Android: BaseAdapter 实现分页
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Android: BaseAdapter 实现分页
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小記記代碼 ? ?列表的顯示需要三個元素：?? 1．ListVeiw?用來展示列表的View。?? 2．適配器?用來把數據映射到ListView上的中介。?? 3．數據????具體的將被映射的字符串，圖片，或者基本組件。?? ?? 根據列表的適配器類型，列表分為三種，ArrayAdapter，SimpleAdapter和SimpleCursorAdapter?? ?? 其中以ArrayAdapter最為簡單，只能展示一行字。?? ?? SimpleAdapter有最好的擴充性，可以自定義出各種效果。??? ?? SimpleCursorAdapter可以認為是SimpleAdapter對數據庫的簡單結合，可以方便的把數據庫的內容以列表的形式展示出來。??
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?<ListView??android:id="@+id/list"?? ?????android:layout_width="fill_parent"??? ?????android:layout_height="wrap_content"??/>?? ?? lt;LinearLayout?xmlns:android="http://schemas.android.com/apk/res/android"?? android:orientation="horizontal"?android:layout_width="fill_parent"?? android:layout_height="wrap_content"?android:gravity="bottom">?? ?? ?<Button??android:id="@+id/btnLeft"?? ?????android:layout_width="150dip"??? ?????android:layout_height="wrap_content"??? ?????android:text="Previous?Page"?/>?? ??????? ?<Button??android:id="@+id/btnRight"?? ?????android:layout_width="150dip"??? ?????android:layout_height="wrap_content"??? ?????android:text="Next?Page"?/>?? </LinearLayout>??
import?android.app.Activity;?? import?android.os.Bundle;?? import?android.view.Gravity;?? import?android.view.View;?? import?android.view.ViewGroup;?? import?android.widget.BaseAdapter;?? import?android.widget.Button;?? import?android.widget.ListView;?? import?android.widget.TextView;?? ?? public?class?listMoreTest?extends?Activity?{?? ?????? ????int?VIEW_COUNT?=?10;?? ????int?index?=?0;?? ?????? ????ListView?listView;?? ????Button?btnLeft,?btnRight;?? ????View.OnClickListener?clickListener;?? ????MyAdapter?myAdapter;?? ????String[]?data?=?{?"0",?"1",?"2",?"3",?"4",?"5",?"6",?"7",?"8",?"9",?"10",?? ????????????"11",?"12",?"13",?"14",?"15",?"16",?"17",?"18",?"19",?"20",?"21",?? ????????????"22",?"23",?"24",?"25",?"26",?"27",?"28",?"29",?"30",?"31",?"32",?? ????????????"33",?"34",?"35",?"36",?"37"?};?? ?? ????@Override?? ????public?void?onCreate(Bundle?savedInstanceState)?{?? ????????super.onCreate(savedInstanceState);?? ????????setContentView(R.layout.listview);?? ?? ????????initView();?? ?? ????????//?設置ListView的Adapter?? ????????myAdapter?=?new?MyAdapter(this);?? ????????//?TODO?此處是雙向綁定嗎？?? ????????listView.setAdapter(myAdapter);?? ?? ????????clickListener?=?new?Button.OnClickListener()?{?? ????????????@Override?? ????????????public?void?onClick(View?v)?{?? ????????????????switch?(v.getId())?{?? ????????????????case?R.id.btnLeft:?? ????????????????????leftView();?? ????????????????????break;?? ????????????????case?R.id.btnRight:?? ????????????????????rightView();?? ????????????????????break;?? ????????????????}?? ????????????}?? ????????};?? ????????btnLeft.setOnClickListener(clickListener);?? ????????btnRight.setOnClickListener(clickListener);?? ?? ????????changeButtonStatus();?? ????}?? ?? ????public?void?initView()?{?? ????????listView?=?(ListView)?findViewById(R.id.list);?? ????????btnLeft?=?(Button)?findViewById(R.id.btnLeft);?? ????????btnRight?=?(Button)?findViewById(R.id.btnRight);?? ????}?? ?? ????/**? ?????*?點擊左邊的Button，表示向前翻頁，索引值要減1.? ?????*/?? ????public?void?leftView()?{?? ????????index--;?? ????????//?刷新ListView里面的數值。?? ????????myAdapter.notifyDataSetChanged();?? ????????changeButtonStatus();?? ????}?? ?? ????/**? ?????*?點擊右邊的Button，表示向后翻頁，索引值要加1.? ?????*/?? ????public?void?rightView()?{?? ????????index++;?? ????????//?刷新ListView里面的數值。?? ????????myAdapter.notifyDataSetChanged();?? ????????changeButtonStatus();?? ????}?? ?? ????/**? ?????*?變更btnLeft與btnRight按鈕是否可用。? ?????*/?? ????public?void?changeButtonStatus()?{?? ????????if?(index?<=?0)?{?? ????????????btnLeft.setEnabled(false);?? ????????}?else?if?(data.length?-?index?*?VIEW_COUNT?<=?VIEW_COUNT)?{?? ????????????btnRight.setEnabled(false);?? ????????}?else?{?? ????????????btnLeft.setEnabled(true);?? ????????????btnRight.setEnabled(true);?? ????????}?? ????}?? ?? ????//?ListView的Adapter，這個是關鍵的導致可以分頁的根本原因。?? ????public?class?MyAdapter?extends?BaseAdapter?{?? ????????Activity?activity;?? ?? ????????public?MyAdapter(Activity?a)?{?? ????????????activity?=?a;?? ????????}?? ?? ????????/**? ?????????*?設置每一頁的長度，默認的是View_Count的值。? ?????????*/?? ????????@Override?? ????????public?int?getCount()?{?? ????????????//?ori表示到目前為止的前幾頁的總共的個數。?? ????????????int?ori?=?VIEW_COUNT?*?index;?? ?? ????????????if?(data.length?-?ori?<?VIEW_COUNT)?{?? ????????????????return?data.length?-?ori;?? ????????????}?else?{?? ????????????????return?VIEW_COUNT;?? ????????????}?? ????????}?? ?????????? ????????/**? ?????????*?顯示TextView?data。? ?????????*/?? ????????@Override?? ????????public?View?getView(int?position,?View?convertView,?ViewGroup?parent)?{?? ????????????//?return?addTestView(position);?? ????????????TextView?textView?=?new?TextView(activity);?? ????????????textView.setGravity(Gravity.LEFT);?? ????????????textView.setText(data[position?+?index?*?VIEW_COUNT]);?? ????????????return?textView;?? ????????}?? ?? ????????@Override?? ????????public?Object?getItem(int?position)?{?? ????????????return?position;?? ????????}?? ?? ????????@Override?? ????????public?long?getItemId(int?position)?{?? ????????????return?position;?? ????????}?? ????}?? }?
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分頁效果圖：
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Xml代碼 ??
Java代碼 ?總結
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