android编程问题 求大神指教呀 代码没有提示错误 但无法在模拟器上运行

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.NumberPicker;
import android.widget.TextView;

public class Main extends Activity {
private Button but ;
private TextView showView ;
private NumberPicker mytp;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.activity_main);
this.but = (Button) super.findViewById(R.id.lucheng);
this.showView = (TextView) super.findViewById(R.id.xianshilucheng);
this.mytp = (NumberPicker) super.findViewById(R.id.numberPicker1);

this.but.setOnClickListener(new ShowListener());
}
private class ShowListener implements OnClickListener {

public void onClick(View v) {
int info = Main.this.mytp.getValue() ;// 取得输入的内容
Main.this.showView.setText("输入的内容是：" + info) ;// 更新文本显示组件内容
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}

}