ListView 分段加载

转载 http://yangguangfu.iteye.com/blog/832809

 

滚动方式：

 

    package com.yangguangfu.listview;  
      
    import android.app.ListActivity;  
    import android.os.Bundle;  
    import android.util.Log;  
    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.ListView;  
    import android.widget.ProgressBar;  
    import android.widget.TextView;  
    import android.widget.AbsListView.OnScrollListener;  
    import android.widget.LinearLayout.LayoutParams;  
    /** 
     *  
     * @author 阿福 
     * 
     */  
    public class MainActivity extends ListActivity implements OnScrollListener {  
          
        private static final String TAG = "MainActivity";  
        private listViewAdapter adapter = new listViewAdapter();  
        private int lastItem = 0;  
        /** 
         * 设置布局显示为目标有多大就多大 
         */  
        private LayoutParams WClayoutParams =new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);  
        /** 
         * 设置布局显示目标最大化 
         */  
        private LayoutParams FFlayoutParams =new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.FILL_PARENT);  
          
        private ProgressBar progressBar;  
      
        protected void onCreate(Bundle savedInstanceState) {  
            super.onCreate(savedInstanceState);  
      
            Log.i(TAG, "onCreate(Bundle savedInstanceState)" );  
            //线性布局  
            LinearLayout layout = new LinearLayout(this);  
           //设置布局 水平方向  
            layout.setOrientation(LinearLayout.HORIZONTAL);  
             //进度条  
            progressBar = new ProgressBar(this);  
             //进度条显示位置  
            progressBar.setPadding(0, 0, 15, 0);  
              
            layout.addView(progressBar, WClayoutParams);  
              
            TextView textView = new TextView(this);  
            textView.setText("加载中...");  
            textView.setGravity(Gravity.CENTER_VERTICAL);  
              
            layout.addView(textView, FFlayoutParams);  
            layout.setGravity(Gravity.CENTER);  
              
            LinearLayout loadingLayout = new LinearLayout(this);  
            loadingLayout.addView(layout, WClayoutParams);  
            loadingLayout.setGravity(Gravity.CENTER);  
              
            //得到一个ListView用来显示条目  
            ListView listView = getListView();  
            //添加到脚页显示  
            listView.addFooterView(loadingLayout);  
            //  
            registerForContextMenu(listView);  
            //  
            setListAdapter(adapter);  
            listView.setOnScrollListener(this);  
        }  
      
        public void onScroll(AbsListView v, int firstVisibleItem,  
                int visibleItemCount, int totalItemCount) {  
            lastItem = firstVisibleItem + visibleItemCount - 1;  
            System.out.println("lastItem:" + lastItem);  
            Log.i(TAG, "lastItem:" + lastItem);  
              
        }  
      
        public void onScrollStateChanged(AbsListView v, int state) {  
            if (lastItem == adapter.count  
                    && state == OnScrollListener.SCROLL_STATE_IDLE) {  
                adapter.count += 10;  
                adapter.notifyDataSetChanged();  
                Log.i(TAG, "lastItem:" + lastItem);  
            }  
        }  
      /** 
       * 要用用于生成显示数据 
       * @author 阿福 
       * 
       */  
        class listViewAdapter extends BaseAdapter {  
            int count = 10;  
      
            public int getCount() {  
                Log.i(TAG, "count:" + count);  
                return count;  
            }  
      
            public Object getItem(int pos) {  
                Log.i(TAG, "pos:" + pos);  
                return pos;  
            }  
      
            public long getItemId(int pos) {  
                return pos;  
            }  
      
            public View getView(int pos, View v, ViewGroup p) {  
                TextView view = new TextView(MainActivity.this);  
                view.setText("阿福播放器 " + pos);  
                Log.i(TAG, "entry: " + pos);  
                view.setTextSize(20f);  
                view.setHeight(80);  
                return view;  
            }  
        }  
    }  

 
 

 

单击按钮直接加载

    package com.yangguangfu.listview;  
      
      
    import android.app.ListActivity;  
    import android.os.Bundle;  
    import android.util.Log;  
    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.ListView;  
    import android.widget.TextView;  
    import android.widget.LinearLayout.LayoutParams;  
    /** 
     *  
     * @author 阿福 
     * 
     */  
    public class ButtonLoadingActivity extends ListActivity    {  
        private static final String TAG = "ButtonLoadingActivity";  
             
        private  listViewAdapter adapter = new listViewAdapter();  
        /** 
         * 设置布局显示为目标有多大就多大 
         */  
        private LayoutParams WClayoutParams =new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);  
        /** 
         * 设置布局显示目标最大化 
         */  
        private LayoutParams FFlayoutParams =new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.FILL_PARENT);  
          
        protected void onCreate(Bundle savedInstanceState) {  
                super.onCreate(savedInstanceState);  
                 Log.i(TAG, "onCreate(Bundle savedInstanceState):" );  
                  LinearLayout layout = new LinearLayout(this);  
                  layout.setOrientation(LinearLayout.HORIZONTAL);  
                   
                  Button button = new Button(this);  
                  button.setText("点击加载下五条...");  
                  button.setGravity(Gravity.CENTER_VERTICAL);  
                     
                  layout.addView(button,FFlayoutParams);  
                  layout.setGravity(Gravity.CENTER);  
                  LinearLayout loadingLayout = new LinearLayout(this);  
                  loadingLayout.addView(layout,WClayoutParams);  
                  loadingLayout.setGravity(Gravity.CENTER);  
                     
                     
                  ListView listView = getListView();  
                     
                  listView.addFooterView(loadingLayout);  
                     
                  button.setOnClickListener(new Button.OnClickListener()     
                  {         @Override        
                     public void onClick(View v)    
                  {           
                      adapter.count += 5;    
                      Log.i(TAG, "setOnClickListener:" +  adapter.count);  
                      adapter.notifyDataSetChanged();  
                      }        
                  });    
                   
              setListAdapter(adapter);    
         }  
      
      
        public void onScrollStateChanged(AbsListView v, int s) {  
             Log.i(TAG, "onScrollStateChanged(AbsListView v, int s)");  
        }       
      
        class listViewAdapter extends BaseAdapter {  
            int count = 10; /* 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 textView = new TextView(ButtonLoadingActivity.this);  
                     textView.setHeight(80);  
                     textView.setTextSize(20);  
                     textView.setText("阿福播放器 " + pos);  
                     Log.i(TAG, "getView:pos:" + pos);  
                    return textView;  
             }  
         }  
      
      
      
    }