首页 / 移动开发 / Android / Android实现滑动加载数据的方法

本文实例讲述了Android实现滑动加载数据的方法。分享给大家供大家参考。具体实现方法如下：
EndLessActivity.java如下：

package com.ScrollListView;import Android.app.ListActivity;import Android.os.Bundle;import Android.view.Gravity;import Android.view.View;import Android.view.ViewGroup;import Android.widget.AbsListView;import Android.widget.BaseAdapter;import Android.widget.LinearLayout;import Android.widget.ProgressBar;import Android.widget.TextView;import Android.widget.AbsListView.OnScrollListener;public class EndLessActivity extends ListActivity implements OnScrollListener { Aleph0 adapter = new Aleph0（）;int mProgressStatus = 0 ; ProgressBar progressBar;protected void onCreate（Bundle savedInstanceState） { super .onCreate（savedInstanceState）;LinearLayout searchLayout = new LinearLayout（ this ）;searchLayout.setOrientation（LinearLayout.HORIZONTAL）;progressBar = new ProgressBar（ this ）;progressBar.setPadding（ 0 , 0 , 15 , 0 ）;searchLayout.addView（progressBar, new LinearLayout.LayoutParams（LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT））;TextView textView = new TextView（ this ）;textView.setText（ " 加载中... " ）;textView.setGravity（Gravity.CENTER_VERTICAL）;searchLayout.addView（textView, new LinearLayout.LayoutParams（LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.FILL_PARENT））;searchLayout.setGravity（Gravity.CENTER）;LinearLayout loadingLayout = new LinearLayout（ this ）;loadingLayout.addView（searchLayout, new LinearLayout.LayoutParams（LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT））;loadingLayout.setGravity（Gravity.CENTER）;getListView（）.addFooterView（loadingLayout）;setListAdapter（adapter）; getListView（）.setOnScrollListener（ this ）; }public void onScroll（AbsListView view, int firstVisible, int visibleCount, int totalCount） { boolean loadMore = /* maybe add a padding */ firstVisible + visibleCount >= totalCount; if （loadMore） { adapter.count += visibleCount; // or any other amountadapter.notifyDataSetChanged（）;} }public void onScrollStateChanged（AbsListView v, int s） { } class Aleph0 extends BaseAdapter { int count = 40 ; /* 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） {TextView view = new TextView（EndLessActivity. this ）;view.setText（ " entry " + pos）; return view;} }}

listview下部是按钮控制：

package com.ScrollListView;import Android.app.ListActivity;import Android.os.Bundle;import Android.view.Gravity;import Android.view.View;import Android.view.ViewGroup;import Android.widget.AbsListView;import Android.widget.BaseAdapter;import Android.widget.Button;import Android.widget.LinearLayout;import Android.widget.ProgressBar;import Android.widget.TextView;import Android.widget.AbsListView.OnScrollListener;public class EndLessActivity extends ListActivity { Aleph0 adapter = new Aleph0（）;int mProgressStatus = 0 ;protected void onCreate（Bundle savedInstanceState） { super .onCreate（savedInstanceState）;LinearLayout searchLayout = new LinearLayout（ this ）;searchLayout.setOrientation（LinearLayout.HORIZONTAL）;Button textView = new Button（ this ）;textView.setText（ " 加载中... " ）;textView.setGravity（Gravity.CENTER_VERTICAL）;searchLayout.addView（textView, new LinearLayout.LayoutParams（LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.FILL_PARENT））;searchLayout.setGravity（Gravity.CENTER）;LinearLayout loadingLayout = new LinearLayout（ this ）;loadingLayout.addView（searchLayout, new LinearLayout.LayoutParams（LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT））;loadingLayout.setGravity（Gravity.CENTER）;getListView（）.addFooterView（loadingLayout）;textView.setOnClickListener（ new Button.OnClickListener（）{@Overridepublic void onClick（View v） { adapter.count += 10 ;adapter.notifyDataSetChanged（）; }}）; setListAdapter（adapter）;// getListView（）.setOnScrollListener（this）;} /* public void onScroll（AbsListView view,int firstVisible, int visibleCount, int totalCount） {boolean loadMore =firstVisible + visibleCount >= totalCount;if（loadMore） { adapter.count += visibleCount;adapter.notifyDataSetChanged（）;} } */public void onScrollStateChanged（AbsListView v, int s） { } class Aleph0 extends BaseAdapter { int count = 40 ; /* 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） {TextView view = new TextView（EndLessActivity. this ）;view.setText（ " entry " + pos）; return view;} }}

希望本文所述对大家的Android程序设计有所帮助。