我有一个MainActivity在操作栏中包含一个操作栏和一个刷新按钮，MainActivity添加了一个名为“Deal Listing”的片段，其中包含listview，它执行Url并更新了一些Listview片段“Deal Listing “和片段”交易“也执行URL并更新”交易“片段的Listview。当我想要将fragment”交易清单“添加到MainActivity时我想要刷新DealFragment列表视图的内容点击refreshButon，当“交易”片段添加到MainActivity时，我想刷新“Deal”片段listview refreshButon的内容。我该怎么做
以下是 DealListing Fragment 的代码： -
private void init() {
m_LoadMoreProgressView = (CircularProgressView) m_Main.findViewById(R.id.progressBar1);
m_LoadMoreProgressView.setVisibility(View.GONE);
m_n_FormImage = new int[]{
R.drawable.amazon,
R.drawable.whatsapp,
R.drawable.zorpia,
R.drawable.path,
R.drawable.app_me,
R.drawable.evernote,
R.drawable.app_me};
m_ListView = (ListView) m_Main.findViewById(R.id.dealList);
sz_RecordCount = String.valueOf(m_n_DefaultRecordCount);// increment of record count
sz_LastCount = String.valueOf(m_n_DeafalutLastCount);// increment of last count...
}
@SuppressWarnings("deprecation")
private String DealListing(String url) {
InputStream inputStream;
try {
// 1. create HttpClient
HttpClient httpclient = new DefaultHttpClient();
// 2. make POST request to the given URL
HttpPost httpPost = new HttpPost(url);
String json;
// 3. build jsonObject
JSONObject jsonObject = new JSONObject();
jsonObject.put("agentCode", m_szMobileNumber);
jsonObject.put("pin", m_szEncryptedPassword);
jsonObject.put("recordcount", sz_RecordCount);
jsonObject.put("lastcountvalue", sz_LastCount);
//jsonObject.put("emailId", "nirajk1190@gmail.com");
// 4. convert JSONObject to JSON to String
json = jsonObject.toString();
System.out.println("Jsons:-" + json);
// 5. set json to StringEntity
StringEntity se = new StringEntity(json);
// 6. set httpPost Entity
httpPost.setEntity(se);
// 7. Set some headers to inform server about the type of the content
httpPost.setHeader("Content-type", "application/json");
// 8. Execute POST request to the given URL
HttpResponse httpResponse = httpclient.execute(httpPost);
HttpEntity entity = httpResponse.getEntity();
// 9. receive response as inputStream
inputStream = entity.getContent();
System.out.println("InputStream....:" + inputStream.toString());
System.out.println("Response....:" + httpResponse.toString());
StatusLine statusLine = httpResponse.getStatusLine();
System.out.println("statusLine......:" + statusLine.toString());
////Log.d("resp_body", resp_body.toString());
int statusCode = statusLine.getStatusCode();
// 10. convert inputstream to string
if (statusCode == 200) {
// 10. convert inputstream to string
s_szresult = CJsonsResponse.convertInputStreamToString(inputStream);
//String resp_body =
} else
s_szresult = "Did not work!";
} catch (Exception e) {
Log.d("InputStream", e.getLocalizedMessage());
}
System.out.println("resul.....:" + s_szresult);
System.out.println("pin:" + m_szEncryptedPassword);
System.out.println("recordCount:" + sz_RecordCount);
System.out.println("LastCount:" + sz_LastCount);
// 11. return s_szResult
return s_szresult;
}
@SuppressWarnings("StatementWithEmptyBody")
private void getResponse() throws JSONException {// getting response from serevr ..................
if (m_oResponseobject.getString("resultdescription").equalsIgnoreCase("Transaction Successful")) {// server based condition
} else if (m_oResponseobject.getString("resultdescription").equalsIgnoreCase("Connection Not Available")) {//server based conditions
CSnackBar.getInstance().showSnackBarError(m_Main.findViewById(R.id.mainLayout), "Connection Lost !", getActivity());
} else if (m_oResponseobject.getString("resultdescription").equalsIgnoreCase("Deal List Not Found")) {// serevr based conditions .....
CSnackBar.getInstance().showSnackBarError(m_Main.findViewById(R.id.mainLayout), "No more deals available", getActivity());
}
}
// sending deal data to server and retreive response......
class CDealDataSent extends AsyncTask<String, Void, String> {
public CDealAppDatastorage item;
@Override
protected void onPreExecute() {
super.onPreExecute();
m_ProgressView.setVisibility(View.VISIBLE);
}
@Override
protected String doInBackground(String... urls) {
return DealListing(urls[0]);// sending data to server...
}
// onPostExecute displays the results of the AsyncTask.
@SuppressWarnings("deprecation")
@SuppressLint("SetTextI18n")
@Override
protected void onPostExecute(final String result) {
m_ProgressView.setVisibility(View.GONE);
try {
m_oResponseobject = new JSONObject(result);// getting response from server
JSONArray posts = m_oResponseobject.optJSONArray("dealList");
for (int i = 0; i < posts.length(); i++) {
JSONObject post = posts.getJSONObject(i);
item = new CDealAppDatastorage();
item.setM_szHeaderText(post.getString("dealname"));
item.setM_szsubHeaderText(post.getString("dealcode"));
item.setM_szDealValue(post.getString("dealvalue"));
item.setM_n_Image(m_n_FormImage[i]);
s_oDataset.add(item);
}
// LoadMore button
Button btnLoadMore = new Button(getActivity());
btnLoadMore.setText("LOAD MORE DEALS");
btnLoadMore.setBackgroundResource(R.drawable.button_boarder);
btnLoadMore.setTextAppearance(getActivity(), android.R.style.TextAppearance_DeviceDefault_Small);
btnLoadMore.setTextColor(Color.WHITE);
btnLoadMore.setGravity(Gravity.CENTER);
if (!s_oDataset.isEmpty()) {
// Adding Load More button to lisview at bottom
m_ListView.addFooterView(btnLoadMore);
m_oAdapter = new CDealAppListingAdapter(getActivity(), s_oDataset);// create adapter object and add arraylist to adapter
m_ListView.setAdapter(m_oAdapter);//adding adapter to recyclerview
m_oAdapter.notifyDataSetChanged();
} else {
btnLoadMore.setVisibility(View.GONE);
}
btnLoadMore.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
m_n_DefaultRecordCount = m_n_DefaultRecordCount + 5;// increment of record count by 5 on next load data
m_n_DeafalutLastCount = m_n_DeafalutLastCount + 5;// same here.....as above
sz_RecordCount = String.valueOf(m_n_DefaultRecordCount);// convert int value to string
sz_LastCount = String.valueOf(m_n_DeafalutLastCount);// convert int value to string /////
new DealNext().execute(m_DealListingURL);// POST DATA TO SERVER TO LOAD MORE DATA......
}
});
getResponse();
} catch (JSONException e) {
e.printStackTrace();
}
}
}
// sending data and receive reponse on second hit T LOAD MORE DATA when show more Btn clicked..............
private class DealNext extends AsyncTask<String, Void, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
m_LoadMoreProgressView.setVisibility(View.VISIBLE);// SHOW PROGRESS BAR
}
@Override
protected String doInBackground(String... urls) {
//My Background tasks are written here
synchronized (this) {
return DealListing(urls[0]);// POST DATA TO SERVER
}
}
@Override
protected void onPostExecute(final String result) {
super.onPostExecute(result);
m_LoadMoreProgressView.setVisibility(View.GONE);// DISMISS PROGRESS BAR..........
try {
m_oResponseobject = new JSONObject(result);// getting response from server
final JSONArray posts = m_oResponseobject.optJSONArray("dealList");// GETTING DEAL LIST
for (int i = 0; i < posts.length(); i++) {
JSONObject post = posts.getJSONObject(i);// GETTING DEAL AT POSITION AT I
item = new CDealAppDatastorage();// object create of DealAppdatastorage
item.setM_szHeaderText(post.getString("dealname"));//getting deal name
item.setM_szsubHeaderText(post.getString("dealcode"));// getting deal code
item.setM_szDealValue(post.getString("dealvalue"));
if(!s_oDataset.contains(item)){
s_oDataset.add(item);
}
}
// get listview current position - used to maintain scroll position
int currentPosition = m_ListView.getFirstVisiblePosition();
m_oAdapter = new CDealAppListingAdapter(getActivity(), s_oDataset);
m_ListView.setAdapter(m_oAdapter);
// Setting new scroll position
m_ListView.setSelectionFromTop(currentPosition + 1, 0);
getResponse();// getting response from server.....and also here response based logics...
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
答案 0 :(得分：1)
如果您能以某种方式将Activity类或其上下文传递给AsyncTask，它将解决您显示对话框的问题。您需要将另一个参数与要发送的URL一起包含在内，并将该参数放在Context变量中。然后，只要您需要对话框，就可以使用该上下文变量来显示它。
如果对话框没有可以显示它的上下文，它肯定会遇到运行时错误。