金麟岂是池中物侯和何:ListView 实现像Android Market那样 分页加载 滚动加载

ListView 实现像Android Market那样 分页加载 滚动加载 2011-03-22 18:18:00标签：android ListView 分页加载 Market 滚动加载 ListView 实现像Android Market那样 分页加载 滚动加载 收藏
 最近几天研究ListView实现分页加载和滚动加载,发现可以用listView的OnScroll方法来实现,直接上代码ListViewScroll.javaview plaincopy to clipboardprint?
package zy.lucifer.ListViewScroll; 
import android.app.Activity; 
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.Toast; 
import android.widget.AbsListView.OnScrollListener; 
import android.widget.LinearLayout.LayoutParams; 
public class ListViewScroll extends Activity { 
    /** Called when the activity is first created. */ 
    private LayoutParams mLayoutParams = new LinearLayout.LayoutParams( 
            LinearLayout.LayoutParams.WRAP_CONTENT, 
            LinearLayout.LayoutParams.WRAP_CONTENT); 
    /**
     * 设置布局显示目标最大化属性
     */ 
    private LayoutParams FFlayoutParams = new LinearLayout.LayoutParams( 
            LinearLayout.LayoutParams.FILL_PARENT, 
            LinearLayout.LayoutParams.FILL_PARENT); 
    ListView listView ; 
    private int lastItem = 0; 
    LinearLayout loadingLayout; 
    private listViewAdapter adapter; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.main); 
        listView = (ListView) findViewById(R.id.myList); 
         
        Log.i("test", "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 progressBar = new ProgressBar(this); 
        // 进度条显示位置 
        progressBar.setPadding(0, 0, 15, 0); 
        // 把进度条加入到layout中 
        layout.addView(progressBar, mLayoutParams); 
        // 文本内容 
        TextView textView = new TextView(this); 
        textView.setText("加载中..."); 
        textView.setGravity(Gravity.CENTER_VERTICAL); 
        // 把文本加入到layout中 
        layout.addView(textView, FFlayoutParams); 
        // 设置layout的重力方向，即对齐方式是 
        layout.setGravity(Gravity.CENTER); 
        // 设置ListView的页脚layout 
        loadingLayout = new LinearLayout(this); 
        loadingLayout.addView(layout, mLayoutParams); 
        loadingLayout.setGravity(Gravity.CENTER); 
        listView.addFooterView(loadingLayout); 
        adapter = new listViewAdapter(); 
        listView.setAdapter(adapter); 
        listView.setOnScrollListener(new OnScrollListener() { 
  
            @Override 
            public void onScroll(AbsListView view, int firstVisibleItem, 
                    int visibleItemCount, int totalItemCount) { 
                // TODO Auto-generated method stub 
                Log.i("test" , "Scroll>>>first: " + firstVisibleItem + ", visible: " + visibleItemCount + ", total: " + totalItemCount); 
                lastItem = firstVisibleItem + visibleItemCount - 1; 
                Log.i("test" , "Scroll>>>lastItem:" + lastItem); 
                //显示50条ListItem，即0-49，因为onScroll是在“滑动”执行过之后才触发，所以用adapter.count<=41作条件 
                int scrolllength=101; 
                if (adapter.count<=scrolllength) { 
                    if (firstVisibleItem+visibleItemCount==totalItemCount) { 
                        adapter.count += 10; 
                        adapter.notifyDataSetChanged(); 
                        listView.setSelection(lastItem); 
                        int currentPage=adapter.count/10; 
                        Toast.makeText(getApplicationContext(), "第"+currentPage+"页", Toast.LENGTH_LONG).show(); 
                    } 
                } 
                else { 
                     listView.removeFooterView(loadingLayout);  
                } 
            } 
            @Override 
            public void onScrollStateChanged(AbsListView view, int scrollState) { 
                // TODO Auto-generated method stub 
            } 
        }); 
    } 
    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) { 
            Log.i("test", "getView>>>pos:" + pos); 
            TextView view; 
            if (v == null) { 
                view = new TextView(ListViewScroll.this); 
            } else { 
                view = (TextView) v; 
            } 
            view.setText("ListItem " + pos); 
            view.setTextSize(20f); 
            view.setGravity(Gravity.CENTER); 
            view.setHeight(60); 
            return view; 
             
        } 
    } 
} 
main.xmlview plaincopy to clipboardprint?
 
http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 
android:layout_width="fill_parent" android:layout_height="fill_parent" 
        >