Android 完美对BaseAdapter进行二次封装

    在开发列表的界面的时候经常会重写BaseAdapter,利用网上的知识点技巧，自己对它进行了二次封装方便以后在项目中再次使用。使用起来方便得很。

当然如何你看了代码可以的话，也可以对ExpandableListAdapter同样的封装！

使用自定义BaseAdapter：

package com.cyy.myandroid;

import android.content.Context;
import android.provider.ContactsContract.Data;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.style.ForegroundColorSpan;
import android.view.View;
import android.widget.TextView;

public class RankingListAdapter extends BaseAdapter<Data> {

	public RankingListAdapter(Context context) {
		super(context);
	}

	@Override
	public int getContentView() {//item布局
		return R.layout.activity_main_item;
	}

	@Override
	public void onInitView(View view, int position) {
		TextView tvNumb = get(view, R.id.tv);  // 直接item布局里的控件

		Data data = getItem(position);
		tvNumb.setText(String.valueOf(position + 1));
	}
}

自定义BaseAdapter：

package com.cyy.myandroid;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public abstract class BaseAdapter<T> extends android.widget.BaseAdapter {
	private List<T> list;

	protected Context context;

	public BaseAdapter(Context context) {
		init(context, new ArrayList<T>());
	}

	public BaseAdapter(Context context, List<T> list) {
		init(context, list);
	}

	private void init(Context context, List<T> list) {
		this.list = list;
		this.context = context;
	}

	public List<T> getList() {
		return list;
	}

	public void setList(List<T> list) {
		this.list = list;
	}

	public void clear() {
		this.list.clear();
		notifyDataSetChanged();
	}

	public void addAll(List<T> list) {
		if (list != null) {
			this.list.addAll(list);
			notifyDataSetChanged();
		}
	}

	@Override
	public int getCount() {
		return list == null ? 0 : list.size();
	}

	@Override
	public T getItem(int position) {
		return list.get(position);
	}

	@Override
	public long getItemId(int position) {
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		if (null == convertView) {
			convertView = inflate(getContentView());
		}
		onInitView(convertView, position);
		return convertView;
	}

	/** 加载布局 */
	private View inflate(int layoutResID) {
		LayoutInflater layoutInflater = (LayoutInflater) context
				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		View view = layoutInflater.inflate(layoutResID, null);
		return view;
	}

	public abstract int getContentView();

	public abstract void onInitView(View view, int position);

	/**
	 * 
	 * @param view
	 *            converView
	 * @param id
	 *            控件的id
	 * @return 返回<T extends View>
	 */
	@SuppressWarnings("unchecked")
	protected <E extends View> E get(View view, int id) {
		SparseArray<View> viewHolder = (SparseArray<View>) view.getTag();
		if (null == viewHolder) {
			viewHolder = new SparseArray<View>();
			view.setTag(viewHolder);
		}
		View childView = viewHolder.get(id);
		if (null == childView) {
			childView = view.findViewById(id);
			viewHolder.put(id, childView);

		}
		return (E) childView;
	}
}