Android基于ListView实现类似Market分页加载效果示例

本文实例讲述了Android基于ListView实现类似Market分页加载效果。分享给大家供大家参考，具体如下：

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.java

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.xml

<?xml version="1.0" encoding="utf-8"?>

更多关于Android相关内容感兴趣的读者可查看本站专题：《Android视图View技巧总结》、《Android布局layout技巧总结》、《Android图形与图像处理技巧总结》、《Android开发入门与进阶教程》、《Android调试技巧与常见问题解决方法汇总》、《Android多媒体操作技巧汇总(音频,视频,录音等)》、《Android基本组件用法总结》及《Android控件用法总结》

希望本文所述对大家Android程序设计有所帮助。

更多相关文章

随机推荐