Android：简单联网获取网页代码

最新推荐文章于 2021-05-26 04:23:44 发布

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最新推荐文章于 2021-05-26 04:23:44 发布

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文章标签：移动开发

本文介绍了一个简单的Android应用示例，展示了如何通过网络请求获取服务器数据，并在界面上显示出来。示例中使用了HttpClient进行POST请求，并处理了主线程上的网络操作。

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设置权限，在AndroidManifest.xml加入

<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(); } } }

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