编写自己的Adapter模板

如果你项目一直用系统给你封装的BaseAdapter的话，那么我只想说，你不累么？
代码繁多还要写数据缓存，还不如自己动手写一个模板吧，这样后面项目就可以直接套用了，编写和执行效率大大提升啊。
BaseAdapter.java

001	import java.util.ArrayList;

002	import java.util.Collection;

003	import java.util.Collections;

004	import java.util.Comparator;

005	import java.util.List;

006

007	import android.content.Context;

008	import android.content.res.Resources;

009	import android.view.LayoutInflater;

010	import android.view.View;

011	import android.view.ViewGroup;

012

013

014

/**

015	* 实现这个适配器模板会少很多代码

016	* @author leehom

017	* @param <T>

018

*/

019	public abstract class BaseAdapter<T> extends android.widget.BaseAdapter {

020

021	protected List<T> list;

022	protected Context context;

023	protected LayoutInflater inflater;

024	private int layoutID;

025

026	public BaseAdapter(Context context, T[] ts, int layoutID) {

027

super();

028	this.context = context;

029	this.list = new ArrayList<T>();

030	this.layoutID = layoutID;

031	Collections.addAll(list, ts);

032	this.inflater = LayoutInflater.from(context);

033

}

034

035	public BaseAdapter(Context context, List<T> list, int layoutID) {

036

super();

037	this.layoutID = layoutID;

038	this.context = context;

039	this.list = new ArrayList<T>();

040	this.list.addAll(list);

041	this.inflater = LayoutInflater.from(context);

042

}

043

044	public Resources getResources() {

045	return context.getResources();

046

}

047

048	public synchronized void add(T object) {

049	list.add(object);

050

}

051

052	public synchronized void addAll(Collection<? extends T> collection) {

053	list.addAll(collection);

054

}

055

056	public synchronized void remove(T object) {

057	list.remove(object);

058

}

059

060	public synchronized void insert(T object, int index) {

061	list.add(index, object);

062

}

063

064	public synchronized void clear() {

065	list.clear();

066

}

067

068	public synchronized void sort(Comparator<? super T> comparator) {

069	Collections.sort(list, comparator);

070

}

071

072

@Override

073	public T getItem(int position) {

074	// TODO Auto-generated method stub

075	return list.get(position);

076

}

077

078

@Override

079	public int getCount() {

080	// TODO Auto-generated method stub

081	return list.size();

082

}

083

084

@Override

085	public long getItemId(int position) {

086	// TODO Auto-generated method stub

087	return position;

088

}

089

090

@Override

091	public View getView(int position, View convertView, ViewGroup parent) {

092	// TODO Auto-generated method stub

093	ViewHolder holder = null;

094	if (convertView == null) {

095	convertView = inflater.inflate(layoutID, null);

096	holder = new ViewHolder(convertView);

097	initView(holder);

098	convertView.setTag(holder);

099

} else {

100	holder = (ViewHolder) convertView.getTag();

101

}

102	setViewValue(holder, position);

103	return convertView;

104

}

105

106	public List<T> getList() {

107	return list;

108

}

109

110

/**

111	* 向ViewHolder类里面添加View

112	* @param holder

113

*/

114	public abstract void initView(ViewHolder holder);

115

116

/**

117	* 从ViewHolder获取对应ID的View设置其值

118	* @param holder

119	* @param t 数据对象

120

*/

121	public abstract void setViewValue(ViewHolder holder, int position);

122

123

}

用的时候也是继承它，然后只需要初始化ID和设置Value就行了。例：

01	import java.lang.reflect.Field;

02	import java.lang.reflect.InvocationTargetException;

03	import java.lang.reflect.Method;

04	import java.util.ArrayList;

05

06	import android.annotation.SuppressLint;

07	import android.content.Context;

08

09	import com.fenjin.app.humiture.R;

10	import com.fenjin.app.item.DefaultItem;

11

12	@SuppressLint("DefaultLocale")

13	public class DefaultAdapter extends BaseAdapter<DefaultItem> {

14

15	public DefaultAdapter(Context context, Object object) {

16	super(context, new ArrayList<DefaultItem>(),

17	R.layout.default_list_item_layout);

18	// TODO Auto-generated constructor stub

19

try {

20	Field[] fields = object.getClass().getDeclaredFields();

21	for (Field field : fields) {

22	String lable = field.getName();

23	String firstWord = lable.substring(0, 1).toUpperCase();

24	StringBuffer buffer = new StringBuffer("get");

25	buffer.append(firstWord);

26	buffer.append(lable.substring(1));

27	String name = buffer.toString();

28	Method method = object.getClass().getDeclaredMethod(name);

29	String value = method.invoke(object).toString();

30	DefaultItem item = new DefaultItem(lable, value);

31	add(item);

32

}

33	} catch (IllegalArgumentException e) {

34	// TODO Auto-generated catch block

35	e.printStackTrace();

36	} catch (NoSuchMethodException e) {

37	// TODO Auto-generated catch block

38	e.printStackTrace();

39	} catch (IllegalAccessException e) {

40	// TODO Auto-generated catch block

41	e.printStackTrace();

42	} catch (InvocationTargetException e) {

43	// TODO Auto-generated catch block

44	e.printStackTrace();

45

}

46

}

47

48

@Override

49	public void initView(ViewHolder holder) {

50	// TODO Auto-generated method stub

51	holder.addView(R.id.default_lable);

52	holder.addView(R.id.default_value);

53

}

54

55

@Override

56	public void setViewValue(ViewHolder holder, int position) {

57	// TODO Auto-generated method stub

58	DefaultItem item = getItem(position);

59	holder.getTextView(R.id.default_lable).setText(item.getLable());

60	holder.getTextView(R.id.default_value).setText(item.getValue());

61

}

62

63

@Override

64	public boolean isEnabled(int position) {

65	// TODO Auto-generated method stub

66	return false;

67

}

68

69

}

javabean代码

01	public class DefaultItem {

02

03	String lable;

04	String value;

05

06	public DefaultItem(String lable, String value) {

07

super();

08	this.lable = lable;

09	this.value = value;

10

}

11

12	public String getLable() {

13	return lable;

14

}

15

16	public void setLable(String lable) {

17	this.lable = lable;

18

}

19

20	public String getValue() {

21	return value;

22

}

23

24	public void setValue(String value) {

25	this.value = value;

26

}

27

28

}

xml代码

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

02	<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

03	android:layout_width="match_parent"

04	android:layout_height="match_parent"

05	android:orientation="horizontal"

06	android:padding="@dimen/margin_10" >

07

08

<TextView

09	android:id="@+id/default_lable"

10	android:layout_width="wrap_content"

11	android:layout_height="wrap_content" />

12

13

<TextView

14	android:layout_width="wrap_content"

15	android:layout_height="wrap_content"

16	android:text=":" />

17

18

<TextView

19	android:id="@+id/default_value"

20	android:layout_width="wrap_content"

21	android:layout_height="wrap_content" />

22

23	</LinearLayout>

每次实现的代码仅仅这么点

01

@Override

02	public void initView(ViewHolder holder) {

03	// TODO Auto-generated method stub

04	holder.addView(R.id.default_lable);

05	holder.addView(R.id.default_value);

06

}

07

08

@Override

09	public void setViewValue(ViewHolder holder, int position) {

10	// TODO Auto-generated method stub

11	DefaultItem item = getItem(position);

12	holder.getTextView(R.id.default_lable).setText(item.getLable());

13	holder.getTextView(R.id.default_value).setText(item.getValue());

14

}

是不是非常不错呢？

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• leehom 2015年03月06日 于 IT十万为什么 发表