ListView学习（一） 滑动分页时底部显示进度条

http://erwin-king.iteye.com/blog/1066632

我们在使用listview时难免会遇到分页的情况，既然是分页，那么能给用户看见分页的情况，无疑让用户在等待下一页数据的时候会有好处的，如果获取下一页时间过久的话，用户会觉得好像死机了，这样就会给用户一个不好的体验，下面我就来实现在listview分页是现实进度条，由于这个效果的要求不高，我只使用了很简单的方式来实现，高手莫笑哦！

1、首先便是xml文件

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

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/main" android:orientation="vertical"

android:background="@drawable/mainapp_ic_bg" android:layout_width="fill_parent"

android:layout_height="fill_parent">

<LinearLayout android:gravity="center_horizontal" android:layout_above="@+id/main_progessbar" android:layout_alignParentTop="true"

android:orientation="vertical" android:id="@+id/top" android:layout_width="fill_parent"

android:layout_height="fill_parent">

<TextView android:text="学习" android:background="@drawable/com_ttb_1l_bg"

android:id="@+id/main_title"

android:layout_width="fill_parent" android:gravity="center"

android:layout_height="wrap_content" android:textSize="18dip"

android:textColor="@color/white" android:visibility="gone"/>

<ListView android:id="@+id/main_listview" android:layout_below="@+id/main_title" android:cacheColorHint="#00000000"

android:layout_width="fill_parent" android:layout_height="fill_parent"></ListView>

</LinearLayout>

<LinearLayout android:gravity="center" android:layout_alignParentBottom="true"

android:background="@color/black" android:id="@+id/main_progessbar" android:layout_width="fill_parent"

android:visibility="gone" android:layout_height="wrap_content" >

<ProgressBar android:layout_width="wrap_content"

android:layout_height="wrap_content"></ProgressBar>

<TextView android:text="加载中..." android:layout_width="wrap_content"

android:paddingLeft="10dip" android:gravity="center" android:layout_height="fill_parent"></TextView>

</LinearLayout>

</RelativeLayout>

2、activity类

public class ListView_ProgressBar extends Activity implements OnScrollListener {

int lastItem = 0;

int mProgressStatus = 0;

private Handler mHandler = new Handler();

ProgressBar progressBar;

MyAdapter myAdapter;

List<String> str = new ArrayList<String>();

int pageNo = 1;

ListView listview;

int totalPage = 10;

int totalRecord = 200;

LinearLayout main_progessbarn;

private boolean isScrolling = false;

int now = 0;

boolean isPagination = false;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_NO_TITLE);

setContentView(R.layout.main);

main_progessbarn = (LinearLayout)findViewById(R.id.main_progessbar);

listview = (ListView) findViewById(R.id.main_listview);

for (int i = 0; i < 15; i++) {

str.add("条目内容" + (pageNo-1)*20+i);

}

myAdapter = new MyAdapter(ListView_ProgressBar.this, str);

listview.setAdapter(myAdapter);

listview.setOnScrollListener(this);

}

public void onScroll(AbsListView v, int firstVisibleItem,

int visibleItemCount, int totalItemCount) {

lastItem = firstVisibleItem + visibleItemCount - 1;

System.out.println("lastItem:" + lastItem);

}

public void onScrollStateChanged(AbsListView v, int state) {

if (lastItem == str.size()-1

&& state == OnScrollListener.SCROLL_STATE_IDLE) {

pageNo++;

if (pageNo <= totalPage) {

ccc(pageNo);

}

}

}

private void ccc(final int pageNo){

main_progessbarn.setVisibility(View.VISIBLE);

new Thread() {

public void run() {

getStringList(pageNo);

mHandler.post(refreshAdapter);

}

}.start();

}

private Runnable refreshAdapter = new Runnable() {

public void run() {

myAdapter.notifyDataSetChanged();

main_progessbarn.setVisibility(View.GONE);

}

};

public void getStringList(int pageNo) {

for (int i = 0; i < 10000; i++) {

str.add("条目内容" + (pageNo-1)*20+i);

}

}

}

3、listview适配器

public class MyAdapter extends BaseAdapter {

Context context;

List<String> list;

LayoutInflater lif;

public MyAdapter(Context context, List<String> list,) {

this.context = context;

this.list = list;

}

public int getCount() {

if (list != null) {

return list.size();

} else {

return 0;

}

}

public Object getItem(int position) {

return null;

}

public long getItemId(int position) {

// mHandler.post(mScrollToButton);//传�?�?��消息进行滚动

return position;

}

public View getView(final int position, View convertView, ViewGroup parent) {

final MyView mv;

if (convertView == null) {

mv = new MyView();

lif = LayoutInflater.from(context);// 转化到context这个容器

convertView = lif.inflate(R.layout.main_item, null);// 设置要转化的layout文件

} else {

mv = (MyView) convertView.getTag();

}

mv.tv1 = (TextView) convertView.findViewById(R.id.main_listview_item);// 取得实例

System.out.println("条目内容" + list.get(position));

mv.tv1.setText(list.get(position));

if ((position % 2) == 0) {

convertView.setBackgroundResource(R.drawable.com_list_bg_d);

} else {

convertView.setBackgroundResource(R.drawable.com_list_bg_s);

}

convertView.setTag(mv);

return convertView;

}

private static class MyView {

TextView tv1;

}

}

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