Android 开发 列表选择框实现<列表项可知>

将列表选择框的内容以数组形式写进xml，存在value中

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="ctype">
<item>ch1</item>
<item>ch2</item>
<item>ch3</item>
<item>ch4</item>
<item>ch5</item>
</string-array>
</resources>

在layout中设置Spinner
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="choose"
android:height="50px"/>
<Spinner
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/ch"
android:entries="@array/ctype">
</Spinner>
</LinearLayout>


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) {

}
});
}
}