ListView动态加载数据模板（使用xml布局）

继上一篇ListView动态加载数据模板（使用代码布局），笔者想利用xml布局文件实现一下，因为布局文件在xml文件中实现要规范一些，原理和之前那一篇是一样的，直接来代码

主布局文件other_listview.xml，注意ListView定义id的方式

<?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"
    >
    <ListView  
        android:id="@android:id/list"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        />
</LinearLayout>

ListView里面每个Item的布局文件other_listview_item.xml，里面的ImageView使用的图片自己可以随便替换一张

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:scaleType="fitXY"
        android:src="@drawable/avira_antyvir"/>
    <TextView
        android:id="@+id/tv"
        android:layout_width="fill_parent" 
        android:layout_height="20dp" 
        android:text="@string/hello"
        />
</LinearLayout>

再来个布局文件other_listview_footer_more.xml，这个文件就是ListView最下面那个View，当点击Button的时候显示进度条

<?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"
    >
    <Button
        android:id="@+id/button"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="更多"
        />
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:id="@+id/linearlayout">
        <ProgressBar
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="正在获取..."/>    
    </LinearLayout>
</LinearLayout>

类文件OtherListView.java

package com.focus.loading;

import android.app.ListActivity;
import android.os.Bundle;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;

public class OtherListView extends ListActivity implements OnScrollListener {

    ListView list;
    int scrollState;
    int count = 40;
    int lastItem;
    int visibleItemCount;

    Button footerButton;
    LinearLayout footerProgressBarLayout;
    View view;
    ListAdapter listAdapter = new ListAdapter();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.other_listview);

        LayoutInflater inflater = LayoutInflater.from(this);
        view = inflater.inflate(R.layout.other_listview_footer_more, null);
        footerButton = (Button) view.findViewById(R.id.button);
        footerProgressBarLayout = (LinearLayout) view
                .findViewById(R.id.linearlayout);
        footerProgressBarLayout.setVisibility(View.GONE);
        footerButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                if (lastItem == listAdapter.count
                        && scrollState == OnScrollListener.SCROLL_STATE_IDLE) {
                    footerButton.setVisibility(View.GONE);
                    footerProgressBarLayout.setVisibility(View.VISIBLE);
                    if (listAdapter.count <= count) {
                        new Handler().postDelayed(new Runnable() {

                            @Override
                            public void run() {
                                listAdapter.count += 10;
                                listAdapter.notifyDataSetChanged();
                                // list.setSelection(lastItem);
                                footerButton.setVisibility(View.VISIBLE);
                                footerProgressBarLayout
                                        .setVisibility(View.GONE);
                            }
                        }, 2000);
                    }

                }
            }
        });

        list = getListView();
        list.addFooterView(view);
        list.setAdapter(listAdapter);
        list.setOnScrollListener(this);
    }

    class ListAdapter extends BaseAdapter {

        int count = 10;

        @Override
        public int getCount() {
            return count;
        }

        @Override
        public Object getItem(int position) {
            return position;
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            LayoutInflater inflater = LayoutInflater.from(OtherListView.this);
            View view = inflater.inflate(R.layout.other_listview_item, null);
            TextView tv = (TextView) view.findViewById(R.id.tv);
            tv.setText("Hello World " + position);
            return view;
        }

    }

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem,
            int visibleItemCount, int totalItemCount) {
        this.visibleItemCount = visibleItemCount;
        lastItem = firstVisibleItem + visibleItemCount - 1;
        System.out.println(listAdapter.count);
        if (listAdapter.count >= count) {
            list.removeFooterView(view);
        }
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        this.scrollState = scrollState;

    }
}