Android实现滑动加载数据的方法_Android

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 amount 

									   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;

									  }

									 }

									}

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()

									    {  @Override

									     public 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;

									  }

									 }

									}