listView的分页滑动

1.         ListView分页加载实现思路

实现OnScrollListener 接口重写onScrollStateChanged 和onScroll方法，使用onscroll方法实现”滑动“后处理检查是否还有新的记录，如果有，调用 addFooterView，添加记录到adapter, adapter调用 notifyDataSetChanged 更新数据;如果没有记录了，把自定义的mFooterView去掉。使用onScrollStateChanged可以检测是否滚到最后一行且停止滚动然后执行加载。

 1 [java] view plaincopyprint?

 2 import android.app.ListActivity;  

 3 import android.os.Bundle;  

 4 import android.os.Handler;  

 5 import android.view.Gravity;  

 6 import android.view.View;  

 7 import android.view.ViewGroup;  

 8 import android.widget.AbsListView;  

 9 import android.widget.BaseAdapter;  

10 import android.widget.ImageView;  

11 import android.widget.LinearLayout;  

12 import android.widget.ProgressBar;  

13 import android.widget.TextView;  

14 import android.widget.AbsListView.OnScrollListener;  

15 import android.widget.LinearLayout.LayoutParams;  

16 public class Test extends ListActivity implements OnScrollListener {  

17     Aleph0 adapter = new Aleph0();  

18     int lastItem = 0;  

19     int mProgressStatus = 0;  

20     private Handler mHandler = new Handler();  

21     ProgressBar progressBar;  

22     protected void onCreate(Bundle savedInstanceState) {  

23         super.onCreate(savedInstanceState);  

24    LinearLayout searchLayout = new LinearLayout(this);  

25    searchLayout.setOrientation(LinearLayout.HORIZONTAL);  

26          progressBar = new ProgressBar(this);  

27          progressBar.setPadding(0, 0, 15, 0);  

28          searchLayout.addView(progressBar,new LinearLayout.LayoutParams(  

29            LinearLayout.LayoutParams.WRAP_CONTENT,  

30            LinearLayout.LayoutParams.WRAP_CONTENT  

31          ));  

32          TextView textView = new TextView(this);  

33          textView.setText("加载中...");  

34          textView.setGravity(Gravity.CENTER_VERTICAL);  

35          searchLayout.addView(textView,new LinearLayout.LayoutParams(  

36            LinearLayout.LayoutParams.FILL_PARENT,  

37            LinearLayout.LayoutParams.FILL_PARENT  

38          ));  

39          searchLayout.setGravity(Gravity.CENTER);  

40          LinearLayout loadingLayout = new LinearLayout(this);  

41          loadingLayout.addView(searchLayout,new LinearLayout.LayoutParams(  

42            LinearLayout.LayoutParams.WRAP_CONTENT,  

43            LinearLayout.LayoutParams.WRAP_CONTENT  

44          ));  

45          loadingLayout.setGravity(Gravity.CENTER);  

46         getListView().addFooterView(loadingLayout);  

47         // Start lengthy operation in a background thread  

48 //        new Thread(new Runnable() {  

49 //            public void run() {  

50 //                while (mProgressStatus < 100) {  

51 //  

52 //                    // Update the progress bar  

53 //                    mHandler.post(new Runnable() {  

54 //                        public void run() {  

55 //                        progressBar.setProgress(mProgressStatus);  

56 //                        }  

57 //                    });  

58 //                }  

59 //            }  

60 //        }).start();  

61         registerForContextMenu(getListView());  

62         setListAdapter(adapter);  

63         getListView().setOnScrollListener(this);  

64     }  

65     public void onScroll(AbsListView v, int firstVisibleItem, int visibleItemCount, int totalItemCount) {   

66         lastItem = firstVisibleItem + visibleItemCount - 1 ;  

67         System.out.println("lastItem:" + lastItem);  

68     }  

69     public void onScrollStateChanged(AbsListView v, int state) {  

70     if(lastItem == adapter.count && state == OnScrollListener.SCROLL_STATE_IDLE){  

71           adapter.count += 10;  

72           adapter.notifyDataSetChanged();  

73     }  

74 //        if(state == OnScrollListener.SCROLL_STATE_IDLE ) {  

75 //                adapter.count += 10;  

76 //                adapter.notifyDataSetChanged();  

77 //        }  

78     }  

79     class Aleph0 extends BaseAdapter {  

80         int count = 10;  

81         public int getCount() { return count; }  

82         public Object getItem(int pos) { return pos; }  

83         public long getItemId(int pos) { return pos; }  

84         public View getView(int pos, View v, ViewGroup p) {  

85                 TextView view = new TextView(Test.this);  

86                 view.setText("entry " + pos);  

87                 view.setHeight(90);  

88                 return view;  

89         }  

90     }  

91 }  

 

 

第二种。

  1 package com.notice.moredate;

  2 

  3 import java.util.ArrayList;

  4 import java.util.HashMap;

  5 

  6 import android.app.Activity;

  7 import android.os.Bundle;

  8 import android.os.Handler;

  9 import android.view.View;

 10 import android.view.View.OnClickListener;

 11 import android.widget.AbsListView;

 12 import android.widget.AbsListView.OnScrollListener;

 13 import android.widget.Button;

 14 import android.widget.ListView;

 15 import android.widget.ProgressBar;

 16 import android.widget.SimpleAdapter;

 17 import android.widget.Toast;

 18 

 19 public class MoreDateListActivity extends Activity implements OnScrollListener {

 20     

 21     // ListView的Adapter

 22     private SimpleAdapter mSimpleAdapter;

 23     private ListView lv;

 24     private Button bt;

 25     private ProgressBar pg;

 26     private ArrayList<HashMap<String,String>> list;

 27     // ListView底部View

 28     private View moreView;

 29     private Handler handler;

 30     // 设置一个最大的数据条数，超过即不再加载

 31     private int MaxDateNum;

 32     // 最后可见条目的索引

 33     private int lastVisibleIndex;

 34     

 35     /** Called when the activity is first created. */

 36     @Override

 37     public void onCreate(Bundle savedInstanceState) {

 38         super.onCreate(savedInstanceState);

 39         setContentView(R.layout.main);

 40         

 41         

 42         MaxDateNum = 22; // 设置最大数据条数

 43 

 44         lv = (ListView) findViewById(R.id.lv);

 45 

 46         // 实例化底部布局

 47         moreView = getLayoutInflater().inflate(R.layout.moredate, null);

 48 

 49         bt = (Button) moreView.findViewById(R.id.bt_load);

 50         pg = (ProgressBar) moreView.findViewById(R.id.pg);

 51         handler = new Handler();

 52 

 53         // 用map来装载数据，初始化10条数据

 54         list = new ArrayList<HashMap<String,String>>();

 55         for (int i = 0; i < 10; i++) {

 56             HashMap<String, String> map = new HashMap<String, String>();

 57             map.put("ItemTitle", "第" + i + "行标题");

 58             map.put("ItemText", "第" + i + "行内容");

 59             list.add(map);

 60         }

 61         // 实例化SimpleAdapter

 62         mSimpleAdapter = new SimpleAdapter(this, list, R.layout.item,

 63                 new String[] { "ItemTitle", "ItemText" },

 64                 new int[] { R.id.tv_title, R.id.tv_content });

 65         // 加上底部View，注意要放在setAdapter方法前

 66         lv.addFooterView(moreView);

 67         lv.setAdapter(mSimpleAdapter);

 68         // 绑定监听器

 69         lv.setOnScrollListener(this);

 70 

 71         bt.setOnClickListener(new OnClickListener() {

 72 

 73             @Override

 74             public void onClick(View v) {

 75                 pg.setVisibility(View.VISIBLE);// 将进度条可见

 76                 bt.setVisibility(View.GONE);// 按钮不可见

 77 

 78                 handler.postDelayed(new Runnable() {

 79 

 80                     @Override

 81                     public void run() {

 82                         loadMoreDate();// 加载更多数据

 83                         bt.setVisibility(View.VISIBLE);

 84                         pg.setVisibility(View.GONE);

 85                         mSimpleAdapter.notifyDataSetChanged();// 通知listView刷新数据

 86                     }

 87 

 88                 }, 2000);

 89             }

 90         });

 91 

 92     }

 93 

 94     private void loadMoreDate() {

 95         int count = mSimpleAdapter.getCount();

 96         if (count + 5 < MaxDateNum) {

 97             // 每次加载5条

 98             for (int i = count; i < count + 5; i++) {

 99                 HashMap<String, String> map = new HashMap<String, String>();

100                 map.put("ItemTitle", "新增第" + i + "行标题");

101                 map.put("ItemText", "新增第" + i + "行内容");

102                 list.add(map);

103             }

104         } else {

105             // 数据已经不足5条

106             for (int i = count; i < MaxDateNum; i++) {

107                 HashMap<String, String> map = new HashMap<String, String>();

108                 map.put("ItemTitle", "新增第" + i + "行标题");

109                 map.put("ItemText", "新增第" + i + "行内容");

110                 list.add(map);

111             }

112         }

113 

114     }

115 

116     @Override

117     public void onScroll(AbsListView view, int firstVisibleItem,

118             int visibleItemCount, int totalItemCount) {

119         // 计算最后可见条目的索引

120         lastVisibleIndex = firstVisibleItem + visibleItemCount - 1;

121 

122         // 所有的条目已经和最大条数相等，则移除底部的View

123         if (totalItemCount == MaxDateNum + 1) {

124             lv.removeFooterView(moreView);

125             Toast.makeText(this, "数据全部加载完成，没有更多数据！", Toast.LENGTH_LONG).show();

126         }

127 

128     }

129 

130     @Override

131     public void onScrollStateChanged(AbsListView view, int scrollState) {

132         // 滑到底部后自动加载，判断listview已经停止滚动并且最后可视的条目等于adapter的条目

133         if (scrollState == OnScrollListener.SCROLL_STATE_IDLE

134                 && lastVisibleIndex == mSimpleAdapter.getCount()) {

135             // 当滑到底部时自动加载

136             // pg.setVisibility(View.VISIBLE);

137             // bt.setVisibility(View.GONE);

138             // handler.postDelayed(new Runnable() {

139             //

140             // @Override

141             // public void run() {

142             // loadMoreDate();

143             // bt.setVisibility(View.VISIBLE);

144             // pg.setVisibility(View.GONE);

145             // mSimpleAdapter.notifyDataSetChanged();

146             // }

147             //

148             // }, 2000);

149 

150         }

151 

152     }

153     

154 }