutPreferenceController.java

@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
try {
long value = Long.parseLong((String) newValue); //int修改成long
Settings.System.putLong(mContext.getContentResolver(), SCREEN_OFF_TIMEOUT, value);
updateTimeoutPreferenceDescription((TimeoutListPreference) preference, value);
} catch (NumberFormatException e) {
Log.e(TAG, “could not persist screen timeout setting”, e);
}
return true;
}
…
private void updateTimeoutPreferenceDescription(TimeoutListPreference preference,
long currentTimeout) {
final CharSequence[] entries = preference.getEntries();
final CharSequence[] values = preference.getEntryValues();
final String summary;
if (preference.isDisabledByAdmin()) {
summary = mContext.getString(com.android.settings.R.string.disabled_by_policy_title);
} else {
final CharSequence timeoutDescription = getTimeoutDescription(
currentTimeout, entries, values);
// add code start
//if( currentTimeoutjava.lang.Integer.MAX_VALUE){
// summary = entries[best].toString();
// }
if(currentTimeout2147483647){
summary=timeoutDescription.toString();
}else{ //add code
summary = timeoutDescription == null
? “”
: mContext.getString(R.string.screen_timeout_summary, timeoutDescription);
}//add code
}
preference.setSummary(summary);
}

Never turn off the screen according to the database setting

Ben Xiaobai has worked on the java backend for a short period of time during his internship. It is easier to understand and recognize the way of operating the database
1: frameworks/base/packages/SettingsProvider/res/values/defaults.xml

true

• 1800000

• 0
  -1
  false
  false

2：frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java
private int getScreenOffTimeoutLocked(int sleepTimeout) {
int timeout = mScreenOffTimeoutSetting;

•    if(timeout == 0){
  

•       //rk3288 7.1比较特殊，这是是timeout为0代表不灭屏，一般android此值为-1,具体为多少需要查看Setting的DisplaySettings.java源码，比如我的是