This guide will show you how to fix the Black Screen in the Pojav launcher.
First, you must open the Pojav launcher on your mobile and click on setting in the top right corner. Then you need to click on java twicks and tap on Runtime manager. You have to make sure that the internet is set to default.
After that, select the JVM launch agreement under the run time manager. If you have made any changes, you must delete this and click on Memory allocation. You need to set the slider on the right side.
If you still face the issue, you must click on the custom path while installing any version. After that, select Minecraft and then select the version which you are downloading. It will add all your game process and the packs you will apply to the game to this folder and solve your problem.