Android UI control series: Spinner (drop-down list)

When registering an account on a website, the website will ask us to provide gender, birthday, city and other information. For convenience, a drop-down list is provided for us to choose. This function is also available on Android. This is Spinner drop-down list

While coding, we first need to time the Spinner component in the layout, then connect the optional content to the drop-down list through the ArrayAdapter, and finally to get the option selected by the user, we need to design an event listener setOnItemSelectedListener and implement onItemSelected to obtain the content selected by the user, and finally set the current display item through the setVisibility method

SpinnerTest.java

package org.hualang.Spinner;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class SpinnerTest extends Activity {
    /** Called when the activity is first created. */
        private static final String[] citys={"杭州","北京","成都","大连","深圳","南京"};
        private TextView text;
        private Spinner spinner;
        private ArrayAdapter<String> adapter;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        text=(TextView)findViewById(R.id.text);
        spinner=(Spinner)findViewById(R.id.spinner);

        //将可选内容与ArrayAdapter连接
        adapter=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,citys);
        //设置下拉列表风格
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        //将adapter添加到spinner中
        spinner.setAdapter(adapter);
        //添加Spinner事件监听
        spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener()
        {

                        @Override
                        public void onItemSelected(AdapterView<?> arg0, View arg1,
                                        int arg2, long arg3) {
                                // TODO Auto-generated method stub
                                text.setText("你所在的城市是："+citys[arg2]);
                                //设置显示当前选择的项
                                arg0.setVisibility(View.VISIBLE);
                        }

                        @Override
                        public void onNothingSelected(AdapterView<?> arg0) {
                                // TODO Auto-generated method stub

                        }

        });
    }
}

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="fill_parent"  
    android:layout_height="fill_parent"  
    >  
<TextView  
        android:id="@+id/text"  
    android:layout_width="fill_parent"  
    android:layout_height="wrap_content"  
    android:text="您所在的城市"  
    />  
<Spinner  
        android:id="@+id/spinner"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_centerHorizontal="true"  
/>  
</LinearLayout>

Run results:

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