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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分頁效果圖：

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Xml代碼 ?

?<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>??

?

Java代碼 ?

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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