ListView的万能适配器和ListView的多布局

本文介绍了一种适用于ListView的通用适配器实现方案,包括单一布局和多布局的适配器,通过抽象类和接口定义了适配器的基本结构,并提供了具体的实现案例。

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ListView的万能适配器

CommomLvAdapter:

public abstract class CommomLvAdapter<T> extends BaseAdapter {

    private Context mContext;
    private List<T> mDataList;
    private int mLayoutId;

    public CommomLvAdapter(Context context, List<T> dataList, int layoutId) {
        mContext = context;
        mDataList = dataList;
        mLayoutId = layoutId;
    }

    public void refreshData(List<T> dataList) {
        this.mDataList = dataList;
        notifyDataSetChanged();
    }

    public void deleteList(int position) {
        this.mDataList.remove(position);
        this.notifyDataSetChanged();
    }


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

    @Override
    public T getItem(int position) {
        return mDataList.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        LvViewHolder holder = LvViewHolder.getHolder(mContext, convertView, parent, mLayoutId, position);
        T t = mDataList.get(position);
        convert(holder, t, position);
        return holder.getConvertView();
    }

    public abstract void convert(LvViewHolder holder, T itemData, int position);
}


LvViewHolder :

public class LvViewHolder {

    private final View mConvertView;

    //Android开发中官方推荐:当使用HashMap(K, V),如果K为整数类型时,使用SparseArray的效率更高
    private SparseArray<View> mViews;

    private Context mContext;

    protected int mPosition;

    protected int mLayoutId;

    public LvViewHolder(Context context, View itemView, ViewGroup parent, int position) {
        this.mContext = context;
        this.mPosition = position;
        mConvertView = itemView;
        mViews = new SparseArray<>();
        mConvertView.setTag(this);
    }


    public static LvViewHolder getHolder(Context context, View convertView, ViewGroup parent, int layoutId, int position) {
        if (convertView == null) {
            View itemView = LayoutInflater.from(context).inflate(layoutId, parent, false);
            LvViewHolder holder = new LvViewHolder(context, itemView, parent, position);
            holder.mLayoutId = layoutId;
            return holder;
        } else {
            LvViewHolder holder = (LvViewHolder) convertView.getTag();
            holder.mPosition = position;
            return holder;
        }
    }

    public View getConvertView() {
        return mConvertView;
    }

    public int getPosition() {
        return mPosition;
    }

    public int getLayoutId() {
        return mLayoutId;
    }

    public void updatePosition(int position) {
        mPosition = position;
    }


    public <T extends View> T getView(int viewId) {
        View view = mViews.get(viewId);
        if (view == null) {
            view = mConvertView.findViewById(viewId);
            mViews.append(viewId, view);
        }
        return (T) view;
    }

    public LvViewHolder setText(int viewId, String text) {
        TextView view = getView(viewId);
        view.setText(text);
        return this;
    }

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

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

    public LvViewHolder setImageByUrl(int viewId, String imageUrl) {
        ImageView view = getView(viewId);
       /* Glide.with(mContext).load(url)
                .diskCacheStrategy(DiskCacheStrategy.ALL)
                .error(R.mipmap.ic_launcher)
                .placeholder(R.mipmap.ic_launcher)
                .into(view);*/
        Glide.with(mContext).load(imageUrl).into(view);
        return this;
    }

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

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

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

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

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

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

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

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

    public LvViewHolder setOnLongClickListener(int viewId, View.OnLongClickListener listener) {
        View view = getView(viewId);
        view.setOnLongClickListener(listener);
        return this;
    }

}

ListView的多布局

public class MutilLayoutAdapter extends BaseAdapter {

    public static final int TYPE1 = 0;// 3种不同的布局
    public static final int TYPE2 = 1;
    public static final int TYPE3 = 2;


    private Context mContext;

    private List<UserInfo> mDataList;

    private final LayoutInflater mLayoutInflater;

    public MutilLayoutAdapter(Context context, List<UserInfo> dataList) {
        mContext = context;
        mDataList = dataList;
        mLayoutInflater = LayoutInflater.from(context);
    }

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

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        int type = mDataList.get(position).getType();
        BaseViewHolder baseViewHolder = null;
        if (convertView == null) {
            switch (type) {
                case TYPE1:
                    convertView = mLayoutInflater.inflate(R.layout.item_list1, parent, false);
                    baseViewHolder = new ViewHolder1(convertView);
                    break;
                case TYPE2:
                    convertView = mLayoutInflater.inflate(R.layout.item_list2, parent, false);
                    baseViewHolder = new ViewHolder2(convertView);
                    break;
                case TYPE3:
                    convertView = mLayoutInflater.inflate(R.layout.item_list3, parent, false);
                    baseViewHolder = new ViewHolder3(convertView);
                    break;
            }
            convertView.setTag(baseViewHolder); //关联convertView和ViewHolder
        } else {
            baseViewHolder = (BaseViewHolder) convertView.getTag();
        }

        //填充数据
        UserInfo userInfo = mDataList.get(position);
        fillData(type, baseViewHolder, userInfo);
        return convertView;
    }

    private void fillData(int type, BaseViewHolder baseViewHolder, UserInfo userInfo) {
        switch (type) {
            case TYPE1:
                fillDataType1(baseViewHolder, userInfo);
                break;
            case TYPE2:
                fillDataType2(baseViewHolder, userInfo);
                break;
            case TYPE3:
                fillDataType3(baseViewHolder, userInfo);
                break;
        }
    }

    private void fillDataType1(BaseViewHolder baseViewHolder, UserInfo userInfo) {
        ViewHolder1 holder = (ViewHolder1) baseViewHolder;
        holder.tvName.setText(userInfo.getName());
    }

    private void fillDataType2(BaseViewHolder baseViewHolder, UserInfo userInfo) {
        ViewHolder2 holder = (ViewHolder2) baseViewHolder;
        holder.tvName.setText(userInfo.getName());
        holder.tvDesc.setText(userInfo.getDesc());
    }

    private void fillDataType3(BaseViewHolder baseViewHolder, UserInfo userInfo) {
        ViewHolder3 holder = (ViewHolder3) baseViewHolder;
        holder.tvName.setText(userInfo.getName());
        holder.tvDesc.setText(userInfo.getDesc());
        holder.tvTime.setText(userInfo.getTime());
    }


    /**
     * 返回某個位置item布局类型
     *
     * @param position
     * @return
     */
    @Override
    public int getItemViewType(int position) {
        return mDataList.get(position).getType();
    }

    /**
     * 返回item布局类型的个数
     *
     * @return
     */
    @Override
    public int getViewTypeCount() {
        return 3;
    }

    static class BaseViewHolder {

    }

    static class ViewHolder1 extends BaseViewHolder {

        private TextView tvName;

        public ViewHolder1(View convertView) {
            tvName = convertView.findViewById(R.id.tv_name);
        }
    }

    static class ViewHolder2 extends BaseViewHolder {
        private TextView tvName;
        private TextView tvDesc;

        public ViewHolder2(View convertView) {
            tvName = convertView.findViewById(R.id.tv_name);
            tvDesc = convertView.findViewById(R.id.tv_desc);
        }
    }


    static class ViewHolder3 extends BaseViewHolder {
        private TextView tvName;
        private TextView tvDesc;
        private TextView tvTime;

        public ViewHolder3(View convertView) {
            tvName = convertView.findViewById(R.id.tv_name);
            tvDesc = convertView.findViewById(R.id.tv_desc);
            tvTime = convertView.findViewById(R.id.tv_time);
        }
    }
}

public class MainActivity extends AppCompatActivity {

    private ListView mListView;

    private List<UserInfo> mDataList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mListView = (ListView) findViewById(R.id.listview);

        Random r = new Random();
        for (int i = 1; i <= 50; i++) {
            int type = r.nextInt(3); //随机设置类型
            UserInfo userInfo = new UserInfo();
            userInfo.setName("标题" + i);
            userInfo.setDesc("这是一段描述内容");
            userInfo.setTime("2019-03-14");
            userInfo.setType(type);
            mDataList.add(userInfo);
        }

        MutilLayoutAdapter mutilLayoutAdapter = new MutilLayoutAdapter(this, mDataList);
        mListView.setAdapter(mutilLayoutAdapter);
    }
 }

ListView多布局适配器的封装

public class CommomMultiLvAdapter<T> extends BaseAdapter {

    protected Context mContext;
    protected List<T> mDatas;

    private ItemViewDelegateManager mItemViewDelegateManager;


    public CommomMultiLvAdapter(Context context, List<T> datas) {
        this.mContext = context;
        this.mDatas = datas;
        mItemViewDelegateManager = new ItemViewDelegateManager();
    }

    public CommomMultiLvAdapter addItemViewDelegate(ItemViewDelegate<T> itemViewDelegate) {
        mItemViewDelegateManager.addDelegate(itemViewDelegate);
        return this;
    }

    private boolean useItemViewDelegateManager() {
        return mItemViewDelegateManager.getItemViewDelegateCount() > 0;
    }

    @Override
    public int getViewTypeCount() {
        if (useItemViewDelegateManager()) {
            return mItemViewDelegateManager.getItemViewDelegateCount();
        }
        return super.getViewTypeCount();
    }

    @Override
    public int getItemViewType(int position) {
        if (useItemViewDelegateManager()) {
            int viewType = mItemViewDelegateManager.getItemViewType(mDatas.get(position), position);
            return viewType;
        }
        return super.getItemViewType(position);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ItemViewDelegate itemViewDelegate = mItemViewDelegateManager.getItemViewDelegate(mDatas.get(position), position);
        int layoutId = itemViewDelegate.getItemViewLayoutId();
        LvViewHolder viewHolder = null;
        if (convertView == null) {
            View itemView = LayoutInflater.from(mContext).inflate(layoutId, parent, false);
            viewHolder = new LvViewHolder(mContext, itemView, parent, position);
            viewHolder.mLayoutId = layoutId;
            onViewHolderCreated(viewHolder, viewHolder.getConvertView());
        } else {
            viewHolder = (LvViewHolder) convertView.getTag();
            viewHolder.mPosition = position;
        }

        convert(viewHolder, getItem(position), position);
        return viewHolder.getConvertView();
    }

    protected void convert(LvViewHolder viewHolder, T item, int position) {
        mItemViewDelegateManager.convert(viewHolder, item, position);
    }

    public void onViewHolderCreated(LvViewHolder holder, View itemView) {
    }

    @Override
    public int getCount() {
        return mDatas.size();
    }

    @Override
    public T getItem(int position) {
        return mDatas.get(position);
    }

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

public interface ItemViewDelegate<T> {

    int getItemViewLayoutId();

    boolean isForViewType(T item, int position);

    void convert(LvViewHolder holder, T t, int position);
}

public class ItemViewDelegateManager<T> {
    SparseArrayCompat<ItemViewDelegate<T>> delegates = new SparseArrayCompat();

    public int getItemViewDelegateCount() {
        return delegates.size();
    }

    public ItemViewDelegateManager<T> addDelegate(ItemViewDelegate<T> delegate) {
        int viewType = delegates.size();
        if (delegate != null) {
            delegates.put(viewType, delegate);
            viewType++;
        }
        return this;
    }

    public ItemViewDelegateManager<T> addDelegate(int viewType, ItemViewDelegate<T> delegate) {
        if (delegates.get(viewType) != null) {
            throw new IllegalArgumentException(
                    "An ItemViewDelegate is already registered for the viewType = "
                            + viewType
                            + ". Already registered ItemViewDelegate is "
                            + delegates.get(viewType));
        }
        delegates.put(viewType, delegate);
        return this;
    }

    public ItemViewDelegateManager<T> removeDelegate(ItemViewDelegate<T> delegate) {
        if (delegate == null) {
            throw new NullPointerException("ItemViewDelegate is null");
        }
        int indexToRemove = delegates.indexOfValue(delegate);

        if (indexToRemove >= 0) {
            delegates.removeAt(indexToRemove);
        }
        return this;
    }

    public ItemViewDelegateManager<T> removeDelegate(int itemType) {
        int indexToRemove = delegates.indexOfKey(itemType);

        if (indexToRemove >= 0) {
            delegates.removeAt(indexToRemove);
        }
        return this;
    }

    public int getItemViewType(T item, int position) {
        int delegatesCount = delegates.size();
        for (int i = delegatesCount - 1; i >= 0; i--) {
            ItemViewDelegate<T> delegate = delegates.valueAt(i);
            if (delegate.isForViewType(item, position)) {
                return delegates.keyAt(i);
            }
        }
        throw new IllegalArgumentException(
                "No ItemViewDelegate added that matches position=" + position + " in data source");
    }

    public void convert(LvViewHolder holder, T item, int position) {
        int delegatesCount = delegates.size();
        for (int i = 0; i < delegatesCount; i++) {
            ItemViewDelegate<T> delegate = delegates.valueAt(i);

            if (delegate.isForViewType(item, position)) {
                delegate.convert(holder, item, position);
                return;
            }
        }
        throw new IllegalArgumentException(
                "No ItemViewDelegateManager added that matches position=" + position + " in data source");
    }


    public int getItemViewLayoutId(int viewType) {
        return delegates.get(viewType).getItemViewLayoutId();
    }

    public int getItemViewType(ItemViewDelegate itemViewDelegate) {
        return delegates.indexOfValue(itemViewDelegate);
    }

    public ItemViewDelegate getItemViewDelegate(T item, int position) {
        int delegatesCount = delegates.size();
        for (int i = delegatesCount - 1; i >= 0; i--) {
            ItemViewDelegate<T> delegate = delegates.valueAt(i);
            if (delegate.isForViewType(item, position)) {
                return delegate;
            }
        }
        throw new IllegalArgumentException(
                "No ItemViewDelegate added that matches position=" + position + " in data source");
    }

    public int getItemViewLayoutId(T item, int position) {
        return getItemViewDelegate(item, position).getItemViewLayoutId();
    }
}

使用

public class MainActivity extends AppCompatActivity {

    private ListView mListView;

    private List<UserInfo> mDataList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mListView = (ListView) findViewById(R.id.listview);

        Random r = new Random();
        for (int i = 1; i <= 50; i++) {
            int type = r.nextInt(3); //随机设置类型
            UserInfo userInfo = new UserInfo();
            userInfo.setName("标题" + i);
            userInfo.setDesc("这是一段描述内容");
            userInfo.setTime("2019-03-14");
            userInfo.setType(type);
            mDataList.add(userInfo);
        }

        MultiAdapter multiAdapter=new MultiAdapter(this,mDataList);
        mListView.setAdapter(multiAdapter);


    }

    class MultiAdapter extends CommomMultiLvAdapter<UserInfo> {

        public MultiAdapter(Context context, List<UserInfo> datas) {
            super(context, datas);
            addItemViewDelegate(new Type1ItemDelagate());
            addItemViewDelegate(new Type2ItemDelagate());
            addItemViewDelegate(new Type3ItemDelagate());
        }
    }

    class Type1ItemDelagate implements ItemViewDelegate<UserInfo> {

        @Override
        public int getItemViewLayoutId() {
            return R.layout.item_list1;
        }

        @Override
        public boolean isForViewType(UserInfo item, int position) {
            return false;
        }

        @Override
        public void convert(LvViewHolder holder, UserInfo userInfo, int position) {
            holder.setText(R.id.tv_name, userInfo.getName());
        }
    }

    class Type2ItemDelagate implements ItemViewDelegate<UserInfo> {

        @Override
        public int getItemViewLayoutId() {
            return R.layout.item_list2;
        }

        @Override
        public boolean isForViewType(UserInfo item, int position) {
            return false;
        }

        @Override
        public void convert(LvViewHolder holder, UserInfo userInfo, int position) {
            holder.setText(R.id.tv_name, userInfo.getName());
            holder.setText(R.id.tv_desc, userInfo.getDesc());
        }
    }

    class Type3ItemDelagate implements ItemViewDelegate<UserInfo> {

        @Override
        public int getItemViewLayoutId() {
            return R.layout.item_list3;
        }

        @Override
        public boolean isForViewType(UserInfo item, int position) {
            return false;
        }

        @Override
        public void convert(LvViewHolder holder, UserInfo userInfo, int position) {
            holder.setText(R.id.tv_name, userInfo.getName());
            holder.setText(R.id.tv_desc, userInfo.getDesc());
            holder.setText(R.id.tv_time, userInfo.getTime());
        }
    }
}

参考博客
https://blog.youkuaiyun.com/lmj623565791/article/details/38902805

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