android 基础 网络获取网页的源文件和图片

先打开数据连接,

public static byte[] getImage(String path) throws IOException {URL url = new URL("http://news.xinhuanet.com/mil/2012-09/11/123697757_11n.jpg");HttpURLConnection connection = (HttpURLConnection) url.openConnection();//获取数据连接connection.setRequestMethod("GET");//请求连接的方法connection.setConnectTimeout(5000);//请求超时InputStream inputStream = connection.getInputStream();// 获取请求连接返回的数据流byte[] data = StreamTool.readInputStream(inputStream);// 读取流数据,得到图片的二进制数据return data;}

读取流的方法

public static byte[] readInputStream(InputStream inputStream) throws IOException {ByteArrayOutputStream outputStream = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = 0;while ((len = inputStream.read(buffer)) != -1) {outputStream.write(buffer, 0, len);}inputStream.close();return outputStream.toByteArray();}

界面的控制

package com.itcast.net_img;import java.io.IOException;import com.itcast.service.ImageService;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.util.Log;import android.view.Menu;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import android.widget.Toast;/** * 涉及到网络图片 所以要加网络访问权限 *  * @author w *  */public class MainActivity extends Activity {private static final String TAG = "MainActivity";private EditText editText;private ImageView imageView;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);editText = (EditText) findViewById(R.id.imgPath);imageView = (ImageView) findViewById(R.id.imgView);Button button = (Button) findViewById(R.id.imgButton);button.setOnClickListener(new View.OnClickListener() {public void onClick(View v) {String imgpath = editText.toString();try {byte[] data = ImageService.getImage(imgpath);Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);// 生成位图imageView.setImageBitmap(bitmap);// 显示位图} catch (IOException e) {e.printStackTrace();Toast.makeText(MainActivity.this, R.string.error, Toast.LENGTH_SHORT).show();Log.i(TAG, e.toString());}}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.activity_main, menu);return true;}}

布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/img_label" />    <EditText        android:id="@+id/imgPath"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="http://news.xinhuanet.com/mil/2012-09/11/123697757_11n.jpg" />    <Button        android:id="@+id/imgButton"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/img_button" />    <ImageView        android:id="@+id/imgView"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></LinearLayout>

上面是显示图片,若果是返回网页的源码,让读取的二进制流转换成字符型,在声明个textview 把 把值设置进去就可以了