RecyclerView 的 RecyclerView.Adapter 通用版的实现（有加载更多的功能）
Android5.0给我们带来了RecyclerView 他的灵活性非常强，可以替代Listview和GridView,本文主要说说他的适配器的使用，下面是自己封装的一个通用版的适配器（），废话不多说，看代码：
//这个Adapter里面有两个抽象方法
public abstract class MyRecycleViewAdapter<T> extends RecyclerView.Adapter {
private static final int TYPE_ITEM = 10;
private static final int TYPE_FOOTER = 11;
private List<T> list;//数据集合
private int itemLayout;//item的布局
private Context context;
private boolean isNeedMore;//是否需要加载更多的view
public boolean isNeedMore() {
return isNeedMore;
}
public void setIsNeedMore(boolean isNeedMore) {
this.isNeedMore = isNeedMore;
}
/**
* item的点击和长按监听
*/
public interface OnItemClickListener {
void onItemClick(View view, int position);
void onItemLongClick(View view, int position);
}
private OnItemClickListener onItemClickListener;
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
}
//构造器list:要加载的数据集合，itemlayout:item的布局（R.layout.item）,isNeedMore:是否需要加载更多的功能（false:不需要，true:需要）
public MyRecycleViewAdapter(List<T> list,int itemLayout,Context context,boolean isNeedMore){
this.list = list;
this.itemLayout = itemLayout;
this.context = context;
this.isNeedMore = isNeedMore;
}
public List<T> getList() {
return list;
}
public void setList(List<T> list) {
this.list = list;
}
public int getItemLayout() {
return itemLayout;
}
public void setItemLayout(int itemLayout) {
this.itemLayout = itemLayout;
}
@Override
public int getItemViewType(int position) {
if(!isNeedMore) {
return super.getItemViewType(position);
}
if (position + 1 == getItemCount()) {
return TYPE_FOOTER;
} else {
return TYPE_ITEM;
}
}
//1、第一步，先在onCreateViewHolder里面添加item的布局，添加到RecyclerView里面
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if(viewType == TYPE_FOOTER) {
//返回加载更多的布局的holder
return new FooterViewHolder(
LayoutInflater.from(parent.getContext()).inflate(
R.layout.recycle_foot_view, parent, false));
}else {
//返回item的布局的holder
View view = LayoutInflater.from(context).inflate(itemLayout, parent, false);
return new MyViewHolder(view);
}
}
//3、第三步，把ViewHolder传递到onBindViewHolder,进行item的数据绑定
@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
//((MyViewHolder) holder).item.setText(position + "");
if(TYPE_ITEM == getItemViewType(position)
|| super.getItemViewType(position) == getItemViewType(position)) {
Log.e("TAG", "自定义的adapter的item设置点击事件");
//当然这里也可以使用里面写的自定义接口的方法来实现，本人觉得
//这样在使用的时候会更简洁，不需要设置adapter的监听
holder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
setPositionClick(position);
}
});
//长按监听
holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
return false;
}
});
initData((MyViewHolder) holder, position);
}
// holder.itemView.setOnClickListener(new View.OnClickListener() {
// @Override
// public void onClick(View v) {
// int position = holder.getLayoutPosition();
// onItemClickListener.onItemClick(holder.itemView, position);
// }
// });
// holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
// @Override
// public boolean onLongClick(View v) {
// int position = holder.getLayoutPosition();
// onItemClickListener.onItemLongClick(holder.itemView, position);
// return false;
// }
// });
}
@Override
public int getItemCount() {
if(isNeedMore) {
return list.size()==0?0:list.size()+1;
}else {
return list.size();
}
}
/**
*itemview 的点击事件（抽象方法）
* @param position
*/
protected abstract void setPositionClick(int position);
/**
* 对item进行加载数据
* @param holder recycleview的ViewHolder position位置
* @param position
*/
protected abstract void initData(MyViewHolder holder, int position);
//2、第二步:在ViewHolder里面初始化视图
//如果你的item布局里面有别的视图可以自己添加对应的方法就是了
//目前里面没有写那么多
public class MyViewHolder extends RecyclerView.ViewHolder {
private View findView;
private View convertView;
private SparseArray<Object> tags;
//用来替代Map<Integer,Object>的容器, 效率比map高
private SparseArray<View> views;
public MyViewHolder(View itemView) {
super(itemView);
this.convertView = itemView;
this.findView = itemView;
tags = new SparseArray<>();
views = new SparseArray<View>();
}
public View getConverView() {
return convertView;
}
public View getFindView() {
return findView;
}
// /**
// * 根据视图id得到对应的视图对象
// * @param viewId
// * @return
// */
// public <T extends View> T getView(@IdRes int viewId) {
// View view = views.get(viewId);
// if (view == null) {
// view = convertView.findViewById(viewId);
// views.put(viewId, view);
// }
// return (T) view;
// }
/**
* 根据 viewId 获取一个 View 对象
*/
// public View getView(@IdRes int viewId) {
// View view;
// Object viewObj = findView.getTag(viewId);
// if (null != viewObj) {
// view = (View) viewObj;
// } else {
// view = findView.findViewById(viewId);
// findView.setTag(viewId, view);
// }
// return view;
// }
public <T extends View> T getView(@IdRes int viewId) {
View view;
Object viewObj = findView.getTag(viewId);
if (null != viewObj) {
view = (View) viewObj;
} else {
view = findView.findViewById(viewId);
findView.setTag(viewId, view);
}
return (T) view;
}
/**
* 设置指定的id视图的可见性
* @param viewId
* @param visibility
* @return
*/
public MyViewHolder setViewVisibility(@IdRes int viewId,int visibility){
if(getView(viewId)!=null) {
getView(viewId).setVisibility(visibility);
}
return this;
}
/**
* 根据 viewId 获取一个 ImageView 对象
*/
public ImageView getImageView(@IdRes int viewId) {
return (ImageView) getView(viewId);
}
/**
* 根据 viewId 获取一个 TextView 对象
*/
public TextView getTextView(@IdRes int viewId) {
return (TextView) getView(viewId);
}
/**
* 根据 viewId 获取一个 CheckBox 对象
*/
public CheckBox getCheckBox(@IdRes int viewId) {
return (CheckBox) getView(viewId);
}
/**
* 为指定 viewId 的 ImageView 对象设置图片
*/
public MyViewHolder setImageDrawable(@IdRes int viewId, @Nullable Drawable drawable) {
if (getImageView(viewId)!=null) {
getImageView(viewId).setImageDrawable(drawable);
}
return this;
}
/**
* 为指定 viewId 的 ImageView 对象设置图片
*/
public MyViewHolder setImageResource(@IdRes int viewId, @DrawableRes int resId) {
if (getImageView(viewId)!=null) {
getImageView(viewId).setImageResource(resId);
}
return this;
}
/**
* 为指定 viewId 的 ImageView 对象设置图片
*/
public MyViewHolder setImageBitmap(@IdRes int viewId, Bitmap bitmap) {
if (getImageView(viewId)!=null) {
getImageView(viewId).setImageBitmap(bitmap);
}
return this;
}
/**
* 未指定的viewId 的ImageView 对象设置背景图片
* @param viewId
* @param drawable
* @return
*/
public MyViewHolder setImageBackgroud(@IdRes int viewId, @Nullable Drawable drawable) {
if (getImageView(viewId)!=null) {
getImageView(viewId).setBackground(drawable);
}
return this;
}
/**
* 使用 xUtils 为指定 viewId 的 ImageView 对象设置图片
*/
public MyViewHolder bindImage(@IdRes int viewId, @NonNull String url) {
bindImage(viewId, url, null);
return this;
}
/**
* 使用 xUtils 为指定 viewId 的 ImageView 对象设置图片
*/
public MyViewHolder bindImage(@IdRes int viewId, @NonNull String url, ImageOptions options) {
if (getImageView(viewId)!=null) {
x.image().bind(getImageView(viewId), url, options);
}
return this;
}
/**
* 为指定 viewId 的 TextView 对象设置文字
*/
public MyViewHolder setText(@IdRes int viewId, @StringRes int resid) {
if (getTextView(viewId)!=null) {
getTextView(viewId).setText(resid);
}
return this;
}
/**
* 为指定 viewId 的 TextView 对象设置文字
*/
public MyViewHolder setText(@IdRes int viewId, CharSequence text) {
if (getTextView(viewId)!=null) {
getTextView(viewId).setText(text);
}
return this;
}
public MyViewHolder setTextSize(@IdRes int viewId,@Size int size){
if(getTextView(viewId) != null){
getTextView(viewId).setTextSize(size);
}
return this;
}
/**
* 为指定 viewId 的 TextView 对象设置文字颜色
*/
public MyViewHolder setTextColor(@IdRes int viewId, @ColorInt int color) {
if (getTextView(viewId)!=null) {
getTextView(viewId).setTextColor(color);
}
return this;
}
/**
* 为指定 viewId 的 View 对象设置 TAG
*/
public MyViewHolder setTag(@IdRes int viewId, final Object tag) {
if (getView(viewId)!=null) {
getView(viewId).setTag(tag);
}
return this;
}
/**
* 为指定 viewId 的 View 对象设置背景图片
*/
public MyViewHolder setBackgroundResource(@IdRes int viewId, @DrawableRes int resid) {
if (getView(viewId)!=null) {
getView(viewId).setBackgroundResource(resid);
}
return this;
}
/**
* 使用当前 ViewHolder 记录一个 TAG
*/
public MyViewHolder putTag(int key, final Object tag) {
tags.put(key, tag);
return this;
}
/**
* 从当前 ViewHolder 中取出一个TAG
*/
public Object getTag(int key) {
return tags.get(key);
}
/**
* 为指定 viewId 的 CheckBox 对象设置选中状态
*/
public MyViewHolder setChecked(@IdRes int viewId, boolean checked) {
if (getCheckBox(viewId)!=null) {
getCheckBox(viewId).setChecked(checked);
}
return this;
}
/**
* 切换指定 viewId 的 CheckBox 的选中状态
*/
public MyViewHolder toggle(@IdRes int viewId) {
if (getCheckBox(viewId)!=null) {
getCheckBox(viewId).toggle();
}
return this;
}
/**
* 为指定 viewId 的 View 对象设置点击监听
*/
public MyViewHolder setOnClickListener(@IdRes int viewId, @Nullable View.OnClickListener listener) {
if (getView(viewId)!=null) {
getView(viewId).setOnClickListener(listener);
}
return this;
}
/**
* 为指定 viewId 的 View 对象设置是否可见
*/
public MyViewHolder setVisibile(@IdRes int viewId, boolean visible) {
if (getView(viewId)!=null) {
getView(viewId).setVisibility(visible ? View.VISIBLE : View.GONE);
}
return this;
}
/**
* 为指定 viewId 的 View 对象设置是否可见
*/
public MyViewHolder setVisibility(@IdRes int viewId, int visibility) {
if (getView(viewId)!=null) {
getView(viewId).setVisibility(visibility);
}
return this;
}
/**
* 为指定 viewId 的 View 对象设置布局参数
*/
public MyViewHolder setLayoutParams(@IdRes int viewId, RelativeLayout.LayoutParams params) {
if (getView(viewId)!=null) {
getView(viewId).setLayoutParams(params);
}
return this;
}
}
public class FooterViewHolder extends RecyclerView.ViewHolder {
public FooterViewHolder(View itemView) {
super(itemView);
}
}
}在来说说具体的使用吧：
private void setRecyclerView(final List data,int layout) {
//线性布局管理器
//false:不进行反转
//true:进行反转
final LinearLayoutManager manager = new LinearLayoutManager(ListActivity.this, LinearLayoutManager.VERTICAL, false);
recycle.setLayoutManager(manager);
recycle.setAdapter(new MyRecycleViewAdapter(data, layout, ListActivity.this, true) {
@Override
protected void setPositionClick(int position) {
Intent intent = new Intent(ListActivity.this,DetailedInfoActivity.class);
intent.putExtra("positions",positions);
startActivity(intent);
}
@Override
protected void initData(MyViewHolder holder, int position) {
DetailsInfo info = (DetailsInfo) data.get(position);
setHolderData(data,info,holder,position);
}
});
//滚动监听，在滚动监听里面去实现加载更多的功能
recycle.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
int lastVisibleItemPosition = manager.findLastVisibleItemPosition();
if (lastVisibleItemPosition + 1 == recycle.getAdapter().getItemCount()) {
if (!isLoading) {//一个布尔的变量，默认是false
isLoading = true;
Log.e("TAG", "page==" + page);
handler.postDelayed(new Runnable() {
@Override
public void run() {
getDataFromeNet();
}
}, 2000);
} else if (page == 3) {
//当没有更多的数据的时候去掉加载更多的布局
MyRecycleViewAdapter adapter = (MyRecycleViewAdapter) recycle.getAdapter();
adapter.setIsNeedMore(false);
adapter.notifyDataSetChanged();
}
}
}
});
}
private int page=0;
/**
* 上拉加载更多
*/
private void getDataFromeNet() {
for (int i = 0; i < 6; i++) {
DetailsInfo detailsInfo = new DetailsInfo("宝马4S店"+i+i,"小李","2016.2.3","合格");
data.add(detailsInfo);
}
page++;
if(page!=3) {
isLoading = false;
}else {
isLoading = true;
}
recycle.getAdapter().notifyDataSetChanged();
}好了一个简单的通用版有加载更多的adapter就实现啦，当你的项目中有好几个的列表的时候，不妨试试这个，能够减少你很多的工作量。
时间： 2024-08-26 10:30:53