Show gmpApiKey in MainActivity

Author: Goooler

sample-app/src/main/java/com/google/secrets_gradle_plugin/sample/MainActivity.kt

@@ -14,10 +14,31 @@
 
 package com.google.secrets_gradle_plugin.sample
 
+import android.os.Bundle
+import android.widget.LinearLayout
+import android.widget.TextView
 import androidx.appcompat.app.AppCompatActivity
+import com.google.secrets_plugin.sample.BuildConfig
 
 /**
  * Dummy activity. See build.gradle.kts for sample usage of the plugin.
  */
 class MainActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        val textView = TextView(this).apply {
+            @Suppress("SetTextI18n")
+            text = "GMP API Key: ${BuildConfig.gmpApiKey}"
+        }
+        val linearLayout = LinearLayout(this).apply {
+            layoutParams = LinearLayout.LayoutParams(
+                LinearLayout.LayoutParams.MATCH_PARENT,
+                LinearLayout.LayoutParams.MATCH_PARENT
+            )
+            addView(textView)
+        }
+        setContentView(linearLayout)
+    }
 }