Develop Reference

TextView and ListView in a LinearLayout

I searched for similar questions but didn't get the proper answer, so posting it as a new question.
Can a LinearLayout have two TextViews and one list view? I learn that listview can be used to display array elements only if the class extends ListActivity. The Class in my app extends Activity and uses listView.
I am trying to build an RSS Reader based on IBM tutorial. On running the project I am getting parsed text in both the Text views but ListView is not displaying. I can post the code and Logcat if required.

Linear Layout can have any number of children.
ListActivity is an Activity that Android have added for convenience when dealing with activities comprised of list.
You can use ListView on a regular Activity and just implement an adapter that will populate the list items with data from your model.
Android has some ready-made adapters that can be used for simple use-cases.
of course if you need a more complicated beahviour you can extend them.
Have a look on BaseAdapter, ArrayAdapter and CursorAdapter to get a better understanding of how to use adapters.

You can have a ListView in any activity, using a ListActivity just makes your life easier (usually). See here for details.

You can have a Linear layout with different views and list view inside for example:
?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"
android:background="#drawable/background_new_search_activity_1">
<TextView
android:id="#+id/list_item_amount_text"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<ListView
android:id="#android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:cacheColorHint="#00000000"/>
</LinearLayout>
And yes you can use the ListViewin all the activities, it is not necessary to extend ListActivity

Make sure the orientation of the ListView is set to vertical. Otherwise, it will try to display all items side by side, and those that fall outside the available view area won't be visible.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"> <!-- << orientation setting here -->

Android: what is the best way to show a TextView in case if no item in a ListView?

I need to show a list of items, the items are read from a database, and it is possible there is no item, in this case, I just want to show a TextView saying "there is no item", I think I could implement this by using relative layout, both list and text are in center of parent, they are displayed alternatively, but is there any way better than this?
Thanks!

Adding to Aleadam , Bill Mote
You may call at any time AdapterView.setEmptyView(View v) on an AdapterView object to attach a view you would like to use as the empty view.
The snippet is as follows:
empty = (TextView)findViewById(R.id.empty1);
list = (ListView)findViewById(R.id.list1);
list.setEmptyView(empty);
Make sure you keep the ListView and TextView inside the same parent.
For detailed description please refer this

If you're using a ListActivity, that is the default behavior. If not, then you can set the ListView visibility to GONE and a TextView visibility to VISIBLE.

Aleadam is right. Here's an example XML in support of his answer:
<?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"
<ListView
android:id="#+id/android:list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
<TextView
android:id="#id/android:empty"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:textColor="#drawable/red"
android:gravity="center_vertical|center_horizontal"
android:textStyle="bold"
android:text="#string/error_no_groups"
/>
</LinearLayout>

The first tutorial on the Android developer website explains how to do this:
http://developer.android.com/resources/tutorials/notepad/notepad-ex1.html
(Look under Step 4)
Snippet:
The ListView and TextView can be thought as two alternative views, only one of which will be displayed at once. ListView will be used when there are notes to be shown, while the TextView (which has a default value of "No Notes Yet!" defined as a string resource in res/values/strings.xml) will be displayed if there aren't any notes to display.
The View with the empty id is used automatically when the ListAdapter has no data for the ListView. The ListAdapter knows to look for this name by default. Alternatively, you could change the default empty view by using setEmptyView(View) on the ListView.

Clicking on the entire row of Android ListView

I have Created a ListView and set a background image.Everything goes fine except I am unable to click on the right side of the row of ListView.Can anybody help me this.
Below is the xml file...
<ListView
android:layout_width="wrap_content"
android:id="#+id/JSONListView"
android:layout_height="wrap_content"
android:background="#drawable/listbg"
android:focusable="false"
android:cacheColorHint="#00000000"
android:visibility="visible" >
</ListView>
And I am not using any View.

Use the attribute
android:layout_width="match_parent"
and set click listener for items.

I guess you have created your custom adapter. If so, just go to the getView() method of that custom adapter and on the holder instance of that portion of listitem add a onCLickListener.

Provide more info. XML layout, etc.
Im guessing there is a view there or it is not filling the entire width but difficult to say.
Android ListView Activity

Set, get text and value in listitem view in Android

I have listview collection that show id and name in Android. I following example from this resource site.
But actually that example only display name. I wish similar like checkboxlist in ASP.NET that contain property text and value. So the text to show name and value store id. When user select one item, I could retrieve id by viewtext.
My question is how do I set id and name in same viewtext item? I wish could pass the id to another layout.
I know that possible using multi viewtext then set invisible of viewtext using map. How that could be waste memory.

i would suggest a custom listview. you can google for "custom listview" and will find a bunch of tutorials on that. simply said, it is a listview that has a custom row that you can specify in a xml file.
here is a quite useful tutorial to start with.
here is what i coded, maybe it will help you. note that this is a bit different, because i am not defining a listactivity but a listview widget. but concerning the custom row item, it won't matter.
this will create a listview and specify an adapter for that listview.
CustomListView listview = (CustomListView) findViewById(R.id.list);
ArrayAdapter<String> arrayadapter = new ArrayAdapter<String(getApplicationContext(), R.layout.rowoflistview, R.id.label);
listview.setAdapter(arrayadapter);
my rowoflistview.xml looks like the following. it adds an image and a text to each row of the list. you can of course change it to (mostly) whatever you want.
<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#drawable/rowselector"
>
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/musicicon"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:src="#drawable/musicicon"
android:paddingLeft="3px"
/>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="26px"
android:layout_marginLeft="3px"
android:singleLine="true"
android:ellipsize="end"
android:focusable="false"
/>
</LinearLayout>
as i wanted the listview as a widget in my main activity and not as a fullscreen activity, i had to do it other than you when it comes to event listening and click listening. if you want it a bit easier, be sure to extend the listactivity in your custom listview-activity and override the default methods.
hope that was understandable to get a grip on the topic ;)

Views have an associated tag Object map, which could contain your id http://developer.android.com/reference/android/view/View.html#getTag%28int%29

Is possible to set an listener just for a part of a custom view?

I want to create a custom view (extends View) which contains an image and a text.
Is it possible to set an listener just for image if i use canvas.drawBitmap(imageBitmap, ...) method?
Thank you!

If you want your view just to show an image and a text, why not create a specific layout in your XML file and use setContentView to display the view?
If thats what you were looking for, I think that is the easiest approach. XML example coming soon.
Here is the contents of my personal view to display my main application, just to demonstrate how I can switch view's, your view would be different including a TextView and an ImageView.
dblist.xml inside of res/layout folder.
<?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"
android:background="#FFFFFF">
<ListView android:id="#+id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:textColor="#000000"/>
</LinearLayout>
This contents display my database results onto a Spinner
I can call that view by using:
setContentView(R.layout.dblist);
And if I want to return to my main layout, I can switch the view by calling
setContentView(R.layout.main);
EDIT:
You can manipulate the view you are working with programmatically by using findViewById method. Let's use my dblist.xml file as an example, notice that my ListView has an id of list. So I would call:
ListView myList = (ListView) findViewById(R.id.list);
With corresponds to that layout, so whenever I want to change anything to my XML file, I would reference myList use methods and callbacks to meet my needs.
I hope this helps.