Android通过访问网页查看网页源码实例详解

Android通过访问网页查看网页源码

1.添加网络权限

<!--访问网络的权限-->
<uses-permission android:name="android.permission.INTERNET"/>

2.获取网络中网页的数据

/**
   * 获取网页HTML源代码
   * @param path 网页路径
   */
  public static String getHtml(String path) throws Exception {
    URL url=new URL(path);
    HttpURLConnection conn=(HttpURLConnection)url.openConnection();
    conn.setConnectTimeout(5000);
    conn.setRequestMethod("GET");
    if(conn.getResponseCode()==200){
      InputStream inStream=conn.getInputStream();
      byte[] data=read(inStream);
      String html=new String(data,"UTF-8");
      return html;
    }
    return null;
  } 

  /**
   * 读取流中的数据
   */
  public static byte[] read(InputStream inputStream) throws IOException {
    ByteArrayOutputStream outputStream=new ByteArrayOutputStream();
    byte[] b=new byte[1024];
    int len=0;
    while((len=inputStream.read(b))!=-1){
      outputStream.write(b);
    }
    inputStream.close();
    return outputStream.toByteArray();
  }

3.处理查看网页源码的控制

public class HtmlViewActivity extends Activity { 

  private EditText pathText;
  private TextView codeView;
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    pathText=(EditText) findViewById(R.id.pagepath);//网页路径
    codeView=(TextView)findViewById(R.id.codeView);//显示获得的源码
    Button button=(Button) findViewById(R.id.button);//查看按钮
    button.setOnClickListener(new ButtonClickListener());//按钮事件
  }
  /**
   * 查看按钮处理事件
   */
  private final class ButtonClickListener implements View.OnClickListener{
    @Override
    public void onClick(View v) {
      String path=pathText.getText().toString();
      try {
        String html=PageService.getHtml(path);
        codeView.setText(html);
      } catch (Exception e) {
        e.printStackTrace();
        Toast.makeText(getApplicationContext(), R.string.error, 1);
      }
    }
  }
}

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