一窗声、概述
相信Android開發(fā)，特別是電商項(xiàng)目開發(fā)辜纲，使用RecyclerView笨觅、ListView、GridView是正常不過(guò)的了耕腾。一個(gè)項(xiàng)目下來(lái)屋摇，基本就是一直在寫Adapter。剛開始寫Adapter覺得沒(méi)什么幽邓，無(wú)非就是ListView的繼承BaseAdapter復(fù)寫幾個(gè)方法，getView里面使用ViewHolder模式火脉；RecyclerView的就繼承 RecyclerView.Adapter牵舵，復(fù)寫onCreateViewHolder、onBindViewHolder然后實(shí)現(xiàn)便完事倦挂。但當(dāng)我寫到10遍畸颅、100遍甚至更多的時(shí)候，我就不想寫了方援，反正都是這種寫法没炒，也沒(méi)什么新的套路。于是我就想寫一個(gè)RecyclerView犯戏、ListView送火、GridView通用的Adapter。
二先匪、常見ListView种吸、RecyclerView Adapter寫法的例子
代碼沒(méi)什么難度可以隨便看看就好。
public class ListViewAdapter extends BaseAdapter
{
private LayoutInflater mInflater;
private Context mContext;
private List<String> mDatas;
private int mLayoutId;
public ListViewAdapter(Context context, List<String> mDatas,int layoutId)
{
mInflater = LayoutInflater.from(context);
this.mContext = context;
this.mDatas = mDatas;
this.mLayoutId = layoutId;
}
@Override
public int getCount()
{
return mDatas.size();
}
@Override
public Object getItem(int position)
{
return mDatas.get(position);
}
@Override
public long getItemId(int position)
{
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
ViewHolder viewHolder = null;
if (convertView == null)
{
convertView = mInflater.inflate(R.mLayoutId, parent, false);
viewHolder = new ViewHolder();
viewHolder.mTextView = (TextView) convertView
.findViewById(R.id.id_tv);
convertView.setTag(viewHolder);
} else
{
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.mTextView.setText(mDatas.get(position));
return convertView;
}
private final class ViewHolder
{
TextView mTextView;
}
}
private class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.Holder> {
private LayoutInflater mInflater;
private Context mContext;
private List<String> mData;
private int mLayoutId;
public RecyclerAdapter(Context context, List<String> data, int layoutId) {
mInflater = LayoutInflater.from(context);
this.mContext = context;
this.mData = data;
this.mLayoutId = layoutId;
}
@Override
public Holder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = mInflater.inflate(mLayoutId, parent, false);
return new Holder(view);
}
@Override
public void onBindViewHolder(Holder holder, int position) {
holder.tv.setText(mData.get(position));
}
@Override
public int getItemCount() {
return mData.size();
}
class Holder extends RecyclerView.ViewHolder {
public TextView tv;
public Holder(View itemView) {
super(itemView);
tv = itemView.findViewById(R.id.tv);
}
}
}
三呀非、ListView坚俗、RecyclerView Adapter一些共性分析
1. 要顯示的條目個(gè)數(shù)
2. 要顯示和條目對(duì)應(yīng)的類型
3. ListView、RecyclerView中岸裙，總共有多少個(gè)條目類型
4. 根據(jù)不同的條目類型加載不同的View
5. ListView復(fù)用條目convertView猖败，RecyclerView自帶ViewHoler復(fù)用
四、抽取RecyclerView降允、ListView恩闻、GridView適配器的基類
由于要通用RecyclerView、ListView拟糕、GridView只能將RecyclerView.Adapter和ListAdapter判呕，SpinnerAdapter
這些都給實(shí)現(xiàn)了倦踢。里面也沒(méi)多少個(gè)方法，其實(shí)也是很簡(jiǎn)單侠草。至于一些方法的實(shí)現(xiàn)我考貝BaseAdapter的實(shí)現(xiàn)辱挥，
大家可以去看看BaseAdapter的源碼。
public class BaseAdapter extends RecyclerView.Adapter implements ListAdapter, SpinnerAdapter {
private final DataSetObservable mDataSetObservable = new DataSetObservable();
// RecyclerView========================================================================
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return null;
}
// RecyclerView
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
}
// RecyclerView
@Override
public int getItemCount() {
return 0;
}
// RecyclerView========================================================================
// ListView========================================================================
@Override
public boolean areAllItemsEnabled() {
return true;
}
@Override
public boolean isEnabled(int position) {
return true;
}
@Override
public void registerDataSetObserver(DataSetObserver observer) {
mDataSetObservable.registerObserver(observer);
}
@Override
public void unregisterDataSetObserver(DataSetObserver observer) {
mDataSetObservable.unregisterObserver(observer);
}
public void notifyListDataSetChanged() {
mDataSetObservable.notifyChanged();
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
return null;
}
@Override
public int getViewTypeCount() {
return 1;
}
@Override
public int getItemViewType(int position) {
return 0;
}
@Override
public int getCount() {
return 0;
}
@Override
public boolean isEmpty() {
return getCount() == 0;
}
@Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
return getView(position, convertView, parent);
}
}
五边涕、抽取支持ListView晤碘、 GridView、 RecyclerView多條目的共性
public interface QuickMultiSupport<T> {
/**
* 獲取多條目View類型的數(shù)量
*/
int getViewTypeCount();
/**
* 根據(jù)數(shù)據(jù)功蜓，獲取多條目布局ID
*/
int getLayoutId(T data);
/**
* 根據(jù)數(shù)據(jù)园爷，獲取多條目的ItemViewType
*/
int getItemViewType(T data);
/**
* 是否合并條目-->>使用RecyclerView時(shí)，如果無(wú)效式撼，請(qǐng)用原生的RecyclerView
*/
boolean isSpan(T data);
六童社、打造RecyclerView、ListView著隆、GridView通用的適配器
由于要同時(shí)適配RecyclerView扰楼、ListView、GridView美浦，也就等于把兩個(gè)Adapter的實(shí)現(xiàn)放在一個(gè)類里面
所以代碼有點(diǎn)多弦赖，但代碼我已分開，很容易看浦辨。
還有數(shù)據(jù)都復(fù)制出來(lái)的蹬竖，條目的增刪改查都在Adapter里面。
/**
* RecyclerView流酬、ListView币厕、GridView通用的適配器
*/
public abstract class QuickAdapter<T> extends BaseAdapter {
private Context mContext;
private List<T> mData;
private int mLayoutId;
private QuickMultiSupport<T> mSupport;
private boolean isRecycler;
private int mPosition;
public QuickAdapter(Context context, List<T> data, int layoutId) {
this.mContext = context;
this.mData = data == null ? new ArrayList<T>() : new ArrayList<T>(data);
this.mLayoutId = layoutId;
}
public QuickAdapter(Context context, List<T> data, QuickMultiSupport<T> support) {
this(context, data, 0);
this.mSupport = support;
}
@Override
public int getCount() {
return mData.size();
}
@Override
public T getItem(int position) {
return mData.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
QuickViewHolder holder;
if (convertView == null) {
int layoutId = mLayoutId;
// 多條目的
if (mSupport != null) {
layoutId = mSupport.getLayoutId(mData.get(position));
}
// 創(chuàng)建ViewHolder
holder = createListHolder(parent, layoutId);
} else {
holder = (QuickViewHolder) convertView.getTag();
// 防止失誤，還要判斷
if (mSupport != null) {
int layoutId = mSupport.getLayoutId(mData.get(position));
// 如果布局ID不一樣芽腾，又重新創(chuàng)建
if (layoutId != holder.getLayoutId()) {
// 創(chuàng)建ViewHolder
holder = createListHolder(parent, layoutId);
}
}
}
// 綁定View的數(shù)據(jù)
convert(holder, mData.get(position), position);
return holder.itemView;
}
/**
* 創(chuàng)建ListView的Holer
*/
@NonNull
private QuickViewHolder createListHolder(ViewGroup parent, int layoutId) {
QuickViewHolder holder;
View itemView = LayoutInflater.from(mContext).inflate(layoutId, parent, false);
holder = new QuickViewHolder(itemView, layoutId);
itemView.setTag(holder);
return holder;
}
/**
* ViewType的數(shù)量
*/
@Override
public int getViewTypeCount() {
// 多條目的
if (mSupport != null) {
return mSupport.getViewTypeCount() + super.getViewTypeCount();
}
return super.getViewTypeCount();
}
/**
* 這個(gè)方法是共用的
*/
@Override
public int getItemViewType(int position) {
mPosition = position;
// 多條目的
if (mSupport != null) {
return mSupport.getItemViewType(mData.get(position));
}
return super.getItemViewType(position);
}
// RecyclerView=================================================================================
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
isRecycler = true;
// 如果是多條目劈榨，viewType就是布局ID
View view;
if (mSupport != null) {
int layoutId = mSupport.getLayoutId(mData.get(mPosition));
view = LayoutInflater.from(mContext).inflate(layoutId, parent, false);
} else {
view = LayoutInflater.from(mContext).inflate(mLayoutId, parent, false);
}
QuickViewHolder holder = new QuickViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (holder instanceof QuickViewHolder) {
convert((QuickViewHolder) holder, mData.get(position), position);
}
}
@Override
public int getItemCount() {
return mData.size();
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
if (mSupport == null || recyclerView == null) {
return;
}
RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
final GridLayoutManager gridLayoutManager = (GridLayoutManager) layoutManager;
final GridLayoutManager.SpanSizeLookup spanSizeLookup = gridLayoutManager.getSpanSizeLookup();
// 如果設(shè)置合并單元格就占用SpanCount那個(gè)多個(gè)位置
gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
@Override
public int getSpanSize(int position) {
if (mSupport.isSpan(mData.get(position))) {
return gridLayoutManager.getSpanCount();
} else if (spanSizeLookup != null) {
return spanSizeLookup.getSpanSize(position);
}
return 1;
}
});
gridLayoutManager.setSpanCount(gridLayoutManager.getSpanCount());
}
}
@Override
public void onViewAttachedToWindow(RecyclerView.ViewHolder holder) {
if (mSupport == null) {
return;
}
int position = holder.getLayoutPosition();
// 如果設(shè)置合并單元格
if (mSupport.isSpan(mData.get(position))) {
ViewGroup.LayoutParams lp = holder.itemView.getLayoutParams();
if (lp != null && lp instanceof StaggeredGridLayoutManager.LayoutParams) {
StaggeredGridLayoutManager.LayoutParams p = (StaggeredGridLayoutManager.LayoutParams) lp;
p.setFullSpan(true);
}
}
}
// RecyclerView=================================================================================
/**
* 綁定View的數(shù)據(jù)
*/
protected abstract void convert(QuickViewHolder holder, T item, int position);
//==========================================數(shù)據(jù)相關(guān)================================================
public void add(T elem) {
mData.add(elem);
notifyData();
}
public void addAll(List<T> data) {
mData.addAll(data);
notifyData();
}
public void addFirst(T elem) {
mData.add(0, elem);
notifyData();
}
public void set(T oldElem, T newElem) {
set(mData.indexOf(oldElem), newElem);
notifyData();
}
public void set(int index, T elem) {
mData.set(index, elem);
notify();
}
public void remove(T elem) {
mData.remove(elem);
notifyData();
}
public void remove(int index) {
mData.remove(index);
notifyData();
}
public void replaceAll(List<T> elem) {
mData.clear();
mData.addAll(elem);
notifyData();
}
/**
* 清除
*/
public void clear() {
mData.clear();
notifyData();
}
private void notifyData() {
if (isRecycler) {
notifyDataSetChanged();
} else {
notifyListDataSetChanged();
}
}
public List<T> getData() {
return mData;
}
}
七、通用ViewHolder的抽取
ViewHolder最主要就是實(shí)現(xiàn)平時(shí)常用的方法晦嵌，比如：點(diǎn)擊事件同辣、長(zhǎng)按事件、給TextView設(shè)置內(nèi)容等等
如果不夠惭载，實(shí)際開發(fā)可以自己添加旱函。
public class QuickViewHolder extends RecyclerView.ViewHolder {
private SparseArray<WeakReference<View>> mViews;
private int mLayoutId;
public QuickViewHolder(View itemView) {
this(itemView, -1);
}
public QuickViewHolder(View itemView, int layoutId) {
super(itemView);
mViews = new SparseArray<>();
this.mLayoutId = layoutId;
}
public int getLayoutId() {
return mLayoutId;
}
/**
* 設(shè)置條目的點(diǎn)擊事件
*/
public QuickViewHolder setOnClickListener(View.OnClickListener listener) {
itemView.setOnClickListener(listener);
return this;
}
/**
* 設(shè)置條目的長(zhǎng)按事件
*/
public QuickViewHolder setOnLongClickListener(View.OnLongClickListener listener) {
itemView.setOnLongClickListener(listener);
return this;
}
/**
* 設(shè)置View的點(diǎn)擊事件
*
* @return
*/
public QuickViewHolder setOnClickListener(int viewId, View.OnClickListener listener) {
View view = getView(viewId);
if (view != null) {
view.setOnClickListener(listener);
}
return this;
}
/**
* 獲取條目的View
*/
public View getView() {
return itemView;
}
/**
* 根據(jù)ID獲取條目里面的View
*/
public <T extends View> T getView(int viewId) {
WeakReference<View> viewWeakReference = mViews.get(viewId);
View view = null;
if (viewWeakReference == null) {
view = itemView.findViewById(viewId);
if (view != null) {
mViews.put(viewId, new WeakReference<>(view));
}
} else {
view = viewWeakReference.get();
}
return (T) view;
}
public QuickViewHolder setText(int viewId, CharSequence text) {
TextView tv = getView(viewId);
if (tv != null && !TextUtils.isEmpty(text)) {
tv.setText(text);
}
return this;
}
/**
* 設(shè)置圖片背景顏色
*/
public QuickViewHolder setTextColor(int viewId, int color) {
TextView view = getView(viewId);
if (view != null) {
view.setTextColor(color);
}
return this;
}
/**
* 設(shè)置控件是否可見
*/
public QuickViewHolder setVisible(int viewId, int visible) {
View view = getView(viewId);
view.setVisibility(visible);
return this;
}
/**
* 設(shè)置控件選中
*/
public QuickViewHolder setChecked(int viewId, boolean checked) {
Checkable view = getView(viewId);
view.setChecked(checked);
return this;
}
/**
* 設(shè)置控件背景
*/
public QuickViewHolder setBackgroundRes(int viewId, int backgroundRes) {
View view = getView(viewId);
view.setBackgroundResource(backgroundRes);
return this;
}
/**
* 設(shè)置圖片
*/
public QuickViewHolder setImageResource(int viewId, int imageResId) {
ImageView imageView = getView(viewId);
imageView.setImageResource(imageResId);
return this;
}
/**
* 設(shè)置圖片
*/
public QuickViewHolder setImageBitmap(int viewId, Bitmap bitmap) {
ImageView imageView = getView(viewId);
imageView.setImageBitmap(bitmap);
return this;
}
}
八、項(xiàng)目實(shí)際使用
我只寫了多條目的測(cè)試使用描滔，對(duì)于一種類型的寫法更為簡(jiǎn)單棒妨，我就不寫了。
public class MainActivity extends AppCompatActivity {
private List<IViewType> mData = new ArrayList<>();
private QuickMultiSupport<IViewType> mQuickSupport;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initData();
initViews();
}
/**
* 多條目的ViewType
*/
public interface IViewType {
int getItemViewType();
}
private void initData() {
for (int i = 0; i < 199; i++) {
if (i % 10 == 0) {
MultiBean bean = new MultiBean();
bean.name = "mData--------" + i;
mData.add(bean);
} else {
MultiBean1 bean = new MultiBean1();
bean.name = "mData--------" + i;
mData.add(bean);
}
}
// 多條目支持
mQuickSupport = new QuickMultiSupport<IViewType>() {
// 條目總共兩種類型
@Override
public int getViewTypeCount() {
return 2;
}
// 根據(jù)不用的JavaBean返回不同的布局
@Override
public int getLayoutId(IViewType data) {
if (data instanceof MultiBean) {
return R.layout.item_list1;
}
return R.layout.item_list;
}
@Override
public int getItemViewType(IViewType data) {
return data.getItemViewType();
}
@Override
public boolean isSpan(IViewType data) {
// 是否占用一個(gè)條目，針對(duì)RecyclerView
if (data instanceof MultiBean) {
return true;
}
return false;
}
};
}
private void initViews() {
ListView listView = findViewById(R.id.list_view);
RecyclerView recyclerView = findViewById(R.id.recycler_view);
// ListView設(shè)置Adapter
listView.setAdapter(new CommAdapter(this, mData, mQuickSupport));
// RecyclerView設(shè)置Adapter
recyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL));
recyclerView.setAdapter(new CommAdapter(this, mData, mQuickSupport));
}
class CommAdapter extends QuickAdapter<IViewType> {
public CommAdapter(Context context, List<IViewType> data, int layoutId) {
super(context, data, layoutId);
}
public CommAdapter(Context context, List<IViewType> data, QuickMultiSupport<IViewType> support) {
super(context, data, support);
}
@Override
protected void convert(QuickViewHolder holder, IViewType item, final int position) {
holder.setText(R.id.tv, item.toString());
holder.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// 點(diǎn)擊移除當(dāng)前條目
remove(position);
}
});
}
}
}
至此無(wú)論是RecyclerView還是ListView終于只用一個(gè)Adapter券腔，是不是很開心
項(xiàng)目運(yùn)行的實(shí)際效果：左邊是ListView伏穆，右邊是RecyclerView。
實(shí)際效果.jpg
源碼地址：https://github.com/wenkency/CommAdapter
九纷纫、感謝
鴻洋大神的
1.Android 快速開發(fā)系列 打造萬(wàn)能的ListView GridView 適配器
2.為RecyclerView打造通用Adapter 讓RecyclerView更加好用
