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ListView下拉加载一(分页)
首先创建在主xml里放置一个listview列表,代码如下：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent" android:layout_height="fill_parent" tools:context=".MainActivity" > <ListView android:id="@+id/menuList" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1" > </ListView></LinearLayout>
再创建2个xml，分别为列表项（menu.xml）和加载界面（loadmore.xml）
menu.xml代码如下：
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <TextView android:id="@+id/showView" android:layout_width="fill_parent" android:layout_height="wrap_content" android:padding="10dp" style="@style/normalText" android:text="title" /> <TextView android:id="@+id/content" android:layout_width="fill_parent" android:layout_height="wrap_content" android:padding="10dp" android:text="123" /></LinearLayout>
loadmore.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="fill_parent" android:orientation="horizontal" > <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center" android:background="@drawable/list_bg" > <ProgressBar android:id="@+id/progressBar1" android:layout_width="25dp" android:layout_height="25dp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="正在加载数据..." /> </LinearLayout></LinearLayout>
loadmore的背景样式list_bg.xml：
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"> <gradient android:startColor="#ccc" android:endColor="#ccc" android:angle="45" /> </shape>
入口代码如下：
package com.tp.soft.app;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.util.Log;import android.view.LayoutInflater;import android.view.Menu;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.ListView;import android.widget.ProgressBar;import android.widget.TextView;public class MainActivity extends Activity{ private ListView mListView; private View mLoadMoreView; private ProgressBar mLoadBtn; private PageAdapter adapter; private Handler handler = new Handler(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mLoadMoreView = getLayoutInflater().inflate(R.layout.loadmore, null); mLoadBtn = (ProgressBar) mLoadMoreView.findViewById(R.id.progressBar1); //mLoadBtn.setOnClickListener(this); mListView = (ListView) findViewById(R.id.menuList); //下拉滚动触发事件 mListView.setOnScrollListener(new OnScrollListener() { @Override public void onScrollStateChanged(AbsListView view, int scrollState) { //不滚动 if(scrollState == OnScrollListener.SCROLL_STATE_IDLE){ //滚动最底部 if(view.getLastVisiblePosition() == view.getCount() -1){ //mLoadBtn.setText("正在加载中..."); MyRunnable r = new MyRunnable(); handler.postDelayed(r, 2000); } } } @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { } }); mListView.addFooterView(mLoadMoreView); List<String> itemList = new ArrayList<String>(); for (int i = 0; i < 10; i++) { itemList.add("title"+i); } adapter = new PageAdapter(itemList); mListView.setAdapter(adapter); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); return true; } /*@Override public void onClick(View v) { mLoadBtn.setText("正在加载中..."); MyRunnable r = new MyRunnable(); handler.postDelayed(r, 2000); }*/ class MyRunnable implements Runnable{ @Override public void run() { Log.e("提示", "123"); loadMoreDate(); //更新UI adapter.notifyDataSetChanged(); //mLoadBtn.setText("查看更多..."); } } class PageAdapter extends BaseAdapter { List<String> itemList; public PageAdapter(List<String> itemList){ this.itemList = itemList; } @Override public View getView(int position, View convertView, ViewGroup parent) { if(convertView == null){ convertView = LayoutInflater.from(getApplicationContext()).inflate(R.layout.menu, null); } TextView titleView = (TextView) convertView.findViewById(R.id.showView); titleView.setText(itemList.get(position)); return convertView; } @Override public long getItemId(int position) { return position; } @Override public Object getItem(int position) { return itemList.get(position); } @Override public int getCount() { return itemList.size(); } public void addItem(String str){ itemList.add(str); } } private void loadMoreDate() { Log.e("总数", ""+adapter.getCount()); int count = adapter.getCount(); for(int i = count+1; i < count+10; i++){ adapter.addItem("title"+i); } }}
运行结果：
ListView下拉加载一(分页)
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