convert LicenseActivity to kotlin

app/src/main/java/com/simplemobiletools/camera/activities/LicenseActivity.java

@@ -1,31 +0,0 @@
-package com.simplemobiletools.camera.activities;
-
-import android.content.Intent;
-import android.net.Uri;
-import android.os.Bundle;
-
-import com.simplemobiletools.camera.R;
-
-import butterknife.ButterKnife;
-import butterknife.OnClick;
-
-public class LicenseActivity extends SimpleActivity {
-
-    @Override
-    protected void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        setContentView(R.layout.activity_license);
-        ButterKnife.bind(this);
-    }
-
-    @OnClick(R.id.license_butterknife_title)
-    public void butterKnifeClicked() {
-        openUrl(R.string.butterknife_url);
-    }
-
-    private void openUrl(int id) {
-        final String url = getResources().getString(id);
-        final Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
-        startActivity(browserIntent);
-    }
-}

app/src/main/kotlin/com/simplemobiletools/camera/activities/LicenseActivity.kt

@@ -0,0 +1,22 @@
+package com.simplemobiletools.camera.activities
+
+import android.content.Intent
+import android.net.Uri
+import android.os.Bundle
+import com.simplemobiletools.camera.R
+import kotlinx.android.synthetic.main.activity_license.*
+
+class LicenseActivity : SimpleActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_license)
+        license_butterknife_title.setOnClickListener { openUrl(R.string.butterknife_url) }
+    }
+
+    private fun openUrl(id: Int) {
+        val url = resources.getString(id)
+        val browserIntent = Intent(Intent.ACTION_VIEW, Uri.parse(url))
+        startActivity(browserIntent)
+    }
+}