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

public class MainActivity extends Activity {    private EditText address;    private Button getbutton;    private TextView text;            @Override    protected void onCreate(Bundle savedInstanceState) {        //版本4.0后需加这个，不然就报错android.os.NetworkOnMainThreadException        StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()                .detectDiskReads().detectDiskWrites().detectNetwork()                .penaltyLog().build());        StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()                .detectLeakedSqlLiteObjects().detectLeakedClosableObjects()                .penaltyLog().penaltyDeath().build());        //        super.onCreate(savedInstanceState);        setContentView(R.layout.test);        //初始化        address = (EditText) findViewById(R.id.address);        getbutton = (Button) findViewById(R.id.getbutton);        text = (TextView) findViewById(R.id.text);                                    getbutton.setOnClickListener(new Button.OnClickListener() {                        @Override            public void onClick(View v) {                // TODO Auto-generated method stub                String url = address.getText().toString();                getPDAServerData(url);            }        });    }    public void getPDAServerData(String url) {        HttpClient client = new DefaultHttpClient();        HttpPost request;        try {                        request = new HttpPost(url);                        //调用HttpClient对象的execute(HttpUriRequest request)发送请求，返回一个HttpResponse            HttpResponse response = client.execute(request);                        //返回响应码为200            if (response.getStatusLine().getStatusCode() == 200) {                                //从响应中获取消息实体                HttpEntity entity = response.getEntity();                if (entity != null) {                    String out = EntityUtils.toString(entity);                    text.setText(out);                }            }                                } catch (ClientProtocolException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }}