［转载］ ListView 实现像Android Market那样 分页加载 滚动加载

本文由csdn博主曾阳出品 地址http://blog.csdn.net/Zengyangtech/archive/2011/03/17/6255554.aspx

转载请注明

 

转载目的：保存学习，在此基础上做了一些修改，可以看到加载效果。

有一个问题：addFooterView必须要在setAdatper之前调用，这样相当于footerview一直都在下面，如果想实现滚到最下面再显示footerview，不知道该怎么办

 

public class ListViewScroll extends Activity {/** Called when the activity is first created. */private LayoutParams mLayoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);/** * 设置布局显示目标最大化属性 */private LayoutParams FFlayoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.FILL_PARENT);ListView listView;private int lastItem = 0;LinearLayout loadingLayout;private listViewAdapter adapter;private boolean isLoading;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);listView = (ListView) findViewById(R.id.myList);Log.i("test", "onCreate(Bundle savedInstanceState)>>>>>>>>>>>>>>>");// 线性布局LinearLayout layout = new LinearLayout(this);// 设置布局 水平方向layout.setOrientation(LinearLayout.HORIZONTAL);// 进度条ProgressBar progressBar = new ProgressBar(this);// 进度条显示位置progressBar.setPadding(0, 0, 15, 0);// 把进度条加入到layout中layout.addView(progressBar, mLayoutParams);// 文本内容TextView textView = new TextView(this);textView.setText("加载中...");textView.setGravity(Gravity.CENTER_VERTICAL);// 把文本加入到layout中layout.addView(textView, FFlayoutParams);// 设置layout的重力方向，即对齐方式是layout.setGravity(Gravity.CENTER);// 设置ListView的页脚layoutloadingLayout = new LinearLayout(this);loadingLayout.addView(layout, mLayoutParams);loadingLayout.setGravity(Gravity.CENTER);listView.addFooterView(loadingLayout);adapter = new listViewAdapter();listView.setAdapter(adapter);listView.setOnScrollListener(new OnScrollListener() {@Overridepublic void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {Log.i("test", "Scroll>>>first: " + firstVisibleItem+ ", visible: " + visibleItemCount + ", total: "+ totalItemCount);lastItem = firstVisibleItem + visibleItemCount - 1;Log.i("test", "Scroll>>>lastItem:" + lastItem);// 显示50条ListItem，即0-49，因为onScroll是在“滑动”执行过之后才触发，所以用adapter.count<=41作条件int scrolllength = 101;if (adapter.count <= scrolllength) {if (firstVisibleItem + visibleItemCount == totalItemCount) {// adapter.count += 10;// adapter.notifyDataSetChanged();// listView.setSelection(lastItem);// int currentPage = adapter.count / 10;// Toast.makeText(getApplicationContext(),// "第" + currentPage + "页", Toast.LENGTH_LONG)// .show();//isLoading用于控制重复加载if(!isLoading){new MyTask().execute(null);}}} else {listView.removeFooterView(loadingLayout);}}@Overridepublic void onScrollStateChanged(AbsListView view, int scrollState) {// TODO Auto-generated method stub}});}class listViewAdapter extends BaseAdapter {int count = 10; /* starting amount */public int getCount() {return count;}public Object getItem(int pos) {return pos;}public long getItemId(int pos) {return pos;}public View getView(int pos, View v, ViewGroup p) {Log.i("test", "getView>>>pos:" + pos);TextView view;if (v == null) {view = new TextView(ListViewScroll.this);} else {view = (TextView) v;}view.setText("ListItem " + pos);view.setTextSize(20f);view.setGravity(Gravity.CENTER);view.setHeight(60);return view;}}private class MyTask extends AsyncTask<Void, Void, Void> {@Overrideprotected void onPreExecute() {super.onPreExecute();isLoading =true;}@Overrideprotected Void doInBackground(Void... params) {try {Thread.sleep(5000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}adapter.count += 10;return null;}@Overrideprotected void onPostExecute(Void result) {super.onPostExecute(result);adapter.notifyDataSetChanged();listView.setSelection(lastItem);int currentPage = adapter.count / 10;Toast.makeText(getApplicationContext(), "第" + currentPage + "页",Toast.LENGTH_LONG).show();isLoading = false;}}}