Android实现联动下拉框 下拉列表spinner的实例代码
投稿:shangke
主要实现办法:动态加载各级下拉值的适配器
在本级下拉框,当本级下拉框的选中值改变时,随之修改下级的适配器的绑定值
XML布局:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="8dp" >
<Spinner
android:id="@+id/spin_province"
android:layout_width="80dp"
android:layout_height="wrap_content" />
<Spinner
android:id="@+id/spin_city"
android:layout_width="112dp"
android:layout_height="wrap_content" />
<Spinner
android:id="@+id/spin_county"
android:layout_width="100dp"
android:layout_height="wrap_content" />
</LinearLayout>
实现代码:
package com.example.android.demo.spinner;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
/*
* 设置下拉框
*/
private void setSpinner()
{
provinceSpinner = (Spinner)findViewById(R.id.spin_province);
citySpinner = (Spinner)findViewById(R.id.spin_city);
countySpinner = (Spinner)findViewById(R.id.spin_county);
//绑定适配器和值
provinceAdapter = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, province);
provinceSpinner.setAdapter(provinceAdapter);
provinceSpinner.setSelection(3,true); //设置默认选中项,此处为默认选中第4个值
cityAdapter = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, city[3]);
citySpinner.setAdapter(cityAdapter);
citySpinner.setSelection(0,true); //默认选中第0个
countyAdapter = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, county[3][0]);
countySpinner.setAdapter(countyAdapter);
countySpinner.setSelection(0, true);
//省级下拉框
provinceSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
// 表示选项被改变的时候触发此方法,主要实现办法:动态改变地级适配器的绑定值
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long arg3)
{
//position为当前省级选中的值的序号
//将地级适配器的值改变为city[position]中的值
cityAdapter = new ArrayAdapter<String>(
MainActivity.this, android.R.layout.simple_spinner_item, city[position]);
// 设置二级下拉列表的选项内容适配器
citySpinner.setAdapter(cityAdapter);
provincePosition = position; //记录当前省级序号,留给下面修改县级适配器时用
}
@Override
public void onNothingSelected(AdapterView<?> arg0)
{
}
});
citySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int position, long arg3)
{
countyAdapter = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, county[provincePosition][position]);
countySpinner.setAdapter(countyAdapter);
}
@Override
public void onNothingSelected(AdapterView<?> arg0)
{
}
});
}
}
要获取下拉框spinner中选中的值,用下面这方法就OK了
provinceSpinner.getSelectedItem().toString();
citySpinner.getSelectedItem().toString();
countySpinner.getSelectedItem().toString();
THE END