Android RecycleView添加head配置封装的实例
这个是把RecycleView的适配器给封装了，直接调用就可以了，还添加了可以添加head头部功能，很赞的，今天记下来，下次直接用
实例代码：
package com.wwl.android;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
public abstract class BaseRecyclerAdapter<T> extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
public static final int TYPE_HEADER = 0;
public static final int TYPE_NORMAL = 1;
private ArrayList<T> mDatas = new ArrayList<>();
private View mHeaderView;
private OnItemClickListener mListener;
public void setOnItemClickListener(OnItemClickListener li) {
mListener = li;
}
public void setHeaderView(View headerView) {
mHeaderView = headerView;
notifyItemInserted(0);
}
public View getHeaderView() {
return mHeaderView;
}
public void addDatas(ArrayList<T> datas) {
mDatas.addAll(datas);
notifyDataSetChanged();
}
@Override public int getItemViewType(int position) {
if(mHeaderView == null) return TYPE_NORMAL;
if(position == 0) return TYPE_HEADER;
return TYPE_NORMAL;
}
@Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, final int viewType) {
if(mHeaderView != null && viewType == TYPE_HEADER) return new Holder(mHeaderView);
return onCreate(parent, viewType);
}
@Override public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
if(getItemViewType(position) == TYPE_HEADER) return;
final int pos = getRealPosition(viewHolder);
final T data = mDatas.get(pos);
onBind(viewHolder, pos, data);
if(mListener != null) {
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override public void onClick(View v) {
mListener.onItemClick(pos, data);
}
}
);
}
}
@Override public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
if(manager instanceof GridLayoutManager) {
final GridLayoutManager gridManager = ((GridLayoutManager) manager);
gridManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
@Override public int getSpanSize(int position) {
return getItemViewType(position) == TYPE_HEADER ? gridManager.getSpanCount() : 1;
}
}
);
}
}
@Override public void onViewAttachedToWindow(RecyclerView.ViewHolder holder) {
super.onViewAttachedToWindow(holder);
ViewGroup.LayoutParams lp = holder.itemView.getLayoutParams();
if(lp != null && lp instanceof StaggeredGridLayoutManager.LayoutParams && holder.getLayoutPosition() == 0) {
StaggeredGridLayoutManager.LayoutParams p = (StaggeredGridLayoutManager.LayoutParams) lp;
p.setFullSpan(true);
}
}
public int getRealPosition(RecyclerView.ViewHolder holder) {
int position = holder.getLayoutPosition();
return mHeaderView == null ? position : position - 1;
}
@Override public int getItemCount() {
return mHeaderView == null ? mDatas.size() : mDatas.size() + 1;
}
public abstract RecyclerView.ViewHolder onCreate(ViewGroup parent, final int viewType);
public abstract void onBind(RecyclerView.ViewHolder viewHolder, int RealPosition, T data);
public class Holder extends RecyclerView.ViewHolder {
public Holder(View itemView) {
super(itemView);
}
}
public interface OnItemClickListener<T> {
void onItemClick(int position, T data);
}
}
然后在外面自己的适配器中直接继承就可以了
package com.wwl.android;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
/** * wwl */ public class MyAdapter extends BaseRecyclerAdapter<String> {
@Override public RecyclerView.ViewHolder onCreate(ViewGroup parent, int viewType) {
View layout = LayoutInflater.from(parent.getContext()).inflate(R.layout.item, parent, false);
return new MyHolder(layout);
}
@Override public void onBind(RecyclerView.ViewHolder viewHolder, int RealPosition, String data) {
if(viewHolder instanceof MyHolder) {
((MyHolder) viewHolder).text.setText(data);
}
}
class MyHolder extends BaseRecyclerAdapter.Holder {
TextView text;
public MyHolder(View itemView) {
super(itemView);
text = (TextView) itemView.findViewById(R.id.text);
}
}
}
然后在类中调用，
public class MainActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private RecyclerView.LayoutManager mLayoutManager;
private MyAdapter mAdapter;
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = (RecyclerView) findViewById(R.id.list);
// mLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
mLayoutManager = new GridLayoutManager(this, 2);
// mLayoutManager = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
mRecyclerView.addItemDecoration(new GridItemDecoration(this, true));
mAdapter = new MyAdapter();
mRecyclerView.setAdapter(mAdapter);
mAdapter.addDatas(generateData());
setHeader(mRecyclerView);
mAdapter.setOnItemClickListener(new BaseRecyclerAdapter.OnItemClickListener<String>() {
@Override public void onItemClick(int position, String data) {
Toast.makeText(MainActivity.this, position + "," + data, Toast.LENGTH_SHORT).show();
}
}
);
}
private void setHeader(RecyclerView view) {
View header = LayoutInflater.from(this).inflate(R.layout.header, view, false);
mAdapter.setHeaderView(header);
}
private ArrayList<String> generateData() {
ArrayList<String> data = new ArrayList<String>() {
{
for(int i=0;
i<21;
i++) add("数据" + i);
}
}
;
return data;
}
}
这样就OK啦。
布局文件：
R.layout.activity_main
<?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="match_parent"> <android.support.v7.widget.RecyclerView android:id="@+id/list" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout>
header.xml
<?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:orientation="vertical"> <ImageView android:layout_gravity="center_horizontal" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@mipmap/ic_launcher"/> </LinearLayout>
item.xml
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="20dp" android:orientation="vertical"> <TextView android:id="@+id/text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="数据"/> </RelativeLayout>
以上就是Android RecycleView添加head配置封装的实例，如有疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！
