Continue the content of the previous article, write the FindFragment.java file. Based on the three functions in the previous article, you can basically show the hot content. Next, you can mainly deal with the event of find person and find article button
- Since we need to find people later, we need to create a bean file to store user information
- Create a java file under the com.example.bean package -- FindPeople.java
- Handle the setting and obtaining of user related properties
——The complete code of FindPeople.java file is as follows
package com.example.bean;
public class FindPeople {
String userName; //User nickname
String signature; //User signature
String userLogImage; //User head
String passWord; //User password
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getSignature() {
return signature;
}
public void setSignature(String signature) {
this.signature = signature;
}
public String getUserLogImage() {
return userLogImage;
}
public void setUserLogImage(String userLogImage) {
this.userLogImage = userLogImage;
}
public String getPassWord() { return passWord; }
public void setPassWord(String passWord) {
this.passWord = passWord;
}
}
2. Next, we will start to deal with the event of two buttons: find a person and find a document
- Add an event to the find text button to get the user's input when clicking
- Send the requested content to the background service, get the information of relevant users, parse the returned Json and save the data in the bean, then update the UI through the adapter
- Similarly, when you click the find person button, you can get the input content and request data from the background service. In this step, the adapter and Json data processing required are different from the above content processing, so you need to create another
- It should be noted that after each network request, the content in ListView needs to be cleared, the adapter needs to be reinitialized, and the query content needs to be updated to the page
- Handle the event of clearing the input box button. When you click clear, on the one hand, you should set the content in EditText to be empty, and at the same time, you should update the content of ListView to popular content
——After all, the processing logic is similar. For details, see FindTabFragment.java file. The complete code is as follows:
package com.example.discover; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.os.Handler; import android.os.StrictMode; import android.support.v4.app.Fragment; import android.support.v4.app.INotificationSideChannel; import android.util.DisplayMetrics; import android.util.Log; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.AbsListView; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.ListView; import android.widget.TableRow; import android.widget.TextView; import android.widget.Toast; import com.example.bean.FindInfo; import com.example.bean.FindPeople; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; import java.util.ArrayList; import java.util.List; public class FindTabFragment extends Fragment implements AbsListView.OnScrollListener{ Activity mActivity; //Store current activity String baseUrl = "http://10.0.2.2: 8080 / ishareservice / servlet / "; / / address of web server String imgBaseUrl = "http://10.0.2.2:8080/iShareService/images / "; / / image resources public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View findLayout = inflater.inflate(R.layout.find_tab_content, container, false); return findLayout; } private ListView listView; private EditText searchView; //Search content box private Button clearInfo; //Search button private Button seekPeople; //Search button private Button seekInfo; //Search button private TextView hintTv; //Prompt information private String keyWord; //Search box text private Boolean isHot = true; //Used to determine whether to load the hot text or find the content private int page = 1; //Requested page number private int visibleLastIndex = 0; //Last visual index private int visibleItemCount; // Total visible items in the current window private int dataSize = 28; //Number of data sets private FindTabFragment.PaginationAdapter adapter; //Store popular and search information private FindTabFragment.PeopleAdapter peopleAdapter; //Depositing investigators private Handler handler = new Handler(); //Return test information /*TextView testTxt;*/ /** Called when the activity is first created. */ @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); //Return test information /* testTxt = (TextView)getActivity().findViewById(R.id.test_discover_tab);*/ listView = (ListView)getActivity().findViewById(R.id.find_listView); /* listView.addFooterView(loadMoreView); //Set bottom view of list*/ initializeAdapter(); //Initialize, fill in hot listView.setAdapter(adapter); /*listView.setOnScrollListener(this);*/ //Input box searchView = (EditText)getActivity().findViewById(R.id.et_seek_search); //Find person, find text button, button to clear the content of text box seekPeople = (Button) getActivity().findViewById(R.id.find_search_by_name); seekInfo = (Button) getActivity().findViewById(R.id.find_search_by_keyWord); clearInfo = (Button) getActivity().findViewById(R.id.seek_bt_clear); //Prompt information hintTv = (TextView) getActivity().findViewById(R.id.seek_list_hint_info); seekPeople.setOnClickListener(new mClick()); seekInfo.setOnClickListener(new mClick()); clearInfo.setOnClickListener(new mClick()); } class mClick implements View.OnClickListener { public void onClick(View v) { keyWord = searchView.getText().toString(); if(keyWord == ""){ Toast.makeText(getActivity(), "Search content cannot be empty!", Toast.LENGTH_LONG).show(); return; } if (v == seekPeople) { //Click to find someone hintTv.setText("Query results:"); listView.setAdapter(null); //Empty the contents of the ListView control initSearchPeopleAdapter(); listView.setAdapter(peopleAdapter); //Insert query results into the page peopleAdapter.notifyDataSetChanged(); }else if(v == seekInfo){ //Click to find the article isHot = false; hintTv.setText("Query results:"); listView.setAdapter(null); initSearchInfoAdapter(); listView.setAdapter(adapter); adapter.notifyDataSetChanged(); }else if(v == clearInfo){ //Click Clear isHot = true; hintTv.setText("Everyone is watching:"); listView.setAdapter(null); initializeAdapter(); //Initialize, fill in hot listView.setAdapter(adapter); adapter.notifyDataSetChanged(); searchView.setText(""); } } } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { int itemsLastIndex = adapter.getCount()-1; //Index of the last entry in the dataset int lastIndex = itemsLastIndex + 1; if (scrollState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE && visibleLastIndex == lastIndex) { // If it is automatic loading, you can place the code for asynchronous data loading here } } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { this.visibleItemCount = visibleItemCount; visibleLastIndex = firstVisibleItem + visibleItemCount - 1; //Last visual index //If all record options equal the number of data sets, remove the bottom view of the list if(totalItemCount == dataSize+1){ Toast.makeText(getActivity(), "All data loaded!", Toast.LENGTH_LONG).show(); } } /** * Querying data in a database */ private JSONArray loadDataFromDataBase(String QueryInfoUrl){ //Toast.makeText(getActivity(), "save", Toast.LENGTH_SHORT).show(); StringBuilder stringBuilder = new StringBuilder(); BufferedReader buffer = null; HttpURLConnection connGET = null; try { URL url = new URL(QueryInfoUrl); connGET = (HttpURLConnection) url.openConnection(); connGET.setConnectTimeout(5000); connGET.setRequestMethod("GET"); if (connGET.getResponseCode() == 200) { buffer = new BufferedReader(new InputStreamReader(connGET.getInputStream())); for (String s = buffer.readLine(); s != null; s = buffer.readLine()) { stringBuilder.append(s); } //Return test information JSONArray jsonArray = new JSONArray(stringBuilder.toString()); /* testTxt.setText(baseUrl+"QueryDiscover?page="+page+"&count="+count);*/ //Get the data, analyze Json page = page+1; //Update request page after a successful request buffer.close(); return jsonArray; }else{ Toast.makeText(getActivity(),"Non 200", Toast.LENGTH_LONG).show(); } } catch (Exception e) { e.printStackTrace(); Toast.makeText(getActivity(), "get Submission err.." + e.toString(), Toast.LENGTH_LONG).show(); } return null; } //Initialize setting details to FindInfo bean public List<FindInfo> initSetDataToBean(String detail){ List<FindInfo> findInfo = new ArrayList<FindInfo>(); try { JSONArray detailJsonArray = new JSONArray(detail); for (int i = 0; i < detailJsonArray.length(); i++) { FindInfo items = new FindInfo(); JSONObject temp = (JSONObject) detailJsonArray.get(i); Integer infoId = temp.getInt("infoId"); //Content ID String infoTitle = temp.getString("infoTitle"); //Content headings String infoDescribe = temp.getString("infoDescribe"); //Content brief String infoDetail = temp.getString("infoDetail"); //Content details Integer type = temp.getInt("infoType"); //Type: 0 for diary, 1 for fun Integer support = temp.getInt("infoSupport"); //Praise points String infoAuthor = temp.getString("infoAuthor"); //author items.setInfoId(infoId); items.setInfoTitle(infoTitle); items.setInfoDescribe(infoDescribe); items.setInfoDetail(infoDetail); items.setType(type); items.setSupport(support); items.setInfoAuthor(infoAuthor); findInfo.add(items); } return findInfo; }catch (JSONException e){ Toast.makeText(getActivity(), "initSetDataToBean abnormal err.." + e.toString(), Toast.LENGTH_LONG).show(); return null; } } //Initialize setting details to FindInfo bean public List<FindPeople> initSetPeopleDataToBean(String detail){ List<FindPeople> findPeople = new ArrayList<FindPeople>(); try { JSONArray detailJsonArray = new JSONArray(detail); for (int i = 0; i < detailJsonArray.length(); i++) { FindPeople items = new FindPeople(); JSONObject temp = (JSONObject) detailJsonArray.get(i); String userName = temp.getString("userName"); //User nickname String signature = temp.getString("signature"); //User signature String userLogImage = temp.getString("userLogImage"); //User head items.setUserName(userName); items.setSignature(signature); items.setUserLogImage(userLogImage); findPeople.add(items); } return findPeople; }catch (JSONException e){ Toast.makeText(getActivity(), "initSetPeopleDataToBean abnormal err.." + e.toString(), Toast.LENGTH_LONG).show(); return null; } } /** * Initialize the adapter of ListView, that is, open the data displayed on the page */ private void initializeAdapter(){ // Set thread policy setVersion(); String QueryHotInfoUrl = baseUrl+"QueryHotInfo"; JSONArray jsonArray = loadDataFromDataBase(QueryHotInfoUrl); try { JSONObject totalObject = (JSONObject)jsonArray.get(0); dataSize = totalObject.getInt("totalRecord"); //Total number of records String detail= totalObject.getString("RecordDetail"); //details if(initSetDataToBean(detail)!=null) { adapter = new PaginationAdapter(initSetDataToBean(detail)); //Set details to bean } }catch (JSONException e){ Toast.makeText(getActivity(), "initializeAdapter abnormal err.." + e.toString(), Toast.LENGTH_LONG).show(); } } /** * Initialize the adapter of ListView to display the result of the lookup file */ private void initSearchInfoAdapter(){ // Set thread policy setVersion(); String QueryHotInfoUrl = baseUrl+"QueryInfoByKey?key="+keyWord; JSONArray jsonArray = loadDataFromDataBase(QueryHotInfoUrl); try { JSONObject totalObject = (JSONObject)jsonArray.get(0); dataSize = totalObject.getInt("totalRecord"); //Total number of records String detail= totalObject.getString("RecordDetail"); //details if(initSetDataToBean(detail)!=null) { adapter = new PaginationAdapter(initSetDataToBean(detail)); //Set details to bean } }catch (JSONException e){ Toast.makeText(getActivity(), "initializeAdapter abnormal err.." + e.toString(), Toast.LENGTH_LONG).show(); } } /** * Initialize the adapter of ListView to display the results of finder */ private void initSearchPeopleAdapter(){ // Set thread policy setVersion(); String QueryPeopleInfoUrl = baseUrl+"QueryPeopleInfoByKey?nameKey="+keyWord; JSONArray jsonArray = loadDataFromDataBase(QueryPeopleInfoUrl); try { JSONObject totalObject = (JSONObject)jsonArray.get(0); dataSize = totalObject.getInt("totalRecord"); //Total number of records String detail= totalObject.getString("RecordDetail"); //details if(initSetPeopleDataToBean(detail)!=null) { peopleAdapter = new PeopleAdapter(initSetPeopleDataToBean(detail)); //Set details to bean } }catch (JSONException e){ Toast.makeText(getActivity(), "initializeAdapter abnormal err.." + e.toString(), Toast.LENGTH_LONG).show(); } } //If the APP requests network operation in the main thread, it will throw an exception, so it needs to use the thread to operate the network request void setVersion() { StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder() .detectDiskReads() .detectDiskWrites() .detectNetwork() .penaltyLog() .build()); StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder() .detectLeakedSqlLiteObjects() //Probe SQLite database operation .penaltyLog() //Print logcat .penaltyDeath() .build()); } /** * Convert Int to String */ private String IntToString(Integer num){ try { String str = num.toString(); //How many pages return str; } catch (NumberFormatException e) { e.printStackTrace(); } return null; } /** * Set the card style according to the returned article type */ class PaginationAdapter extends BaseAdapter { List<FindInfo> newsItems; public PaginationAdapter(List<FindInfo> newsitems){ this.newsItems = newsitems; } @Override public int getCount() { return newsItems.size(); } @Override public Object getItem(int position) { return newsItems.get(position); } @Override public long getItemId(int position) { return position; } //Set the Item to each card here @Override public View getView(int position, View view, ViewGroup parent) { if(view == null){ view = getLayoutInflater().inflate(R.layout.activity_seek_list_item, null); } //Remove popular logo if(!isHot){ TextView textViewImgBc = (TextView) view.findViewById(R.id.seek_list_textView); textViewImgBc.setCompoundDrawables(null, null, null, null); } //Content headings TextView tvTitle = (TextView)view.findViewById(R.id.seek_list_textView); tvTitle.setText(newsItems.get(position).getInfoTitle()); //Content likes TextView tvSupport = (TextView)view.findViewById(R.id.seek_list_textView2); String num = IntToString(newsItems.get(position).getSupport()); tvSupport.setText(num); return view; } /** * Add data list item * @param infoItem */ public void addNewsItem(FindInfo infoItem){ newsItems.add(infoItem); } } /** * Get screen width * * @param context * @return */ public static int getScreenWidth(Context context) { WindowManager wm = (WindowManager) context .getSystemService(Context.WINDOW_SERVICE); DisplayMetrics outMetrics = new DisplayMetrics(); wm.getDefaultDisplay().getMetrics(outMetrics); return outMetrics.widthPixels; } /** * Set the card style according to the returned user */ class PeopleAdapter extends BaseAdapter { List<FindPeople> newsItems; public PeopleAdapter(List<FindPeople> newsitems){ this.newsItems = newsitems; } @Override public int getCount() { return newsItems.size(); } @Override public Object getItem(int position) { return newsItems.get(position); } @Override public long getItemId(int position) { return position; } //Set the Item to each card here @Override public View getView(int position, View view, ViewGroup parent) { if(view == null){ view = getLayoutInflater().inflate(R.layout.activity_seek_list_item, null); } //User nickname TextView tvTitle = (TextView)view.findViewById(R.id.seek_list_textView); tvTitle.setText(newsItems.get(position).getUserName()); //User signature TextView tvSupport = (TextView)view.findViewById(R.id.seek_list_textView2); tvSupport.setText(newsItems.get(position).getSignature()); //User head //Get pictures through Internet links String imgUrl = newsItems.get(position).getUserLogImage(); Bitmap one; ImageView userImg = (ImageView) view.findViewById(R.id.seek_list_imgView); /* //Set picture size adaption int screenWidth = getScreenWidth(getContext()); ViewGroup.LayoutParams lp = userImg.getLayoutParams(); lp.width = screenWidth; lp.height = ViewGroup.LayoutParams.WRAP_CONTENT; userImg.setLayoutParams(lp); userImg.setMaxWidth(screenWidth); userImg.setMaxHeight(screenWidth * 5); *//*Actually, it can be determined according to the demand. I test it here as 5 times of the maximum width*/ try { one= LoadImgByNet.getBitmap(imgBaseUrl+imgUrl); userImg.setImageBitmap(one); }catch(IOException e){ e.printStackTrace(); } /*TableRow userImg = (TableRow) view.findViewById(R.id.seek_list_tableRow);*/ TextView textViewImgBc = (TextView) view.findViewById(R.id.seek_list_textView); textViewImgBc.setCompoundDrawables(null, null, null, null); /* String imgUrl = newsItems.get(position).getUserLogImage(); Bitmap one; try { one= LoadImgByNet.getBitmap(imgBaseUrl+imgUrl); *//*userImg.setBackground(new BitmapDrawable(getResources(),one)); //Set the head image as a background*//* Drawable drawable = new BitmapDrawable(getResources(),one); // This step must be done, otherwise it will not be displayed drawable.setBounds(drawable.getMinimumWidth(), 0,0 , drawable.getMinimumHeight()); textViewImgBc.setCompoundDrawables(drawable, null, null, null); }catch(IOException e){ e.printStackTrace(); }*/ return view; } /** * Add data list item * @param infoItem */ public void addNewsItem(FindPeople infoItem){ newsItems.add(infoItem); } } }
——The search page is almost over here. As for the entry details, we will leave them later. Next, we will deal with the release page first