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ListView分页

 
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  1. packagehbq.android.myapp.listview;
  3. importandroid.app.ListActivity;
  4. importandroid.os.Bundle;
  5. importandroid.util.Log;
  6. importandroid.view.Gravity;
  7. importandroid.view.View;
  8. importandroid.view.ViewGroup;
  9. importandroid.widget.AbsListView;
  10. importandroid.widget.BaseAdapter;
  11. importandroid.widget.LinearLayout;
  12. importandroid.widget.ListView;
  13. importandroid.widget.ProgressBar;
  14. importandroid.widget.TextView;
  15. importandroid.widget.Toast;
  16. importandroid.widget.AbsListView.OnScrollListener;
  17. importandroid.widget.LinearLayout.LayoutParams;
  19. publicclassMainActivityextendsListActivityimplementsOnScrollListener{
  20. privatestaticfinalStringTAG="MainActivity";
  22. privateListViewAdapteradapter=newListViewAdapter();
  23. ListViewlistView;
  24. privateintlastItem=0;
  25. LinearLayoutloadingLayout;
  26. /**
  27. *设置布局显示属性
  28. */
  29. privateLayoutParamsmLayoutParams=newLinearLayout.LayoutParams(
  30. LinearLayout.LayoutParams.WRAP_CONTENT,
  31. LinearLayout.LayoutParams.WRAP_CONTENT);
  32. /**
  33. *设置布局显示目标最大化属性
  34. */
  35. privateLayoutParamsFFlayoutParams=newLinearLayout.LayoutParams(
  36. LinearLayout.LayoutParams.FILL_PARENT,
  37. LinearLayout.LayoutParams.FILL_PARENT);
  39. privateProgressBarprogressBar;
  41. @Override
  42. protectedvoidonCreate(BundlesavedInstanceState){
  43. super.onCreate(savedInstanceState);
  45. Log.i(TAG,"onCreate(BundlesavedInstanceState)>>>>>>>>>>>>>>>");
  46. //线性布局
  47. LinearLayoutlayout=newLinearLayout(this);
  48. //设置布局水平方向
  49. layout.setOrientation(LinearLayout.HORIZONTAL);
  50. //进度条
  51. progressBar=newProgressBar(this);
  52. //进度条显示位置
  53. progressBar.setPadding(0,0,15,0);
  54. //把进度条加入到layout中
  55. layout.addView(progressBar,mLayoutParams);
  56. //文本内容
  57. TextViewtextView=newTextView(this);
  58. textView.setText("加载中...");
  59. textView.setGravity(Gravity.CENTER_VERTICAL);
  60. //把文本加入到layout中
  61. layout.addView(textView,FFlayoutParams);
  62. //设置layout的重力方向,即对齐方式是
  63. layout.setGravity(Gravity.CENTER);
  65. //设置ListView的页脚layout
  66. loadingLayout=newLinearLayout(this);
  67. loadingLayout.addView(layout,mLayoutParams);
  68. loadingLayout.setGravity(Gravity.CENTER);
  70. //得到一个ListView用来显示条目
  71. listView=getListView();
  72. //添加到脚页显示
  73. listView.addFooterView(loadingLayout);
  74. //给ListView添加适配器
  75. setListAdapter(adapter);
  76. //给ListView注册滚动监听
  77. listView.setOnScrollListener(this);
  78. }
  80. @Override
  81. publicvoidonScroll(AbsListViewv,intfirstVisibleItem,
  82. intvisibleItemCount,inttotalItemCount){
  83. Log.i(TAG,"Scroll>>>first:"+firstVisibleItem+",visible:"
  84. +visibleItemCount+",total:"+totalItemCount);
  85. lastItem=firstVisibleItem+visibleItemCount-1;
  86. Log.i(TAG,"Scroll>>>lastItem:"+lastItem);
  87. //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
  88. if(adapter.count<=41){
  89. if(firstVisibleItem+visibleItemCount==totalItemCount){
  90. adapter.count+=10;
  91. adapter.notifyDataSetChanged();
  92. listView.setSelection(lastItem);
  93. intcurrentPage=adapter.count/10;
  94. Toast.makeText(getApplicationContext(),
  95. "第"+currentPage+"页",Toast.LENGTH_LONG).show();
  96. }
  97. }else{
  98. listView.removeFooterView(loadingLayout);
  99. }
  101. }
  103. @Override
  104. publicvoidonScrollStateChanged(AbsListViewv,intstate){
  105. if(lastItem==adapter.count
  106. &&state==OnScrollListener.SCROLL_STATE_IDLE){
  107. Log.i(TAG,"ScrollStateChanged>>>state:"+state+"lastItem:"
  108. +lastItem);
  109. //显示50条ListItem,即0-49,因为onScrollStateChanged是在“拖动滑动”执行过之后才触发,所以用adapter.count<=41作条件
  110. if(adapter.count<=41){
  111. adapter.count+=10;
  112. adapter.notifyDataSetChanged();
  113. }
  115. }
  116. }
  118. /**
  119. *要用用于生成显示数据
  120. *
  121. */
  122. classListViewAdapterextendsBaseAdapter{
  123. intcount=10;
  125. publicintgetCount(){
  126. Log.i(TAG,"getCount>>>count:"+count);
  127. returncount;
  128. }
  130. publicObjectgetItem(intpos){
  131. Log.i(TAG,"getItem>>>pos:"+pos);
  132. returnpos;
  133. }
  135. publiclonggetItemId(intpos){
  136. Log.i(TAG,"getItemId>>>ItemId:"+pos);
  137. returnpos;
  138. }
  140. publicViewgetView(intpos,Viewv,ViewGroupp){
  141. Log.i(TAG,"getView>>>pos:"+pos);
  142. TextViewview;
  143. if(v==null){
  144. view=newTextView(MainActivity.this);
  145. }else{
  146. view=(TextView)v;
  147. }
  148. view.setText("ListItem"+pos);
  149. view.setTextSize(20f);
  150. view.setGravity(Gravity.CENTER);
  151. view.setHeight(60);
  152. returnview;
  153. }
  154. }
  155. }





Java代码 收藏代码
  1. packagehbq.android.myapp.listview;
  3. importandroid.app.ListActivity;
  4. importandroid.os.Bundle;
  5. importandroid.util.Log;
  6. importandroid.view.Gravity;
  7. importandroid.view.View;
  8. importandroid.view.ViewGroup;
  9. importandroid.widget.BaseAdapter;
  10. importandroid.widget.Button;
  11. importandroid.widget.LinearLayout;
  12. importandroid.widget.ListView;
  13. importandroid.widget.TextView;
  14. importandroid.widget.Toast;
  15. importandroid.widget.LinearLayout.LayoutParams;
  17. publicclassButtonLoadingActivityextendsListActivity{
  18. privatestaticfinalStringTAG="ButtonLoadingActivity";
  20. privateListViewAdapteradapter=newListViewAdapter();
  21. privateListViewlistView;
  22. /**
  23. *设置布局显示的属性
  24. */
  25. privateLayoutParamsmLayoutParams=newLinearLayout.LayoutParams(
  26. LinearLayout.LayoutParams.WRAP_CONTENT,
  27. LinearLayout.LayoutParams.WRAP_CONTENT);
  28. /**
  29. *设置布局显示目标最大化属性
  30. */
  31. privateLayoutParamsFFlayoutParams=newLinearLayout.LayoutParams(
  32. LinearLayout.LayoutParams.FILL_PARENT,
  33. LinearLayout.LayoutParams.FILL_PARENT);
  35. protectedvoidonCreate(BundlesavedInstanceState){
  36. super.onCreate(savedInstanceState);
  37. Log.i(TAG,"onCreate(BundlesavedInstanceState)>>>>>>>>>>>>>>>");
  38. LinearLayoutlayout=newLinearLayout(this);
  39. layout.setOrientation(LinearLayout.HORIZONTAL);
  41. Buttonbutton=newButton(this);
  42. button.setText("点击加载下10条...");
  43. button.setGravity(Gravity.CENTER_VERTICAL);
  45. layout.addView(button,FFlayoutParams);
  46. layout.setGravity(Gravity.CENTER);
  47. LinearLayoutloadingLayout=newLinearLayout(this);
  48. loadingLayout.addView(layout,mLayoutParams);
  49. loadingLayout.setGravity(Gravity.CENTER);
  51. listView=getListView();
  53. listView.addFooterView(loadingLayout);
  55. button.setOnClickListener(newButton.OnClickListener(){
  56. @Override
  57. publicvoidonClick(Viewv){
  58. adapter.count+=10;
  59. Log.i(TAG,"setOnClickListener:"+adapter.count);
  60. adapter.notifyDataSetChanged();
  61. intcurrentPage=adapter.count/10;
  62. Toast.makeText(getApplicationContext(),
  63. "第"+currentPage+"页",Toast.LENGTH_LONG).show();
  64. }
  65. });
  67. setListAdapter(adapter);
  68. }
  70. classListViewAdapterextendsBaseAdapter{
  71. intcount=10;/*startingamount*/
  73. publicintgetCount(){
  74. returncount;
  75. }
  77. publicObjectgetItem(intpos){
  78. returnpos;
  79. }
  81. publiclonggetItemId(intpos){
  82. returnpos;
  83. }
  85. publicViewgetView(intpos,Viewv,ViewGroupp){
  86. Log.i(TAG,"getView>>>pos:"+pos);
  87. TextViewview;
  88. if(v==null){
  89. view=newTextView(ButtonLoadingActivity.this);
  90. }else{
  91. view=(TextView)v;
  92. }
  93. view.setText("ListItem"+pos);
  94. view.setTextSize(20f);
  95. view.setGravity(Gravity.CENTER);
  96. view.setHeight(60);
  97. returnview;
  98. }
  99. }
  101. }



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| android 中listview滑动加载的简单demo
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