打造通用的Adapter

前言

ListView、RecycleView、GridView是我们开发时最常用的控件，通过打造一款通用的Adapter可以方便开发。这里的RecycleView是分开的

ListView、GridView的Adapter的打造

直接上代码：SimpleBaseAdapter

public abstract class SimpleBaseAdapter<T> extends BaseAdapter {

    public Context mContext;
    protected List<T> mList;
    private LayoutInflater mInflater;

    public SimpleBaseAdapter(Context context) {
        init(context);
    }

    public SimpleBaseAdapter(Context context, List<T> list) {
        mList = list;
        init(context);
    }

    private void init(Context context) {
        mContext = context;
        mInflater = LayoutInflater.from(context);
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        MyHolder holder=null;
        if (convertView==null){
            convertView=LayoutInflater.from(mContext).inflate(getLayoutID(),parent,false);
            holder=new MyHolder(mContext,convertView);
            convertView.setTag(getLayoutID(),holder);
        }else {
            holder= (QuickHolder) convertView.getTag(getLayoutID());
        }
        convert(holder,mList.get(position));
        holder.convertView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mOnItemClickListener!=null){
                    mOnItemClickListener.onItemClick(v,position,mList.get(position));
                }
            }
        });
        return convertView;
    }

    protected abstract int getLayoutID();
    protected abstract void convert(MyHolder holder, T t);

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

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

    public void addList(List<T> nList) {
        if (null == mList) {
            mList = new ArrayList<T>();
        }
        mList.addAll(nList);
        notifyDataSetChanged();
    }

    protected LayoutInflater getInflater() {
        return mInflater;
    }

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

    @Override
    public Object getItem(int position) {
        return mList == null ? null : mList.get(position);
    }

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

    public OnItemClickListener<T> mOnItemClickListener;
    public interface OnItemClickListener<T> {
        void onItemClick(View view, int position, T model);

        void onItemLongClick(View view, int position, T model);
    }

    public void setOnItemClickListener(OnItemClickListener<T> listener) {
        this.mOnItemClickListener = listener;
    }

    public class MyHolder MyHolder extends BaseHolder{
        protected QuickHolder(Context context, View view) {
            super(context,view);
        }
    }
}

这里继承BaseAdapter,通过对getView()方法的将convertView与Holder进行关联，并提供点击。同时提供BaseHolder代码：

public class BaseHolder {

    private final SparseArray<View> views;
    private final Context context;
    public View convertView;

    protected BaseHolder(Context context, View view) {
        this.context = context;
        this.views = new SparseArray<View>();
        convertView = view;

    }

    public BaseHolder setText(int viewId, CharSequence value) {
        TextView view = getView(viewId);
        view.setText(value);
        return this;
    }

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

    public BaseHolder setBackgroundColor(int viewId, int color) {
        View view = getView(viewId);
        view.setBackgroundColor(color);
        return this;
    }

    public BaseHolder setBackgroundRes(int viewId, int backgroundRes) {
        View view = getView(viewId);
        view.setBackgroundResource(backgroundRes);
        return this;
    }

    public BaseHolder setTextColor(int viewId, int textColor) {
        TextView view = getView(viewId);
        view.setTextColor(textColor);
        return this;
    }

    public BaseHolder setTextColorRes(int viewId, int textColorRes) {
        TextView view = getView(viewId);
        view.setTextColor(context.getResources().getColor(textColorRes));
        return this;
    }

    public BaseHolder setImageDrawable(int viewId, Drawable drawable) {
        ImageView view = getView(viewId);
        view.setImageDrawable(drawable);
        return this;
    }

    public BaseHolder setImageUrl(int viewId, String imageUrl) {
        ImageView view = getView(viewId);
        Glide.with(context).load(imageUrl).crossFade().into(view);
        return this;
    }

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

    public BaseHolder setAlpha(int viewId, float value) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            getView(viewId).setAlpha(value);
        } else {
            AlphaAnimation alpha = new AlphaAnimation(value, value);
            alpha.setDuration(0);
            alpha.setFillAfter(true);
            getView(viewId).startAnimation(alpha);
        }
        return this;
    }

    public BaseHolder setVisible(int viewId, boolean visible) {
        View view = getView(viewId);
        view.setVisibility(visible ? View.VISIBLE : View.GONE);
        return this;
    }

    public BaseHolder setProgress(int viewId, int progress) {
        ProgressBar view = getView(viewId);
        view.setProgress(progress);
        return this;
    }

    public BaseHolder setOnClickListener(int viewId, View.OnClickListener listener) {
        View view = getView(viewId);
        view.setOnClickListener(listener);
        return this;
    }

    public BaseHolder setOnTouchListener(int viewId, View.OnTouchListener listener) {
        View view = getView(viewId);
        view.setOnTouchListener(listener);
        return this;
    }

    public BaseHolder setOnLongClickListener(int viewId, View.OnLongClickListener listener) {
        View view = getView(viewId);
        view.setOnLongClickListener(listener);
        return this;
    }
    public BaseHolder setOnItemClickListener(int viewId, AdapterView.OnItemClickListener listener) {
        AdapterView view = getView(viewId);
        view.setOnItemClickListener(listener);
        return this;
    }

    public BaseHolder setOnItemLongClickListener(int viewId, AdapterView.OnItemLongClickListener listener) {
        AdapterView view = getView(viewId);
        view.setOnItemLongClickListener(listener);
        return this;
    }

    public BaseHolder setOnItemSelectedClickListener(int viewId, AdapterView.OnItemSelectedListener listener) {
        AdapterView view = getView(viewId);
        view.setOnItemSelectedListener(listener);
        return this;
    }

    public BaseHolder setOnCheckedChangeListener(int viewId, CompoundButton.OnCheckedChangeListener listener) {
        CompoundButton view = getView(viewId);
        view.setOnCheckedChangeListener(listener);
        return this;
    }

    public BaseHolder setTag(int viewId, Object tag) {
        View view = getView(viewId);
        view.setTag(tag);
        return this;
    }

    public BaseHolder setTag(int viewId, int key, Object tag) {
        View view = getView(viewId);
        view.setTag(key, tag);
        return this;
    }

    public BaseHolder setChecked(int viewId, boolean checked) {
        View view = getView(viewId);
        if (view instanceof CompoundButton) {
            ((CompoundButton) view).setChecked(checked);
        } else if (view instanceof CheckedTextView) {
            ((CheckedTextView) view).setChecked(checked);
        }
        return this;
    }

    public BaseHolder setAdapter(int viewId, Adapter adapter) {
        AdapterView view = getView(viewId);
        view.setAdapter(adapter);
        return this;
    }

    @SuppressWarnings("unchecked")
    public  <T extends View> T getView(int viewId) {
        View view = views.get(viewId);
        if (view == null) {
            view = convertView.findViewById(viewId);
            views.put(viewId, view);
        }
        return (T) view;
    }
}

BaseHolder提供了一系列的方法供我们显示数据，在继承BaseAdapter后需要实现 int getLayoutID(); convert(MyHolder holder, T t);这两个方法，这时候就可以直接使用（例如：holder.setText(R.id.text1,t.getName())）

RecycleView Adapter的打造

public abstract class BaseRecyclerAdapter<T> extends
        RecyclerView.Adapter<BaseRecyclerViewHolder> {
    protected Context mContext;
    protected LayoutInflater mInflater;
    protected List<T> mDatas = new ArrayList<>();
    public OnItemClickListener<T> mOnItemClickListener;

    public BaseRecyclerAdapter(Context context, List<T> datas) {
        mContext = context;
        mInflater = LayoutInflater.from(context);
        if (datas != null && datas.size()>0) {
            mDatas = datas;
        }
    }

    protected abstract int getLayoutId();

    @Override
    public int getItemViewType(int position) {
        return super.getItemViewType(position);
    }

    @Override
    public int getItemCount() {
        int count = 0;
        if (mDatas.size() > 0) {
            count = mDatas.size();
        }
        return count;
    }


    public void remove(int position) {
        mDatas.remove(position);
    }

    public void removeAll() {
        mDatas.clear();
    }

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

    public List<T> getDatas() {
        return mDatas;
    }

    // 点击事件接口
    public interface OnItemClickListener<T> {
        void onItemClick(View view, int position, T model);

        void onItemLongClick(View view, int position, T model);
    }

    public void setOnItemClickListener(OnItemClickListener<T> listener) {
        this.mOnItemClickListener = listener;
    }


    @Override
    public void onBindViewHolder(BaseRecyclerViewHolder holder, final int position) {
        convert(holder,mDatas.get(position));
        holder.convertView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mOnItemClickListener!=null){
                    mOnItemClickListener.onItemClick(v,position,mDatas.get(position));
                }
            }
        });
    }

    protected abstract void convert(BaseRecyclerViewHolder holder, T t);

    @Override
    public BaseRecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(getLayoutId(), parent, false);
        return new QuickHolder(parent.getContext(),view);
    }


    public class QuickHolder extends BaseRecyclerViewHolder{
        protected QuickHolder(Context context, View view) {
            super(context, view);
        }
    }

BaseRecycleViewHolder与前面的BaseHolder一样，只是需要继承RecyclerView.ViewHolder