首先查看效果图，依次是线性线性垂直布局，水平布局，网络布局，瀑布流布局
#打造常用RecyclerAdapter与RecyclerView.ViewHoder基类
###1. recyclerView.ViewHoder类构建 首先我们需要创建一个继承于RecyclerView.ViewHolder的类
public class RVViewHolder extends RecyclerView.ViewHolder {
private Context mContext;
public RVViewHolder(Context context, View itemView) {
super(itemView);
this.mContext = context;
}
/**
* 通过viewId获取控件
*
* @param viewId
* @return
*/
public <T extends View> T getView(int viewId) {
View view = itemView.findViewById(viewId);
return (T) view;
}
public RVViewHolder setImageRes(int viewId, int imgRes) {
ImageView view = getView(viewId);
view.setImageResource(imgRes);
return this;
}
public RVViewHolder setImageUrl(int viewId, String imageUrl) {
ImageView view = getView(viewId);
return this;
}
public RVViewHolder setText(int viewId, String text) {
TextView tv = getView(viewId);
tv.setText(text);
return this;
}
public RVViewHolder setTextColor(int viewId, int textColor) {
TextView view = getView(viewId);
view.setTextColor(textColor);
return this;
}
public RVViewHolder setTextSize(int viewId, float size) {
TextView view = getView(viewId);
view.setTextSize(size);
return this;
}
public RVViewHolder setTextColorRes(int viewId, int textColorRes) {
TextView view = getView(viewId);
view.setTextColor(mContext.getResources().getColor(textColorRes));
return this;
}
public RVViewHolder setVisible(int viewId, boolean visible) {
View view = getView(viewId);
view.setVisibility(visible ? View.VISIBLE : View.GONE);
return this;
}
public RVViewHolder setVisiblePlaceHolder(int viewId, boolean visible) {
View view = getView(viewId);
view.setVisibility(visible ? View.VISIBLE : View.INVISIBLE);
return this;
}
/**
* 功能描述：设置各个子控件的点击事件
* 作者： hg_liuzl@qq.com
* 时间：2016/12/21 13:28
* 参数：
*/
public RVViewHolder setOnClickListener(int viewId, Object o, View.OnClickListener listener) {
View view = getView(viewId);
view.setTag(o);
view.setOnClickListener(listener);
return this;
}
}
上面代码说明:
- 创建RecyclerView.ViewHolder子类
- 获取每一个子类控件
- 常用的文字与图片设置方法
- 子控件的点击事件,我这里传了3个参数，控件的Id,对象，监听，一般用到点击事件的时候，都需要绑定数据
###2. recyclerViewAdapter 基类构造 先上代码
package king.com.recyler;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.List;
/**
* @work: 构建RecyclerView.Adapter基类
* @author: hg_liuzl(hg_liuzl@qq.com)
* @date: created at 2016/12/21 11:14
*/
public abstract class BaseRVAdapter<T> extends RecyclerView.Adapter<RVViewHolder> {
protected List<T> mList; //数据集合
protected int resLayout; //布局资源
protected Context mContext;
protected IRecyclerViewListener recyclerViewListener;
public BaseRVAdapter(Context context, List<T> mList, int resLayout) {
this.mContext = context;
this.mList = mList;
this.resLayout = resLayout;
}
@Override
public RVViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(resLayout, parent, false);
final RVViewHolder viewHolder = new RVViewHolder(mContext, view);
return viewHolder;
}
@Override
public void onBindViewHolder(final RVViewHolder viewHolder, int position) {
bindAction(viewHolder, mList.get(viewHolder.getLayoutPosition()));
/**绑定事件 一定要在这里绑定**/
if (null != recyclerViewListener) {
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
/**注意这里推荐用getAdapterPosition，界面刷新后立即就可以取得新的position**/
recyclerViewListener.onItemClick(viewHolder.itemView, viewHolder.getLayoutPosition());
}
});
viewHolder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
recyclerViewListener.onItemLongClick(viewHolder.itemView, viewHolder.getLayoutPosition());
return false;
}
});
}
bindData(viewHolder, mList.get(position));
}
/**
* 绑定数据
**/
public abstract void bindData(RVViewHolder viewHolder, T bean);
/**
* 绑定动作
**/
public abstract void bindAction(RVViewHolder viewHolder, T bean);
@Override
public int getItemCount() {
if (null != mList) {
return mList.size();
}
return 0;
}
/**
* 设置点击事件
*
* @param mIRecyclerViewListener
*/
public void setIRecyclerViewListener(IRecyclerViewListener mIRecyclerViewListener) {
this.recyclerViewListener = mIRecyclerViewListener;
}
public interface IRecyclerViewListener {
void onItemClick(View view, int position);
void onItemLongClick(View view, int position);
}
}
代码解读:
- 首先创建RecyclerAdapter的子类的抽象类,把一些需要实现的方法给子类去实现
- 添加构造方法，其中构造函数包括Context,list,布局资源 这样我们可以根据自己的需要传入相应数据类型，以及布局
- 在onBindViewHolder中添加数据以及绑定事件，另外事件的回调函数一定要判断不为空才可以调用回调方法
给Item 添加回调，使item可以点击以及长按
###3. recycler的getAdapterPostion与getLayoutPosition()坑点说明
- 根据官方说明getAdapterPosition是在变化的时候就能获取到position,而getLayoutPosition是在布局完成后可以获取到position，一般我们需要获取某个position的时候，肯定是在布局完成后获取，所以建议使用getLayoutPosition来获取position
- 另外也不要在onCreateView中获取某个实体类，很容易造成数组越界,因为这个时候getAdapterPosition为-1 在创建之前布局还没有完成,
###在子类中继承万能RecyclerViewAdapter
package king.com.recyler;
import android.content.Context;
import android.view.View;
import android.widget.Toast;
import java.util.List;
/**
*
* @work: ${功能介绍}
* @author: hg_liuzl(hg_liuzl@qq.com)
* @date: created at 2016/12/21 12:48
*/
public class FruitAdapter2 extends BaseRVAdapter implements View.OnClickListener {
public FruitAdapter2(Context context, List mList, int resLayout) {
super(context, mList, resLayout);
}
@Override
public void bindAction(RVViewHolder viewHolder, Object o) {
viewHolder.setOnClickListener(R.id.tv_name, o, this);
}
@Override
public void bindData(RVViewHolder viewHolder, Object o) {
final FruitBean bean = (FruitBean) o;
viewHolder.setText(R.id.tv_name, bean.name);
viewHolder.setText(R.id.tv_no, "编号:" + bean.id);
viewHolder.setImageRes(R.id.iv_img, bean.resourceId);
}
@Override
public void onClick(View view) {
final FruitBean bean = (FruitBean) view.getTag();
switch (view.getId()) {
case R.id.tv_name:
Toast.makeText(mContext, "你点击了Item中的" + bean.id + "----name是" + bean.name, Toast.LENGTH_SHORT).show();
break;
}
}
}
代码解读：
- 首先基础FruitAdapter继承于BaseRVAdapter,并实现其2个抽象方法
- 在bindAction方法中绑定子控件的点击事件,在bindData方法中绑定数据
- 另外实现OnClick接口，来完成点击事件
最后使用我们创建的万能基类实际调用:
/**
* 垂直布局
*/
public class RecyclerVerticalActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_recycler_view);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(layoutManager);
FruitAdapter2 adapter = new FruitAdapter2(this, FruitBean.getFruitBeans(), R.layout.fruit_item_vertical);
recyclerView.setAdapter(adapter);
adapter.setIRecyclerViewListener(recyclerViewListener);
}
private BaseRVAdapter.IRecyclerViewListener recyclerViewListener = new BaseRVAdapter.IRecyclerViewListener() {
@Override
public void onItemClick(View view, int position) {
Toast.makeText(RecyclerVerticalActivity.this, position + " click",
Toast.LENGTH_SHORT).show();
}
@Override
public void onItemLongClick(View view, int position) {
Toast.makeText(RecyclerVerticalActivity.this, position + " longClick",
Toast.LENGTH_SHORT).show();
}
};
}
- 可以看到适配器用的是FruitAdapter2
- 给Adaapter绑定回调方法，使item可以点击
最后再看看效果
