I've got a list fragment with a custom adapter, like this:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
CustomArrayAdapter adapt = new CustomArrayAdapter(getActivity(), DummyContent.ITEMS);
setListAdapter(adapt);
}
The problem is that I want to set a view in case of no items in my list. How I could do it? My java class is extending ListFragment. Thank you!
If you are using custom layout in your ListFragment then you can just create a view inside your xml file with this id(layout taken from the docs):
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="8dp"
android:paddingRight="8dp">
<ListView android:id="#id/android:list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00FF00"
android:layout_weight="1"
android:drawSelectorOnTop="false"/>
<TextView android:id="#id/android:empty"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FF0000"
android:text="No data"/>
</LinearLayout>
There is also a helper method in ListFragment called setEmptyText that will display the text when your listview is empty.
I've finally solved my problem in other way. In the class "EsameListActivity":
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// If there are items in the list
if(DummyContent.ITEMS.size() != 0)
// Show the lsit
setContentView(R.layout.activity_esame_list);
else
// Show a view with a message error
setContentView(R.layout.activity_empty_list);
}
So it solves my problem!
Related
I have created listview using ListActivity
I want to add another view below that list.So how can I do that?
here are 2 files spacelist.xml and homescreen.java using which I have created list.
spacelist.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="70dp"
android:background="#drawable/background"
android:layout_marginBottom="10dp">
<ImageView
android:id="#+id/icon"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_marginLeft="4dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:src="#drawable/ic_launcher" >
</ImageView>
<TextView
android:id="#+id/label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:text="#+id/label"
android:textSize="20dp" >
</TextView>
</LinearLayout>
homeScreen.java-
public class homeScreen extends ListActivity{
String list[]={"My Ideas","Space1","Space2","All Notes","Create New Space"};
ListView spaces;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
//To display as a list
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
R.layout.spacelist, R.id.label, list);
setListAdapter(adapter);
}
}
Now suppose i want to add another view below list.How should I do?
It really depends on what you want to do with that view: always visible at the bottom of the view over the list? or is it fine with you to show that view at the bottom of the list?
First option, you could use an Activity (not ListActivity) and do whatever you want in your layout.
Second option, you can set a footer for your listview or you can have a +1 item in your listview and that item would be your view. Of course you have to manage different type of view in your adapter so it's better to set a footer.
I know that there has been simialr questions but I can't make it work even though I look at those. The error message is:
java.lang.RuntimeException: Your content must have a ListView whose id
attribute is 'android.R.id.list'
. I have tried to change the id to list. In another. This what the code looks like:
public class committeeFragment extends SherlockListFragment {
private CommitteeAdapter adapter;
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
adapter = new CommitteeAdapter(getActivity().getApplicationContext());
setListAdapter(adapter);
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
return inflater.inflate(R.layout.fragment_committee, container, false);
}
public void
refreshList() {
adapter.updateDataSet();
adapter.notifyDataSetChanged();
}
}
It's using the following adapter:
public class CommitteeAdapter extends BaseAdapter {
private
ArrayList<StudentCommittee> committeeList;
private Context context;
public CommitteeAdapter(Context context) {
this.context = context;
CommitteeDatabaseAdapter dbAdapter = new CommitteeDatabaseAdapter(context);
committeeList = dbAdapter.readAllCommittees();
}
public void updateDataSet() {
CommitteeDatabaseAdapter dbAdapter = new CommitteeDatabaseAdapter(context);
committeeList = dbAdapter.readAllCommittees();
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
StudentCommittee committee = committeeList.get(position);
View v = vi.inflate(R.layout.list_item_committee, null);
TextView sectionName = (TextView) v.findViewById(R.id.committee_namn);
sectionName.setText(committee.getName());
return v;
}
#Override
public int getCount() {
return committeeList.size();
}
#Override
public StudentCommittee getItem(int position) {
return committeeList.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
}
Here is the xml-file that specifies the list(fragment_committee):
<?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="vertical"
android:tag="#string/tag_fragment_committee"
android:background="#color/white" >
<TextView
style="#style/AppsolutText.Headline"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Festerier" />
<View
android:layout_width="fill_parent"
android:layout_height="2dp"
android:background="#drawable/divider_sliding_menu_item"/>
<ListView
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
style="#style/AppsolutText.Normal"
android:id="#android:id/empty"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Uppdatera för att se en lista över festerier och fadderier. Kräver internetanslutning."/>
</LinearLayout>
Here is the xml for the list item:
<?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/committee_symbol"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0"
android:paddingBottom="10dp"
android:paddingRight="10dp"
android:paddingTop="10dp" />
<TextView
android:id="#+id/committee_namn"
style="#style/AppsolutText.ListHeader"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1" />
</LinearLayout>
I hope that you can figure out what's wrong. I have another listview that has the same id (list) in another xml-file within the project. I don't know if that's a problem. Please help me solve the problem.
The problem is here :
android:id="#+id/list"
you are adding a new id for your ListView but ListFragment needs a default Android ListView Id
change your ListView Id to :
<ListView
android:id="#id/android:list"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
Change your ListView in XML to have the following id:
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
It's a requirement of using ListFragment/SherlockListFragment
http://developer.android.com/reference/android/app/ListFragment.html
ListFragment has a default layout that consists of a single list view. However, if you desire, you can customize the fragment layout by returning your own view hierarchy from onCreateView(LayoutInflater, ViewGroup, Bundle). To do this, your view hierarchy must contain a ListView object with the id "#android:id/list" (or list if it's in code)
You can try to clean your project. If any xml releted error have , you can find it. Then you can change your list id . Find the list id are exist into your gen folder R.java class.
I decided to stop using actionbarsherlock and use the support libraries instead to get action bar in Android 2.1 and above. After doing this, i got the "java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'". What i did to remedy this problem was
to read this http://developer.android.com/reference/android/app/ListFragment.html#q=fragment
then change my fragment layout file from
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/item_detail"
style="?android:attr/textAppearanceLarge"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp"
android:textIsSelectable="true"
tools:context=".ItemDetailFragment" />
to
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="8dp"
android:paddingRight="8dp"
tools:context=".ItemDetailFragment">
<ListView android:id="#id/android:list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00FF00"
android:layout_weight="1"
android:drawSelectorOnTop="false"/>
<TextView android:id="#+id/item_detail"
style="?android:attr/textAppearanceLarge"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="16dp"
android:textIsSelectable="true"/>
<TextView android:id="#id/android:empty"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FF0000"
android:text="No data"/>
... and voila, the RunTimeException with missing android.R.id.list was gone! Of course, i need to edit my new layout and fix it properly, but the key issue here was that i had overridden the fragment layout in its onCreateView method. ActionBarSherlock DID NOT have a problem with this, but with the Android support library, if u do this, you MUST have a ListView in your XML Layout, with the android:id="#id/android:list" as stated in the info linked to above.
Hope this helps (coming from a total newb in Android app dev)!
i want to add data into the listview when pressing the button.
but it is not getting updated pressing the button dont know how it is not getting worked.
Please help me.
here is the code below
#SuppressLint("NewApi")
public class Messanger extends Activity {
ArrayAdapter<String> adapter;
ListView output;
EditText box;
String msg[];
Button btn;
int counter=0;
ArrayList<String> listItems;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_messanger);
output=(ListView)findViewById(R.id.textOutput);
box=(EditText)findViewById(R.id.textInput);
listItems = new ArrayList<String>();
adapter = new ArrayAdapter<String> (Messanger.this,android.R.layout.simple_list_item_1, android.R.id.text1, listItems);
output.setAdapter(adapter);
btn=(Button)findViewById(R.id.btnSend);
btn.setOnClickListener(new OnClickListener()
{
public void onClick(View arg0) {
// TODO Auto-generated method stub
Toast.makeText(Messanger.this, "in event", Toast.LENGTH_LONG).show();
sendMessage(box.getText().toString());
//stItems.notifyAll();
}
});
}
public void sendMessage(String message)
{
listItems.add("me: "+message);
adapter.addAll(listItems);
adapter.notifyDataSetChanged();
}
}
And my Layout looks like this
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="10" >
<ListView
android:id="#+id/textOutput"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingLeft="5dp"
android:paddingRight="5dp"
android:paddingTop="5dp" />
</ScrollView>
<LinearLayout
android:id="#+id/linearLayout1"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="100"
android:paddingLeft="5dp"
android:paddingRight="5dp"
android:paddingBottom="5dp"
android:baselineAligned="true">
<EditText android:layout_weight="1" android:id="#+id/textInput"
android:layout_height="45dp" android:layout_width="fill_parent">
<requestFocus></requestFocus>
</EditText>
<Button android:layout_weight="1" android:text="Send"
android:layout_height="45dp" android:layout_width="125dp"
android:id="#+id/btnSend"></Button>
</LinearLayout>
</LinearLayout>
thanks in advance
Not sure why is isn't updating. Code looks OK to me. You might try clearing the array before calling addAll() because if you don't you will end up with duplicates in your list (which probably isn't what you want. Should look like this:
listItems.add("me: "+message);
adapter.clear();
adapter.addAll(listItems);
adapter.notifyDataSetChanged();
The reason it isn't updating is probably somewhere else though. Post your layout, maybe the problem is in there.
EDIT: After seeing the layout:
Yep, the problem is in your layout. You don't put a ListView inside a ScrollView. A ListView already knows how to scroll. Get rid of the surrounding ScrollView and you should be good.
Notice that you always add the same items by calling
adapter.addAll(listItems);
Regardless,
Try debugging you getView() function in the adapter.
I have a ListView inside a Linearlayout.
The listview has a custom cursoradapter.
Everything works fine, except the ListView does not scroll.
Any suggestion more than welcome!! Thanks. maurizio
Here is the XML of the MainActivity
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<Button
android:id="#+id/buttonAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:text="Aggiungi" />
<ListView
android:id="#+id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
Here is the relevant piece of java code.
public class MainActivity extends Activity {
private DatabaseHelper db=null;
private Cursor tabellaCursor=null;
private ListAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
int[] to = new int[] {R.id.name_entry};
db = new DatabaseHelper(this);
tabellaCursor=db.getWritableDatabase().rawQuery("SELECT _id, colonna1, colo nna2, colonna3 FROM tabella ORDER BY _id", null);
ListAdapter adapter=new MyAdapter(this, R.layout.list_example_entry, tabe llaCursor, new String[]{"colonna1"},to);
ListView lt = (ListView)findViewById(R.id.list);
lt.setAdapter(adapter);
Button addbtn=(Button)findViewById(R.id.buttonAdd);
addbtn.setOnClickListener(new OnClickListener()
{public void onClick(View v){add(); }
});
}
Your ListViews Layout param is "wrap_content". it will expand as you add new items to litview. therefore it won't scroll. If you set it to "match_parent" it will sure start scrolling.And dont forget that a view does scroll only if its contents(childs view what ever)
size is bigger than it.
Add more list items that exceeds height. then you can scroll.
Please use below code, it will solve your problem.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<Button
android:id="#+id/buttonAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal"
android:text="Aggiungi" />
<ListView
android:id="#+id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="#+id/buttonAdd"/>
</RelativeLayout>
Let's say I need to take names of movies the person likes. I don't know how many he likes so I want to present him with just one text field. He can click a button and add more fields to fill. I can use ScrollView of course but should I think about using a ListView? If so, I can't seem to understand how. Please help
Better, add edittext dynamically inside scrollview, onclick of a button.
try this:
public class TestingActivity extends ListActivity {
/** Called when the activity is first created. */
EditText value;
Button insert;
ArrayList<String> data=new ArrayList<String>();
/** Called when the activity is first created. */
#SuppressWarnings("unchecked")
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
insert = (Button) findViewById(R.id.button2);
value=(EditText)findViewById(R.id.value);
insert.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
data.add(value.getText().toString());
getListView().setAdapter(new ArrayAdapter(getApplicationContext(), android.R.layout.simple_list_item_1, data));
}
});
getListView().setAdapter(new ArrayAdapter(getApplicationContext(), android.R.layout.simple_list_item_1, data));
}
}
xml is:
<?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:orientation="vertical" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<EditText
android:id="#+id/value"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
<Button
android:id="#+id/button2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="insert" />
</LinearLayout>
<ListView
android:id="#android:id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scrollingCache="false" >
</ListView>
</LinearLayout>
You could implement an own BaseAdapter that uses EditText-Views to let people enter data.
Here's how to implement a good Adapter.
If the Button is getting clicked you can just add another entry in a List that is used to add another View to your Adapter.