//this is JOBListAdapter class
package com.example.hellotest.adapters;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.List;
import java.util.Locale;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import com.example.hellotest.R;
import com.example.hellotest.model.Job;
public class JobListAdapter extends BaseAdapter {
private LayoutInflater mInflater ;
private List<Job> mJobs;
private SimpleDateFormat mDateFormat;
private SimpleDateFormat mInputFormat;
private String mPosterPrefix;
public JobListAdapter(Context context) {
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mDateFormat = new SimpleDateFormat("dd MMMM yyyy", Locale.US);
mInputFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss", Locale.US);
mPosterPrefix = context.getString(R.string.job_posted_by);
}
public void setJobList(List<Job> jobs) {
mJobs = jobs;
}
@Override
public int getCount() {
if(null != mJobs) {
return mJobs.size();
}
return 0;
}
@Override
public Object getItem(int position) {
return mJobs.get(position);
}
@Override
public long getItemId(int position) {
return mJobs.get(position).getId();
}
//this is the method where I think that the problem is please somebody tell me.
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if(null == convertView) {
convertView = mInflater.inflate(R.layout.job_list_row, null);
holder = new ViewHolder();
holder.created = (TextView) convertView.findViewById(R.id.job_listing_date);
holder.location = (TextView) convertView.findViewById(R.id.job_listing_location);
holder.title = (TextView) convertView.findViewById(R.id.job_listing_title);
holder.experience = (TextView) convertView.findViewById(R.id.job_listing_experience);
holder.poster = (TextView) convertView.findViewById(R.id.job_listing_posted_by);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
updateRow(holder, mJobs.get(position));
return convertView;
}
private void updateRow(ViewHolder holder, Job job) {
holder.title.setText(job.getTitle());
int id = job.isPremium() ? R.drawable.icon_premium : 0;
holder.created.setText(getDate(job.getCreated()));
holder.created.setCompoundDrawablesWithIntrinsicBounds(0, 0, id, 0);
holder.experience.setText(job.getExperience());
holder.location.setText(job.getLocation());
holder.poster.setText(mPosterPrefix + job.getPoster());
}
private CharSequence getDate(String created) {
try {
return mDateFormat.format(mInputFormat.parse(created));
} catch (ParseException e) {
e.printStackTrace();
}
return created;
}
private static class ViewHolder {
TextView created;
TextView title;
TextView location;
TextView experience;
TextView poster;
}
}
// layout for fragmentjob_listing even I make the listview height to fill_parent as suggested when I googled the solution for the issue.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/job_listing_filter_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/job_listing_tab_bg"
android:gravity="center_vertical"
android:minHeight="48dp" >
<TextView
android:id="@+id/job_listing_experience"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@drawable/selector_job_listing_tab"
android:clickable="true"
android:gravity="center"
android:text="@string/job_listing_experience" />
<ImageView
android:id="@+id/space2"
android:layout_width="1dp"
android:layout_height="match_parent"
android:contentDescription="@string/app_name"
android:scaleType="fitXY"
android:src="@drawable/job_listing_horizontal_divider" />
<TextView
android:id="@+id/job_listing_location"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="@drawable/selector_job_listing_tab"
android:clickable="true"
android:gravity="center"
android:text="@string/job_listing_location" />
</LinearLayout>
<ImageView
android:id="@+id/imageView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:contentDescription="@string/app_name"
android:scaleType="fitXY"
android:src="@drawable/job_listing_divider" />
<TextView
android:id="@+id/job_listing_message"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:gravity="center"
android:visibility="gone"/>
<ListView
android:id="@+id/job_list"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
</ListView>
</LinearLayout>
// JobListingFragment Class where the joblistAdapter class called up
package com.example.hellotest;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.Request.Method;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.Response.ErrorListener;
import com.android.volley.Response.Listener;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.Volley;
import com.example.hellotest.R;
import com.example.hellotest.adapters.JobListAdapter;
import com.example.hellotest.config.Constant;
import com.example.hellotest.io.CookieStringRequest;
import com.example.hellotest.io.json.JobsProcessor;
import com.example.hellotest.model.Job;
import com.example.hellotest.model.JobList;
import com.example.hellotest.model.Pagination;
import com.example.hellotest.tasks.JsonParserTask;
import com.example.hellotest.tasks.JsonParsingListener;
import com.example.hellotest.util.AccountUtils;
import com.example.hellotest.util.Log;
public class JobListingFragment extends Fragment {
public static final String ARG_URL = "argument_url";
public static final String ARG_IS_FILTER_ON = "argument_is_filtered";
public static final String ARG_IS_DEFAULT_JOB_LIST = "argument_is_default_job_list";
public static final String ARG_EMPTY_MESSAGE = "argument_empty_message";
protected static final int REQUEST_EXPERIENCE = 0x11;
protected static final int REQUEST_LOCATION = 0x12;
private ListView mJobsList;
private TextView mMessageView;
private JobListAdapter mAdapter;
private List<Job> mJobs;
private Pagination mPagination;
private boolean mIsFetching;
private boolean mIsDefaultList;
private boolean mIsFilterOn;
private String mUrl;
private String mLocId;
private int mExperienceId = -1;
private ProgressBar mFooterProgress;
private Log mLogger = new Log(JobListingFragment.class);
private Object mRequestTag = new Object();
private RequestQueue mRequestQueue;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mAdapter = new JobListAdapter(getActivity());
if (null != savedInstanceState) {
getState(savedInstanceState);
} else {
getState(getArguments());
}
// init();
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
mRequestQueue = Volley.newRequestQueue(getActivity());
}
@Override
public void onDetach() {
mRequestQueue.cancelAll(mRequestTag);
super.onDetach();
}
@Override
public void onResume() {
init();
super.onResume();
}
private void getState(Bundle bundle) {
mUrl = bundle.getString(ARG_URL);
mIsFilterOn = bundle.getBoolean(ARG_IS_FILTER_ON);
mIsDefaultList = bundle.getBoolean(ARG_IS_DEFAULT_JOB_LIST);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.fragment_job_listing, null);
mJobsList = (ListView) view.findViewById(R.id.job_list);
mMessageView = (TextView) view.findViewById(R.id.job_listing_message);
return view;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
View footer = getLayoutInflater(savedInstanceState).inflate(R.layout.paginated_list_footer, null);
mFooterProgress = (ProgressBar) footer.findViewById(R.id.footer_progress);
if (!mIsFilterOn) {
view.findViewById(R.id.job_listing_filter_container).setVisibility(View.GONE);
} else {
view.findViewById(R.id.job_listing_experience).setOnClickListener(mOnClickListener);
view.findViewById(R.id.job_listing_location).setOnClickListener(mOnClickListener);
}
mJobsList.addFooterView(footer);
mJobsList.setAdapter(mAdapter);
mJobsList.setOnScrollListener(mOnScrollListener);
mJobsList.setOnItemClickListener(mOnItemClickListener);
super.onViewCreated(view, savedInstanceState);
}
@Override
public void onSaveInstanceState(Bundle outState) {
outState.putString(ARG_URL, mUrl);
outState.putBoolean(ARG_IS_FILTER_ON, mIsFilterOn);
outState.putBoolean(ARG_IS_DEFAULT_JOB_LIST, mIsDefaultList);
super.onSaveInstanceState(outState);
}
public void startAfresh(String url, boolean isPaginated) {
mLogger.d("old fragment reused");
mIsFilterOn = true;
mUrl = url;
reset();
init();
}
private void init() {
mLocId = AccountUtils.getLocationFilter();
mExperienceId = AccountUtils.getExperienceFilter();
String url = getUrl(1);
fetchJobs(url);
}
private void reset() {
mJobs = null;
mPagination = null;
mAdapter.setJobList(null);
mAdapter.notifyDataSetChanged();
}
private String getUrl(int pageNumber) {
String appender = "";
if (mIsFilterOn) {
if (null != mLocId || -1 < mExperienceId) {
if (null != mLocId) {
appender += "/loc-" + mLocId;
} else {
appender += "/loc-" + 0;
}
if (-1 < mExperienceId) {
appender += "/exp-" + mExperienceId;
} else {
appender += "/exp-" + 0;
}
}
}
String url = mUrl + appender + "/pg-" + pageNumber;
if (mIsDefaultList && AccountUtils.isLoggedIn()) {
url += "?" + Constant.MAP_COOKIE_KEY + "=" + AccountUtils.getCookie();
}
return url;
}
private void fetchJobs(String url) {
mIsFetching = true;
mLogger.d("url :" + url);
int method = mIsDefaultList ? Method.GET : Method.POST;
CookieStringRequest request = new CookieStringRequest(method, url, mListener, mErrorListener);
request.setTag(mRequestTag);
mRequestQueue.add(request);
}
private Response.Listener<String> mListener = new Listener<String>() {
@Override
public void onResponse(String response) {
mLogger.d("response :" + response);
JsonParserTask<JobList> jsonTask = new JsonParserTask<JobList>(new JobsProcessor());
jsonTask.setListener(mJsonListener);
jsonTask.execute(response);
}
};
private Response.ErrorListener mErrorListener = new ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
mIsFetching = false;
Toast.makeText(getActivity(), R.string.network_error, Toast.LENGTH_LONG).show();
}
};
private JsonParsingListener<JobList> mJsonListener = new JsonParsingListener<JobList>() {
@Override
public void onSuccess(JobList result) {
if (null == mPagination) {
mPagination = result.getPagination();
mPagination.setCurrentPage(0);
if(null == result.getJobs() || 0 == result.getJobs().size()) {
mMessageView.setText(getArguments().getString(ARG_EMPTY_MESSAGE));
mMessageView.setVisibility(View.VISIBLE);
} else {
mMessageView.setVisibility(View.GONE);
}
} else {
mPagination.updateData(result.getPagination());
}
if (null != mJobs) {
mJobs.addAll(result.getJobs());
} else {
mJobs = result.getJobs();
}
mAdapter.setJobList(mJobs);
mAdapter.notifyDataSetChanged();
mIsFetching = false;
}
@Override
public void onFailure(Exception e) {
Toast.makeText(getActivity(), "Unable to process response", Toast.LENGTH_LONG).show();
mIsFetching = false;
}
};
private OnItemClickListener mOnItemClickListener = new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Job job = (Job) mAdapter.getItem(position);
Intent intent = new Intent(getActivity(), JobDetailsActivity.class);
intent.putExtra(JobDetailsActivity.EXTRA_JOB, job);
startActivity(intent);
}
};
//这是我发现可能会导致一些问题的功能，因为当我向下滚动列表中的项目时会重复。 private OnScrollListener mOnScrollListener = new OnScrollListener（）{
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
boolean loadMore = firstVisibleItem + visibleItemCount >= totalItemCount;
if (loadMore && totalItemCount > 0 && null != mPagination) {
boolean isLastPage = mPagination.getCurrentPage() >= mPagination.getTotalPages();
if (isLastPage) {
mFooterProgress.setVisibility(View.GONE);
}
if (!mIsFetching && !isLastPage) {
fetchJobs(getUrl(mPagination.getCurrentPage()+1));
}
}
}
};
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (Activity.RESULT_OK == resultCode) {
switch (requestCode) {
case REQUEST_EXPERIENCE:
onExperienceSelection(data);
break;
case REQUEST_LOCATION:
onLocationSelection(data);
break;
}
}
}
答案 0 :(得分：0)
在你的函数中添加一行：
mjob.clear();
private JsonParsingListener<JobList> mJsonListener = new JsonParsingListener<JobList>() {
@Override
public void onSuccess(JobList result) {
if (null == mPagination) {
mPagination = result.getPagination();
mPagination.setCurrentPage(0);
if(null == result.getJobs() || 0 == result.getJobs().size()) {
mMessageView.setText(getArguments().getString(ARG_EMPTY_MESSAGE));
mMessageView.setVisibility(View.VISIBLE);
} else {
mMessageView.setVisibility(View.GONE);
}
} else {
mPagination.updateData(result.getPagination());
}
if (null != mJobs) {
mJobs.clear();
mJobs.addAll(result.getJobs());
} else {
mJobs = result.getJobs();
}
mAdapter.setJobList(mJobs);
mAdapter.notifyDataSetChanged();
mIsFetching = false;
}