Android使用Spinner控件实现下拉列表的案例
(1)两种方法提冲Spinner中的数据源:通过list集合,或者是通过xml文件进行配置
(2)布局代码如下:
<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" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginTop="46dp" android:text="所属城市" android:textSize="22sp" /> <Spinner android:id="@+id/spinner1" android:layout_width="200sp" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_marginTop="44dp" android:layout_toRightOf="@+id/textView1" /> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignRight="@+id/textView1" android:layout_centerVertical="true" android:text="所属星球" /> <Spinner android:id="@+id/spinner2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/spinner1" android:layout_alignTop="@+id/textView2" android:layout_marginLeft="21dp" /> </RelativeLayout>
(3)
package com.example.spinners; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.Toast; /** * 通过继承OnItemSelectedListener接口来实现选择时的事件 * @author xuliugen * */ public class MainActivity extends Activity implements OnItemSelectedListener { private Spinner spinner1; private Spinner spinner2; // private SpinnerAdapter spinnerAdapter; private ArrayAdapter<String> adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); spinner1 = (Spinner) this.findViewById(R.id.spinner1); spinner2 = (Spinner) this.findViewById(R.id.spinner2); // 第一种手工输入的list adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_item, getDataSource()); spinner1.setAdapter(adapter); //注册监听器 spinner1.setOnItemSelectedListener(this); // 第二种:通过加载xml文件配置的数据源 ArrayAdapter adapter2 = ArrayAdapter.createFromResource(this, R.array.planets_array, android.R.layout.simple_spinner_item); adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner2.setAdapter(adapter2); } /* * 通过第一种方法:手工输入的list */ public List<String> getDataSource() { List<String> list = new ArrayList<String>(); list.add("beijing"); list.add("beida"); list.add("shahai"); list.add("shangjing"); list.add("shanglian"); list.add("chengdu"); return list; } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { String itemString = spinner1.getItemAtPosition(position).toString(); Toast.makeText(this, "你选中的是" + itemString, 1).show(); } @Override public void onNothingSelected(AdapterView<?> parent) { } }
(4)资源文件中的配置如下:
<?xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">Spinners</string> <string name="action_settings">Settings</string> <string name="hello_world">Hello world!</string> <string-array name="planets_array"> <item>Mercury</item> <item>Venus</item> <item>Earth</item> <item>Mars</item> <item>Jupiter</item> <item>Saturn</item> <item>Uranus</item> <item>Neptune</item> </string-array> </resources>
(5)运行结果如下所示:
总结
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