我刚刚安装了SDK和ADT Eclipse plugin。我想做的是一个简单的“Hello，World”计划。我正在使用2.2 (8) API。这是我的代码：

package com.example.hello;

import android.app.Activity;

import android.widget.TextView;

import android.os.Bundle;

public class HelloWorld extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

TextView txt = new TextView(this);

txt.setText("Hello, Android");

setContentView(txt);

}

}

我的Eclipse控制台：

[2010-09-02 13:27:32 - HelloWorld] ------------------------------

[2010-09-02 13:27:32 - HelloWorld] Android Launch!

[2010-09-02 13:27:32 - HelloWorld] adb is running normally.

[2010-09-02 13:27:32 - HelloWorld] Performing com.example.hello.HelloWorld activity launch

[2010-09-02 13:27:32 - HelloWorld] Automatic Target Mode: Preferred AVD 'Android' is not available. Launching new emulator.

[2010-09-02 13:27:32 - HelloWorld] Launching a new emulator with Virtual Device 'Android'

[2010-09-02 13:28:12 - HelloWorld] New emulator found: emulator-5554

[2010-09-02 13:28:12 - HelloWorld] Waiting for HOME ('android.process.acore') to be launched...

在我的模拟器(5554：Android)上，没有显示任何内容，只有一个空白的屏幕，带有很酷的“Android”印记。我从根本上缺少什么？