Android-打造万能适配器

使用方式

public class TestAdapter extends CommonBaseAdapter<String> {    public TestAdapter(Context context, List<String> list) {        super(context, list);    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        ViewHolder holder = ViewHolder.get(context, convertView, parent, R.layout.search_history_list_item);        // 方法一        holder.setTextForTextView(R.id.tv_content, list.get(position));        // 方法二        TextView textView = holder.getView(R.id.tv_content);        textView.setText(list.get(position));        return holder.getConvertView();    }}

• CommonAdapter复用多数重复的代码

package com.core.common.adapter;import java.util.List;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;/** * base adapter *  * @author river *  * @param <T> */public abstract class CommonAdapter<T> extends BaseAdapter {    protected LayoutInflater mInflater;    protected List<T> mList;    protected Context context;    public CommonAdapter(Context context, List<T> list) {        this.mInflater = LayoutInflater.from(context);        this.mList = list;        this.context = context;    }    @Override    public int getCount() {        return mList.size();    }    @Override    public T getItem(int position) {        return mList.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public abstract View getView(int position, View convertView, ViewGroup parent);}

• 万能的ViewHolder

package com.core.common.adapter;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;/** * 通用的ViewHolder *  * @author river * */public class ViewHolder {    private SparseArray<View> mViews;    private View mConvertView;    private ViewHolder(Context context, ViewGroup parent, int layoutId) {        this.mViews = new SparseArray<View>();        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) {        ViewHolder viewHolder = null;        if (convertView == null) {            viewHolder = new ViewHolder(context, parent, layoutId);        } else {            viewHolder = (ViewHolder) convertView.getTag();        }        return viewHolder;    }    /**     * 通过id获取组件     * 注意不要将组件声明到全局，否则永远获取的是最后一个组件     * @param viewId     * @return     */    @SuppressWarnings("unchecked")    public <T extends View> T getView(int viewId) {        View view = mViews.get(viewId);        if (view == null) {            view = mConvertView.findViewById(viewId);            mViews.put(viewId, view);        }        return (T) view;    }    public View getConvertView() {        return this.mConvertView;    }    public ViewHolder setTextForTextView(int viewId, String text) {        TextView tv = getView(viewId);        tv.setText(text);        return this;    }    public ViewHolder setImageForImageView(int viewId, int resId) {        ImageView image = getView(viewId);        image.setImageResource(resId);        return this;    }    public ViewHolder setImageForImageView(int viewId, Bitmap bitmap) {        ImageView image = getView(viewId);        image.setImageBitmap(bitmap);        return this;    }}