Android之Adapter的封装与抽象（三）

本篇博文是在之前的基础之上进行了封装与抽象的。主要是思想是通过封装一个通用ViewHolder，来解耦和提高通用性。

如果你没看过我之前写的Adapter的封装与抽象，建议先看下，这样对看本片博文思路有帮助。下面有相关博文的链接。

首先是通用的ViewHolder，通过Adapter 每一个Item的convertView来实例化一个ViewHolder，然后根据控件的id得到相对应的控件，ViewHolder里面包括常用的一些控件常用的属性设置。

ViewHolder代码如下：

import android.content.res.ColorStateList;import android.graphics.Bitmap;import android.graphics.Typeface;import android.graphics.drawable.Drawable;import android.os.Build;import android.support.annotation.IdRes;import android.support.annotation.StringRes;import android.support.v7.widget.RecyclerView;import android.text.util.Linkify;import android.util.SparseArray;import android.view.View;import android.view.animation.AlphaAnimation;import android.view.animation.Animation;import android.widget.Checkable;import android.widget.ImageView;import android.widget.ProgressBar;import android.widget.RatingBar;import android.widget.TextView;import java.util.regex.Pattern;/** * 通用的ViewHolder *      继承 RecyeclerView.ViewHolder 主要是为了通用性更强 * * @author Jenly <[e-mail]> * */public class ViewHolder extends RecyclerView.ViewHolder{    private SparseArray<View> views;    private View convertView;    public ViewHolder (View convertView){        super(convertView);        this.convertView = convertView;        views = new SparseArray<>();    }    public View getConvertView(){        return convertView;    }    private <T extends View> T findView(@IdRes int id){        return (T)convertView.findViewById(id);    }    public    <T extends  View> T getView(@IdRes int id){        View v = views.get(id);        if(v == null){            v = findView(id);            views.put(id,v);        }        return (T)v;    }    //---------------------- 控件常用设置    public View setBackgroundResource(@IdRes int id,int resId){        View v = getView(id);        v.setBackgroundResource(resId);        return v;    }    public View setBackground(@IdRes int id,Drawable drawable){        View v = getView(id);        v.setBackground(drawable);        return v;    }    public View setBackgroundColor(@IdRes int id,int color){        View v = getView(id);        v.setBackgroundColor(color);        return v;    }    public View setTag(@IdRes int id,Object tag){        View v = getView(id);        v.setTag(tag);        return v;    }    public View setTag(@IdRes int id,int key,Object tag){        View v = getView(id);        v.setTag(key,tag);        return v;    }    public View setVisibility(@IdRes int id,int visibility){        View v = getView(id);        v.setVisibility(visibility);        return v;    }    public View setVisibility(@IdRes int id,boolean isVisible){        View v = getView(id);        if(isVisible)            v.setVisibility(View.VISIBLE);        v.setVisibility(View.GONE);        return v;    }    public void setAlpha(@IdRes int id,float alpha){        View v = getView(id);        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB){            v.setAlpha(alpha);        }else{            Animation anim = new AlphaAnimation(alpha,alpha);            anim.setFillAfter(true);            v.startAnimation(anim);        }    }    public TextView setCompoundDrawableLeft(@IdRes int id,Drawable drawable){        return setCompoundDrawables(id,drawable,null,null,null);    }    public TextView setCompoundDrawableTop(@IdRes int id,Drawable drawable){        return setCompoundDrawables(id,null,drawable,null,null);    }    public TextView setCompoundDrawableRight(@IdRes int id,Drawable drawable){        return setCompoundDrawables(id,null,null,drawable,null);    }    public TextView setCompoundDrawableBottom(@IdRes int id,Drawable drawable){        return setCompoundDrawables(id,null,null,null,drawable);    }    public TextView setCompoundDrawables(@IdRes int id,Drawable left,Drawable top,Drawable right,Drawable bottom){        TextView tv = getView(id);        tv.setCompoundDrawables(left, top, right, bottom);        return tv;    }    public TextView setCompoundDrawablePadding(@IdRes int id,int padding){        TextView tv = getView(id);        tv.setCompoundDrawablePadding(padding);        return tv;    }    public TextView setCompoundDrawablesWithIntrinsicBounds(@IdRes int id,Drawable left,Drawable top,Drawable right,Drawable bottom){        TextView tv = getView(id);        tv.setCompoundDrawablesWithIntrinsicBounds(left, top, right, bottom);        return tv;    }    public TextView setCompoundDrawablesWithIntrinsicBounds(@IdRes int id,int left,int top,int right,int bottom){        TextView tv = getView(id);        tv.setCompoundDrawablesWithIntrinsicBounds(left, top, right, bottom);        return tv;    }    public TextView setText(@IdRes int id,@StringRes int resId){        TextView tv = getView(id);        tv.setText(resId);        return tv;    }    public TextView setText(@IdRes int id,CharSequence text){        TextView tv = getView(id);        tv.setText(text);        return tv;    }    public TextView setTextColor(@IdRes int id,int color){        TextView tv = getView(id);        tv.setTextColor(color);        return tv;    }    public TextView setTextColor(@IdRes int id,ColorStateList colors){        TextView tv = getView(id);        tv.setTextColor(colors);        return tv;    }    public TextView setTypeface(@IdRes int id,Typeface tf){        TextView tv = getView(id);        tv.setTypeface(tf);        return tv;    }    public TextView setTypeface(@IdRes int id,Typeface tf, int style){        TextView tv = getView(id);        tv.setTypeface(tf,style);        return tv;    }    public TextView addLinks(@IdRes int id){        TextView tv = getView(id);        Linkify.addLinks(tv,Linkify.ALL);        return tv;    }    public TextView addLinks(@IdRes int id,int mask){        TextView tv = getView(id);        Linkify.addLinks(tv,mask);        return tv;    }    public TextView addLinks(@IdRes int id, Pattern pattern, String scheme){        TextView tv = getView(id);        Linkify.addLinks(tv,pattern,scheme);        return tv;    }    public ImageView setImageResource(@IdRes int id,int resId){        ImageView iv = getView(id);        iv.setImageResource(resId);        return iv;    }    public ImageView setImageBitmap(@IdRes int id,Bitmap bitmap){        ImageView iv = getView(id);        iv.setImageBitmap(bitmap);        return iv;    }    public ImageView setImageDrawable(@IdRes int id,Drawable drawable){        ImageView iv = getView(id);        iv.setImageDrawable(drawable);        return iv;    }    public Checkable setChecked(@IdRes int id,boolean isChecked){        Checkable checkable = getView(id);        checkable.setChecked(isChecked);        return checkable;    }    public boolean isChecked(@IdRes int id){        Checkable checkable = getView(id);        return checkable.isChecked();    }    public Checkable toggle(@IdRes int id){        Checkable checkable = getView(id);        checkable.toggle();        return checkable;    }    public ProgressBar setProgress(@IdRes int id,int progress){        ProgressBar progressBar = getView(id);        progressBar.setProgress(progress);        return progressBar;    }    public ProgressBar setMax(@IdRes int id,int max){        ProgressBar progressBar = getView(id);        progressBar.setMax(max);        return progressBar;    }    public RatingBar setRating(@IdRes int id,float rating){        RatingBar  ratingBar = getView(id);        ratingBar.setRating(rating);        return ratingBar;    }    public RatingBar setRating(@IdRes int id,float rating,int max){        RatingBar  ratingBar = getView(id);        ratingBar.setRating(rating);        ratingBar.setMax(max);        return ratingBar;    }    public RatingBar setNumStars(@IdRes int id,int numStars){        RatingBar  ratingBar = getView(id);        ratingBar.setNumStars(numStars);        return ratingBar;    }    //---------------------- 监听事件    public void setOnClickListener(@IdRes int id, View.OnClickListener onClickListener){        getView(id).setOnClickListener(onClickListener);    }    public void setOnTouchListener(@IdRes int id, View.OnTouchListener onTouchListener){        getView(id).setOnTouchListener(onTouchListener);    }    public void setOnLongClickListener(@IdRes int id, View.OnLongClickListener onLongClickListener){        getView(id).setOnLongClickListener(onLongClickListener);    }    public void setOnKeyListener(@IdRes int id, View.OnKeyListener onKeyListener){        getView(id).setOnKeyListener(onKeyListener);    }}

有了通用的ViewHolder，下面就是对之前的HolderAdapter和HolderRecyclerAdapter的扩展了。

ViewHoderAdapter代码如下：

/** * 通用适配器 *      在HolderAdapter基础之上将H:ViewHolder具体化，通过通用的ViewHolder根据控件的id得到对应控件，来进行相关的数据绑定操作 * @author Jenly <[e-mail]> * */public abstract class ViewHolderAdapter<T> extends HolderAdapter<T,ViewHolder> {    public ViewHolderAdapter(Context context, List<T> listData) {        super(context, listData);    }    @Override    public ViewHolder buildHolder(View convertView, T t, int position) {        return new ViewHolder(convertView);    }}

ViewHolderRecyclerAdapter代码如下：

/** * 通用适配器 *      在HolderRecyclerAdapter基础之上将H:ViewHolder具体化，通过通用的ViewHolder根据控件的id得到对应控件，来进行相关的数据绑定操作 * @author Jenly <[e-mail]> * */public abstract class ViewHolderRecyclerAdapter<T> extends HolderRecyclerAdapter<T,ViewHolder> {    public ViewHolderRecyclerAdapter(Context context, List<T> listData) {        super(context, listData);    }    @Override    public ViewHolder buildHolder(View convertView, int viewType) {        return new ViewHolder(convertView);    }}

这样在写Adapter时，只需继承ViewHolderAdapter或ViewHolderRecyclerAdapter，然后只管设置contervtView布局和绑定数据就可以了。妈妈再也不同担心重复的写自定义Adapter了。

示例：

public class TestAdapter extends ViewHolderAdapter<String> {    public TestAdapter(Context context, List<String> listData) {        super(context, listData);    }    @Override    public View buildConvertView(LayoutInflater layoutInflater, String s, int position) {        return inflate(R.layout.list_item);    }    @Override    public void bindViewDatas(ViewHolder holder, String s, int position) {        holder.setText(R.id.tv,s);    }}

就这么简单的几句代码，妈妈再也不用担心我写自定义Adapter了。

所有最新源码已总结上传至github 欢迎Star或Fork。