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Моя простая программа, использующая listview с onItemClick, не отвечает при нажатии на элемент в списке.Список с onItemClick не отвечает вообще
Может кто-нибудь дать мне представление о том, как проверить их. Я новичок в андроиде и программировании. Ниже часть моей программы класса (ReadComments.java), который имеет ListView:
package com.lm.vciwhereabout;
import java.util.ArrayList;
import java.util.HashMap;
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.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.view.KeyEvent;
import android.content.DialogInterface;
import android.app.AlertDialog;
import android.widget.TextView;
import android.content.Context;
import android.content.SharedPreferences;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.ViewGroup;
import android.view.LayoutInflater;
import android.widget.CursorAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TabHost;
import android.widget.TextView;
import android.widget.Spinner;
public class ReadComments extends ListActivity {
public final static String ID_EXTRA="com.lm.vciwhereabout._ID";
// Progress Dialog
private ProgressDialog pDialog;
// php read comments script
// localhost :
// testing on your device
// put your local ip instead, on windows, run CMD > ipconfig
// or in mac's terminal type ifconfig and look for the ip under en0 or en1
// private static final String READ_COMMENTS_URL =
// "http://xxx.xxx.x.x:1234/webservice/comments.php";
// testing on Emulator:
private static final String READ_COMMENTS_URL = "http://192.168.0.245/vciwhereabout/wabout.php";
// testing from a real server:
// private static final String READ_COMMENTS_URL =
// "http://www.mybringback.com/webservice/comments.php";
// JSON IDS:
private static final String TAG_SUCCESS = "success";
// private static final String TAG_TITLE = "title";
private static final String TAG_POSTS = "posts";
private static final String TAG_POST_ID = "post_id";
private static final String TAG_USERNAME = "username";
private static final String TAG_FDATE = "fdate";
private static final String TAG_TDATE = "tdate";
private static final String TAG_FTIME = "ftime";
private static final String TAG_TTIME = "ttime";
private static final String TAG_CUSTBRANCH = "custbranch";
private static final String TAG_CUSTNAME = "custname";
private static final String TAG_CUSTADDR = "custaddr";
private static final String TAG_CUSTCITY = "custcity";
private static final String TAG_NOTE = "note";
// it's important to note that the message is both in the parent branch of
// our JSON tree that displays a "Post Available" or a "No Post Available"
// message,
// and there is also a message for each individual post, listed under the
// "posts"
// category, that displays what the user typed as their message.
// An array of all of our comments
private JSONArray mComments = null;
// manages all of our comments in a list.
private ArrayList<HashMap<String, String>> mCommentList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// note that use read_comments.xml instead of our single_post.xml
setContentView(R.layout.read_comments);
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
// loading the comments via AsyncTask
new LoadComments().execute();
}
public void addComment(View v) {
Intent i = new Intent(ReadComments.this, AddComment.class);
startActivity(i);
}
/**
* Retrieves recent post data from the server.
*/
public void updateJSONdata() {
// Instantiate the arraylist to contain all the JSON data.
// we are going to use a bunch of key-value pairs, referring
// to the json element name, and the content, for example,
// message it the tag, and "I'm awesome" as the content..
mCommentList = new ArrayList<HashMap<String, String>>();
// Bro, it's time to power up the J parser
JSONParser jParser = new JSONParser();
// Feed the beast our comments url, and it spits us
// back a JSON object. Boo-yeah Jerome.
JSONObject json = jParser.getJSONFromUrl(READ_COMMENTS_URL);
// when parsing JSON stuff, we should probably
// try to catch any exceptions:
try {
// I know I said we would check if "Posts were Avail." (success==1)
// before we tried to read the individual posts, but I lied...
// mComments will tell us how many "posts" or comments are
// available
mComments = json.getJSONArray(TAG_POSTS);
// looping through all posts according to the json object returned
for (int i = 0; i < mComments.length(); i++) {
JSONObject c = mComments.getJSONObject(i);
// gets the content of each tag
String username = c.getString(TAG_USERNAME);
String fdate = c.getString(TAG_FDATE);
String tdate = c.getString(TAG_TDATE);
String ftime = c.getString(TAG_FTIME);
String ttime = c.getString(TAG_TTIME);
String custbranch = c.getString(TAG_CUSTBRANCH);
String custname = c.getString(TAG_CUSTNAME);
String custaddr = c.getString(TAG_CUSTADDR);
String custcity = c.getString(TAG_CUSTCITY);
String note = c.getString(TAG_NOTE);
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_USERNAME, username);
map.put(TAG_FDATE, fdate);
map.put(TAG_TDATE, tdate);
map.put(TAG_FTIME, ftime);
map.put(TAG_TTIME, ttime);
map.put(TAG_CUSTBRANCH, custbranch);
map.put(TAG_CUSTNAME, custname);
map.put(TAG_CUSTADDR, custaddr);
map.put(TAG_CUSTCITY, custcity);
map.put(TAG_NOTE, note);
// adding HashList to ArrayList
mCommentList.add(map);
// annndddd, our JSON data is up to date same with our array
// list
}
} catch (JSONException e) {
e.printStackTrace();
}
}
/**
* Inserts the parsed data into the listview.
*/
private void updateList() {
// For a ListActivity we need to set the List Adapter, and in order to do
//that, we need to create a ListAdapter. This SimpleAdapter,
//will utilize our updated Hashmapped ArrayList,
//use our single_post xml template for each item in our list,
//and place the appropriate info from the list to the
//correct GUI id. Order is important here.
ListAdapter adapter = new SimpleAdapter
(this, mCommentList,
R.layout.single_post, new String[] {
TAG_USERNAME,
TAG_FDATE,
TAG_TDATE,
TAG_FTIME,
TAG_TTIME,
TAG_CUSTBRANCH,
TAG_CUSTNAME,
TAG_CUSTADDR,
TAG_CUSTCITY,
TAG_NOTE },
new int[] { R.id.username,
R.id.fdate, R.id.tdate,
R.id.ftime, R.id.ttime, R.id.custbranch, R.id.custname,
R.id.custaddr, R.id.custcity, R.id.note });
setListAdapter(adapter);
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String username = ((TextView) view.findViewById(R.id.username))
.getText().toString();
String fdate = ((TextView) view.findViewById(R.id.fdate))
.getText().toString();
String tdate = ((TextView) view.findViewById(R.id.tdate))
.getText().toString();
String ftime = ((TextView) view.findViewById(R.id.ftime))
.getText().toString();
String ttime = ((TextView) view.findViewById(R.id.ttime))
.getText().toString();
String custbranch = ((TextView) view.findViewById(R.id.custbranch))
.getText().toString();
String custname = ((TextView) view.findViewById(R.id.custname))
.getText().toString();
String custaddr = ((TextView) view.findViewById(R.id.custaddr))
.getText().toString();
String custcity = ((TextView) view.findViewById(R.id.custcity))
.getText().toString();
String note = ((TextView) view.findViewById(R.id.note))
.getText().toString();
// Starting single contact activity
Intent in = new Intent(getApplicationContext(),
SingleContactActivity.class);
in.putExtra(TAG_USERNAME, username);
in.putExtra(TAG_FDATE, fdate);
in.putExtra(TAG_TDATE, tdate);
in.putExtra(TAG_FTIME, ftime);
in.putExtra(TAG_TTIME, ttime);
in.putExtra(TAG_CUSTBRANCH, custbranch);
in.putExtra(TAG_CUSTNAME, custname);
in.putExtra(TAG_CUSTADDR, custaddr);
in.putExtra(TAG_CUSTBRANCH, custbranch);
in.putExtra(TAG_CUSTCITY, custcity);
in.putExtra(TAG_NOTE, note);
startActivity(in);
}
});
}
И он должен начать класс SingleContactActivity ниже, но никогда не начал:
package com.lm.vciwhereabout;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
// import info.androidhive.jsonparsing.R;
public class SingleContactActivity extends Activity {
// JSON node keys
private static final String TAG_USERNAME = "username";
private static final String TAG_FDATE = "fdate";
private static final String TAG_TDATE = "tdate";
private static final String TAG_FTIME = "ftime";
private static final String TAG_TTIME = "ttime";
private static final String TAG_CUSTBRANCH = "custbranch";
private static final String TAG_CUSTNAME = "custname";
private static final String TAG_CUSTADDR = "custaddr";
private static final String TAG_CUSTCITY = "custcity";
private static final String TAG_NOTE = "note";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_single_contact);
// getting intent data
Intent in = getIntent();
// Get JSON values from previous intent
String username = in.getStringExtra(TAG_USERNAME);
String fdate = in.getStringExtra(TAG_FDATE);
String tdate = in.getStringExtra(TAG_TDATE);
String ftime = in.getStringExtra(TAG_FTIME);
String ttime = in.getStringExtra(TAG_TTIME);
String custbranch = in.getStringExtra(TAG_CUSTBRANCH);
String custname = in.getStringExtra(TAG_CUSTNAME);
String custaddr = in.getStringExtra(TAG_CUSTADDR);
String custcity = in.getStringExtra(TAG_CUSTCITY);
String note = in.getStringExtra(TAG_NOTE);
// Displaying all values on the screen
TextView lblUsername = (TextView) findViewById(R.id.username_label);
TextView lblFdate = (TextView) findViewById(R.id.fdate_label);
TextView lblTdate = (TextView) findViewById(R.id.tdate_label);
TextView lblFtime = (TextView) findViewById(R.id.ftime_label);
TextView lblTtime = (TextView) findViewById(R.id.ttime_label);
TextView lblCustbranch = (TextView) findViewById(R.id.custbranch_label);
TextView lblCustname = (TextView) findViewById(R.id.custname_label);
TextView lblCustaddr = (TextView) findViewById(R.id.custaddr_label);
TextView lblCustcity = (TextView) findViewById(R.id.custcity_label);
TextView lblNote = (TextView) findViewById(R.id.note_label);
lblUsername.setText(username);
lblFdate.setText(fdate);
lblTdate.setText(tdate);
lblFtime.setText(ftime);
lblTtime.setText(ttime);
lblCustbranch.setText(custbranch);
lblCustname.setText(custname);
lblCustaddr.setText(custaddr);
lblCustcity.setText(custcity);
lblNote.setText(note);
}
}
Я уже поставил классы на манифеста, как показано ниже:
<activity
android:name="com.lm.vciwhereabout.ReadComments"
android:label="@string/app_name" >
</activity>
<activity
android:name="com.lm.vciwhereabout.QueriesMenu"
android:label="@string/app_name" >
</activity>
<activity
android:name="com.lm.vciwhereabout.querywabyname"
android:label="@string/app_name" >
</activity>
<activity
android:name="com.lm.vciwhereabout.querynameentry"
android:label="@string/app_name" >
</activity>
<activity
android:name="com.lm.vciwhereabout.SingleContactActivity"
android:label="@string/app_name" >
</activity>
И это расположение основного класса (ReadComments.java):
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
android:id="@+id/widget60"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="3dp"
android:background="@drawable/post_border_style"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/box"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="2dp"
android:background="@drawable/post_background_style"
android:orientation="horizontal" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/logo3s" />
<LinearLayout
android:id="@+id/box"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="2dp"
android:orientation="vertical"
android:padding="5dp" >
<TableLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:stretchColumns="1"
>
<TableRow>
<TextView android:text="Username :" />
<TextView android:id="@+id/username"
/>
</TableRow>
<TableRow>
<TextView android:text="Fromdate :" />
<TextView android:id="@+id/fdate"
/>
</TableRow>
<TableRow>
<TextView android:text="Fromtime :" />
<TextView android:id="@+id/ftime" />
</TableRow>
<TableRow>
<TextView android:text="Cust/Br.Name :" />
<TextView android:id="@+id/custname" />
</TableRow>
</TableLayout>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</ScrollView>
Плюс ниже - схема нового намерения, которое должно быть запущено (singlecontactactivity.java). Имя - activity_single_contact.xml.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp">
<!-- Name Label -->
<TextView android:id="@+id/username_label"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="25dip"
android:textStyle="bold"
android:paddingTop="10dip"
android:paddingBottom="10dip"
android:textColor="#43bd00"/>
<!-- From Date Label -->
<TextView android:id="@+id/fdate_label"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#acacac"/>
<!-- To Date Label -->
<TextView android:id="@+id/tdate_label"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView android:id="@+id/ftime_label"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView android:id="@+id/ttime_label"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView android:id="@+id/custbranch_label"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView android:id="@+id/custname_label"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView android:id="@+id/custaddr_label"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView android:id="@+id/custcity_label"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<TextView android:id="@+id/note_label"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
</LinearLayout>
Любая идея очень ценится. Большое спасибо.
Я изменил код и поместил getListView(). SetOnItemClickListener в onCreate methot, но все равно получит NPE.
Новый обновленный ReadComments.java ниже:
public class ReadComments<updateList> extends ListActivity {
private ProgressDialog pDialog;
private static final String READ_COMMENTS_URL = "http://192.168.0.245/vciwhereabout/wabout.php";
private static final String TAG_MCOMMENTS = "mcomments";
private static final String TAG_POST_ID = "post_id";
private static final String TAG_POSTS = "posts";
private static final String TAG_USERNAME = "username";
private static final String TAG_FDATE = "fdate";
private static final String TAG_TDATE = "tdate";
private static final String TAG_FTIME = "ftime";
private static final String TAG_TTIME = "ttime";
private static final String TAG_CUSTBRANCH = "custbranch";
private static final String TAG_CUSTNAME = "custname";
private static final String TAG_CUSTADDR = "custaddr";
private static final String TAG_CUSTCITY = "custcity";
private static final String TAG_NOTE = "note";
JSONArray mComments = null;
ArrayList<HashMap<String, String>> mCommentList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.read_comments);
mCommentList = new ArrayList<HashMap<String, String>>();
ListView lv = getListView();
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String post_id = ((TextView) view.findViewById(R.id.post_id))
.getText().toString();
String username = ((TextView) view.findViewById(R.id.username))
.getText().toString();
String fdate = ((TextView) view.findViewById(R.id.fdate))
.getText().toString();
String tdate = ((TextView) view.findViewById(R.id.tdate))
.getText().toString();
String ftime = ((TextView) view.findViewById(R.id.ftime))
.getText().toString();
String ttime = ((TextView) view.findViewById(R.id.ttime))
.getText().toString();
String custbranch = ((TextView) view.findViewById(R.id.custbranch))
.getText().toString();
String custname = ((TextView) view.findViewById(R.id.custname))
.getText().toString();
String custaddr = ((TextView) view.findViewById(R.id.custaddr))
.getText().toString();
String custcity = ((TextView) view.findViewById(R.id.custcity))
.getText().toString();
String note = ((TextView) view.findViewById(R.id.note))
.getText().toString();
Intent in = new Intent(ReadComments.this, SingleContactActivity.class);
in.putExtra(TAG_POST_ID, post_id);
in.putExtra(TAG_USERNAME, username);
in.putExtra(TAG_USERNAME, username);
in.putExtra(TAG_FDATE, fdate);
in.putExtra(TAG_TDATE, tdate);
in.putExtra(TAG_FTIME, ftime);
in.putExtra(TAG_TTIME, ttime);
in.putExtra(TAG_CUSTBRANCH, custbranch);
in.putExtra(TAG_CUSTNAME, custname);
in.putExtra(TAG_CUSTADDR, custaddr);
in.putExtra(TAG_CUSTBRANCH, custbranch);
in.putExtra(TAG_CUSTCITY, custcity);
in.putExtra(TAG_NOTE, note);
// in.putExtra(ID_EXTRA, String.valueOf(id));
startActivity(in);
}
});
}
@Override
protected void onResume() {
super.onResume();
// loading the comments via AsyncTask
new LoadComments().execute();
}
public void addComment(View v) {
Intent i = new Intent(ReadComments.this, AddComment.class);
startActivity(i);
}
/**
* Retrieves recent post data from the server.
*/
public void updateJSONdata() {
mCommentList = new ArrayList<HashMap<String, String>>();
JSONParser jParser = new JSONParser();
JSONObject json = jParser.getJSONFromUrl(READ_COMMENTS_URL);
try {
mComments = json.getJSONArray(TAG_POSTS);
for (int i = 0; i < mComments.length(); i++) {
JSONObject c = mComments.getJSONObject(i);
String post_id = c.getString(TAG_POST_ID);
String username = c.getString(TAG_USERNAME);
String fdate = c.getString(TAG_FDATE);
String tdate = c.getString(TAG_TDATE);
String ftime = c.getString(TAG_FTIME);
String ttime = c.getString(TAG_TTIME);
String custbranch = c.getString(TAG_CUSTBRANCH);
String custname = c.getString(TAG_CUSTNAME);
String custaddr = c.getString(TAG_CUSTADDR);
String custcity = c.getString(TAG_CUSTCITY);
String note = c.getString(TAG_NOTE);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_POST_ID, post_id);
map.put(TAG_USERNAME, username);
map.put(TAG_FDATE, fdate);
map.put(TAG_TDATE, tdate);
map.put(TAG_FTIME, ftime);
map.put(TAG_TTIME, ttime);
map.put(TAG_CUSTBRANCH, custbranch);
map.put(TAG_CUSTNAME, custname);
map.put(TAG_CUSTADDR, custaddr);
map.put(TAG_CUSTCITY, custcity);
map.put(TAG_NOTE, note);
mCommentList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
}
/**
* Inserts the parsed data into the listview.
*/
private void updateList() {
ListAdapter adapter = new SimpleAdapter
(this, mCommentList,
R.layout.single_post, new String[] {
TAG_POST_ID,
TAG_USERNAME,
TAG_FDATE,
TAG_TDATE,
TAG_FTIME,
TAG_TTIME,
TAG_CUSTBRANCH,
TAG_CUSTNAME,
TAG_CUSTADDR,
TAG_CUSTCITY,
TAG_NOTE },
new int[] { R.id.post_id, R.id.username,
R.id.fdate, R.id.tdate,
R.id.ftime, R.id.ttime, R.id.custbranch, R.id.custname,
R.id.custaddr, R.id.custcity, R.id.note });
setListAdapter(adapter);
}
public class LoadComments extends AsyncTask<Void, Void, Boolean> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(ReadComments.this);
pDialog.setMessage("Loading Where About...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected Boolean doInBackground(Void... arg0) {
updateJSONdata();
return null;
}
@Override
protected void onPostExecute(Boolean result) {
super.onPostExecute(result);
pDialog.dismiss();
updateList();
}
}
public void queriesMenu(View v) {
Intent i = new Intent(ReadComments.this, QueriesMenu.class);
startActivity(i);
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
dialogOnBackPress();
return true;
}
return super.onKeyDown(keyCode, event);
}
protected void dialogOnBackPress() {
AlertDialog.Builder builder = new AlertDialog.Builder(ReadComments.this);
builder.setMessage("Are you sure you want to exit?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
ReadComments.this.finish();
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
}
Прямо сейчас, при нажатии одной из пункта, есть «ответ», но получил NPE, сразу после этого.
Эта линия: Намерение в новом = Намерении (getApplicationContext(), SingleContactActivity.class); должен. beact: Intent in = new Intent (ReadComments.this, SingleContactActivity.class) ;. Старайтесь избегать использования applicationContext, если это возможно. В этом случае всегда используйте локальный ActivityContext. – MABVT