通用BaseAdapter

最新推荐文章于 2025-05-12 13:32:08 发布

watayouxiang

最新推荐文章于 2025-05-12 13:32:08 发布

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分类专栏： android

本文链接：https://blog.youkuaiyun.com/csndwata/article/details/50450052

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本文详细介绍了一种用于Android的通用列表适配器(CommonAdapter)及其ViewHolder模式的实现方式。该适配器能够简化列表视图的创建过程，并提供高度复用性和扩展性。文章通过具体示例展示了如何使用CommonAdapter来展示列表数据，并处理点击事件。

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工具类：

package com.demo.baseadapter.utils;

import java.util.List;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

public abstract class CommonAdapter<T> extends BaseAdapter {
	protected Context mContext;
	protected List<T> mDatas;
	protected LayoutInflater mInflater;
	protected int mlayoutId;

	public CommonAdapter(Context context, List<T> datas, int layoutId) {
		this.mContext = context;
		this.mDatas = datas;
		this.mlayoutId = layoutId;
		mInflater = LayoutInflater.from(context);
	}

	@Override
	public int getCount() {
		return mDatas.size();
	}

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

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

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		ViewHolder holder = ViewHolder.get(mContext, convertView, parent,
				mlayoutId, position);
		convert(holder, getItem(position));
		return holder.getConvertView();
	}

	public abstract void convert(ViewHolder holder, T t);
}

package com.demo.baseadapter.utils;

import android.content.Context;
import android.graphics.Bitmap;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

public class ViewHolder {
	private SparseArray<View> mViews;// 比map效率高
	private int mPosition;
	private View mConvertView;

	public View getConvertView() {
		return mConvertView;
	}

	public ViewHolder(Context context, ViewGroup parent, int layoutId,
			int position) {
		this.mViews = new SparseArray<View>();
		this.mPosition = position;
		this.mConvertView = LayoutInflater.from(context).inflate(layoutId,
				parent, false);
		this.mConvertView.setTag(this);
	}

	public static ViewHolder get(Context context, View convertView,
			ViewGroup parent, int layoutId, int position) {
		if (null == convertView) {
			return new ViewHolder(context, parent, layoutId, position);
		} else {
			ViewHolder holder = (ViewHolder) convertView.getTag();
			holder.mPosition = position;
			return holder;
		}
	}

	public <T extends View> T getView(int viewId) {
		View view = mViews.get(viewId);
		if (null == view) {
			view = mConvertView.findViewById(viewId);
			mViews.put(viewId, view);
		}
		return (T) view;
	}

	/**
	 * 设置TextView的值
	 * 
	 * @param viewId
	 * @param text
	 * @return
	 */
	public ViewHolder setText(int viewId, String text) {
		TextView tv = getView(viewId);
		tv.setText(text);
		return this;
	}

	public ViewHolder setImageResource(int viewId, int resId) {
		ImageView view = getView(viewId);
		view.setImageResource(resId);
		return this;
	}

	public ViewHolder setImageBitmap(int viewId, Bitmap bitmap) {
		ImageView view = getView(viewId);
		view.setImageBitmap(bitmap);
		return this;
	}

}

使用：

package com.demo.baseadapter;

import java.util.List;

import com.demo.baseadapter.utils.CommonAdapter;
import com.imooc.baseadapter.utils.ViewHolder;

import android.content.Context;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.CheckBox;

public class MyAdapterWithCommAdapter extends CommonAdapter<Bean> {
	public MyAdapterWithCommAdapter(Context context, List<Bean> datas,
			int layoutId) {
		super(context, datas, layoutId);
	}

	@Override
	public void convert(ViewHolder holder, final Bean bean) {
		holder.setText(R.id.tv_title, bean.getTitle())
				.setText(R.id.tv_desc, bean.getDesc())
				.setText(R.id.tv_time, bean.getTime())
				.setText(R.id.tv_phone, bean.getPhone());

		final CheckBox cBox = (CheckBox) (holder.getView(R.id.cb));
		if (cBox != null) {
			cBox.setChecked(bean.isChecked());
			cBox.setOnClickListener(new OnClickListener() {
				@Override
				public void onClick(View v) {
					bean.setChecked(cBox.isChecked());
				}
			});
		}
	}
}