本文实例讲述了Android编程开发之Spinner控件用法。分享给大家供大家参考,具体如下:
下拉列表 Spinner,Spinner是一个每次只能选择所有项的一个项的控件。它的项来自于与之相关联的适配器中。
Spinner的使用,可以极大提高用户的体验性。当需要用户选择的时候,可以提供一个下拉列表将所有可选的项列出来。供用户选择。
一、使用数组作为数据源
布局文件:
<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=\".MainActivity\" > <Spinner android:id=\"@+id/spinner1\" android:layout_width=\"match_parent\" android:layout_height=\"wrap_content\" android:layout_alignParentLeft=\"true\" android:layout_alignParentTop=\"true\" /> </RelativeLayout>
MainActivity.java
package com.example.lesson16_spinner; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.SimpleAdapter; import android.widget.Spinner; import android.widget.Toast; public class MainActivity extends Activity { // 声明spinner对象 private Spinner spinner; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); spinner = (Spinner) findViewById(R.id.spinner1); //使用数组作为数据源 final String arr[] = new String[] { \"周一\", \"周二\", \"周三\", \"周四\", \"周五\", \"周六\", \"周七\" }; // adpater对象 ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, arr); List<Map<String, Object>> data = new ArrayList<Map<String, Object>>(); Map<String, Object> map = new HashMap<String, Object>(); map.put(\"logo\", R.drawable.ic_launcher); map.put(\"text\", \"xxxx说明操作\"); Map<String, Object> map2 = new HashMap<String, Object>(); map2.put(\"logo\", R.drawable.ic_launcher); map2.put(\"text\", \"xxx说明xxx\"); data.add(map); data.add(map2); SimpleAdapter simpleAdapter = new SimpleAdapter(this, data, R.layout.activity_item, new String[] { \"logo\", \"text\" }, new int[] { R.id.imageView1, R.id.textView1 }); // 设置显示的数据 spinner.setAdapter(arrayAdapter); //spinner.setAdapter(simpleAdapter); Toast.makeText(getApplicationContext(),\"main Thread\"+ spinner.getItemAtPosition(spinner.getSelectedItemPosition()), Toast.LENGTH_LONG).show(); // 注册事件 spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { // String content = arr[position]; Spinner spinner = (Spinner) parent; Toast.makeText(getApplicationContext(), \"xxxx\" + spinner.getItemAtPosition(position), Toast.LENGTH_LONG).show(); } @Override public void onNothingSelected(AdapterView<?> parent) { Toast.makeText(getApplicationContext(), \"没有改变的处理\", Toast.LENGTH_LONG).show(); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } }
效果如下:
二、使用XML作为数据源(非本人代码)
布局文件:
<?xml version=\"1.0\" encoding=\"utf-8\"?> <resources> <string-array name=\"plantes\"> <item>NOKIA</item> <item>MOTO</item> <item>HTC</item> <item>LG</item> <item>其他</item> </string-array> </resources>
java代码:
import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.TextView; public class SpinnerActivity extends Activity { private TextView view2; private Spinner spinner2; private ArrayAdapter adapter2; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.spinner); spinner2 = (Spinner) findViewById(R.id.spinner02); view2 = (TextView) findViewById(R.id.spinnerText02); //将可选内容与ArrayAdapter连接起来 adapter2 = ArrayAdapter.createFromResource(this, R.array.plantes, android.R.layout.simple_spinner_item); //设置下拉列表的风格 adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); //将adapter2 添加到spinner中 spinner2.setAdapter(adapter2); //添加事件Spinner事件监听 spinner2.setOnItemSelectedListener(new SpinnerXMLSelectedListener()); //设置默认值 spinner2.setVisibility(View.VISIBLE); } //使用XML形式操作 class SpinnerXMLSelectedListener implements OnItemSelectedListener{ public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { view2.setText(\"你使用什么样的手机:\"+adapter2.getItem(arg2)); } public void onNothingSelected(AdapterView<?> arg0) { } } }
希望本文所述对大家Android程序设计有所帮助。
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