AsyncTask简单获取网络图片的例子

//首先呢，添加网络权限

android.permission.INTERNET

//然后，布局View

img=(Image)findViewById(R.id.imageView1);

btn=(Button)findViewById(R.id.button1);

btn.setOnClickListener(new View.OnClickListener(){

public void onClick(View v){

String path=”网络图片路径”;

new DemoTask().execute(path);

}

});

//最后：创建一个类继承AsyncTask

public class DemoTask extends AsyncTask(String, Void, Bitmap){

//重写doInBackground来进行任务

protected Bitmap doInBackground(String… params){

HttpClient httpClient = new DefaultHtppClient();

HttpGet httpGet = new HttpGet(params[0]);

Bitmap bitmap=null;

try{

HttpResponse httpResponse = httpClient.execute(httpGet);

if(httpResponse.getStatusLine().getStatusCode==200){

//同样，在这里可以获取到很多东西

//例如输入流：inputStream=httpResponse.getEntity().getContent();

HttpEntity httpEntity = HttpResponse.getEntity();

byte [] data = EntityUtils.toByteArray(httpEntity);

bitmap=BitmapFactory.decodeByteArray(data, 0, data.length);

}

}catch(Exception e){

e.printStackTrace();

}

return bitmpa;

}

//重写onPostExecute来更新View

protected void onPostExecute(Bitmap bm){

super.onPostExecute(result);

img.setImageBitmap(bm);

}

}