Android : Noob-proof instructions for Facebook Like- Button

I have the following problem. I am trying to create a like button for my facebook page, but I got stuck. I followed the instructions but it's not working! I did nowhere see a value to set the coordinates of this button. Where is it? thanks

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import ch.OptiLab.visuscontroll.R;
import com.facebook.Request;
import com.facebook.Response;
import com.facebook.Session;
import com.facebook.SessionState;
import com.facebook.UiLifecycleHelper;
import com.facebook.widget.LikeView;


public class MainActivity extends Activity implements OnClickListener {

    private UiLifecycleHelper uiHelper;
    TextView textView;
    Button buttonende;
    Button tipps;
        Button btn1;
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

          textView = (TextView) findViewById(R.id.textView);
          tipps = (Button) findViewById(R.id.tipps);
            btn1 = (Button) findViewById(R.id.buttonSTART);
            buttonende = (Button) findViewById(R.id.buttonende);
            btn1.setOnClickListener(this);





            uiHelper = new UiLifecycleHelper(this, callback);

            LikeView likeView = (LikeView) findViewById(R.id.like_view);
            likeView.setObjectId("https://www.facebook.com/optilab.ch");

            protected void onActivityResult(int requestCode, int resultCode, Intent data) {
                super.onActivityResult(requestCode, resultCode, data);

                uiHelper.onActivityResult(requestCode, resultCode, data, null);