App not running in the android studio?

package com.example.shaswat.funfacts;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import android.view.View;

import android.widget.Button;
import android.widget.TextView;

import java.util.Random;

import static com.example.shaswat.funfacts.R.*;

public class FunFactsActivity extends AppCompatActivity {
   //Declare our View variables
    private TextView mFactTextView;
    private Button mShowFactButton;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(layout.activity_fun_facts);
        //Assign the views from the layout file to the corresponding variable
        mFactTextView = (TextView) findViewById(id.factTextView);
        mShowFactButton = (Button) findViewById(id.showFactButton);
        View.OnClickListener listener=new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // The button was clicked so update the fact
                String fact="ostriches run faster thean horses";
                mFactTextView.setText(fact);

            }
        };
        mShowFactButton.setOnClickListener(listener);
    }
}