【发布时间】：2016-11-01 15:08:53
【问题描述】：
在我的应用程序中，我有一个片段，它从远程服务器加载图像以使用AsynTask 设置FrameLayout 的背景，在onPostExeccute() 方法中，我尝试使用Picasso 渲染位图图像。但是当我的 Fragment 第一次启动时，FrameLayout 的背景中没有加载任何图像，但是当我刷新特定的 Fragment 时，我可以看到 Image 作为背景。
更新了 AsyncTask 中的代码段
private class AsyncDataClass extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
String responseBody = "";
HttpParams httpParameters = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(httpParameters, 5000);
HttpConnectionParams.setSoTimeout(httpParameters, 5000);
HttpClient httpClient = new DefaultHttpClient(httpParameters);
HttpPost httpPost = new HttpPost(params[0]);
String jsonResult = "";
try {
HttpResponse response = httpClient.execute(httpPost);
jsonResult = inputStreamToString(response.getEntity().getContent()).toString();
System.out.println("Returned Json object " + jsonResult.toString());
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return jsonResult;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(ctx);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
System.out.println("Resulted Value: " + result);
if(result.equals("") || result == null){
Toast.makeText(ctx, "Server connection failed", Toast.LENGTH_LONG).show();
}
int jsonResult = returnParsedJsonObject(result);
if(jsonResult == -1){
Toast.makeText(ctx, "Sorry No Places Found", Toast.LENGTH_LONG).show();
}
if(jsonResult == 1){
//Toast.makeText(ctx, "", Toast.LENGTH_LONG).show();
try {
JSONObject jsonObj = new JSONObject(result);
// Getting JSON Array node
places = jsonObj.getJSONArray("result");
// looping through All Contacts
for (int i = 0; i < places.length(); i++) {
JSONObject place = places.getJSONObject(i);
// String slot = c.getString(TAG_SLOT);
// serverReturn.add(slot);
UserPlaces placeFroServer = new UserPlaces();
placeFroServer.setId(place.getString(TAG_PID));
placeFroServer.setName(place.getString(TAG_PNAME));
placeFroServer.setDescription(place.getString(TAG_DESC));
placeFroServer.setImg(place.getString(TAG_IMG));
placeFroServer.setLat(place.getString(TAG_LAT));
placeFroServer.setLng(place.getString(TAG_LNG));
placesList.add(placeFroServer);
}
UserPlaces myPlace = placesList.get(counter);
pid=myPlace.getId();
lat = myPlace.getLat();
lng = myPlace.getLng();
Picasso.with(ctx).load(myPlace.getImg()).into(new Target() {
@Override
public void onPrepareLoad(Drawable arg0) {
// TODO Auto-generated method stub
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom arg1) {
// TODO Auto-generated method stub
Toast.makeText(ctx,"Loaded",Toast.LENGTH_LONG).show();
pImg.setBackgroundDrawable(new BitmapDrawable(ctx.getResources(), bitmap));
pImg.invalidate();
}
@Override
public void onBitmapFailed(Drawable arg0) {
// TODO Auto-generated method stub
Toast.makeText(ctx, "Failed Loading", Toast.LENGTH_SHORT).show();
}
});
pname.setText(myPlace.getName());
pdes.setText(myPlace.getDescription());
rl.setVisibility(View.VISIBLE);
counter++;
} catch (JSONException e) {
String ex = e.getMessage();
e.printStackTrace();
}
}
if (pDialog.isShowing())
pDialog.dismiss();
}
private StringBuilder inputStreamToString(InputStream is) {
String rLine = "";
StringBuilder answer = new StringBuilder();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
try {
while ((rLine = br.readLine()) != null) {
answer.append(rLine);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return answer;
}
}
【问题讨论】：
-
我推荐使用 Glide...同时验证图像的大小
标签： android android-fragments picasso