我正在尝试从 url 加载图像，在 Android 2.2 中加载了图像，但在 Android 4.0 ICS 中没有加载。背后的问题是什么？有没有其他方法可以做到这一点。
我的代码是
public class Photos extends Activity {
public static final String TAG_IMAGE_NAME = "image_name";
public static final String TAG_IMAGE_THUMB_NAME = "image_thumb_name";
public static String URL = "http://......./...../....../mainAPI.php";
ArrayList<HashMap<String, String>> photoList;
String responseData = null;
static GridView gridView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.photos);
gridView = (GridView)findViewById(R.id.gridView);
photoList = new ArrayList<HashMap<String,String>>();
new AsyncData().execute();
}
class AsyncData extends AsyncTask<String, Void, Void> {
ProgressDialog pDialog;
@Override
protected void onPreExecute() {
pDialog = new ProgressDialog(Photos.this);
pDialog.setTitle("Loading....");
pDialog.setMessage("Please wait...");
pDialog.show();
super.onPreExecute();
}
@Override
protected Void doInBackground(String... args) {
// TODO Auto-generated method stub
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(URL);
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("rquest","{\"method\":\"photogallery\",\"body\":[{}]}"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs, HTTP.UTF_8));
HttpResponse response = httpclient.execute(httppost);
HttpEntity resEntity = response.getEntity();
responseData = EntityUtils.toString(resEntity);
try {
JSONArray data = new JSONArray(responseData);
for (int i = 0; i < data.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
JSONObject c = data.getJSONObject(i);
String photoName = c.getString(TAG_IMAGE_NAME);
String imageThumbName = c.getString(TAG_IMAGE_THUMB_NAME);
map.put(TAG_IMAGE_NAME, photoName);
map.put(TAG_IMAGE_THUMB_NAME, imageThumbName);
photoList.add(map);
}
} catch (JSONException e) {
// TODO: handle exception
e.printStackTrace();
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(Void result) {
super.onPostExecute(result);
ImageAdapter adapter = new ImageAdapter(Photos.this, R.layout.photo_row, photoList);
gridView.setAdapter(adapter);
if (pDialog != null && pDialog.isShowing()) {
pDialog.dismiss();
}
}
}
图像适配器类。
public class ImageAdapter extends ArrayAdapter<HashMap<String, String>>{
Context context;
ArrayList<HashMap<String, String>> myList;
HashMap<String, String> myData;
int layout;
public ImageAdapter(Context context, int textViewResourceId, List<HashMap<String, String>> objects) {
super(context, textViewResourceId, objects);
// TODO Auto-generated constructor stub
this.context = context;
this.myList = (ArrayList<HashMap<String, String>>) objects;
this.layout = textViewResourceId;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
View row = null;
ImageView image = null;
Bitmap bimage;
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
row = inflater.inflate(layout, parent, false);
myData = myList.get(position);
try{
image = (ImageView)row.findViewById(R.id.imagePhoto);
String uri = ("" + myData.get(Photos.TAG_IMAGE_THUMB_NAME)).replace(" ", "%20");
System.out.println(uri);
bimage = getBitmapFromURL(uri);
image.setImageBitmap(bimage);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
return row;
}
public static Bitmap getBitmapFromURL(String src) {
try {
URL url = new URL(src);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
Bitmap myBitmap = BitmapFactory.decodeStream(input);
return myBitmap;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
}
请给我一些解决方案。