Specific methods:
Enter the RE manager into "System/build.prop", choose to open it with a text editor, and then add another line at the end: Qemu.hw.mainkeys=1. Then save the exit and restart the phone.
Precautions:
1. Before using this method, the cell phone must already be root.
2. Before modifying, make sure that you have installed and set up two software--GMD gesture control and Nova desktop software, otherwise you will not be able to return to the desktop.
This is to the whole hand gesture operation, is as long as you do not manually changed back, the use of the process will not see the virtual key. I use Gmd+nova desktop, of course you can choose other software instead.
How to restore hidden virtual keys: Use the RE manager to enter "System/build.prop", choose to open with a text editor, and then add a line at the end: Qemu.hw.mainkeys=1, here 1 is hidden, change it to 0, You can make the virtual key appear again.
The above is the Sony Z1 l39h virtual key completely hidden method, through the modification, you find the screen immediately become a lot of it?