Android textviewクリックイベント

public class Main extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        TextView study_id = (TextView)findViewById(R.id.study_id); 
        study_id.setOnClickListener(
        new OnClickListener(){
			@Override
			public void onClick(View arg0) {
				Toast toast = Toast.makeText(getApplicationContext(), "I am Clicked", Toast.LENGTH_LONG);//      
				toast.show();
			}
        });
    }
}

    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >