android 滑动加载数据

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;         }     } }

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