<uses-permission android:name="android.permission.INTERNET"/>

public class MainActivity extends Activity {

    private TextView info=null;

    private Button Btn01=null;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        super.setContentView(R.layout.activity_main);

        this.info=(TextView)super.findViewById(R.id.info);

        this.Btn01=(Button)super.findViewById(R.id.Btn01);

        this.Btn01.setOnClickListener(new OnClickListenerImpl());

    }

    private class OnClickListenerImpl implements OnClickListener{

        @Override

        public void onClick(View v) {

            // TODO Auto-generated method stub

            System.out.println(">>Button");

            switch (v.getId()) {

            case R.id.Btn01:

                try {

                    System.out.println(">>btn01");

                    //URL url=new URL("http","172.17.8.28",80,"android.ashx");

                    URL url=new URL("http","t.sina.com",80,"/");

                    HttpURLConnection conn=(HttpURLConnection)url.openConnection();

                    byte data[]= new byte[512];

                    int len=conn.getInputStream().read(data);//输入流读取

                    System.out.println(">>len="+len);

                    if(len>0){

                        String temp= new String(data,0,len).trim();

                        //flag=Boolean.parseBoolean(temp); //取出里面的bool数据

                        System.out.println(">>"+temp);

                        MainActivity.this.info.setText(temp);

                    }

                    conn.getInputStream().close();

                } catch (Exception e) {

                    // TODO Auto-generated catch block

                    e.printStackTrace();

                    System.out.println("Error:"+e.toString());

                }

                break;

            default:

                break;

            }

        }

    }

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/LinearLayout1"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    tools:context=".MainActivity" >

    <Button

        android:id="@+id/Btn01"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="测试" />

    <TextView

        android:id="@+id/info"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content" />

</LinearLayout>