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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="edu.qau.ch03_5_spinner1.MainActivity" >
<Spinner
android:id="@+id/position"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</RelativeLayout>
package edu.qau.ch03_5_spinner1;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
public class MainActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//根据Id获取下拉列表
Spinner spinner = (Spinner) findViewById(R.id.position);
//创建一个下拉列表选项数组
String[] strs = {"CEO", "PM", "PL" };
// 创建一个数组适配器
//有三种方法创建数组适配器
//ArrayAdapter(Context context,int resource,int textViewResId)
//ArrayAdapter(Context context,int textViewResId,T[] objects)
//ArrayAdapter(Context context,textViewResId,list <T> objects)
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_dropdown_item, strs);
// 设置下拉列表的适配器
spinner.setAdapter(adapter);
}
}
上面我们说创建数组适配器有三种方法,里面的参数的具体代表的意思是:
context:上下文环境
resource:自愿的ID
textviewresid:文本识图自愿的id,如下拉列表组建的id
objects:泛型集合或者数组