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。