Android development-network image acquisition

Android development-network image acquisition

Used for completing the settings! Obtain network images

Here is a brief introduction to my situation.

 

First, design the layout. Drag a few widgets and then click OK.

Start adding features in Acitivity

Take a picture of the link online: http://www.chzu.edu.cn/page/main1152/images/banner.jpg

Paste the main code:

 

private Bitmap getUrlImageMap() {URL imageUrl = null;Bitmap bitmap = null;try {imageUrl = new URL(url);HttpURLConnection conn = (HttpURLConnection) imageUrl.openConnection();conn.connect();InputStream is = conn.getInputStream();bitmap = BitmapFactory.decodeStream(is);is.close();} catch (Exception e) {e.printStackTrace();}return bitmap;}

The above is to get the bitmap value of the image through the HttpUrlConnection link, and then write a class that inherits the AsyncTask to load the image.

 

Pay attention to doInbackground () and onPostExecute (). The former processes time-consuming operations and the latter processes UI updates. Do not make a mistake in this regard.

 

class loadImage extends AsyncTask
 
  {Bitmap aBitmap;@Overrideprotected Void doInBackground(Void... params) {aBitmap = getUrlImageMap();return null;}@Overrideprotected void onPostExecute(Void result) {super.onPostExecute(result);imageView.setImageBitmap(aBitmap);}}
 

Run, the interface is as follows

 

The example is very simple. Pay attention to the acquisition of one piece and asynchronous loading and UI updates. Click here to download the DEMO.