http用于传输WWW方式的数据。http协议采用了请求响应的模型。在android中提供了HttpURLConnection和HttpClient接口开发HTTP程序。下面分别使用这两种方式获取网络图片。
1.HttpURLConnection
代码如下：
public class HttpURLConnectionActivity extends Activity {
private ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.simple1);
imageView=(ImageView) this.findViewById(R.id.imageView1);
//传入网络图片地址
try {
URL url = new URL("http://news.xinhuanet.com/photo/2012-02/09/122675973_51n.jpg");
HttpURLConnection conn= (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5*1000);
conn.connect();
InputStream in=conn.getInputStream();
ByteArrayOutputStream bos=new ByteArrayOutputStream();
byte[] buffer=new byte[1024];
int len = 0;
while((len=in.read(buffer))!=-1){
bos.write(buffer,0,len);
}
byte[] dataImage=bos.toByteArray();
bos.close();
in.close();
Bitmap bitmap=BitmapFactory.decodeByteArray(dataImage, 0, dataImage.length);
//Drawable drawable=BitmapDrawable.
imageView.setImageBitmap(bitmap);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
Toast.makeText(getApplicationContext(), "图片加载失败", 1).show();
}
}
}
最后不要忘记在manifest.xml加入网络访问权限：
<uses-permission android:name="android.permission.INTERNET" />
由于访问网络图片是比较耗时的操作，所以在正式项目中使用异步加载图片，效果会更好。
运行效果：
2.HttpClient
下面使用HttpClient获取网页内容：
public class HttpClientActivity extends Activity {
private ImageView imageview;
private TextView text;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.simple2);
imageview=(ImageView) this.findViewById(R.id.imageView2);
text=(TextView) this.findViewById(R.id.textView2);
HttpGet httpGet=new HttpGet("http://cloud.csdn.net/a/20120209/311628.html");
HttpClient httpClient=new DefaultHttpClient();
try {
//得到HttpResponse对象
HttpResponse httpResponse=httpClient.execute(httpGet);
//HttpResponse的返回结果是不是成功
if(httpResponse.getStatusLine().getStatusCode()==HttpStatus.SC_OK){
//得到返回数据的字符串
String dataImageStr=EntityUtils.toString(httpResponse.getEntity());
text.setText(dataImageStr);
}
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
运行效果：
这样就成功加载了网页内容。
原文地址：http://blog.csdn.net/wangkuifeng0118/article/details/7251065
