效果图：
此程序主要的知识点是：SimpleAdapter本身是不支持网络图片的， 如果在Map.put（a，b）中 b为一个Bitmap，程序不会报红色字体，而是在控制台输出绿色的字体，如下
05-10 15:46:45.474: I/System.out(846): resolveUri failed on bad bitmap uri: android.graphics.Bitmap@43e40c08
<喎�”http://www.2cto.com/kf/ware/vc/” target=”_blank” class=”keylink”>vcD4KPHA+0qrP68q1z9bP1Mq+zfjC5828xqzG5Mq1uty88rWlo6zKudPDU2ltcGxlQWRhcHRlctbQtcS3vbeoc2ltcGxlQWRhcHRlci5zZXRWaWV3QmluZGVyo6ijqaGjPC9wPgo8cD48YnI+CjwvcD4KPHA+PHByZSBjbGFzcz0=”brush:java;”>simpleAdapter.setViewBinder(new ViewBinder() {
@Override
public boolean setViewValue(View view, Object data,
String textRepresentation) {
if (view instanceof ImageView && data instanceof Bitmap) {
ImageView iv = (ImageView) view;
iv.setImageBitmap((Bitmap) data);
return true;
}
return false;
}
});
new SimpleAdapter(MainActivity.this,getData(), R.layout.t, new String[] { “images” },new int[] { R.id.ImageVIew_main });
有三个参数view,data,textRepresentation，说说前两个参数，view 是你自定义布局（如上 R.layout.t）中所有的组件，程序会遍历一边布局中的组件，data是你传的
list<map< ,=””>>（如上getData()方法，返回一个list<map< ,=””>>），程序会遍历每一项数据。接下来用if（）语句筛选就可以了。
既然是网络图片，那就需要权限
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<uses-permission android:name="android.permission.INTERNET"></uses-permission> |
代码如下：
MainActivity.java
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public class MainActivity extends ActionBarActivity { ListView listView; List<map<string, ?="">> data; String str[] = { "", //自己添加图片网址 h t t p :// "", "", "" }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); listView = (ListView) findViewById(R.id.LV_main); SimpleAdapter simpleAdapter = new SimpleAdapter(MainActivity.this, getData(), R.layout.t, new String[] { "images" }, new int[] { R.id.ImageVIew_main }); simpleAdapter.setViewBinder(new ViewBinder() { @Override public boolean setViewValue(View view, Object data, String textRepresentation) { if (view instanceof ImageView && data instanceof Bitmap) { ImageView iv = (ImageView) view; iv.setImageBitmap((Bitmap) data); return true; } return false; } }); listView.setAdapter(simpleAdapter); } public List<map<string, ?="">> getData() { data = new ArrayList<map<string, ?="">>(); for (int i = 0; i < str.length; i++) { Map<string, object=""> map = new HashMap<string, object="">(); map.put("images", returnBitMap(str[i])); data.add(map); } return data; } public Bitmap returnBitMap(String url) { URL myFileUrl = null; Bitmap bitmap = null; try { myFileUrl = new URL(url); } catch (MalformedURLException e) { e.printStackTrace(); } try { HttpURLConnection conn = (HttpURLConnection) myFileUrl .openConnection(); conn.setDoInput(true); conn.connect(); InputStream is = conn.getInputStream(); bitmap = BitmapFactory.decodeStream(is); is.close(); } catch (IOException e) { e.printStackTrace(); } return bitmap; }}</string,></string,></map<string,></map<string,></map<string,> |
activity_main.xml
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<!--?xml version="1.0" encoding="utf-8"?--><linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"><listview android:id="@+id/LV_main" android:layout_width="fill_parent" android:layout_height="fill_parent"></listview> </linearlayout> |
自定义布局文件
t.xml
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<!--?xml version="1.0" encoding="utf-8"?--><linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <imageview android:id="@+id/ImageVIew_main" android:layout_width="80dp" android:layout_height="80dp"></imageview></linearlayout> |