安卓异步处理 打开html代码

java代码

package com.example.ccc;


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;


import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.app.Activity;




public class MainActivity extends Activity {
private Button texte;
private TextView text;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
texte = (Button)findViewById(R.id.texte);
text = (TextView)findViewById(R.id.text);

texte.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
ReadURL("http://www.baidu.com");
}
});

}
public void ReadURL (String url)  {
new AsyncTask<String, Void, String>(){


@Override
protected String doInBackground(String... arg0) {
try {
URL url =new URL(arg0[0]);
 
try {
URLConnection conn = url.openConnection();
InputStream  is =conn.getInputStream();
        InputStreamReader isr= new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr); 
        String line;
        StringBuilder buli= new StringBuilder();
        
        while ((line=br.readLine()) !=null) {
buli.append(line);

}
        br.close();
        isr.close();
        is.close();
        return buli.toString();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
       
        
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
text.setText(result);
super.onPostExecute(result);
}

}.execute(url);

}
}

布局文件代码

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >


    <Button
        android:id="@+id/texte"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="读取数据 "/>


   <ScrollView
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:layout_alignLeft="@+id/texte"
       android:layout_below="@+id/texte" >


       <TextView
           android:id="@+id/text"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_marginTop="84dp"
           android:text="Large Text"
           android:textAppearance="?android:attr/textAppearanceLarge" />
   </ScrollView>


</RelativeLayout>

别忘了添加权限

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