Develop Reference

Nothing happens when I click on the Spinner item

I have fetched data from the server from the category class.The getcategories method return the List of String containing spinner items. When I click on the spinner item. Nothing happens. Is there any mistake in my code. Please help.
This is my java code.
public void fetchPropertyType(){
category = new Category(); //Spinner Item model
//categories is a array list of String which contains the items of spinner
categories = category.getCategories(AddPropertyActivity.this);
//Property Type Spinner Adapter
propertyTypeSpinner = (Spinner) findViewById(R.id.property_type_spinner);
Log.e("Test", "Just a test message");
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);
// Drop down layout style - list view with radio button
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
propertyTypeSpinner.setAdapter(dataAdapter);
propertyTypeSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(parent.getContext(),
"OnItemSelectedListener : " + parent.getItemAtPosition(position).toString(),
Toast.LENGTH_SHORT).show();
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
Log.e("Test", "Nothing selected on spinner activity");
}
});
}
This is my layout
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_weight="1">
<TextView
android:id="#+id/spinner_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginRight="50dp"
android:gravity="center"
android:text="Property Type"
android:textAlignment="textEnd"/>
<Spinner
android:id="#+id/property_type_spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:spinnerMode="dropdown"/>
</RelativeLayout>

You just should do this.
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:background="#drawable/border">
<TextView
android:id="#+id/spinner_text"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginRight="50dp"
android:gravity="center"
android:text="Property Type"
android:textAlignment="textEnd"/>
<Spinner
android:id="#+id/property_type_spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:spinnerMode="dropdown"/>
</RelativeLayout>
In the Spinner
Change
android:layout_height="match_parent"
To
android:layout_height="wrap_content"
Because you use android:layout_height="match_parent",so you can't see your list item.And nothing happens.

As you are using
<Spinner
android:id="#+id/property_type_spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:spinnerMode="dropdown"/>
Which wraps the height of spinner so try to give custom height to it so that i t will be clickable
I did this
<Spinner
android:id="#+id/property_type_spinner"
android:layout_width="match_parent"
android:layout_height="50dp"
android:spinnerMode="dropdown"/>
and keep your text view height wrap_content as
<TextView
android:id="#+id/spinner_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginRight="50dp"
android:gravity="center"
android:text="Property Type"/>

How do I populate the contents from EditText in ListView?

I have a layout file in which I have defined a ListView and another layout file in which I have defined the style of the individual list element. OnClick how do I populate my ListView by using the other layout? Or is it even possible to do so?
This is my ListView
<ListView
android:id="#+id/chat_list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="80dp"
>
</ListView>
<RelativeLayout
android:id="#+id/form"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:orientation="vertical">
</RelativeLayout>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textMultiLine"
android:ems="10"
android:id="#+id/chat"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_toLeftOf="#+id/send_button"/>
<Button
android:layout_width="80dp"
android:layout_height="80dp"
android:background="#drawable/icons_chat"
android:height="20dp"
android:width="20dp"
android:id="#+id/send_button"
android:onClick="sendChat"
android:layout_alignBottom="#+id/chat"
android:layout_alignParentRight="true"
/>
This is my other layout
<EditText
android:id="#+id/user_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<EditText
android:id="#+id/chat_message"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
OnClick I want to getText from the EditText in the first layout and update the ListView using the style in the second layout. How can I do that?

I think that one way to do it is with an ArrayAdapter which will adapt your Collection (which you want to use) to your items in your layout ListView for your case. For example
public class YourActivity extends Activity {
private ListView listView;
public void onCreate(Bundle saveInstanceState) {
setContentView(R.layout.your_layout);
listView= (ListView) findViewById(R.id.you_list_id);
//Here you can set values from your edit texts
ArrayList<String> yourArrayList = new ArrayList<>();
yourArrayList.add("someTextFromYourEditTexts");
yourArrayList.add("someTextFromYourEditTexts");
//Create your ArrayAdapter with your already populate array list
ArrayAdapter<String> yourArrayAdapter = new ArrayAdapter<String>(
this,
android.R.layout.simple_list_item_1,
yourArrayList );
//And when your adapter is create set it to your list view
listView.setAdapter(yourArrayAdapter);
}
}

creating scrollable spinner to show some items

i used spinner to show items but it only works when the items are less than 5 items, and when i want to show 10 items this error happens : unfortunately stopped :( how can i use scrollable spinner to show all items in the spinner
here is:
spinner.xml :and main
<?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"
android:background="#drawable/shw"
android:orientation="vertical" >
<TextView
android:id="#+id/txt3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="which"
android:textColor="#ffffff" />
<LinearLayout
android:id="#+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="#+id/bt1help2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/Spinner01"
android:layout_marginRight="100dp"
android:layout_toLeftOf="#+id/txt3"
android:text="ok"
android:textColor="#ffffff" />
<Button
android:id="#+id/btn2help2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="no"
android:textColor="#ffffff" />
</LinearLayout>
<Spinner
android:id="#+id/Spinner01"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:verticalScrollbarPosition="left"
android:scrollbarThumbVertical="#drawable/scrollbar_style"
android:layout_below="#+id/linearLayout1"
android:layout_marginTop="22dp" />
final Dialog dl = new Dialog(Main.this);
dl.setContentView(R.layout.spinner);
dl.setTitle("show");
TextView txt2 = (TextView) dl.findViewById(R.id.txt2);
TextView txt3 = (TextView) dl.findViewById(R.id.txt3);
///تنظیم متن
txt2.setText(" which one do you want to show?");
Button btn1help2 = (Button) dl.findViewById(R.id.bt1help2);
btn1help2.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
String array_spinner[];
array_spinner=new String[5];
array_spinner[0]="letter_one";
array_spinner[1]="letter_2";
array_spinner[2]="letter_3";
array_spinner[3]="letter_4";
array_spinner[4]="letter_5";
array_spinner[5]="letter_6";
array_spinner[6]="letter_7";
array_spinner[7]="letter_8";
array_spinner[8]="letter_9";
array_spinner[9]="letter_10";
Spinner s = (Spinner) dl.findViewById(R.id.Spinner01);
ArrayAdapter adapter = new ArrayAdapter(getApplicationContext(),android.R.layout.simple_spinner_item, array_spinner);
s.setAdapter(adapter);
how can change it to scrollable spinner?
Thanks for your answers

You can use ScrollView. Put your RelativeLayout inside ScrollView because it just can have one child.
<ScrollView>
<RelativeLayout>
.... other views
</RelativeLayout>
</ScrollView>

your problem is this array_spinner=new String[5]; you set size of 5 items but you put 10 so, you initialize the array this String array_spinner[]; array_spinner=new String[10];

Android ListView creates the views but doesn't display them

I am having problems with ListView on android. I have an Activity with an EditText view and a button. The idea is user should enter some info in the EditText field, touch the Search button which retrieves a list from a web service that it is displayed in the same activity below the EditText and the Button. Everything fine, I got the data from Internet but items weren't displaying. I was using the notifyDataSetChanged(). After a couple of hours with no success, I decided trying to put some items manually and it turns out that again nothing was displayed, hence I think I am doing something wrong when I am trying to set the listview and the adapter. So here is the code..
the xml of the activity activity_search.xml
<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" >
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="5dp">
<EditText
android:id="#+id/edit_search"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="5"
android:inputType="text"
android:hint="Enter info"
android:ems="10" >
<requestFocus />
</EditText>
<Button
android:id="#+id/button_search"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#android:drawable/ic_menu_search"
android:contentDescription="Search"
android:ems="10" />
</LinearLayout>
<ListView
android:id="#+id/listview_items"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawSelectorOnTop="false" />
The XML of the item row.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_margin="5dp">
<TextView
android:id="#+id/row_code"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/Common_TextContent"
android:textAppearance="#android:style/TextAppearance.Holo.Medium" />
<TextView
android:id="#+id/row_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="#string/Common_TextContent"
android:textAppearance="#android:style/TextAppearance.Holo.Small" /></LinearLayout>
the custom Adapter:
public class ItemsListAdapter extends ArrayAdapter<ItemsList> {
private int[] colors = new int[] { 0x30ffffff, 0x30808080 };
public AssetListAdapter(Context context,
List<ItemsList> itemsList) {
super(context, 0, itemsList);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = LayoutInflater.from(getContext()).inflate(R.layout.row, null);
}
convertView.setBackgroundColor(colors[position % colors.length]);
TextView code = (TextView) convertView.findViewById(R.id.row_code);
code.setText(getItem(position).getCode());
TextView name = (TextView) convertView.findViewById(R.id.row_name);
name.setText(getItem(position).getName());
return convertView;
}
and the onCreate method on the Activity
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
_listView = (ListView) findViewById(R.id.listview_items);
_listItems = new ArrayList<ItemsList>();
_listItems.add(new ItemsList ("cosa1", "cosa1", "cosa1", "cosa1"));
_listItems.add(new ItemsList ("cosa2", "cosa2", "cosa2", "cosa2"));
_listItems.add(new ItemsList ("cosa3", "cosa3", "cosa3", "cosa3"));
_adapter = new ItemsListAdapter(this, _listItems);
_listView.setAdapter(_adapter);
}
The ItemsList is just an Object with 4 strings with all the getters implemented.
When I debug in the getView method of the Adapter, the view (convertView) is created and it has the right information. It is just that is not showing those in the screen. What am I doing wrong?
Thanks...

Your second LinearLayout has a height of match_parent. Try wrap_content instead.
<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" >
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp">

AutoCompleteTextView causes items in ListView to disappear

I'm doing the Extra Credit section of the Adding a List section in Android Tutorials. I tried populating the AutoCompleteTextView (ACTV) with the items contained in the ArrayAdapter, but if the addr field has characters in it above the threshold limit, the list doesn't show any items. Here is the code:
public class MyActivity extends Activity
{
List<Restaurant> model = new ArrayList<Restaurant>();
ArrayAdapter<Restaurant> adapter = null;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button save = (Button)findViewById(R.id.save);
save.setOnClickListener(onSave);
ListView list = (ListView)findViewById(R.id.restaurants);
adapter = new ArrayAdapter<Restaurant>(this,
android.R.layout.simple_list_item_1,
model);
list.setAdapter(adapter);
AutoCompleteTextView textView = (AutoCompleteTextView)findViewById(R.id.addr);
textView.setAdapter(adapter);
}
private View.OnClickListener onSave= new View.OnClickListener(){
...
};
}
And the XML...
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent">
<TableLayout
android:id="#+id/details"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:stretchColumns="1"
android:shrinkColumns="1"
android:layout_alignParentBottom="true"
>
<TableRow>
<TextView android:text="Name:"/>
<EditText android:id="#+id/name"/>
</TableRow>
<TableRow>
<TextView android:text="Address:"/>
<AutoCompleteTextView android:id="#+id/addr"
android:completionThreshold="5"
/>
</TableRow>
<TableRow>
<TextView android:text="Type:"/>
<RadioGroup android:id="#+id/types">
<RadioButton android:id="#+id/take_out"
android:text="Take Out"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:checked="true"
/>
<RadioButton android:id="#+id/sit_down"
android:text="Sit Down"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<RadioButton android:id="#+id/delivery"
android:text="Delivery"
android:layout_height="wrap_content"
android:layout_width="wrap_content"/>
</RadioGroup>
</TableRow>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/save"
android:text="Save"/>
</TableLayout>
<ListView android:id="#+id/restaurants"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_above="#id/details"/>
</RelativeLayout>
Changing the completionThreshold changes the number of characters I can enter before the items in the List disappear.
Thanks for the help

You are attempting to use the same adapter for both the ListView and the AutoCompleteTextView. That is not a good idea. Please use separate adapters. You might even want a separate layout for the adapter used with the AutoCompleteTextView (e.g., android.R.layout.simple_dropdown_item_1line, as I used in this sample project).