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编写自己的Adapter模板

时间：2015-03-07 02:14:22 阅读：340 评论：0 收藏：0 [点我收藏+]

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

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import java.util.ArrayList;

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import java.util.Collection;

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import java.util.Collections;

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import java.util.Comparator;

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import java.util.List;

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?

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import android.content.Context;

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import android.content.res.Resources;

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import android.view.LayoutInflater;

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import android.view.View;

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import android.view.ViewGroup;

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?

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?

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/**

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?* 实现这个适配器模板会少很多代码

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?* @author leehom

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?* @param <T>

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?*/

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

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?

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????protected List<T> list;

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????protected Context context;

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????protected LayoutInflater inflater;

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????private int layoutID;

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?

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

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????????super();

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????????this.context = context;

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

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????????this.layoutID = layoutID;

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????????Collections.addAll(list, ts);

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

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????}

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?

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

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????????super();

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????????this.layoutID = layoutID;

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????????this.context = context;

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

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????????this.list.addAll(list);

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

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????}

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?

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????public Resources getResources() {

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????????return context.getResources();

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????}

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?

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????public synchronized void add(T object) {

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????????list.add(object);

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????}

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?

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

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????????list.addAll(collection);

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????}

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?

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????public synchronized void remove(T object) {

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????????list.remove(object);

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????}

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?

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

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????????list.add(index, object);

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????}

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?

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????public synchronized void clear() {

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????????list.clear();

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????}

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?

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

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????????Collections.sort(list, comparator);

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????}

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?

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????@Override

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????public T getItem(int position) {

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????????// TODO Auto-generated method stub

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????????return list.get(position);

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????}

077
?

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????@Override

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????public int getCount() {

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????????// TODO Auto-generated method stub

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????????return list.size();

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????}

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?

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????@Override

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????public long getItemId(int position) {

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????????// TODO Auto-generated method stub

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????????return position;

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????}

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?

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????@Override

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

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????????// TODO Auto-generated method stub

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????????ViewHolder holder = null;

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????????if (convertView == null) {

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

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????????????holder = new ViewHolder(convertView);

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????????????initView(holder);

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????????????convertView.setTag(holder);

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????????} else {

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

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????????}

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????????setViewValue(holder, position);

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????????return convertView;

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????}

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?

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????public List<T> getList() {

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????????return list;

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????}

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?????

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????/**

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?????* 向ViewHolder类里面添加View

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?????* @param holder

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?????*/

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????public abstract void initView(ViewHolder holder);

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?

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????/**

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?????* 从ViewHolder获取对应ID的View设置其值

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?????* @param holder

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?????* @param t 数据对象

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?????*/

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

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?

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}

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;

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import java.lang.reflect.InvocationTargetException;

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import java.lang.reflect.Method;

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import java.util.ArrayList;

05
?

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import android.annotation.SuppressLint;

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import android.content.Context;

08
?

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import com.fenjin.app.humiture.R;

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import com.fenjin.app.item.DefaultItem;

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?

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@SuppressLint("DefaultLocale")

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public class DefaultAdapter extends BaseAdapter<DefaultItem> {

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?

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????public DefaultAdapter(Context context, Object object) {

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

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????????????????R.layout.default_list_item_layout);

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????????// TODO Auto-generated constructor stub

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????????try {

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

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????????????for (Field field : fields) {

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????????????????String lable = field.getName();

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

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

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????????????????buffer.append(firstWord);

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

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????????????????String name = buffer.toString();

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

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

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

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????????????????add(item);

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????????????}

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????????} catch (IllegalArgumentException e) {

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????????????// TODO Auto-generated catch block

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????????????e.printStackTrace();

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????????} catch (NoSuchMethodException e) {

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????????????// TODO Auto-generated catch block

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????????????e.printStackTrace();

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????????} catch (IllegalAccessException e) {

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????????????// TODO Auto-generated catch block

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????????????e.printStackTrace();

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????????} catch (InvocationTargetException e) {

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????????????// TODO Auto-generated catch block

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????????????e.printStackTrace();

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????????}

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????}

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?

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????@Override

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????public void initView(ViewHolder holder) {

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????????// TODO Auto-generated method stub

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

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

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????}

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?

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????@Override

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

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????????// TODO Auto-generated method stub

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????????DefaultItem item = getItem(position);

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

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

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????}

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?

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????@Override

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????public boolean isEnabled(int position) {

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????????// TODO Auto-generated method stub

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????????return false;

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????}

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?

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}

javabean代码

01

public class DefaultItem {

02
?

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????String lable;

04

????String value;

05
?

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????public DefaultItem(String lable, String value) {

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????????super();

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????????this.lable = lable;

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????????this.value = value;

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????}

11
?

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????public String getLable() {

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????????return lable;

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????}

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?

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????public void setLable(String lable) {

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????????this.lable = lable;

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????}

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?

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????public String getValue() {

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????????return value;

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????}

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?

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????public void setValue(String value) {

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????????this.value = value;

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????}

27
?

28
}

xml代码

01

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

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

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????android:layout_width="match_parent"

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????android:layout_height="match_parent"

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????android:orientation="horizontal"

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

07
?

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????<TextView

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

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????????android:layout_width="wrap_content"

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????????android:layout_height="wrap_content" />

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?

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????<TextView

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????????android:layout_width="wrap_content"

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????????android:layout_height="wrap_content"

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????????android:text=":" />

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?

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????<TextView

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

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????????android:layout_width="wrap_content"

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????????android:layout_height="wrap_content" />

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?

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</LinearLayout>

每次实现的代码仅仅这么点

01
@Override

02

public void initView(ViewHolder holder) {

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????// TODO Auto-generated method stub

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

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

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}

07
?

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@Override

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public void setViewValue(ViewHolder holder, int position) {

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????// TODO Auto-generated method stub

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????DefaultItem item = getItem(position);

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

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

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}

是不是非常不错呢？

本文固定链接:?http://www.ithtw.com/1300.html
leehom?2015年03月06日?于?IT十万为什么?发表

编写自己的Adapter模板

原文：http://lexsain.iteye.com/blog/2189739

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