思路：1.获取json数据得到图片地址，图片简介文字存放在容器中
具体代码：
MainActivity :
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setTitle("用图片填充GridView");
GridView gridview = (GridView) findViewById(R.id.grid_view);
List<HashMap<String, String>> list = getimageList();
gridview.setAdapter(new GridViewAdapter(this, list));
}
// 从json中获取，图片地址、专辑名存放在list中
public List<HashMap<String, String>> getimageList() {
List<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();
String body;
try {
//Constants.URL
body = JsonUtil.getContent(Constants.URL);
JSONArray array = new JSONArray(body);
for (int i = 0; i < array.length(); i++) {
JSONObject jobj = array.getJSONObject(i);
HashMap<String, String> map = new HashMap<String, String>();
//“你的json地址”+json中取图片的相对地址得到绝对地址
map.put("itemImage",
Constants.ABSOLUTE_URL + jobj.getString("music_pic"));
map.put("itemText", jobj.getString("music_name"));
list.add(map);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return list;
}
}
GridViewAdapter：
public class GridViewAdapter extends BaseAdapter {
private List<HashMap<String, String>> list;
private Context context;
public GridViewAdapter(Context context, List<HashMap<String, String>> list) {
this.list = list;
this.context = context;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
MyView tag;
if (convertView == null) {
View v = LayoutInflater.from(context).inflate(
R.layout.gridview_list, null);
tag = new MyView();
tag.imageView = (ImageView) v.findViewById(R.id.grid_image);
tag.textView = (TextView) v.findViewById(R.id.grid_time);
v.setTag(tag);
convertView = v;
} else {
tag = (MyView) convertView.getTag();
}
String image_path = list.get(position).get("itemImage");
String text = list.get(position).get("itemText");
Bitmap bm = getBitMap(context, image_path);
if (bm == null) {
bm = BitmapFactory.decodeResource(context.getResources(),
R.drawable.error);
Log.i("BitmapPicture", "picture is null!!");
}
Bitmap newBit = Bitmap.createScaledBitmap(bm, 400, 300, true);
tag.imageView.setImageBitmap(newBit);
tag.textView.setText(text);
return convertView;
}
public synchronized Bitmap getBitMap(Context c, String url) {
URL myFileUrl = null;
Bitmap bitmap = null;
try {
myFileUrl = new URL(url);
} catch (MalformedURLException e) {
bitmap = BitmapFactory.decodeResource(c.getResources(),
R.drawable.error); // 当网络连接异常后,给个默认图片
return bitmap;
}
try {
// 打开网络连接
HttpURLConnection conn = (HttpURLConnection) myFileUrl
.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream(); // 把得到的内容转换成流
int length = (int) conn.getContentLength(); // 获取文件的长度
if (length != -1) {
byte[] imgData = new byte[length];
byte[] temp = new byte[512];
int readLen = 0;
int destPos = 0;
while ((readLen = is.read(temp)) > 0) {
System.arraycopy(temp, 0, imgData, destPos, readLen);
destPos += readLen;
}
bitmap = BitmapFactory.decodeByteArray(imgData, 0,
imgData.length);
}
} catch (IOException e) {
bitmap = BitmapFactory.decodeResource(c.getResources(),
R.drawable.error);
return bitmap;
}
return bitmap;
}
}
class MyView {
ImageView imageView;
TextView textView;
}
main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
<GridView
/>
</LinearLayout>
gridview_list.xml:
?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
</LinearLayout>