动态加载ListView的例子

package com.Activity; import android.app.ListActivity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.widget.AbsListView; import android.widget.AbsListView.OnScrollListener; import android.widget.BaseAdapter; import android.widget.LinearLayout; import android.widget.LinearLayout.LayoutParams; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.TextView; public class Activity01 extends ListActivity { private LinearLayout mLoadLayout; private ListView mListView; private final LayoutParams mProgressBarLayoutParams = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); private final LayoutParams mTipContentLayoutParams = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); private ListViewAdapter mListViewAdapter; private boolean mGetMore = false; private static int ALLCOUNT = 41; private Handler mHandler; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mListViewAdapter = new ListViewAdapter(); /* * 加载项布局，此布局被添加到ListVIew的Footer中 */ mLoadLayout = new LinearLayout(this); mLoadLayout.setMinimumHeight(60); mLoadLayout.setGravity(Gravity.CENTER); mLoadLayout.setOrientation(LinearLayout.HORIZONTAL); /* * 向加载项中加载一个圆形进度条 */ ProgressBar mProgressBar = new ProgressBar(this); mProgressBar.setPadding(0, 0, 15, 0); mLoadLayout.addView(mProgressBar, mProgressBarLayoutParams); /* * 向加载项中添加提示信息 */ TextView mTipContent = new TextView(this); mTipContent.setText("Loading..."); mLoadLayout.addView(mTipContent, mTipContentLayoutParams); /* * 获取ListView组件，并将加载项加入到组件中的Footer中 */ mListView = getListView(); mListView.addFooterView(mLoadLayout); /* * 设置list组件的adapter,并设置滑动监听事件 */ mListView.setAdapter(mListViewAdapter); mListView.setOnScrollListener(new onScroolListener()); mHandler = new Handler() { public void handleMessage(Message msg) { switch(msg.what){ case 0: if(mListViewAdapter.count <= ALLCOUNT){ mListViewAdapter.count += 10; } else{ mListView.removeFooterView(mLoadLayout); } mListViewAdapter.notifyDataSetChanged(); break; } } }; } class ListViewAdapter extends BaseAdapter{ int count = 10; public int getCount() { return count; } public Object getItem(int position) { return position; } public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { TextView mTextView; if(convertView == null){ mTextView = new TextView(Activity01.this); } else{ mTextView = (TextView)convertView; } mTextView.setText("Item "+position); mTextView.setTextSize(20f); mTextView.setHeight(60); return mTextView; } } class onScroolListener implements OnScrollListener{ public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { mGetMore = false; if(firstVisibleItem+visibleItemCount==totalItemCount){ mGetMore = true; } } public void onScrollStateChanged(AbsListView view, int scrollState) { if(mGetMore && scrollState == OnScrollListener.SCROLL_STATE_IDLE) mHandler.sendEmptyMessageDelayed(0, 1000); } } }