自定义imagegetter()的实现。

安卓软件开发--关于自定义imagegetter()的实现。

    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.net.HttpURLConnection;
    import java.net.URL;
     
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.graphics.drawable.Drawable;
    import android.text.Html;
    /*
    * @Author H3R3T1C
    * Email: th3h3r3t1c@gmail.com
    */
     
    public class CustomImageGetter implements Html.ImageGetter{
            // NOTE: The directories must already exist
            final static String CACHE_DIR = "/sdcard/DIC/image_cache/";
            @Override
            public Drawable getDrawable(String url) {
                    try{
                            // get name of image
                            String name = url.substring(url.lastIndexOf("/")+1);
                            // cache dir + name of image + the image save format
                            File f = new File(CACHE_DIR+name+".png");
                            if(!f.exists())// if it does not exist in the cache folder we need to download it
                                    downloadImage(url,f);
                            Drawable d = Drawable.createFromPath(f.getAbsolutePath());
                            d.setBounds(0, 0, 32, 32);// make it the size of the image
                            return d;
                    }catch(Exception e)
                    {
                            e.printStackTrace();
                    }
                    return null;
            }
            private void downloadImage(String url,File f) throws IOException
        {
                URL myFileUrl =new URL(url);   
                HttpURLConnection conn= (HttpURLConnection)myFileUrl.openConnection();
            conn.setDoInput(true);
            conn.connect();
            InputStream is = conn.getInputStream();
           
            Bitmap bm = BitmapFactory.decodeStream(is);
            FileOutputStream out = new FileOutputStream(f);   
            bm.compress(Bitmap.CompressFormat.PNG, 90, out);   
        }
    }