How to create a drop down list?
Spinner xml:
<Spinner
android:id="@+id/spinner"
android:layout_width="wrap_content"
android:layout_height="match_parent" />
java:
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener{
private Spinner spinner;
private static final String[] paths = {"item 1", "item 2", "item 3"};
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
spinner = (Spinner)findViewById(R.id.spinner);
ArrayAdapter<String>adapter = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item,paths);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(this);
}
@Override
public void onItemSelected(AdapterView<?> parent, View v, int position, long id) {
switch (position) {
case 0:
// Whatever you want to happen when the first item gets selected
break;
case 1:
// Whatever you want to happen when the second item gets selected
break;
case 2:
// Whatever you want to happen when the thrid item gets selected
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
}
Here is the code for it.
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Spinner
android:id="@+id/static_spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="20dp"
android:layout_marginTop="20dp" />
<Spinner
android:id="@+id/dynamic_spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">Ahotbrew.com - Dropdown</string>
<string-array name="brew_array">
<item>Cappuccino</item>
<item>Espresso</item>
<item>Mocha</item>
<item>Caffè Americano</item>
<item>Cafe Zorro</item>
</string-array>
MainActivity
Spinner staticSpinner = (Spinner) findViewById(R.id.static_spinner);
// Create an ArrayAdapter using the string array and a default spinner
ArrayAdapter<CharSequence> staticAdapter = ArrayAdapter
.createFromResource(this, R.array.brew_array,
android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
staticAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
staticSpinner.setAdapter(staticAdapter);
Spinner dynamicSpinner = (Spinner) findViewById(R.id.dynamic_spinner);
String[] items = new String[] { "Chai Latte", "Green Tea", "Black Tea" };
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, items);
dynamicSpinner.setAdapter(adapter);
dynamicSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
Log.v("item", (String) parent.getItemAtPosition(position));
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
});
This example is from http://www.ahotbrew.com/android-dropdown-spinner-example/
This code is workig fine for me, hope it will help you too.
item.xml
<?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="wrap_content"
android:orientation="vertical"
android:padding="1dip" >
<TextView
android:id="@+id/spinnerItem"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="2dp"
android:textSize="12sp" >
</TextView>
</RelativeLayout>
details.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginBottom="20dp"
android:background="#FF00FF">
<Spinner
android:id="@+id/dropStatus"
android:layout_width="250dp"
android:layout_height="30dp"
android:layout_marginBottom="7dp"
android:drawSelectorOnTop="true"/>
</LinearLayout>
Adapter class:
import java.util.ArrayList;
import android.content.Context;
import android.content.res.Resources;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
public class StatusAdapter extends ArrayAdapter<StatusBean> {
private Context context;
private ArrayList<StatusBean> statuses;
public Resources res;
StatusBean currRowVal = null;
LayoutInflater inflater;
public StatusAdapter(Context context,
int textViewResourceId, ArrayList<StatusBean> statuses,
Resources resLocal) {
super(context, textViewResourceId, statuses);
this.context = context;
this.statuses = statuses;
this.res = resLocal;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
return getCustomView(position, convertView, parent);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
return getCustomView(position, convertView, parent);
}
public View getCustomView(int position, View convertView, ViewGroup parent) {
View row = inflater.inflate(R.layout.status_item, parent, false);
currRowVal = null;
currRowVal = (StatusBean) statuses.get(position);
TextView label = (TextView) row.findViewById(R.id.spinnerItem);
if (position == 0) {
label.setText("Please select status");
} else {
label.setText(currRowVal.getStatus());
}
return row;
}
}
StatusBean class:
public class StatusBean {
private String status;
private String statusCode;
public StatusBean() {
}
public StatusBean(String status,
String statusCode) {
this.status = status;
this.statusCode = statusCode;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public String getStatusCode() {
return statusCode;
}
public void setStatusCode(String statusCode) {
this.statusCode = statusCode;
}
}
Activity class :
Inside onCreate methos:
static ArrayList<StatusBean> STATUS_LIST = new ArrayList<StatusBean>();
for(int i=0;i<=10;i++) {
STATUS_LIST.add(new StatusBean(“Status ”+i, “Stattus ”+i));
}
final Spinner dropStatus = (Spinner)findViewById(R.id.dropStatus);
Resources res = getResources();
StatusAdapter adapter = new StatusAdapter(this, R.layout.item, SessionData. STATUS_LIST, res);
dropStatus.setAdapter(adapter);
simple / elegant / how I do it:
Preview:
XML:
<Spinner
android:id="@+id/spinner1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:drawable/btn_dropdown"
android:spinnerMode="dropdown"/>
spinnerMode set to dropdown is androids way to make a dropdown. (https://developer.android.com/reference/android/widget/Spinner#attr_android:spinnerMode)
Java:
//get the spinner from the xml.
Spinner dropdown = findViewById(R.id.spinner1);
//create a list of items for the spinner.
String[] items = new String[]{"1", "2", "three"};
//create an adapter to describe how the items are displayed, adapters are used in several places in android.
//There are multiple variations of this, but this is the basic variant.
ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, items);
//set the spinners adapter to the previously created one.
dropdown.setAdapter(adapter);
Documentation:
This is the basics but there is more to be self taught with experimentation. https://developer.android.com/guide/topics/ui/controls/spinner.html
- You can use a setOnItemSelectedListener with this. (https://developer.android.com/guide/topics/ui/controls/spinner.html#SelectListener)
- You can add a strings list from xml. (https://developer.android.com/guide/topics/ui/controls/spinner.html#Populate)
- There is an appCompat version of this view. (https://developer.android.com/reference/androidx/appcompat/widget/AppCompatSpinner)