GameGuardian is a game hacking app that lets you modify the content of your Android video games to get advantages and improvements. It works based on code injection during the runtime to modify the parameters you want.
 
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Once GameGuardian is installed, you can leave the app running in the background with a semitransparent icon that you can see on the screen at all times. When you run a game, you can open GameGuardian game hacking app and select the process of the app you want to modify. For example, if you only have a certain number of lives in a game, you can use GameGuardian's hexadecimal editor to search for this number and replace it with any number you want.