打造Android万能适配器Adapter
16lz
2021-01-23
打造Android万能适配器Adapter
adapter经常遇到，所以封装了一下，主要是从一下几个方面展开
这篇是受到两位朋友的代码启发写的，感谢一下
1.BaseAdapter的抽象方法实现：
getItem（），getCount（），getItemId()
2.getView的实现
主要是convertView和ViewHolder
3.对于viewHolder的抽象方法和绑定数据的抽象方法
4.对于数据源的封装
主要是set和get以及增删改查的加锁
5.代码实现如下：
import android.content.Context;import android.support.annotation.LayoutRes;import android.support.annotation.Nullable;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.ListView;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.List;/** * Created by 刘朋（liupeng） on 2017/4/7. */public abstract class BaseArrayAdapter extends BaseAdapter{ private List mInfos = new ArrayList<>(); private final Object mLock = new Object(); protected LayoutInflater mInflater; protected Context context; private boolean mNotifyOnChange = true; //传递context引用进来 public BaseArrayAdapter(Context context) { mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); this.context = context; } //mNotifyOnChange是一个控制的开关 @Override public void notifyDataSetChanged() { super.notifyDataSetChanged(); mNotifyOnChange = true; } public void setNotifyOnChange(boolean notifyOnChange) { mNotifyOnChange = notifyOnChange; } public Context getContext() { return context; } public int getCount() { return isEmpty() ? 0 : mInfos.size(); } public D getItem(int position) { return isEmpty() ? null : mInfos.get(position); } public long getItemId(int position) { return position; } //覆写getView @Override public View getView(int position, View convertView, ViewGroup parent) { Holder holder; D d = getItem(position); if (convertView == null) { convertView = mInflater.inflate(getLayoutId(), parent, false); holder = onCreateViewHolder(convertView); convertView.setTag(holder); } else { holder = (Holder) convertView.getTag(); } onBindViewHolder(holder, d, position, convertView); return convertView; } public abstract @LayoutRes int getLayoutId(); /** * 创建Holder */ public abstract Holder onCreateViewHolder(View convertView); /** * 绑定数据 */ public abstract void onBindViewHolder(Holder holder, D d, int position, View convertView); /** * 局部刷新的方法，如果不指明header个数，这里只考虑listView,其余按0处理 * * @param parent AdapterView * @param position 需要刷新的position,这里的position不包含header */ public void updateItem(AdapterView parent, int position) { int headerCount = 0; if (parent instanceof ListView) { headerCount = ((ListView) parent).getHeaderViewsCount(); } updateItem(parent, position, headerCount); } /** * 局部刷新的方法 * * @param parent AdapterView * @param position 需要刷新的position,这里的position不包含header * @param headerCount header个数 */ public void updateItem(AdapterView parent, int position, int headerCount) { int realPosition = position + headerCount; int firstVisiblePosition = parent.getFirstVisiblePosition(); int lastVisiblePosition = parent.getLastVisiblePosition(); // 判断position是否可见，如果可见调用updateUI方法 if (realPosition >= firstVisiblePosition && realPosition <= lastVisiblePosition) { View view = parent.getChildAt(realPosition - firstVisiblePosition); onBindViewHolder((Holder) view.getTag(), getItem(position), position, null); } } /** * 这里忽略header * @param parent * @param position * @return */ public Holder getItemHolder(AdapterView parent, int position){ return (Holder) parent.getChildAt(position).getTag(); } public void setDatas(@Nullable List infos) { mInfos = infos; notifyDataSetChanged(); } public List getDatas() { return mInfos; } public boolean isEmpty() { return mInfos == null; } public void add(D t) { synchronized (mLock) { if (isEmpty()) { return; } mInfos.add(t); } if (mNotifyOnChange) notifyDataSetChanged(); } public void addAll(List list) { synchronized (mLock) { if (isEmpty()) { return; } if (list != null) { mInfos.addAll(list); } } if (mNotifyOnChange) notifyDataSetChanged(); } public void clear() { if (isEmpty()) { return; } synchronized (mLock) { mInfos.clear(); } if (mNotifyOnChange) notifyDataSetChanged(); } public void remove(D t){ synchronized (mLock){ if(isEmpty()){ return; } if(mInfos != null){ mInfos.remove(t); } } if (mNotifyOnChange) notifyDataSetChanged(); } public void insert(D t, int index){ synchronized (mLock){ if(isEmpty()){ return; } if(mInfos != null){ mInfos.add(index,t); } } if (mNotifyOnChange) notifyDataSetChanged(); } public void sort(Comparator<? super D> comparator){ synchronized (mLock){ if(isEmpty()){ return; } if(mInfos != null){ Collections.sort(mInfos, comparator); } } if (mNotifyOnChange) notifyDataSetChanged(); }} 更多相关文章
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