学Android的时候，找视频在慕课网上看到了个优雅使用RecyclerView实现复杂布局的视频，然后封装了一个通用的Adapter
任何RecyclerView都可以用的，而且只需要写一个匿名内部类就可以实现数据渲染，还是很好用的
先上图
万能适配器代码
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.List;
public abstract class MyRecyclerViewAdapter<T> extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
protected List<T> list;
private Context context;
protected LayoutInflater inflater;
private OnItemClickListener onItemClickListener;
public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
this.onItemClickListener = onItemClickListener;
}
public MyRecyclerViewAdapter(Context context, List<T> list) {
this.context = context;
this.list = list;
inflater = LayoutInflater.from(context);
}
@Override
public abstract RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType);
@Override
@SuppressWarnings("unchecked")
public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {
((TypeViewHolder) holder).bindHolder(list.get(position));
//添加点击事件
if(onItemClickListener != null) {
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 abstract int getItemViewType(int position);
@Override
public int getItemCount() {
return list.size();
}
/**
* -----------------------------------------------------------------------------------------------
*/
public abstract class TypeViewHolder extends RecyclerView.ViewHolder {
private View convertView;
private SparseArray<View> views = new SparseArray<>();
public TypeViewHolder(View itemView) {
super(itemView);
this.convertView = itemView;
}
@SuppressWarnings("unchecked")
public <V extends View> V getView(int viewId) {
View view = views.get(viewId);
if(view == null) {
view = convertView.findViewById(viewId);
views.put(viewId, view);
}
return (V) view;
}
public TypeViewHolder setText(int viewId, String text) {
TextView textView = getView(viewId);
textView.setText(text);
return this;
}
public TypeViewHolder setBackgroundColor(int viewId, int colorId) {
ImageView imageView = getView(viewId);
imageView.setBackgroundResource(colorId);
return this;
}
public abstract void bindHolder(T model);
}
/**
* -----------------------------------------------------------------------------------------------
*/
public interface OnItemClickListener {
void onItemClick(View view, int position);
void onItemLongClick(View view, int position);
}
/**
* -----------------------------------------------------------------------------------------------
*/
public static class DividerItemDecoration extends RecyclerView.ItemDecoration {
private final int[] ATTRS = new int[]{
android.R.attr.listDivider
};
public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
private Drawable mDivider;
private int mOrientation;
public DividerItemDecoration(Context context, int orientation) {
final TypedArray a = context.obtainStyledAttributes(ATTRS);
mDivider = a.getDrawable(0);
a.recycle();
setOrientation(orientation);
}
public void setOrientation(int orientation) {
if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
throw new IllegalArgumentException("invalid orientation");
}
mOrientation = orientation;
}
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
if (mOrientation == VERTICAL_LIST) {
drawVertical(c, parent);
} else {
drawHorizontal(c, parent);
}
}
public void drawVertical(Canvas c, RecyclerView parent) {
final int left = parent.getPaddingLeft();
final int right = parent.getWidth() - parent.getPaddingRight();
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = parent.getChildAt(i);
android.support.v7.widget.RecyclerView v = new android.support.v7.widget.RecyclerView(parent.getContext());
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
.getLayoutParams();
final int top = child.getBottom() + params.bottomMargin;
final int bottom = top + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
public void drawHorizontal(Canvas c, RecyclerView parent) {
final int top = parent.getPaddingTop();
final int bottom = parent.getHeight() - parent.getPaddingBottom();
final int childCount = parent.getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = parent.getChildAt(i);
final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
.getLayoutParams();
final int left = child.getRight() + params.rightMargin;
final int right = left + mDivider.getIntrinsicHeight();
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(c);
}
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
if (mOrientation == VERTICAL_LIST) {
outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
} else {
outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
}
}
}
}
使用方法
recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
adapter = new MyRecyclerViewAdapter<DataModel>(this, list) {
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
switch (viewType) {
case DataModel.TYPE_ONE:
return new TypeViewHolder(inflater.inflate(R.layout.item_type_one, parent, false)) {
@Override
public void bindHolder(DataModel model) {
this.setText(R.id.name, model.name);
this.setBackgroundColor(R.id.avatar, model.avatarColor);
}
};
case DataModel.TYPE_TWO:
return new TypeViewHolder(inflater.inflate(R.layout.item_type_two, parent, false)) {
@Override
public void bindHolder(DataModel model) {
this.setText(R.id.name, model.name).setText(R.id.content, model.content);
this.setBackgroundColor(R.id.avatar, model.avatarColor);
}
};
case DataModel.TYPE_THREE:
return new TypeViewHolder(inflater.inflate(R.layout.item_type_three, parent, false)) {
@Override
public void bindHolder(DataModel model) {
this.setText(R.id.name, model.name).setText(R.id.content, model.content);
this.setBackgroundColor(R.id.avatar, model.avatarColor).setBackgroundColor(R.id.contentImage, model.contentColor);
}
};
}
return null;
}
@Override
public int getItemViewType(int position) {
return list.get(position).type;
}
};
recyclerView.setAdapter(adapter);
列表分割线
recyclerView.addItemDecoration(new MyRecyclerViewAdapter.DividerItemDecoration(this, MyRecyclerViewAdapter.DividerItemDecoration.VERTICAL_LIST));
//注意 DividerItemDecoration 这个类要用 MyRecyclerViewAdapter下的，不要用Android SDK里的
列表点击事件用法
adapter.setOnItemClickListener(new MyRecyclerViewAdapter.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
//TODO
}
@Override
public void onItemLongClick(View view, int position) {
//TODO
}
});
列表点击波纹效果
创建波纹效果文件
<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="#D7D7D7">
<item android:drawable="@android:color/white"/>
</ripple>
在RecyclerView的item布局里引入即可
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/touch_bg"
android:orientation="horizontal"
android:padding="10dp">
...
</LinearLayout>
上拉加载更多
利用viewType来动态的增加删除FooterView
创建一个加载更多的View
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="vertical">
<ProgressBar
android:id="@+id/icon_loading"
android:layout_width="wrap_content"
android:layout_height="64dp" />
</LinearLayout>
原理：引用：http://blog.csdn.net/never_cxb/article/details/50759109
注意 onPreExecute() 给 mArticleList 增加了一个null标记Footer，如果是第一次进入页面（mArticleList为空）不需要加Footer。
当数据加载完毕后，用 mArticleList.remove(mArticleList.size() - 1);把最下面的Footer删除。
再用 mArticleList.addAll(moreArticles); 增加新增的新闻数据，
并用 mAdapter.notifyDataSetChanged(); 通知 RecyclerView.Adapter 有数据改变。
代码实现
private loading = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
//...
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
int totalItemCount = layoutManager.getItemCount();
int lastVisibleItem = layoutManager.findLastVisibleItemPosition();
if (!loading && totalItemCount < lastVisibleItem + 3) {
page++;
initData();
loading = true;
}
}
});
//...
}
private void initData() {
//TODO
if(page > 1) {
data.remove(data.size()-1);
}
data.addAll("网络请求返回的数据");
data.add(data.size(), null);
loading = false;
}
另外还要对Adapter里实现的方法做一下处理
adapter = new MyRecyclerViewAdapter<DataModel>(this, list) {
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
switch (viewType) {
case -1://viewType为-1的时候，就显示FooterView（这里的-1，可以在getItemViewType()方法里进行修改）
return new TypeViewHolder(inflater.inflate(R.layout.footer_load_more, parent, false)) {
@Override
public void bindHolder(Data model) {}
};
case DataModel.TYPE_ONE:
return new TypeViewHolder(inflater.inflate(R.layout.item_type_one, parent, false)) {
@Override
public void bindHolder(DataModel model) {
this.setText(R.id.name, model.name);
this.setBackgroundColor(R.id.avatar, model.avatarColor);
}
};
case DataModel.TYPE_TWO:
return new TypeViewHolder(inflater.inflate(R.layout.item_type_two, parent, false)) {
@Override
public void bindHolder(DataModel model) {
this.setText(R.id.name, model.name).setText(R.id.content, model.content);
this.setBackgroundColor(R.id.avatar, model.avatarColor);
}
};
case DataModel.TYPE_THREE:
return new TypeViewHolder(inflater.inflate(R.layout.item_type_three, parent, false)) {
@Override
public void bindHolder(DataModel model) {
this.setText(R.id.name, model.name).setText(R.id.content, model.content);
this.setBackgroundColor(R.id.avatar, model.avatarColor).setBackgroundColor(R.id.contentImage, model.contentColor);
}
};
}
return null;
}
@Override
public int getItemViewType(int position) {
if(super.list.get(position) == null) return -1;
return list.get(position).type;
}
};
关于加载更多那块的代码还可以进行封装一下，有兴趣的朋友可以试试
就是这么简单，一个好的封装，可以省多少事呀！
参考
- http://www.imooc.com/learn/731
- http://blog.csdn.net/lmj623565791/article/details/45059587
- http://blog.csdn.net/never_cxb/article/details/50759109
- http://www.jianshu.com/p/65d2355feb4b