Android CommonAdapter----ListView,GridView万能适配器

本人最近接手一个项目，兴致勃勃的看了源码，一脸懵逼，这里就不吐槽了。列表是用的listview（没有用recyclerView），代码里面的适配器写法没有封装，很多重复的代码，看到头大，自己也懒得写。所以动手封装了一下，虽然这个功能的封装很常见了，以前也做过同样的事，但是没有记录，所以这次想着记下来。

adapter写法：

/**
 * 万能通适配器---ListView,GridView
 */
public abstract class CommonAdapter extends BaseAdapter {

    protected Context mContext;
    protected int mLayoutId;
    protected List data;

    public CommonAdapter(Context mContext, int mLayoutId, List data) {
        this.mContext = mContext;
        this.mLayoutId = mLayoutId;
        this.data = data;
    }

    @Override
    public int getCount() {
        if (data != null) {
            return data.size();
        }
        return 0;
    }

    @Override
    public Object getItem(int position) {
        return data.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        BaseViewHolder viewHolder = BaseViewHolder.getViewHolder(mContext, convertView, parent, mLayoutId, position);
        convertView(viewHolder, (D) getItem(position));
        return viewHolder.getConvertView();
    }

    public abstract void convertView(BaseViewHolder holder, D item);
}

---

viewHolder写法：

public class BaseViewHolder {

    private View mConvertView;

    private int mPosition;

    private SparseArray mSparseArray;

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

    public static BaseViewHolder getViewHolder(Context context, View convertView, ViewGroup parent, int layoutId, int position) {
        if (convertView == null) {
            return new BaseViewHolder(context, parent, layoutId, position);
        }
        return (BaseViewHolder) convertView.getTag();
    }

    public View getConvertView() {
        return mConvertView;
    }

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

    /**
     * TextView文本
     *
     * @param viewId
     * @param text
     * @return
     */
    public BaseViewHolder setText(int viewId, String text) {
        TextView view = getView(viewId);
        view.setText(text);
        return this;
    }

    /**
     * ImageView 设置资源
     *
     * @param imageViewId
     * @param drawable
     * @return
     */
    public BaseViewHolder setImageResourse(int imageViewId, int drawable) {
        ImageView imageView = getView(imageViewId);
        imageView.setImageResource(drawable);
        return this;
    }

    public int getItemPosition() {
        return mPosition;
    }
}

可以在ViewHoler里封装其他属性设置，比如：字体颜色，背景等。