Como ter a configuração de multi-janela no meu marshmallow Android no Samsung mobile quando o modo de desenvolvimento está em

Para habilitar o multi-window você deve editar o arquivo build.prop na pasta system no diretório raiz.

Se o seu telefone está enraizado então :

1.Navegue para system/build.prop usando qualquer explorador raiz (ex : ES File Explorer).

2. Depois abra o ficheiro build.prop em qualquer editor de texto.

3. Depois procure a linha ro.build.type.

4. Defina o seu valor para "userdebug" de "user".

5. Reboot.

6. Quando o dispositivo tiver inicializado, vá para as opções do desenvolvedor

7. Vá para o fundo da categoria "Drawing"

8. Habilite multi-window!

If your phone is not rooted then:

1.You should have adb downloaded on your pc.

2.Enable “usb debugging” on your phone and connect it to your pc using usb cable.

3.Boot your device into recovery

4.Mount your system by going to Mounts > Tick System

5.On your PC open a command line, inside the adb directory.

6. Type the following command:

1. adb pull /system/build.prop 

7. Open the build.prop file with your favourite (decent) editor, I recommend using Notepad++ on Windows

8. Find the "ro.build.type" line

9. Change the text after = to "userdebug" from "user"
BONUS: If you want a nicer DPI here, change the line "ro.sf.lcd_density" to your preferred DPI

10. Save the file

11. Go back to the command line and enter the following command:

1. adb push build.prop /system/ 

12. Now open a shell doing:

1. adb shell 

13. Now a adb shell will open, enter these commands:

1. cd system 
2. chmod 644 build.prop 

14.Disconnect usb. Then Reboot.

15. When the device has booted, go to the developer options

16. Scroll down to the bottom of the "Drawing" category

17. Enable multi-window!

P.S. - This will work for all Android devices ,not only Samsung!