Android常见UI组件之ListView(二)——定制ListView

时间:2014-05-07 02:47:23   收藏:0   阅读:591

Android常见UI组件之ListView(二)——定制ListView


这一篇接上篇,展示ListView中选择多个项及实现筛选功能~

1、在位于res/values文件夹下的strings.xml文件中添加如下代码:

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">BasicView5</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
	<string-array name="presidents_array">
	    <item>Dwight D. Eisenhower</item>
	    <item>John F. Kennedy</item>
	    <item>Lyndon B. Johnson</item>
	    <item>Richard Nixon</item>
	    <item>Gerald Ford</item>
	    <item>Jimmy Carter</item>
	    <item>Ronald Reagan</item>
	    <item>George H.W. Bush</item>
	    <item>Bill Clinton</item>
	    <item>George W. Bush</item>
	    <item>Barack Obama</item>
	</string-array>
</resources>


2、修改上一篇中的BasicView5.java文件的代码,修改后的代码如下:

package com.example.basicview5;

import android.os.Bundle;
import android.app.Activity;
import android.app.ListActivity;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends ListActivity {
	String[] presidents;//将列表信息存储在strings.xml文件中,再以编程方式读取

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// ---no need to call this---//
		// setContentView(R.layout.activity_main);

		ListView listView = getListView();// 获取ListActivity的列表视图
		listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);// 可以选择多个项
		listView.setTextFilterEnabled(true);//启用筛选功能,在键盘上输入,ListView自动筛选
		// getResources()方法以编程方式检索与应用程序捆绑的资源
		presidents = getResources().getStringArray(R.array.presidents_array);

		setListAdapter(new ArrayAdapter<String>(this,
				android.R.layout.simple_list_item_checked, presidents));
	}

	public void onListItemClick(ListView parent, View v, int position, long id) {
		Toast.makeText(this, "You have selected " + presidents[position],
				Toast.LENGTH_SHORT).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;
	}

}


3、运行程序,效果如下:

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4、在activity_main.xml文件中添加代码如下:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    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" >

    <Button
        android:id="@+id/btn"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:onClick="onClick"
        android:text="Show selected items" />

    <ListView
        android:id="@+id/android:list"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

5、在BasicView5.java文件中添加代码,如下:

package com.example.basicview5;

import android.os.Bundle;
import android.app.Activity;
import android.app.ListActivity;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends ListActivity {
	String[] presidents;//将列表信息存储在strings.xml文件中,再以编程方式读取

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// ---need to call this---//
		setContentView(R.layout.activity_main);//由于在xml文件中添加了一个ListView部分填充一个活动,所以需要加载活动内容。

		ListView listView = getListView();// 获取ListActivity的列表视图
		listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);// 可以选择多个项
		listView.setTextFilterEnabled(true);//启用筛选功能,在键盘上输入,ListView自动筛选
		// getResources()方法以编程方式检索与应用程序捆绑的资源
		presidents = getResources().getStringArray(R.array.presidents_array);

		setListAdapter(new ArrayAdapter<String>(this,
				android.R.layout.simple_list_item_checked, presidents));
	}

	public void onListItemClick(ListView parent, View v, int position, long id) {
		Toast.makeText(this, "You have selected " + presidents[position],
				Toast.LENGTH_SHORT).show();
	}

	public void onClick(View view) {
		ListView listView = getListView();
		String itemsSelected = "Selected items: \n";
		for(int i = 0; i < listView.getCount(); i++) {
			if(listView.isItemChecked(i)) {//找出被选中的item
				itemsSelected += listView.getItemAtPosition(i) + "\n";//返回指定位置的項的名称
			}
		}
		Toast.makeText(this, itemsSelected, 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;
	}

}

6、运行效果如下:

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筛选并选中几个项,再按按钮显示选择了那些项:

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Android常见UI组件之ListView(二)——定制ListView,布布扣,bubuko.com

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