private static Bitmap getBitmapFromUrl(String urlString) { Bitmap bitmap; InputStream is = null; try { URL url = new URL(urlString); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); is = new BufferedInputStream(conn.getInputStream()); bitmap = BitmapFactory.decodeStream(is); conn.disconnect(); return bitmap; } catch (Exception e) { e.printStackTrace(); } finally { try { if (is != null) is.close(); } catch (IOException e) { } } return null; }
Drawable d = Drawable.createFromStream(is, "url");
package com.imooc.listviewacyncloader; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import java.util.List; public class MyAdapterNotUseCaches extends BaseAdapter { private LayoutInflater mInflater; private List<String> mData; public MyAdapterNotUseCaches(Context context, List<String> data) { this.mData = data; mInflater = LayoutInflater.from(context); } @Override public int getCount() { return mData.size(); } @Override public Object getItem(int position) { return mData.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { String url = mData.get(position); ViewHolder viewHolder = null; if (convertView == null) { viewHolder = new ViewHolder(); convertView = mInflater.inflate(R.layout.listview_item, null); viewHolder.imageView = (ImageView) convertView.findViewById(R.id.iv_lv_item); convertView.setTag(viewHolder); } else { viewHolder = (ViewHolder) convertView.getTag(); } viewHolder.imageView.setTag(url); viewHolder.imageView.setImageResource(R.drawable.ic_launcher); return convertView; } public class ViewHolder{ public ImageView imageView; } }
viewHolder.imageView.setTag(url);
public class Images { public final static String[] IMAGE_URLS = new String[] { "http://img.my.csdn.net/uploads/201407/26/1406383299_1976.jpg", "http://img.my.csdn.net/uploads/201407/26/1406383291_6518.jpg", "http://img.my.csdn.net/uploads/201407/26/1406383291_8239.jpg", "http://img.my.csdn.net/uploads/201407/26/1406383290_9329.jpg", "http://img.my.csdn.net/uploads/201407/26/1406383290_1042.jpg", "http://img.my.csdn.net/uploads/201407/26/1406383275_3977.jpg", "http://img.my.csdn.net/uploads/201407/26/1406383265_8550.jpg",……
package com.imooc.listviewacyncloader; import android.app.Activity; import android.os.Bundle; import android.widget.ListView; import java.util.Arrays; import java.util.List; public class MainActivity extends Activity { private ListView mListView; private List<String> mData; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mListView = (ListView) findViewById(R.id.lv); mData = Arrays.asList(Images.IMAGE_URLS); mListView.setAdapter(……); } }
原文地址:http://blog.csdn.net/eclipsexys/article/details/44416521