尝试过hello world,但是当点击运行时,模拟器只显示一个带有Android徽标闪亮的黑屏.

package com.hyper.tuti;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class TutiActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // setContentView(R.layout.main);
        TextView tv = new TextView(this);
        tv.setText("Hello,Android");
        setContentView(tv);
    }
}

为什么我的模拟器不工作？