SPINNER

Spinners provide a quick way to select one value from a set. In the default state, a spinner shows its currently selected value. Touching the spinner displays a dropdown menu with all other available values, from which the user can select a new one.

or

The spinner is nothing but a label with a dropdown list often seen on web page forms. When the user clicks this label, the dropdown list appears, and this allows the users to make a selection based on this list. The “ItemClick” event is triggered when the user makes a selection.

It’s effective in input control and makes the developer’s work easier and reduces overhead of complex designs. The most important feature of the spinner is that it prevents excessive space utilization, which otherwise would be required to list items.

Generally, a Spinner Adapter is required to pass the values to the spinner. A Spinner Adapter acts as a bridge between the spinner and the data to be listed. It lists the values in the form of a drop down list.

Program

activity_main.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:background="#12E7FF"
    >
    <Spinner
        android:id="@+id/spinner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
    />
</LinearLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity {



    TextView textView1;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);



       textView1=(TextView)findViewById(R.id.tv1);



        Spinner spinner = (Spinner) findViewById(R.id.spinner);

// Create an ArrayAdapter using the string array and a default spinner layout

        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,

                R.array.planets_array, android.R.layout.simple_spinner_item);

// Specify the layout to use when the list of choices appears

        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

// Apply the adapter to the spinner

        spinner.setAdapter(adapter);





    }

}

and place this code in res/value.string.xml

<resources>

    <string name="app_name">TestOne</string>

    <string name="hello">Hello</string>



    <string-array name="planets_array">

        <item>Mercury</item>

        <item>Venus</item>

        <item>Earth</item>

        <item>Mars</item>

        <item>Jupiter</item>

        <item>Saturn</item>

        <item>Uranus</item>

        <item>Neptune</item>

    </string-array>





</resources>

spinner mode

It defines display mode for spinner options. This Property has two options: Dialog mode and DropDown mode. Dialog mode uses a dialog window for selecting spinner options and drop-down mode uses drop-down anchored to the Spinner for selecting spinner options.

Syntax -

android:spinnerMode="dialog"

Dropdown Width

Defines the width of the dropdown list of spinner using setDropDownWidth() method.

Syntax - android:dropDownWidth="200dp"

Popup Background

Background drawable to use for the dropdown

It may be image or color.

syntax -

android:popupBackground="@drawable/image1"

OnItemselectedListner

activity_main.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:background="#12E7FF"

    >

    <Spinner

        android:id="@+id/spinner"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layerType="hardware"

    />

    <TextView

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:id="@+id/tv1"

        android:textSize="30dp"

        android:hint="Hint"

        />



</LinearLayout>

MainActivity.java

public class MainActivity extends Activity {



    TextView textView1;

    Spinner spinner;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);



       textView1=(TextView)findViewById(R.id.tv1);



        spinner = (Spinner) findViewById(R.id.spinner);



        List<String> list1=new ArrayList<String>();

        list1.add("Android");

        list1.add("IOS");

        list1.add("Window");

        list1.add("Blackberry");



        ArrayAdapter<String> arrayAdapter1=new ArrayAdapter<String>(this,R.layout.support_simple_spinner_dropdown_item,list1);



        arrayAdapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);





        spinner.setAdapter(arrayAdapter1);



        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

            @Override

            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

                String str=spinner.getSelectedItem().toString();

                textView1.setText(str);

            }



            @Override

            public void onNothingSelected(AdapterView<?> parent) {



            }

        });

    }







}

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