Остановка анимации

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;
import android.graphics.drawable.AnimationDrawable;
import android.view.View.OnClickListener;
 
 
public class MainActivity extends Activity {
 
    public ImageView train;
    private Button start;
    private Button stop;
 
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
    }
    public void start(View v){
        train = (ImageView)findViewById(R.id.train);
        Animation anim = AnimationUtils.loadAnimation(this, R.anim.anim);
        final Button start = (Button) findViewById(R.id.button);
        train.startAnimation(anim);
 
    }
 
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
     
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }
 
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
       
        int id = item.getItemId();
 
  
        if (id == R.id.action_settings) {
            return true;
        }
 
        return super.onOptionsItemSelected(item);
    }
}

final Button stop = (Button)findViewById(R.id.bStop);
stop.setOnClickListener(new OnClickListener() {
@Override
public void onClick(final View v) {
train.clearAnimation();
}
});

train.animate().cancel();