Listview returns empty - android

Good day, I'm trying to build a book shelf with a horizontal list inside a list view but when the app runs, the listview is blank.
What am i missing?
Here's my code (and some code from a tutorial which i was using as a guide)
ListBook.java
public class ListBooks extends ActionBarActivity {
ListView listView;
private VerticalAdapter verListAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_books);
listView = (ListView)findViewById(R.id.listbooks);
BookItem book1 = new BookItem("Fist of Fury");
BookItem book2 = new BookItem("Fist of the fists");
BookItem book3 = new BookItem("Enders game");
BookItem book4 = new BookItem("Lovers");
ArrayList<BookItem> arrayList = new ArrayList<BookItem>();
arrayList.add(book1);
arrayList.add(book2);
ArrayList<BookItem> list = new ArrayList<BookItem>();
list.add(book3);
list.add(book4);
ArrayList<ArrayList<BookItem>> group = new ArrayList<ArrayList<BookItem>>();
group.add(arrayList);
group.add(list);
verListAdapter = new VerticalAdapter(this, R.layout.activity_book_list, group);
listView.setAdapter(verListAdapter);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_list_books, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private class VerticalAdapter extends ArrayAdapter<ArrayList<BookItem>> {
private int resource;
public VerticalAdapter(Context _context, int _ResourceId,
ArrayList<ArrayList<BookItem>> _items) {
super(_context, _ResourceId, _items);
this.resource = _ResourceId;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView;
if (convertView == null) {
rowView = LayoutInflater.from(getContext()).inflate(resource,
null);
} else {
rowView = convertView;
}
HorizontalListView hListView = (HorizontalListView) rowView
.findViewById(R.id.sublistview);
HorizontalAdapter horListAdapter = new HorizontalAdapter(
getContext(), R.layout.listitem, getItem(position));
hListView.setAdapter(horListAdapter);
return rowView;
}
}
private class HorizontalAdapter extends ArrayAdapter<BookItem> {
private int resource;
public HorizontalAdapter(Context _context, int _textViewResourceId,
ArrayList<BookItem> _items) {
super(_context, _textViewResourceId, _items);
this.resource = _textViewResourceId;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View retval = LayoutInflater.from(getContext()).inflate(
this.resource, null);
TextView topText = (TextView) retval.findViewById(R.id.title);
topText.setText(getItem(position).getTitle());
return retval;
}
}
}
Layout files
Listitem.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#fff">
<ImageView
android:id="#+id/image"
android:layout_width="150dip"
android:layout_height="150dip"
android:scaleType="centerCrop"
android:src="#drawable/wood"
/>
<TextView
android:id="#+id/title"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textColor="#000"
android:gravity="center_horizontal"
/>
</LinearLayout>
activity_book_list.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
tools:context="com.azed">
<com.HorizontalListView
android:id="#+id/sublistview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#ddd"/>
</LinearLayout>
activity_list_books.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.azed">
<ListView
android:id="#+id/listbooks"
android:layout_width="match_parent"
android:layout_height="match_parent"
></ListView>
</LinearLayout>

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I'm having trouble understanding how to use Intent to move list view elements. So I've made a separate project to practice this before actually figuring it out in my app. Basically, I want to have a "Favorites" activity that can be populated from something like a search results page. Instead of a search results page, I've just created a list view with some sample elements in them with a favorites button in each. I just need some guidance on how to go from there. Here is my code so far
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private int layout;
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layout = resource;
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#Override
public View getView(final int position, View convertView, ViewGroup
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ViewHolder minViewHolder = null;
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LayoutInflater inflater = LayoutInflater.from(getContext());
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ViewHolder viewHolder = new ViewHolder();
viewHolder.title = (TextView)
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viewHolder.button.setOnClickListener(new View.OnClickListener()
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#Override
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Toast.makeText(getContext(), "sent item " + position + "
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// data.remove(position);
MyListAdapter.this.notifyDataSetChanged();
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activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
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android:paddingBottom="#dimen/activity_vertical_margin"
tools:context=".MainActivity">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/listView"
android:layout_centerHorizontal="true" /> </RelativeLayout>
item_view.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
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android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Text"
android:id="#+id/list_item_text"
android:layout_alignParentTop="true"
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<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="fav"
android:id="#+id/favorites_button"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true" />
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I haven't set up a second activity because I wanted ideas on how to create a list that is empty but can be populated by that favorites button press. Any help at all is greatly appreciated!
Update arraylist according to favourite and call
adapter.notifyDataChanged();
if listview is same,
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I've called getText() on the textview, and it does show the correct information, however for some reason, it simply is not being rendered.
CustomAdapter:
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private Context context;
private ArrayList<String> numbers;
private LayoutInflater layoutInflater;
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return numbers.size();
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holder.numbers.setText(numbers.get(position));
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public final class ViewHolder
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public TextView numbers;
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MainActivity:
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private ListView listview;
CardListviewAdapter adapter;
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super.onCreate(savedInstanceState);
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populateConversations();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
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}
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private void populateConversations()
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Log.d("Populate", "Populating...");
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listview.setAdapter(adapter);
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Listview.xml Layout:
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android:layout_height="match_parent" android:paddingLeft="#dimen/activity_horizontal_margin"
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<ListView
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android:layout_height="wrap_content"
android:id="#+id/conversationListview" />
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conversation.xml layout:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="wrap_content"
android:background="#drawable/bg_card">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
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android:layout_alignParentStart="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
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Edit: Fixed Listview ID error, however result is unchanged.
Edit2: Problem was white background listview, and white text.
Answer credit to #N1to, provided in comments.
You have in code:
this.listview = (ListView)findViewById(R.id.Listview);
Where in your XML your id is different:
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/conversationListview" />
Also, move it to your activity_conversation_threads.xml, it doesn't need separate layout.
Add to class `ConversationThreads:
private ArrayList<String> numbers;
private CardListviewAdapter adapter;
And then change your method to:
private void populateConversations()
{
Log.d("Populate", "Populating...");
//Array of Strings returned -- Target Data
numbers = TSMS.getConversationNumbers(getApplicationContext());
Log.d("ArrayList size", String.valueOf(numbers.size()); // check if it returns non zero
adapter = new CardListviewAdapter(getApplicationContext(),numbers);
listview.setAdapter(adapter);
}
Code for adapter
public class CardListViewAdapter extends BaseAdapter {
private Context context;
private ArrayList<String> numbers;
public CardListViewAdapter(Context context, ArrayList<String> numbers) {
this.context = context;
this.numbers = numbers;
}
#Override
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return numbers.size();
}
#Override
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}
#Override
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return 0;
}
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public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
if (rowView == null) {
LayoutInflater layoutInflater = LayoutInflater.from(context);
rowView = layoutInflater.inflate(R.layout.conversation, null);
ViewHolder viewHolder = new ViewHolder(rowView);
rowView.setTag(viewHolder);
}
final ViewHolder holder = (ViewHolder) rowView.getTag();
holder.numbers.setText(numbers.get(position));
return rowView;
}
public class ViewHolder {
private final TextView numbers;
public ViewHolder(View v) {
this.numbers = (TextView) v.findViewById(R.id.numbertitle);
}
}
}

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I am trying to create a navigation draw which displays text and images. My project builds OK but when I open the navigation draw there is no text or images displayed. I have created a layout file for the image and text to be displayed on the navigation draw and I have set the adapter for the navigation draw as well as creating my own Adapter class.
I cant see what is wrong but something obviously is :) Any help is greatly appreciated.
Here are my files
navigation_draw_items.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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activity_main.xml
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="match_parent"
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//private String[] items;
private DrawerLayout mDrawerLayout;
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// To do
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// Handle action bar item clicks here. The action bar will
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Hi guys I have a problem with the cool lib from nhaarman
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<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent" android:layout_height="match_parent"
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android:layout_alignParentStart="true" />
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android:layout_height="wrap_content"
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android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_above="#+id/btn_newTask"
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Now I have the effect that the rows only fade in if i "spam" new rows so that I have to scroll down. So the list items which were hided appear now with the fade-effect. But the other list items which have room in the listview without scrolling are not fading.
Do you understand me?
Please help me :-)
I had the same problem, but the problem is not the fragment. The height of list_view must be match_parent.
<ListView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="#+id/taskListView"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_above="#+id/btn_newTask"
/>
description of the problem
Hope that helps

How to set OnClickListener in Listview to send to another activity

I'm making a android app that uses listview, I have problem where to put OnClickListener in the listview that I created in order to go to another activity but I haven't found a solution. Here is my code.
CuacaNowActivity.java
public class CuacaNowActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {
ListView listViewKab;
super.onCreate(savedInstanceState);
setTitle("Jogja Now");
setContentView(R.layout.cuacanow);
KabupatenNow weather_data[] = new KabupatenNow[]{
new KabupatenNow(R.drawable.ic_bantul, "Bantul"),
new KabupatenNow(R.drawable.ic_gunungkidul, "Wonosari"),
new KabupatenNow(R.drawable.ic_kulonprogo, "Wates"),
new KabupatenNow(R.drawable.ic_sleman, "Sleman"),
new KabupatenNow(R.drawable.ic_yogyakarta, "Yogyakarta")
};
KabupatenAdapter adapter = new KabupatenAdapter(this, R.layout.listkabupaten_row, weather_data);
listViewKab = (ListView) findViewById(R.id.listViewKab);
View header = (View) getLayoutInflater().inflate(R.layout.listviewheader, null);
listViewKab.addHeaderView(header);
listViewKab.setAdapter(adapter);
}
}
KabupatenAdapter.java
public class KabupatenAdapter extends ArrayAdapter<KabupatenNow>{
Context context;
int layoutResourceId;
KabupatenNow data[] = null;
public KabupatenAdapter(Context context, int layoutResourceId, KabupatenNow[] data) {
super (context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
}
//Viewing list Kabupaten in Yogyakarta with image in ListView
public View getView (int position, View convertView, ViewGroup parent){
View row = convertView;
WeatherHolder holder = null;
if (row == null)
{
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new WeatherHolder();
holder.imgKabupaten = (ImageView) row.findViewById(R.id.imgKabupaten);
holder.txtTitle = (TextView) row.findViewById(R.id.txtTitle);
row.setTag(holder);
}else{
holder = (WeatherHolder) row.getTag();
}
KabupatenNow weather = data[position];
holder.txtTitle.setText(weather.title);
holder.imgKabupaten.setImageResource(weather.icon);
return row;
}
static class WeatherHolder {
ImageView imgKabupaten;
TextView txtTitle;
}
}
KabupatenNow
public class KabupatenNow {
public int icon;
public String title;
public KabupatenNow(){
super();
}
public KabupatenNow(int icon, String title) {
super();
this.icon = icon;
this.title = title;
}
}
and here is the xml code
cuacanow.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/ic_background"
android:orientation="vertical" >
<ListView
android:id="#+id/listViewKab"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:cacheColorHint="#00000000" >
</ListView>
</LinearLayout>
listviewheader.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="match_parent"
android:orientation="horizontal" >
<TextView
android:id="#+id/txtHeader"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="true"
android:background="#8B0000"
android:gravity="center_vertical"
android:padding="10dp"
android:text="Cuaca Kabupaten"
android:textColor="#FFFFFF"
android:textSize="22dp"
android:textStyle="bold" />
</LinearLayout>
listkabupaten_row.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="match_parent"
android:orientation="horizontal" >
<ImageView
android:id="#+id/imgKabupaten"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="true"
android:layout_marginBottom="5dp"
android:layout_marginRight="15dp"
android:layout_marginTop="5dp"
android:gravity="center_vertical" />
<TextView
android:id="#+id/txtTitle"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="true"
android:layout_marginBottom="5dp"
android:layout_marginTop="5dp"
android:gravity="center_vertical"
android:textColor="#000000"
android:textSize="22dp"
android:textStyle="bold" />
</LinearLayout>
listview is work properly, but what I want is when I click on menu Bantul it will go to BantulActivity as well as Wonosari and others. Can I implement my project like that? Or maybe any suggestion for my project?
add this in CuacaNowActivity.java
listViewKab.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> a, View v, int position,
long id) {
Intent intent = new Intent(CurrentActivity.this, TargetActivity.class);
startActivity(intent);
}
});
EDIT
First add item in res/menu/main.xml file to show in menu i am adding settings here
ex:
main.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:id="#+id/menu_settings"
android:orderInCategory="100"
android:showAsAction="never"
android:title="#string/menu_settings"/>
</menu>
then in your activity code:
//it will show the menu
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
//it will open the new activity (Settings in my case) when selected
#Override
public boolean onOptionsItemSelected(MenuItem item) {
boolean ret;
try {
if (item.getItemId() == R.id.menu_settings) {
// Handle Settings
Intent intent = new Intent(CurrentActivity.this, Settings.class);
startActivity(intent);
ret = true;
} catch (Exception e) {
}
ret = super.onOptionsItemSelected(item);
return ret;
}
For ListView , onClickListener will not work, you need to implement OnItemClickListener
#Override
public void onItemClick(AdapterView<?> arg0, View view, int position, long arg3)
{
// Perform operations based on the position.
}
Use On Item Click listner:
Try this in onCreate() of CuacaNowActivity
listViewKab.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
Intent in=new Intent(CuacaNowActivity.this,DetailActivity.class);
startActivity(in)
}
});

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