Android 开发 列表选择框实现

将列表选择框的内容以数组形式写进xml，存在value中

    
        ch1
        ch2
        ch3
        ch4
        ch5
    

在layout中设置Spinner

在MainActivity中通过id找到组件，并设置监听事件

package com.p3_3;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.*;

public class MainActivity extends Activity {
    /**
     * Called when the activity is first created.
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Spinner spinner = (Spinner) findViewById(R.id.ch);
        spinner.getSelectedItem();
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView adapterView, View view, int i, long l) {
                String result = adapterView.getItemAtPosition(i).toString();
                Toast.makeText(MainActivity.this,result,Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onNothingSelected(AdapterView adapterView) {

            }
        });
    }
}