Create a universal adapter! ! !

Recent projects often listView and GridView, can be said to be a component of the project is almost Listview GridView will use, Android also provides a mechanism to bind the data to these controls, it is Adapter
recently smoked a time, and he has created a universal adapter

Before we look at some of the wording:

public class ImageViewAdapter2 extends RecyclerView.Adapter<ImageViewAdapter2.MyViewHolder> {
    private SweatQuestryModel deviceDataBean;
    private Context context;
    private ArrayList<String> urls = null;
    public ImageViewAdapter2(Context context, SweatQuestryModel deviceDataBean) {
        this.context = context;
        this.deviceDataBean = deviceDataBean;
        initImageUrl(deviceDataBean);
    }

    private void initImageUrl(SweatQuestryModel deviceDataBean) {
        urls = new ArrayList<>();
        if(urls != null){
            urls.addAll(deviceDataBean.getList());
        }
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.item_imageview, null);
        MyViewHolder holder = new MyViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, final int position) {
        GlideUtil.loadNetImg2(context, holder.image, urls.get(position) , R.drawable.default_square_image);
        holder.image.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Bundle bundle = new Bundle();
                bundle.putStringArrayList("imgUrls",urls);
                bundle.putInt("position", position);
                bundle.putInt("type", PictureActivity.TYPE_NET_IMG);
                ActivityUtils.showActivity(context, PictureActivity.class, bundle);
            }
        });

    }

    @Override
    public int getItemCount() {
        return deviceDataBean == null ? 0 : 9;
    }

    class MyViewHolder extends RecyclerView.ViewHolder {
        ImageView image;

        public MyViewHolder(View itemView) {
            super(itemView);
            image = (ImageView) itemView.findViewById(R.id.sweat_recycler_image);
        }
    }
}

Although this is not bad with them, but always need to inherit a BaseAdapter, then realize there's a bunch of ways, but every time we are most concerned about is nothing more than getView method, the rest of the method are almost the same code. This is not to be optimized together? In the second, when we use the Adapter, in order to optimize performance, often creates a Holder. The Holder is stored inside each View, operations Holer's nothing more than initialization, data binding, reuse. This is not the extract can be extracted?
If we can encapsulate:

/**
 * 类功能描述：</br>
 *v Viewholder
 * @author yuyahao
 * @version 1.0 </p> 修改时间：</br> 修改备注：</br>
 */
public class VolTeamAdapter extends CommonAdapter<Bean> {

    private Context context;
    public VolTeamAdapter(Context context, List<Bean> listDatas,   int layoutId) {
        super(context, listDatas, layoutId);
    }

    @Override
    protected void fillData(ViewHolder holder, int position) {
        TextView actNum = holder.getView(R.id.team_item_active_num);
        TextView time = holder.getView(R.id.team_item_time);
        TextView title = holder.getView(R.id.team_item_title);
        ImageView icon = holder.getView(R.id.team_item_icon);
        Bean item = listDatas.get(position);
        actNum.setText(String.valueOf(item.getActiveSum()) + "个");
        time.setText(String.valueOf(item.getTimeSun()) + "h");
        title.setText(item.getName());

        GlideUtil.loadNetImgC(context,icon, item.getPhoto(), R.drawable.bg_app_title);
    }
}

This is not simple. Each write this adapter can be used.

The first step: construction BaseAdapter

**
 * 类功能描述：</br>
 *v 使用
 * @author yuyahao
 * @version 1.0 </p> 修改时间：</br> 修改备注：</br>
 */
public class VolTeamAdapter extends CommonAdapter<Bean> {

    private Context context;
    public VolTeamAdapter(Context context, List<Bean> listDatas,   int layoutId) {
        super(context, listDatas, layoutId);
        this.context = context;
    }

    @Override
    protected void fillData(ViewHolder holder, int position) {
        TextView actNum = holder.getView(R.id.team_item_active_num);
        TextView time = holder.getView(R.id.team_item_time);
        TextView title = holder.getView(R.id.team_item_title);
        ImageView icon = holder.getView(R.id.team_item_icon);
        Bean item = listDatas.get(position);
        actNum.setText(String.valueOf(item.getActiveSum()) + "个");
        time.setText(String.valueOf(item.getTimeSun()) + "h");
        title.setText(item.getName());

        GlideUtil.loadNetImgC(context,icon, item.getPhoto(), R.drawable.bg_app_title);
    }
}

Well, not guessing, all directly on the code.

/**
 * 类功能描述：</br>
 *v Viewholder
 * @author yuyahao
 * @version 1.0 </p> 修改时间：</br> 修改备注：</br>
 */
public abstract class CommonAdapter<T> extends BaseAdapter {
    /*** 上下文的Context*/
    protected Context mContext;

    /*** list的数据*/
    protected List<T> listDatas;

    /** Item布局ID*/
    protected int layoutId;

    public CommonAdapter(Context context, List<T> listDatas, int layoutId) {
        this.mContext = context;
        this.listDatas = listDatas;
        this.layoutId = layoutId;
    }

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

/**
 * 获取当前点击的Item的数据时用
 * 在onItemClick中 parent.getAdapter().getItem(),获取当前点击的Item的数据
 */
    @Override
    public Object getItem(int position) {
        return listDatas.get(position);
    }

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

    /**
     *加载每一个Item，该方法是最关键的
     */
@   Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = ViewHolder.getViewHolder(mContext, convertView,  parent, layoutId, position);
        fillData(holder, position);
        return holder.getMConvertView();
    }

    /**
     *
     * 抽象方法，用于子类实现，填充数据
     * @param holder
     * @param position
     */
    protected abstract void fillData(ViewHolder holder, int position);
}

The second step of universal Holer

/**
 * 类功能描述：</br>
 *v Viewholder
 * @author yuyahao
 * @version 1.0 </p> 修改时间：</br> 修改备注：</br>
 */
public class ViewHolder {
    private  int mPosition;
    /**
     * View容器，用于存放Holer中的View
     * 据网上说是 SparseArray是这样的
     * SparseArray 是Android推荐使用的一个优化容器，相当于一个Map<integer,View>
     */
    private SparseArray<View> mViews;

    /**
     * Item布局View convertView
     */
    private View mConvertView;
    public ViewHolder(Context context, ViewGroup parent, int layoutId) {
        mViews = new SparseArray<View>();
        mConvertView = LayoutInflater.from(context).inflate(layoutId, null);
        mConvertView.setTag(this);
    }

    /**
     * 获取ViewHolder
     * @param context
     *  上下文
     * @param convertView
     * @param parent
     * @param layoutId
     *            布局layout Id
     * @param
     * @return
     */

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

    public ViewHolder(Context context, ViewGroup parent, int layoutId, int position) {
        this.mViews = new SparseArray<View>();
        this.mPosition = position;
        this.mConvertView = LayoutInflater.from(context).inflate(layoutId,
                parent, false);
        this.mConvertView.setTag(this);
    }
    /**
     * 拿到一个ViewHolder对象
     * @param context
     * @param convertView
     * @param parent
     * @param layoutId
     * @param position
     * @return
     */
    public static ViewHolder getViewHolder(Context context, View convertView, ViewGroup parent, int layoutId, int position) {
        if (null == convertView) {
            return new ViewHolder(context, parent, layoutId, position);
        } else {
            ViewHolder holder = (ViewHolder) convertView.getTag();
            holder.mPosition = position;
            return holder;
        }
    }
    /**
     * 获取Holder中的ItemView
     * @param viewId
     * @return
     */
    @SuppressWarnings("unchecked")
    public <T extends View> T getView(int viewId) {
        View item = mViews.get(viewId);
        if (item == null) {
            item = mConvertView.findViewById(viewId);
            mViews.put(viewId, item);
        }
        return (T) item;
    }

    /** * 获取convertView***/
    public View getMConvertView() {
        return mConvertView;
    }

}

Such has been finished.

The third step is to use

/**
 * 类功能描述：</br>
 *v 使用
 * @author yuyahao
 * @version 1.0 </p> 修改时间：</br> 修改备注：</br>
 */
public class VolTeamAdapter extends CommonAdapter<Bean> {

    private Context context;
    public VolTeamAdapter(Context context, List<Bean> listDatas,   int layoutId) {
        super(context, listDatas, layoutId);
        this.context = context;
    }

    @Override
    protected void fillData(ViewHolder holder, int position) {
        TextView actNum = holder.getView(R.id.team_item_active_num);
        TextView time = holder.getView(R.id.team_item_time);
        TextView title = holder.getView(R.id.team_item_title);
        ImageView icon = holder.getView(R.id.team_item_icon);
        Bean item = listDatas.get(position);
        actNum.setText(String.valueOf(item.getActiveSum()) + "");
        time.setText(String.valueOf(item.getTimeSun()) + "");
        title.setText(item.getName());

        GlideUtil.loadNetImgC(context,icon, item.getPhoto(), R.drawable.bg_app_title);
    }
}

mainActivity:

public class MyTextActivity extends BaseActivity{
    private Context cnt;
    @Bind(R.id.lv_list)
    ListView  lv_list;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        addViewFillInRoot(R.layout.ctivity_mytext);
        ButterKnife.bind(this);
        cnt = this;
        initView();
    }

    private void initView() {
        try {
            List<Bean>  list = DataTest.getMyTestList();
            VolTeamAdapter volTeamAdapter = new VolTeamAdapter(cnt,list,R.layout.my_listr);
            lv_list.setAdapter(volTeamAdapter);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:gravity="center_vertical"
    android:layout_height="match_parent">
    <ImageView
        android:layout_width="@dimen/dp80"
        android:layout_height="@dimen/dp80"
        android:background="@drawable/default_head"
        android:scaleType="fitXY"
        android:id="@+id/team_item_icon"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_marginLeft="@dimen/dp10"
        android:orientation="vertical"
        android:layout_height="@dimen/dp80">
        <TextView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/team_item_title"
            android:gravity="center_vertical"
            android:layout_weight="1"
            android:text="卡卡罗特"/>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_weight="1"
            android:layout_height="match_parent"
            android:gravity="center_vertical">
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="天不排名"
                android:id="@+id/team_item_time"/>
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="@dimen/dp20"
                android:text="战斗值： "

                android:id="@+id/team_item_active_num"/>

        </LinearLayout>
    </LinearLayout>
</LinearLayout>

Renderings: