Develop Reference

How to get specific list item and pass the two values from one activity to another?

I am developing an Android app and I in my SecondActivity I have parsed some JSON values as a listview and I want to open up ThirdActivity when a particular list item is clicked and send the values "name" and "number" to the ThirdActivity.
I have tried by creating an Intent in the OnPostExecute method. But am unable to figure out how to pass the values on to the next activity.
package com.example.acer.videoapp;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.HashMap;
public class SecondActivity extends AppCompatActivity {
private String TAG = MainActivity.class.getSimpleName();
private ProgressDialog pDialog;
private ListView listView1;
Toolbar toolbar1;
String subjectName;
ArrayList<HashMap<String, String>> lessonList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
//setting title to toolbar
toolbar1 = (Toolbar) findViewById(R.id.toolbar1);
Bundle bundle = getIntent().getExtras();
if(bundle!=null) {
toolbar1.setTitle(bundle.getString("Subject"));
subjectName=toolbar1.getTitle().toString();
}
lessonList = new ArrayList<>();
listView1 = (ListView) findViewById(R.id.list);
new GetLessons().execute();
}
/* Async task class to get json by making HTTP call */
private class GetLessons extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(SecondActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();
}
#Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
String url = getResources().getString(R.string.lessons_url, subjectName);
String jsonStr = sh.makeServiceCall(url);
Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
try {
// Getting JSON Array
JSONArray lessons = new JSONArray(jsonStr);
// looping through All lessons
for (int i = 0; i < lessons.length(); i++) {
JSONObject c = lessons.getJSONObject(i);
String number = c.getString("lessonNo");
String name = c.getString("lessonName");
// tmp hash map for single lesson
HashMap<String, String> lesson = new HashMap<>();
// adding each child node to HashMap key => value
lesson.put("number", number);
lesson.put("name", name);
// adding lesson to lesson list
lessonList.add(lesson);
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),"Json parsing error: " + e.getMessage(),Toast.LENGTH_LONG).show();
}
});
}
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
#Override
public void run() {
Toast.makeText(getApplicationContext(),"Couldn't get json from server. Check LogCat for possible errors!",Toast.LENGTH_LONG).show();
}
});
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
SecondActivity.this, lessonList,R.layout.list_item, new String[]{"number", "name",}, new int[]{R.id.lnumber,R.id.lname});
listView1.setAdapter(adapter);
listView1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int i, long id) {
Intent intent = new Intent(SecondActivity.this, ThirdActivity.class);
//intent.putExtra("Lesson", listView1.getItemAtPosition(i).toString());
startActivity(intent);
}
});
}
}
}

Can you try this please
listView1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int i, long id) {
Intent intent = new Intent(SecondActivity.this, ThirdActivity.class);
HashMap<String, String> lesson = lessonList.get(i);
intent.putExtra("number", lesson.get("number"));
intent.putExtra("name", lesson.get("name"));
startActivity(intent);
}});

Similar question has been asked before. You have most of it in place, just use Intent.PutStringArrayListExtra and then getIntent.getStringArrayListExtra to pass objects between the activities.
Check this:
Intent.putExtra List

Data didnt load, and not error or warning display

i got trouble, im try convert my fragment into activity, and when im try running the apps, all data not load and no warning or error shown, pls someone help
import android.app.Dialog;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.TextView;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.NetworkImageView;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class RekomendasiExercise extends AppCompatActivity implements AdapterView.OnItemClickListener{
// Log tag
private static final String TAG = AbdominalFragment.class.getSimpleName();
// Movies json url
private static final String url = "http://......";
private ProgressDialog pDialog;
private List<Exercise> exerciseList = new ArrayList<Exercise>();
private ListView listView;
private CustomListAdapter adapter;
public RekomendasiExercise() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_list, container, false);
// Inflate the layout for this fragment
final ListView listView = (ListView) rootView.findViewById(R.id.list);
adapter = new CustomListAdapter(this, exerciseList);
listView.setAdapter(adapter);
pDialog = new ProgressDialog(this);
// Showing progress dialog before making http request
pDialog.setMessage("Loading...");
pDialog.show();
if(exerciseList.isEmpty()) {
// Creating volley request obj
JsonArrayRequest exerciseReq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
exerciseList.clear();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
Exercise exercise = new Exercise();
if (obj.getString("tipe").equals("abdominal")) {
exercise.setNama(obj.getString("nama"));
exercise.setGambar1(obj.getString("gambar1"));
// Genre is json array
// adding movie to movies array
exerciseList.add(exercise);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(exerciseReq);
}else{
hidePDialog();
}
listView.setOnItemClickListener(this);
return rootView;
}
#Override
public void onItemClick(AdapterView<?> parent, View convertView, int position, long id) {
// Create custom dialog object
final Dialog dialog = new Dialog(this);
// Include dialog.xml file
dialog.setContentView(R.layout.dialog); // layout of your dialog
ImageLoader imageLoader = AppController.getInstance().getImageLoader();
NetworkImageView thumbnail1 = (NetworkImageView ) dialog.findViewById(R.id.gambar1);
thumbnail1.setImageUrl(exerciseList.get(position).getGambar1(), imageLoader);
// Set dialog title
dialog.setTitle("Detail");
// set values for custom dialog components - text, image and button
TextView nama = (TextView) dialog.findViewById(R.id.nama);
nama.setText("Nama = " + exerciseList.get(position).getNama());
dialog.show();
}
}
if default in Fragment its running perfectly and no problem, but when im try using activity all data not load.

I can't see any code that would run when the activity is created. You have an onCreateView method (which I am guessing you are carrying over from your Fragment based implementation). Unless somewhere in your code (which I cannot see how) you are calling that method, it never gets called since it is not part of the Activity lifecycle. I would copy over the entire code from that method to onCreate method (as a starting point) and delete the method. I would then make the following changes to the first few lines
// View rootView = inflater.inflate(R.layout.activity_list, container, false);
// Noticed that I commented out the above line and changed the line below
final ListView listView = (ListView) findViewById(R.id.list);
I am not suggesting that this will solve all of your problems as there might be (likely) other issues, but you should potentially be the first step. I strongly suggest you get more familiar with the Activity and Fragment classes and become more comfortable with their lifecycles. Also, you should get rid of
public RekomendasiExercise() {
// Required empty public constructor
}
Best of luck

Android: Convert ListActivity into ListFragment?

Hello I am using the tutorial from androidhive for working with MySQL and so on.
I want to use the following activity as a fragment - but I have to transfer the ListActivity into ListFragment - when I just change the extend from ListActivity to ListFragment different error appear
AllProductsActivity.java
package com.example.androidhive;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
public class AllProductsActivity extends ListActivity {
// Progress Dialog
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> productsList;
// url to get all products list
private static String url_all_products = "http://api.androidhive.info/android_connect/get_all_products.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_PRODUCTS = "products";
private static final String TAG_PID = "pid";
private static final String TAG_NAME = "name";
// products JSONArray
JSONArray products = null;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.all_products);
// Hashmap for ListView
productsList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
new LoadAllProducts().execute();
// Get listview
ListView lv = getListView();
// on seleting single product
// launching Edit Product Screen
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String pid = ((TextView) view.findViewById(R.id.pid)).getText()
.toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(),
EditProductActivity.class);
// sending pid to next activity
in.putExtra(TAG_PID, pid);
// starting new activity and expecting some response back
startActivityForResult(in, 100);
}
});
}
// Response from Edit Product Activity
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// if result code 100
if (resultCode == 100) {
// if result code 100 is received
// means user edited/deleted product
// reload this screen again
Intent intent = getIntent();
finish();
startActivity(intent);
}
}
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadAllProducts extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(AllProductsActivity.this);
pDialog.setMessage("Loading products. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
// Check your log cat for JSON reponse
Log.d("All Products: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
products = json.getJSONArray(TAG_PRODUCTS);
// looping through All Products
for (int i = 0; i < products.length(); i++) {
JSONObject c = products.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_PID);
String name = c.getString(TAG_NAME);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_PID, id);
map.put(TAG_NAME, name);
// adding HashList to ArrayList
productsList.add(map);
}
} else {
// no products found
// Launch Add New product Activity
Intent i = new Intent(getApplicationContext(),
NewProductActivity.class);
// Closing all previous activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
AllProductsActivity.this, productsList,
R.layout.list_item, new String[] { TAG_PID,
TAG_NAME},
new int[] { R.id.pid, R.id.name });
// updating listview
setListAdapter(adapter);
}
});
}
}
}
What I have to change, so I can use that as a fragment?
Edit:
i tried to change the code a little bit following some tutorials on the web...
now it works better, but there is still some problems with onPostExecute...
the doInBackground gets all parameters from mysql. i can track that with debug, but somehow after doInBackground it get's there is an error..
package com.example.androidhive;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
public class AllProductsActivity extends ListFragment {
// Progress Dialog
private ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> productsList;
// url to get all products list
private static String url_all_products = "http://10.0.2.2/android_connect/get_all_products.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
private static final String TAG_PRODUCTS = "products";
private static final String TAG_PID = "pid";
private static final String TAG_NAME = "name";
// products JSONArray
JSONArray products = null;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
// Hashmap for ListView
// Hashmap for ListView
productsList = new ArrayList<HashMap<String, String>>();
// Loading products in Background Thread
new LoadAllProducts().execute();
return inflater.inflate(R.layout.all_products, container, false);
}
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadAllProducts extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Loading products. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);
// Check your log cat for JSON reponse
Log.d("All Products: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
products = json.getJSONArray(TAG_PRODUCTS);
// looping through All Products
for (int i = 0; i < products.length(); i++) {
JSONObject c = products.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_PID);
String name = c.getString(TAG_NAME);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_PID, id);
map.put(TAG_NAME, name);
// adding HashList to ArrayList
productsList.add(map);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
getActivity().runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
getActivity(), productsList,
R.layout.list_item, new String[] { TAG_PID,
TAG_NAME},
new int[] { R.id.pid, R.id.name });
// updating listview
setListAdapter(adapter);
}
});
}
}
}

You must create fragment in FragmentActivity. All code you need is below
MainActivity.java
public class MainActivity extends FragmentActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_activity);
int index=0;
MyListFragment f = MyListFragment.newInstance(index);
FragmentTransaction ft = getSupportFragmentManager()
.beginTransaction();
ft.replace(R.id.mylist, f);
ft.commit();
}//end oncreate
}//end activity
Layout fragment_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:baselineAligned="false"
android:layout_height="match_parent"
android:orientation="horizontal" >
<FrameLayout
android:id="#+id/mylist"
android:layout_weight="1"
android:layout_width="0px"
android:layout_height="match_parent" />
</LinearLayout>
MyListFragment.java
public class MyListFragment extends ListFragment {
public static MyListFragment newInstance(int index) {
MyListFragment f = new MyListFragment();
return f;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.layout_mylist, container, false);
//read products from web and list
//productsList = new ArrayList<HashMap<String, String>>();
//new LoadProducts().execute();
return v;
}
//end oncreateview
class LoadProducts extends AsyncTask<String, String, String> {
#Override
protected void onPreExecute() {
super.onPreExecute();
}
protected String doInBackground(String... args) {
return null;
}
protected void onPostExecute(String file_url) {
}
}
//end LoadProducts
}
layout_mylist.xml
<?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="wrap_content"
android:orientation="vertical" >
<TextView
android:id="#+id/details"
android:text="some text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#drawable/white"
android:textColor="#drawable/black"
android:textStyle="bold"
android:paddingTop="6dip"
android:paddingLeft="6dip"
android:textAppearance="?android:attr/textAppearanceMedium" />
<ListView
android:id="#android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>

undefined method or constructor error while extend to BaseFragment

I am getting some compile time error while extend to
BaseFragment.If I extend my VideoDetailFragment.java to Activity I doesn't get any
errors.
But I need to extend it to BaseFragment.Because I need to get the
ListViewwhile clicking that I can get the video displayed in that
url.
My issue is I am getting the Following Error:
The constructor ArrayAdapter(VideoDetailFragment, int, String[]) is undefined
The method finish() is undefined for the type VideoDetailFragment
The constructor Intent(VideoDetailFragment,
Class) is undefined
The constructor ProgressDialog(VideoDetailFragment) is undefined
Below I mentioned these all errors at the end of the Line.
VideoDetailFragment.java:
package com.sit.fth.frgment;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.app.ProgressDialog;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.fth.android.R;
import com.sit.fth.app.BaseFragment;
import com.sit.fth.model.JSONParser;
import com.sit.fth.activity.YoutubePlayActivity;
import java.util.ArrayList;
import java.util.List;
public class VideoDetailFragment extends BaseFragment {
// Categories must be pre-set
private String[] data = {"Category1", "Category2", "Category3"};
private final String TAG_VIDEOS = "videos";
private final String TAG_CAT = "video_category";
private final String TAG_URL = "video_url";
private final String TAG_TITLE = "video_title";
private List<String> videoTitles = new ArrayList<String>();
private List<String> videoURLs = new ArrayList<String>();
private ArrayAdapter<String> adapter;
private Object extras;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.list1, null);
ListView listView = ((ListView)view.findViewById(R.id.listview));
AdapterView.OnItemClickListener clickListener = null;
// Category view:
if (extras == null) {
clickListener = new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent intent = new Intent(VideoDetailFragment.this,VideoDetailFragment.class); ----->3rd Error
intent.putExtra("categoryName", data[position]);
startActivity(intent);
}
};
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, data); --->1st Error at this line
}
else { // Child view
// Get the category of this child
String categoryName = ((Bundle) extras).getString("categoryName");
if (categoryName == null)
finish(); ------>2nd Error
// Populate list with videos of "categoryName", by looping JSON data
new JSONParse(categoryName).execute();
clickListener = new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Intent intent = new Intent(VideoDetailFragment.this, YoutubePlayActivity.class); ----->Third Error
// Send video url and title to YoutubeActivity
intent.putExtra("videoUrl", videoURLs.get(position));
intent.putExtra("videoTitle", videoTitles.get(position));
startActivity(intent);
}
};
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, videoTitles); ---->First Error
}
listView.setAdapter(adapter);
listView.setTextFilterEnabled(true);
listView.setOnItemClickListener(clickListener);
return listView;
}
private class JSONParse extends AsyncTask<String, String, JSONObject> {
private ProgressDialog pDialog;
private String categoryName;
// Constructor // Get the categoryName of which videos will be found
public JSONParse(String category) {
this.categoryName = category;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
// Create a loading dialog when getting the videos
pDialog = new ProgressDialog(VideoDetailFragment.this); ---->4th Error
pDialog.setMessage("Getting Videos...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
#Override
protected JSONObject doInBackground(String... args) {
JSONParser jParser = new JSONParser();
// Get JSON from URL
JSONObject json = jParser.getJSONFromUrl(JSONUrl);
if (json == null)
return null;
try {
// Get video array
JSONArray videos = json.getJSONArray(TAG_VIDEOS);
// Loop all videos
for (int i=0; i<videos.length(); i++) {
JSONObject video = videos.getJSONObject(i);
Log.e("JSON:", "cat: "+video.getString(TAG_CAT)+",title: "+video.getString(TAG_TITLE)+", url: "+video.getString(TAG_URL));
// Check if video belongs to "categoryName"
if (video.getString(TAG_CAT).equals(categoryName)) {
addVideo(video);
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return json;
}
private void addVideo(JSONObject video) {
try {
// Add title and URL to their respective arrays
videoTitles.add(video.getString(TAG_TITLE));
videoURLs.add(video.getString(TAG_URL));
} catch (JSONException e) {
e.printStackTrace();
}
}
#Override
protected void onPostExecute(JSONObject json) {
// Close the "loading" dialog
pDialog.dismiss();
if (json == null) {
// Do something when there's no internet connection
// Or there are no videos to be displayed
}
else // Let the adapter notify ListView that it has new items
adapter.notifyDataSetChanged();
}
}
}
I doesn't know how to solve these.Anybody can help me with these.thank you.

#stephen.
Did u try to look for the crash where u are getting.
Plz see the following references where i think ur error will get resolved
1) Error: The constructor MainActivity.ScreenSlidePagerAdapter(FragmentManager) is undefined
2) FragmentPagerAdapter troubles and woes: Constructor Undefined
3)Why am I getting a Constructor Undefined error?
Let me know if you find some more issue or any kind of help is needed.
Thanks

You need to provide a reference to a Context, not a Fragment. Instead of adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, videoTitles), you should be doing adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, videoTitles);, and similarly passing in getActivity() instead of this for all the other methods where you have erros.

Fragments are not context objects. You need to pass the Activity object by using getActivity() as first argument in array adapter.
Instead of passing this in this line ==> adapter = new
ArrayAdapter(this,
android.R.layout.simple_list_item_1, data);
pass getActivity() like this:
adapter = new ArrayAdapter(getActivity(),
android.R.layout.simple_list_item_1, data);

error with calling class that extends asynctask to run it

I'm using class that extends AsyncTask but I have error at the line that executes the class
I couldn't figure it out
here is the class that includes my main class and the class that extends AsyncTask
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.example.androidhive.library.JSONParser;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.topics_list);
// Hashmap for ListView
TopicsList = new ArrayList<HashMap<String, String>>();
**// Loading products in Background Thread
new LoadAllTopics().execute();**
// Get listview
ListView lv = getListView();
// on seleting single product
// launching Edit Product Screen
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// getting values from selected ListItem
String tid = ((TextView) view.findViewById(R.id.tid)).getText()
.toString();
/**
* Background Async Task to Load all product by making HTTP Request
* */
class LoadAllTopics extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
#Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Topics_list.this);
pDialog.setMessage("Loading products. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest (url_all_topics, "GET", params);
// Check your log cat for JSON reponse
Log.d("All topics: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// products found
// Getting Array of Products
topics = json.getJSONArray(TAG_TOPICS);
// looping through All Products
for (int i = 0; i < topics.length(); i++) {
JSONObject c = topics.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_TOPICSID);
String topict = c.getString(TAG_TOPICTITLE);
String username = c.getString(TAG_TOPICAUTHOR);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_TOPICSID, id);
map.put(TAG_TOPICTITLE, topict);
map.put(TAG_TOPICAUTHOR, username);
// adding HashList to ArrayList
TopicsList.add(map);
}
} else {
// no products found
// Launch Add New product Activity
/* Intent i = new Intent(getApplicationContext(),
NewProductActivity.class);
// Closing all previous activities
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);*/
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(
Topics_list.this, TopicsList,
R.layout.list_item, new String[] { TAG_TOPICSID,TAG_TOPICTITLE,
TAG_TOPICAUTHOR},
new int[] { R.id.tid, R.id.name });
// updating listview
setListAdapter(adapter);
}
});
}
}
} });}}
the error is at the bold line
really appreciate your help

In Java you need to write the method inside the class. Put the onCreate inside Class.
public class MainActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
.....
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// getting values from selected ListItem
String tid = ((TextView) view.findViewById(R.id.tid)).getText()
.toString();
}
});
.........
}
private class LoadAllTopics extends AsyncTask<String, String, String> {
.....
}
}