xListView的用法

最新推荐文章于 2018-04-22 19:27:50 发布

原创最新推荐文章于 2018-04-22 19:27:50 发布 · 131 阅读

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文章标签：

#xListView #分页 #ListView优化 #ListView下拉刷新 #ListView加载更多

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本文介绍了一个自定义的Android列表组件XListView的实现方法，包括如何设置拖动刷新和加载更多功能，通过实例代码展示了XListView的基本用法。

MainActivity.java


package com.ct7.XListView.Main;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Timer;
import java.util.TimerTask;

import com.ct7.XListView.R;
import com.ct7.XListView.R.layout;
import com.ct7.XListView.R.menu;
import com.ct7.XListView.XListView;
import com.ct7.XListView.XListView.XListViewListener;
import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.widget.ArrayAdapter;

public class MainActivity extends Activity implements XListViewListener {

	private List<String> items = new ArrayList<String>();
	private int status = 0;
	private XListView xListView;
	private Handler handler;
	private static int refershcount = 0;
	private long refreshTime = 0;
	private ArrayAdapter<String> adapter;
	private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		findView();
		getItems();
		xListView.setPullLoadEnable(true);// 拖动加载为 true
		xListView.setAdapter(adapter = new ArrayAdapter<String>(
				MainActivity.this, R.layout.activity_item, items));
		setListener();

		handler = new Handler();// 处理器
	}

	private void setListener() {
		// TODO Auto-generated method stub
		xListView.setXListViewListener(this);
	}

	private void findView() {
		// TODO Auto-generated method stub
		xListView = (XListView) findViewById(R.id.xListView);
	}

	// 获取数据
	private void getItems() {
		for (int i = 0; i < 20; ++i) {
			items.add("测试数据" + (++status));
		}
	}

	@Override
	public void onRefresh() {
		// TODO Auto-generated method stub
		Log.v("bao", "onRefresh");
		handler.postDelayed(new Runnable() {

			@Override
			public void run() {
				// TODO Auto-generated method stub
				status = refershcount;
				items.clear();
				getItems();// 获取数据
				adapter = new ArrayAdapter<String>(MainActivity.this,
						R.layout.activity_item, items);
				xListView.setAdapter(adapter);
				onLoad();
			}
		}, 500);
	}

	private void onLoad() {
		xListView.stopRefresh();
		xListView.stopLoadMore();

		xListView.setRefreshTime("刚刚");
		refreshTime = Calendar.getInstance(Locale.CHINA).getTime().getTime();
		refreshTime();
	}

	public void refreshTime() {

		Timer timer=new Timer();
		timer.schedule(new TimerTask() {
			@Override
			public void run() {
				// TODO Auto-generated method stub

				findView();
				getItems();
				xListView.setPullLoadEnable(true);// 拖动加载为 true
				xListView.setAdapter(adapter = new ArrayAdapter<String>(
						MainActivity.this, R.layout.activity_item, items));
				setListener();

				adapter.setNotifyOnChange(true);//继续往下面加载      视图不会回到头部
				xListView.setRefreshTime(dateFormat.format(refreshTime));
			}
		},5000);//当前时间开始5秒后启动

	}

	@Override
	public void onLoadMore() {
		// TODO Auto-generated method stub
		handler.postDelayed(new Runnable() {
			@Override
			public void run() {
				// TODO Auto-generated method stub
				getItems();// 获取数据
				adapter.setNotifyOnChange(true);//继续往下面加载      视图不会回到头部
				//xListView.setAdapter(adapter);
				onLoad();
			}
		}, 500);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}
}

activity_main.xml:


<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="match_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world"/>

    <com.ct7.XListView.XListView
        android:id="@+id/xListView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:cacheColorHint="#0000ff"
        />

</LinearLayout>

xlistview_header.xml


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="bottom" >

    <RelativeLayout
        android:id="@+id/xlistview_header_content"
        android:layout_width="fill_parent"
        android:layout_height="60dp" >

        <LinearLayout
            android:id="@+id/xlistview_header_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:gravity="center"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/xlistview_header_hint_textview"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="下拉刷新" />

            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="3dp" >

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="上次更新时间："
                    android:textSize="12sp" />

                <TextView
                    android:id="@+id/xlistview_header_time"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textSize="12sp" />
            </LinearLayout>
        </LinearLayout>

        <ImageView
            android:id="@+id/xlistview_header_arrow"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@id/xlistview_header_text"
            android:layout_centerVertical="true"
            android:layout_marginLeft="-35dp"
            android:src="@drawable/xlistview_arrow" />

        <ProgressBar
            android:id="@+id/xlistview_header_progressbar"
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_alignLeft="@id/xlistview_header_text"
            android:layout_centerVertical="true"
            android:layout_marginLeft="-40dp"
            android:visibility="invisible" />
    </RelativeLayout>

</LinearLayout>

xlistview_footer.xml


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <RelativeLayout
        android:id="@+id/xlistview_footer_content"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:padding="10dp" >

        <ProgressBar
            android:id="@+id/xlistview_footer_progressbar"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:visibility="invisible" />

        <TextView
            android:id="@+id/xlistview_footer_hint_textview"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:text="查看更多" />
    </RelativeLayout>

</LinearLayout>

activity_item.xml


<TextView 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:textSize="26sp" >

</TextView>

项目的目录结构如下：
[img]http://dl2.iteye.com/upload/attachment/0098/0030/4682b8b2-1c80-3dba-a01d-e3fe0433f1b9.png[/img]