Android custom xml file to the value of the assignment and get Spinner drop-down box to select the drop-down

Scenes

Achieve results as follows

 

 

Note:

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achieve

To the LinearLayout layout, and by android: orientation = "vertical"> vertical layout setting, and then add the id attribute.

Then New arrays.xml, an array of resources in the file under res values, used to store the contents of the drop-down box options

 

 

arrays.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string-array name="ctype">
        <item>全部</item>
        <item>公众号</item>
        <item>霸道</item>
        <item>的</item>
        <item>程序猿</item>
        <item>博客</item>
        <item>霸道</item>
        <item>流氓</item>
        <item>气质</item>
    </string-array>
</resources>

 

只要通过name属性赋值为ctype，后续被引用。

然后再回到activity_spinner.xml中，通过

android:entries="@array/ctype"

 

为下拉框设置选项数组内容。

activity_spinner.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    tools:context=".SpinnerActivity">

    <Spinner
        android:id="@+id/spinnner"
        android:entries="@array/ctype"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

</LinearLayout>

 

然后来到activity,通过id获取spinner，然后设置其选项被选中的事件监听器，获取选中值的内容并输出

package com.badao.relativelayouttest;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Spinner;
import android.widget.Toast;

public class SpinnerActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_spinner);
        Spinner spinner = (Spinner) findViewById(R.id.spinnner);
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                String result = parent.getItemAtPosition(position).toString();
                Toast.makeText(SpinnerActivity.this,result,Toast.LENGTH_SHORT).show();
            }

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

            }
        });
    }
}