Recycleview 多布局添加和cardview使用

         CardView是Android 5.0系统引入的控件，相当于FragmentLayout布局控件然后添加圆角及阴影的效果；CardView被包装为一种布局，并且经常在ListView和RecyclerView的Item布局中，作为一种容器使用。CardView应该被使用在显示层次性的内容时；在显示列表或网格时更应该被选择，因为这些边缘可以使得用户更容易去区分这些内容。 

使用地方：ListView和RecyclerView的Item布局中。cardview在所有布局外面

?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="match_parent">

 <android.support.v7.widget.CardView 

android:id="@+id/cardView" 

android:layout_width="match_parent"

 android:layout_height="wrap_content"

 android:layout_margin="10dp"> 

<LinearLayoutandroid:layout_width="match_parent" 

android:layout_height="100dp">

 <ImageView

android:layout_width="150dp" 

android:layout_height="match_parent" 

android:layout_margin="5dp" 

android:scaleType="centerCrop" 

android:src="@drawable/sng" /> 

<LinearLayoutandroid:layout_width="match_parent" 

android:layout_height="match_parent" 

android:orientation="vertical"> 

<TextView

android:layout_width="match_parent" 

android:layout_height="wrap_content"

 android:padding="5dp" 

android:text="棒冰行动"

 android:textSize="18sp" 

android:textStyle="bold" /> 

<TextView 

android:layout_width="match_parent" 

android:layout_height="wrap_content"

 android:padding="5dp" 

ndroid:text="棒冰行动，公益传播设计夏令营" /> 

</LinearLayout> 

</LinearLayout> 

</android.support.v7.widget.CardView> 

</LinearLayout>

二、cardview的activty代码

publicclassactvityextendsAppCompatActivity {  

private CardView cardView;  

@Override  

protectedvoidonCreate(Bundle savedInstanceState) { 

super.onCreate(savedInstanceState);  

setContentView(R.layout.activity_main);  

cardView = (CardView)findViewById(R.id.cardView);

cardView.setRadius(8);//设置图片圆角的半径大小

cardView.setCardElevation(8);//设置阴影部分大小 

cardView.setContentPadding(5,5,5,5);//设置图片距离阴影大小

}

三、多布局添在。意味着在adapter中即可能添加子布局1，也可能添加子布局2.甚至更复杂。

1.现在加载子布局了一个新的view2，同时我们现在需要确定的是谁到底和holder绑在一起，是view呢？还是view2呢？核心的地方在viewtype,viewtype就是我们要加载的view的是一个int值，在这里它有一个重写的方法，同时设计两个静态的变量记得赋值。

public static int bigimage=1;public static int Smallimage=2;

@Overridepublic int getItemViewType(int position) {    if(position%3==0)    {        return bigimage;    }    return Smallimage;}

2，同时要在第一个方面里面对view的类型进行判端然后加载不同同的布局，在进行反出不同的布局

 if(viewType==Smallimage)    {         view=inflater.from(parent.getContext()).inflate(R.layout.listitem,null);        return new ViewHolder(view);    }else        {            Log.e("msg","bigimage"+bigimage);            view=inflater.from(parent.getContext()).inflate(R.layout.layoutitem2,null);            return new ViewHolder2(view);        }

3.再第二个方法进行传递数据时，需要判断绑定过来的这个时候就需要判断要进行添加数据的是那个viewhoder了，所以需要进行父类向子类转型和判断

if(fatherholder instanceof ViewHolder)

ViewHolder holder=(ViewHolder)fatherholder;

fatherholder
@Overridepublic void onBindViewHolder(RecyclerView.ViewHolder fatherholder, final int position){    Log.e("msg","111111111111111111");    if(fatherholder instanceof ViewHolder)    {        Log.e("msg","88888888888888888888888888888888888");    ViewHolder holder=(ViewHolder)fatherholder;    holder.tv1.setText(list.get(position).getSongname());    holder.tv2.setText(list.get(position).getSingername());    Picasso.with(context)            .load(list.get(position).getAlbumpic_big())            .error(R.mipmap.ic_launcher)            .placeholder(R.drawable.dibu8)            .into(holder.IV);    View view=holder.itemView;    view.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View v) {            Toast.makeText(context,list.get(position).getSongname(),Toast.LENGTH_LONG).show();            manager.cutmusic(list.get(position).getUrl());            if(listen!=null) {                listen.onitemclick(v, position);            }        }    });}if(fatherholder instanceof ViewHolder2)    {        ViewHolder2 holder=(ViewHolder2)fatherholder;        Picasso.with(context)                .load(list.get(position).getAlbumpic_big())                .error(R.mipmap.ic_launcher)                .placeholder(R.drawable.dibu8)                .into(holder.IV1);        Log.e("msg","9999999999999999999999999999999999999");    }      Log.e("msg","22222222222222222222");}

4.由于现在两个布局的id不同，那么现在就需要有两个viewholder，同时在适配器开始的地方

public class recycleadapter extends RecyclerView.Adapter<recycleadapter.ViewHolder>写的也要是recycleadapter.ViewHolder，记住。

class ViewHolder extends RecyclerView.ViewHolder    {        TextView tv1,tv2;        private ImageView IV;        public ViewHolder(View itemView) {            super(itemView);//            tv = (TextView)itemView.findViewById(R.id.recycleitem);//            IV=(ImageView)itemView.findViewById(R.id.imageView10);            tv1=itemView.findViewById(R.id.textView4song);            tv2=itemView.findViewById(R.id.textViewname);            IV=itemView.findViewById(R.id.imageView5);        }    }    class ViewHolder2 extends RecyclerView.ViewHolder    {        private ImageView IV;        public ViewHolder2(View itemView) {            super(itemView);            IV=itemView.findViewById(R.id.textViewname);        }    }

//这个完整多种布局recycleview的适配器写法
public class recycleadapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{    private ArrayList<josntop.ShowapiResBodyBean.PagebeanBean.SonglistBean> list=new ArrayList<josntop.ShowapiResBodyBean.PagebeanBean.SonglistBean>();    public LayoutInflater inflater;    private Context context;    public static int bigimage=1;    public static int Smallimage=2;    int a;    private Playmanager manager;    public void setdata(ArrayList<josntop.ShowapiResBodyBean.PagebeanBean.SonglistBean> list)    {        this.list=list;        notifyDataSetChanged();    }    public recycleadapter(int a)    {         this.a=a;    }    public recycleadapter()    {    }    public void delete(int position)    {        list.remove(position);        notifyItemRemoved(position);    }    @Override    public int getItemViewType(int position) {        Log.e("msg","position"+position);        if(position%3==0)        {            return bigimage;        }        return Smallimage;    }    @Override    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)    {        View view;        context=parent.getContext();        manager= Playmanager.getinstance();        if(viewType==Smallimage)        {             view=inflater.from(parent.getContext()).inflate(R.layout.listitem,null);            return new ViewHolder(view);        }else            {                Log.e("msg","bigimage"+bigimage);                view=inflater.from(parent.getContext()).inflate(R.layout.layoutitem2,null);                return new ViewHolder2(view);            }    }    @Override    public void onBindViewHolder(RecyclerView.ViewHolder fatherholder, final int position)    {        Log.e("msg","111111111111111111");        if(fatherholder instanceof ViewHolder)        {            Log.e("msg","88888888888888888888888888888888888");        ViewHolder holder=(ViewHolder)fatherholder;        holder.tv1.setText(list.get(position).getSongname());        holder.tv2.setText(list.get(position).getSingername());        Picasso.with(context)                .load(list.get(position).getAlbumpic_big())                .error(R.mipmap.ic_launcher)                .placeholder(R.drawable.dibu8)                .into(holder.IV);        View view=holder.itemView;        view.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Toast.makeText(context,list.get(position).getSongname(),Toast.LENGTH_LONG).show();                manager.cutmusic(list.get(position).getUrl());                if(listen!=null) {                    listen.onitemclick(v, position);                }            }        });    }if(fatherholder instanceof ViewHolder2)        {            ViewHolder2 holder=(ViewHolder2)fatherholder;            Picasso.with(context)                    .load(list.get(position).getAlbumpic_big())                    .error(R.mipmap.ic_launcher)                    .placeholder(R.drawable.dibu8)                    .into(holder.IV1);            Log.e("msg","9999999999999999999999999999999999999");        }          Log.e("msg","22222222222222222222");    }    @Override    public int getItemCount() {        Log.e("msg","3333333333333333333333");        return list.size();    }    class ViewHolder extends RecyclerView.ViewHolder    {        TextView tv1,tv2;        private ImageView IV;        public ViewHolder(View itemView) {            super(itemView);//            tv = (TextView)itemView.findViewById(R.id.recycleitem);//            IV=(ImageView)itemView.findViewById(R.id.imageView10);            tv1=itemView.findViewById(R.id.textView4song);            tv2=itemView.findViewById(R.id.textViewname);            IV=itemView.findViewById(R.id.imageView5);        }    }    class ViewHolder2 extends RecyclerView.ViewHolder    {        private ImageView IV1;        public ViewHolder2(View itemView) {            super(itemView);            IV1=itemView.findViewById(R.id.item3333333333);        }    }    public  interface Onitemlisten    {        void onitemclick(View view, int position);    }    Onitemlisten listen;    public void SetOnItemclick(Onitemlisten listen)    {         this.listen=listen;    }}