如何以实用的方式在Android中为应用程序创建叠加层作为水印？

Question

I want to make an app in which there will be a watermark that will be shown in every activity including the fragments if it exists. I want to do that programmatically, without any XML for reducing redundant and boilerplate code. The main purpose of it is that if I share an APK with anyone else then he cannot steal my APK because it contains a weird watermark everywhere.

Answer 1

I made a library for this to do that in a reusable way. Here is documentation on how to use it in Java and Kotlin . First, initialize it from an activity from where you want to show the watermark-

AppWaterMarkBuilder.doConfigure()
                .setAppCompatActivity(MainActivity.this)
                .setWatermarkProperty(R.layout.layout_water_mark)
                .showWatermarkAfterConfig();

Then you can hide and show it from anywhere in your app -

  /* For hiding the watermark without callback*/
  AppWaterMarkBuilder.hideWatermark() 

  /* For showing the watermark without callback*/
  AppWaterMarkBuilder.showWatermark() 

Answer 2

You need to create a canvas object then draw on top of that. Canvas would be of size of the screen and so you can then measure the size for watermark bitmap. Then render it as a background image in the activity.