我正在通过 REST API 从作业站点检索数据。我能够检索数据，甚至可以在搜索按钮后的同一页面中显示该数据。但是，我想在新 Activity 中显示 ListView 。我正在使用 Intent 来做到这一点。但是，不幸的是，我无法证明这一点。一旦我点击它，我的应用程序就会崩溃并且不输出任何内容。
主要 Activity .java 公共(public)类 MainActivity 扩展 Activity {
//private String url1 = "http://api.openweathermap.org/data/2.5/weather?q=";
//private String url2 = "&mode=xml";
EditText queryText;
EditText locationText;
EditText sortText;
EditText fromAgeText;
ListView responseView;
// EditText radiusText;
ProgressBar progressBar;
EditText jtText;
EditText chnlText;
EditText countryText;
EditText txText;
static final String API_KEY = "298**70********4";
static final String API_URL = "http://api.xyz.com/abc/apisearch?";
ProgressDialog waitProgress;
EditText startText;
EditText limitRes;
EditText filterText;
EditText userIpText; //="122.171.57.131";
EditText radiusText;
EditText browserText;
EditText version;
EditText stText;
EditText latlongText;
//private HandleXML obj;
String finalUrl;
ArrayList<Result> rList = null;
ArrayList<Result> resultlist;
String tempResponse;
private PostBaseAdapter adapter;
ListView list;
Result result;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//initializeUI("java","bangalore","karnataka","date","25","jobsite","fulltime","0","15","14","1","1","india","null","122.172.176.113","chrome","2");
initializeUI();
}
//responseView = (ListView) findViewById(R.id.responseView);
private void initializeUI() {
queryText = (EditText) findViewById(R.id.queryText);
locationText = (EditText) findViewById(R.id.locationText);
txText = (EditText) findViewById(R.id.txText);
sortText = (EditText) findViewById(R.id.sortText);
radiusText = (EditText) findViewById(R.id.radiusText);
stText = (EditText) findViewById(R.id.stText);
jtText = (EditText) findViewById(R.id.jtText);
//startText = (EditText) findViewById(R.id.startText);
limitRes = (EditText) findViewById(R.id.limitRes);
fromAgeText = (EditText) findViewById(R.id.fromAgeText);
//filterText = (EditText) findViewById(R.id.filterText);
//latlongText = (EditText) findViewById(R.id.latlongText);
countryText = (EditText) findViewById(R.id.countryText);
//chnlText = (EditText) findViewById(R.id.chnlText);
userIpText = (EditText) findViewById(R.id.userIpText);
//browserText = (EditText) findViewById(R.id.browserText);
//version = (EditText) findViewById(R.id.version);
progressBar = (ProgressBar) findViewById(R.id.progressBar);
Button queryButton = (Button) findViewById(R.id.queryButton);
//list = (ListView) findViewById(R.id.resultList);
queryButton.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v) {
String query = queryText.getText().toString();
String location = locationText.getText().toString();
String tx = txText.getText().toString();
String sort = sortText.getText().toString();
String radius = radiusText.getText().toString();
String st = stText.getText().toString();
String jobtype = jtText.getText().toString();
//String start = startText.getText().toString();
String limit = limitRes.getText().toString();
String fromAge = fromAgeText.getText().toString();
//String filter = filterText.getText().toString();
//String latlong = latlongText.getText().toString();
String country = countryText.getText().toString();
//String chnlTxt = chnlText.getText().toString();
String userIp = userIpText.getText().toString();
//String browser = browserText.getText().toString();
//String versionTx = version.getText().toString();
//ArrayList<String> arl= new ArrayList<String>();
//arl.add(query);
new RetrieveFeedTask().execute(query, location, tx, sort, radius, st, jobtype,"1",limit,fromAge,"1","1",country,"null",userIp, "chrome","2");
//responseView.setText(url);
Log.e("ERROR","In button call");
Log.i("INFO","Inside Button call");
}
});
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// getting values from selected ListItem
String name = ((TextView) view.findViewById(R.id.tvTitle)).getText().toString();
// create intent to start another activity
Intent intent = new Intent(MainActivity.this, DetailsActivity.class);
//Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(resultlist.get(position).getJobtitle()));
// add the selected text item to our intent.
intent.putExtra("title", name);
startActivity(intent);
}
});
}
class RetrieveFeedTask extends AsyncTask<String, String, String> {
private Exception exception;
String tempResponse = "";
protected void onPreExecute() {
waitProgress = ProgressDialog.show(MainActivity.this, "", "Loading... please wait...");
// progressBar.setVisibility(View.VISIBLE);
// responseView.setAdapter(null);//.setText(" ");
Log.e("ERROR","In onPreExecute call");
Log.i("INFO","Inside onPreExecutecall");
}
protected String doInBackground(String... args) {
// Do some validation here
String query = args[0];
String location = args[1];
String tx = args[2];
String sort = args[3];
String radius = args[4];
String st = args[5];
String jobtype = args[6];
String start = args[7];
String limit = args[8];
String fromAge = args[9];
String filter = args[10];
String latlong = args[11];
String country = args[12];
String chnlTxt = args[13];
String userIp = args[14];
String browser = args[15];
String versionTx = args[16];
finalUrl = API_URL + "publisher=" + API_KEY + "&q=" + query + "&l=" + location + "," + tx + "&sort=" + sort + "&radius=" + radius + "&st=" + st + "&jt=" + jobtype + "&start=" + start + "&limit=" + limit + "&fromage=" + fromAge + "&filter=" + filter + "&latlong=" + latlong + "&co=" + country + "&chnl=" + chnlTxt + "&userip=" + userIp + "&useragent=" + browser + "&v=" + versionTx;
//finalUrl= "http://api.xyz.com/ads/apisearch?publisher=2986470692413324&q=java&l=BANGALORE%2C+karnataka&sort=date&radius=25&st=jobsite&jt=fulltime&start=1&limit=10&fromage=14&filter=1&latlong=1&co=india&chnl=null&userip=122.166.158.225&useragent=Chrome&v=2";
SAXParser();
return "";
}
protected void onPostExecute(String response) {
/* if (response == null || response.trim().equals("")) {
response = "THERE WAS AN ERROR";
}*/
/* if (rList == null) {
responseView.setAdapter(null); //setText("Error");
//return;
}*/
// progressBar.setVisibility(View.GONE);
//Log.i("INFO", response);
// getting values from selected ListItem
// Bundle bundle= new Bundle();
String name = ((TextView) findViewById(R.id.tvTitle)).getText().toString();
Bundle bundle= new Bundle();
// create intent to start another activity
//bundle.putString("name",result.getJobtitle());
Intent intent2 = new Intent(MainActivity.this, ResultListView.class);
//Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(resultlist.get(position).getJobtitle()));
// add the selected text item to our intent.
//intent2.putExtra("title", name);
bundle.putString("title",name);
intent2.putExtra("pBundle",bundle);
startActivity(intent2);
//displayData();
if (waitProgress != null) {
waitProgress.dismiss();
}
}
/* protected void onPostExecute()
{ progressBar.setVisibility(View.GONE);
displayData();
}*/
private void SAXParser(){
try {
SAXParserFactory factory = SAXParserFactory.newInstance();
// create a parser
//XMLReader xmlreader = factory.getXMLReader();
SAXParser parser = factory.newSAXParser();
resultlist = new ArrayList<Result>();
URL ul = new URL(finalUrl);
URLConnection uc = ul.openConnection();
ResultHandler resultHandler = new ResultHandler(resultlist);
// assign our handler
// xmlreader.setContentHandler(resultHandler);
// perform the synchronous parse
parser.parse(new InputSource(uc.getInputStream()), resultHandler);
resultlist = resultHandler.getResultList();
Log.e("ERROR","In SAXParser call");
Log.i("INFO","Inside SAXParser");
} catch (Exception e) {
e.printStackTrace();
}
Log.e("ERROR","In doInBackground call");
Log.i("INFO","Inside doInBackgr call");
// SAXParser();
}
}
activity_main.xml
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:fillViewport="true"
android:layout_height="match_parent"
android:layout_width="match_parent">
<LinearLayout
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="portfolio.first_app.practice.com.simplewebapi3.xyzJobActivity">
<EditText
android:id="@+id/queryText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the Skill"/>
<!--android:inputType="textEmailAddress"-->
<EditText
android:id="@+id/locationText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the Location"/>
<EditText
android:id="@+id/txText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the State"/>
<EditText
android:id="@+id/sortText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the Date"/>
<EditText
android:id="@+id/radiusText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the Radius"/>
<EditText
android:id="@+id/stText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the Site Type"/>
<EditText
android:id="@+id/jtText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the Job Type"/>
<!-- <EditText
android:id="@+id/startText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the Start Index of the Result"/>-->
<EditText
android:id="@+id/limitRes"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the Result Limit"/>
<EditText
android:id="@+id/fromAgeText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the Age"/>
<!-- <EditText
android:id="@+id/filterText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the Duplicate filter value"/>
<EditText
android:id="@+id/latlongText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the value 1 or 0"/>-->
<EditText
android:id="@+id/countryText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the Country"/>
<!-- <EditText
android:id="@+id/chnlText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the Group channel"/>-->
<EditText
android:id="@+id/userIpText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the User IP address"/>
<!-- <EditText
android:id="@+id/browserText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the Browser"/>
<EditText
android:id="@+id/version"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter the Version:"/>-->
<Button
android:id="@+id/queryButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end"
style="@style/Base.Widget.AppCompat.Button.Borderless"
android:text="Search"/>
<ProgressBar
android:id="@+id/progressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:indeterminate="true"
android:layout_centerHorizontal="true"
android:visibility="gone" />
</LinearLayout>
</ScrollView>
ResultListView.java
/** * 由 SouRAV 于 2016 年 6 月 15 日创建。 */
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
/**
* Created by SouRAV on 6/15/2016.
*/
public class ResultListView extends Activity {
TextView textView;
ListView list;
ArrayList<Result> resultlist;
private PostBaseAdapter adapter;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.result_list_view);
list = (ListView) findViewById(R.id.resultList);
textView = (TextView) findViewById(R.id.textView);
// get the intent from which this activity is called.
Intent intent2 = getIntent();
Bundle bundle= intent2.getBundleExtra("pBundle");
String text = bundle.getString("title");
textView.setText(text);
displayData1();
// fetch value from key-value pair and make it visible on TextView.
//Bundle intent2 = getIntent().getExtras();
//String list_data = intent2.getString("list");
// textView.setText(list_data);
}
private void displayData1() {
adapter = new PostBaseAdapter(ResultListView.this, resultlist);
adapter.notifyDataSetChanged();
list.setAdapter(adapter);
Log.e("ERROR","In displayData call");
Log.i("Info","Inside displaydata");
//Log.i("INFO", response);
// responseView.setText(response);
// ProgressBar.dismiss();
}
}
result_list_view.xml
<LinearLayout android:layout_height="wrap_content"
android:layout_width="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android" >
<ListView android:id="@+id/resultList"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
</ListView>
</LinearLayout>
结果.java
包portfolio.first_app.practice.com.xyzjobactivity3;
/**
* Created by SouRAV on 4/29/2016.
*/
import java.util.ArrayList;
import java.util.ArrayList;
public class Result {
public String jobtitle;
public String company;
public String city;
public String state;
public String country;
public String formattedLocation;
public String source;
public String date;
public String snippet;
public String url;
public String onmousedown;
public String lattitude;
public String longitude;
public String jobkey;
public String sponsored;
public String expired;
public String formattedLocationFull;
public String formattedRelativeTime;
public String getJobtitle() {
return jobtitle;
}
public void setJobtitle(String jobtitle) {
this.jobtitle = jobtitle;
}
public String getCompany() {
return company;
}
public void setCompany(String company) {
this.company = company;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public String getFormattedLocation() {
return formattedLocation;
}
public void setFormattedLocation(String formattedLocation) {
this.formattedLocation = formattedLocation;
}
public String getSource() {
return source;
}
public void setSource(String source) {
this.source = source;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public String getSnippet() {
return snippet;
}
public void setSnippet(String snippet) {
this.snippet = snippet;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getOnmousedown() {
return onmousedown;
}
public void setOnmousedown(String onmousedown) {
this.onmousedown = onmousedown;
}
public String getLattitude() {
return lattitude;
}
public void setLattitude(String lattitude) {
this.lattitude = lattitude;
}
public String getLongitude() {
return longitude;
}
public void setLongitude(String longitude) {
this.longitude = longitude;
}
public String getJobkey() {
return jobkey;
}
public void setJobkey(String jobkey) {
this.jobkey = jobkey;
}
public String getSponsored() {
return sponsored;
}
public void setSponsored(String sponsored) {
this.sponsored = sponsored;
}
public String getExpired() {
return expired;
}
public void setExpired(String expired) {
this.expired = expired;
}
public String getFormattedLocationFull() {
return formattedLocationFull;
}
public void setFormattedLocationFull(String formattedLocationFull) {
this.formattedLocationFull = formattedLocationFull;
}
public String getFormattedRelativeTime() {
return formattedRelativeTime;
}
public void setFormattedRelativeTime(String formattedRelativeTime) {
this.formattedRelativeTime = formattedRelativeTime;
}
public String getDetails() {
String result = jobtitle + ": " + company + "\n" + city + "-" + state
+ "\n" + country + "\n" + formattedLocation +"\n" + source+"\n"+date+
"\n"+snippet+"\n"+url+"\n"+onmousedown+"\n"+lattitude+"\n"+longitude+"\n"
+jobkey+"\n"+sponsored+"\n"+expired+"\n"+formattedLocationFull+"\n"+formattedRelativeTime;
return result;
}
}
我没有显示解析 XML 数据，因为它工作正常。问题很简单，我正在使用 Intent ，但无法在 ListView 中显示它。我问的是 postExecute(); 内的代码
最佳答案
通过Parcelable接口(interface)实现Result。现在从服务器获取数据后，只需将 ArrayList 放入 Intent 中，然后在 ResultActivity 中检索它们即可。
在 list.setItemClickListener 中 -
Intent intent = new Intent(MainActivity.this, DetailsActivity.class);
intent.putParcelableArrayListExtra("RESULT", resultlist);
intent.putExtra("title", name);
startActivity(intent);
再次在 Result Activity 的 onCreate 中不要忘记初始化结果列表 -
resultlist = getIntent().getParcelableArrayExtra("RESULT");
希望对你有帮助:)
关于java - 通过 REST API 检索结果并将其显示在新 Activity 的 ListView 中( ListView 出现小问题)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37885178/