Android Question Change Brightness from a Service

ilan

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Longtime User
hi

i try to change the brightness from a Service but i get a NullPointerException.

this is the code:

B4X: 
phone1.SetScreenBrightness(0.1)

this is the log:

 
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JordiCP

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This has worked for me (brightness between 0 and 255). I run it from a service but tested it being called from Activity. I guess it should also work with the service standalone
B4X: 
'From https://stackoverflow.com/questions/6708692/changing-the-screen-brightness-system-setting-android?noredirect=1&lq=1
'needs permission WRITE_SETTINGS
Sub screenBrightness( brightnessInt As Int)     '0..255

   '    Original code
   '    android.provider.Settings.System.putInt(mContext.getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE, android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
   '   android.provider.Settings.System.putInt(mContext.getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS, brightnessInt);
   
   Dim J As JavaObject
   J.InitializeContext
   J.RunMethod("setBrightness",Array(J,brightnessInt))
End Sub

#if JAVA
import android.content.Context;
public void setBrightness(Context mContext, int brightnessInt){
   android.provider.Settings.System.putInt(mContext.getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE, android.provider.Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
   android.provider.Settings.System.putInt(mContext.getContentResolver(), android.provider.Settings.System.SCREEN_BRIGHTNESS, brightnessInt);
}
#End If

Needs AddPermission("android.permission.WRITE_SETTINGS") in manifest
 
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ilan

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thank you so much @JordiCP. you are awesome my friend !!
 
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P

pappicio

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Hi, is this code works also for oreo version?, I tryed but seems doesn't have effects on...
 
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