Android实现滑动加载数据的方法

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;  } }}

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;  } }}