Add function CopyFileActivity::copyFile()

src/main/java/com/kdanmobile/reader/copyfile/CopyFileActivity.kt

@@ -72,4 +72,8 @@ abstract class CopyFileActivity : KdanBaseActivity() {
         overridePendingTransition(0, 0)
         finish()
     }
+
+    protected fun copyFile() {
+        viewModel.copyFile(applicationContext)
+    }
 }