Spinner together

Question

• I have a Spinner who is responsible for the States of Brazil.
• And another Spinner responsible for Capitals of Brazil.
• I need you when you go selected the State another spinner of Cities be unlocked and show your respective Capital which corresponds to your State.

That’s possible?

Answer 1

There are several ways to do this, however I’ll show you a way using the method setOnItemSelectedListener(). This way, I check if the selected item is the first one using position == 0. In the first position there is the phrase Escolha o Estado. If this position is selected, the spinner Cities will remain disabled using setEnabled(false). See below:

Mainactivity.java

libs:

import android.widget.AdapterView;
import android.widget.Spinner;

code:

    final Spinner spinner1 = (Spinner) findViewById(R.id.spinner1);
    final Spinner spinner2 = (Spinner) findViewById(R.id.spinner2);

    spinner1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            if (position == 0)
                spinner2.setEnabled(false);
            else
                spinner2.setEnabled(true);
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });

activity_main.xml

<Spinner
    android:id="@+id/spinner1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:entries="@array/estados"
    android:prompt="@string/estados_prompt" />

<Spinner
    android:id="@+id/spinner2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:entries="@array/cidades"
    android:prompt="@string/cidades_prompt" />

xml string.

<string name="estados_prompt">Escolha o estado</string>
<string-array name="estados">
    <item>Escolha o Estado</item>
    <item>São Paulo</item>
    <item>Rio De Janeiro</item>
    <item>Minas Gerais</item>
</string-array>

<string name="cidades_prompt">Escolha a cidade</string>
<string-array name="cidades">
    <item>Escolha a cidade</item>
    <item>Atibaia</item>
    <item>Petrópolis</item>
    <item>Belo Horizonte</item>
</string-array>

Note: This is a very simple example, because in practice the ideal would be to filter the city according to the State.

For more details on Spinner's, read the documentation.

Answer 2

To enable/disable a view, use the setEnabled method().

Spinner capitais = (Spinner) findViewById(R.id.spinnerCapitais);
capitais.setEnabled(true) // para ativar a view
capitais.setEnabled(false) // para desativar a view