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私はMainActivityにアクションバーとリフレッシュボタンを含み、ActionbarとMainActivityに "Deal Listing"というフラグメントを追加します。listviewはURLを実行し、フラグメントの "Deal Listing"の一部とを更新します。 URLを実行して "Deal"フラグメントのListviewを更新します。fragment "Deal Listing"がMainActivityに追加されました。クリックしたときにDealFragmentのlistviewのコンテンツを更新したい場合や、 "deal"フラグメントがMainActivityに追加された場合"ディール" 断片listview refreshButon .How私はアンドロイドの別のアクティビティからAsynkTaskを呼び出す方法は？
はここDealListing断片のコードであることを行うのです： -
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", "[email protected]");
// 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();
}
}
}
}
今私はSwipeRefreshLayoutを使用しています。使い方は簡単です.http：//www.androidhive.info/2015/05/android-swipe-down-to-refresh-listview-tutorial/ –
別のアクティビティでAsyncTaskを使用するには、現在のクラスから 'class CDealDataSent'を取り出す必要があります。 –
画面が開いているときにurlを実行していますなぜ空白を表示してリフレッシュを使用しているのですか –