RecyclerView多条目

RecyclerView多条目实现:

需要依赖:compile 'com.android.support:recyclerview-v7:26.0.0-alpha1'

然后在,MainActivity中给每个item做添加数据的方法

然后调用他的适配器继承RecyclerView.Adapter<RecyclerView.ViewHolder>

给他设置一个bean类初始化他每个item的数据

创建每个item的ViewHolder类并且创建他的基类用来初始化他的item布局的控件

在设配器类中的onCreateViewHolder方法中添加他们不同item的布局然后在onBindViewHolder

通过调用基类来调用到每个item控件的类来实现数据添加到适配器中

最后则是把适配器在MainActivity中调用添加到RecyclerView中另外哦可以用判断使RecyclerView

实既有 GridView效果又有listview效果

MainActivity:

/**

* 实现Recycleview多布局效果

* 1.搭建环境(添加依赖,添加控件,初始化控件)

* 2.初始化数据

* 3.创建适配器

* 4.设置适配器,布局管理器

*/

public class MainActivity extends AppCompatActivity {

private RecyclerView recyclerView;

private List<DataModel> list;

int colors[] = {android.R.color.holo_blue_light,

android.R.color.holo_orange_light,

android.R.color.holo_red_light};

private DemoAdapter madapter;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

recyclerView = (RecyclerView) findViewById(R.id.recyclerview);

//初始化数据

initData();

//创建适配器

madapter = new DemoAdapter(this, list);

//设置适配器

recyclerView.setAdapter(madapter);

//设置布局管理器,否则无法正常显示 1.上下文2.规定排列顺序是横是竖,3.排列的正反顺序

// recyclerView.setLayoutManager(new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));

//listview和gridview效果混排,无论一行两列还是一行一列都是gridlayoutmanager

//做了一个监听,根据不同类型,让其显示一行一列还是一行两列

final GridLayoutManager manager=new GridLayoutManager(this,2);

recyclerView.setLayoutManager(manager);

manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {

@Override

public int getSpanSize(int position) {

int type=recyclerView.getAdapter().getItemViewType(position);

if (type==DataModel.TYPE_THEE){

return manager.getSpanCount();

}else{

return 1;

}

}

});

}

/**

* Type:分类型

* string name

* string content

* color

*/

private void initData() {

//创建一个集合存放Bean类

list = new ArrayList<>();

//创建20条item

for (int i = 0; i < 20; i++) {

int type = 0;//= (int) (Math.random()*3+1);

if (i<5||i>15){

type=2;

}else if (i>5||i<8){

type=3;

}else if (i>=8||i<=15){

type=1;

}

//创建Bean类

DataModel data=new DataModel();

//实际开发中,则是解析服务器拿到数据

data.avatarColor=colors[type-1];

data.type=type;

data.name=""+i;

data.content="Content"+i;

data.contentColor=colors[(type+1)%3];

list.add(data);

}

}

}

Bean类:

public class DataModel {

public static final int TYPE_ONE=1;

public static final int TYPE_TOW=2;

public static final int TYPE_THEE=3;

public int type;

public int avatarColor;

public String name;

public String content;

public int contentColor;

}

适配器类:

/**

* Created by 小亚 on 2017/9/8.

* RecvcleView多布局适配器

* 1.创建一个类继承RecycleView的

* 2.定义RecycleView.ViewHolder以方便多布局

* 3.创建三种类型的item布局及ViewHolder

* 4.使用GetitemViewType方法

* 5.在onCreateViewHolder和onBindViewHolder进行ViewHolder的创建,数据的判断加载

*

*/

class DemoAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{

//布局填充器

private final LayoutInflater mLayoutInflater;

private List<DataModel> mList=new ArrayList<>();

//private Context Context;

private TypeOneViewHolder one;

private TypeTwoViewHolder two;

private TypeThreeViewHolder three;

DataModel data=new DataModel();

public DemoAdapter(Context Context, List<DataModel> list) {

mLayoutInflater = LayoutInflater.from(Context);

this.mList = list;

}

@Override

public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

switch (viewType){

case DataModel.TYPE_ONE:

one = new TypeOneViewHolder(mLayoutInflater.inflate(R.layout.item_type_one,parent,false));

return new TypeOneViewHolder( mLayoutInflater.inflate(R.layout.item_type_one,parent,false));

case DataModel.TYPE_TOW:

two = new TypeTwoViewHolder( mLayoutInflater.inflate(R.layout.item_type_two,parent,false));

return new TypeTwoViewHolder( mLayoutInflater.inflate(R.layout.item_type_two,parent,false));

case DataModel.TYPE_THEE:

three = new TypeThreeViewHolder(mLayoutInflater.inflate(R.layout.item_type_three,parent,false));

return new TypeThreeViewHolder( mLayoutInflater.inflate(R.layout.item_type_three,parent,false));

}

return null;

}

@Override

public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

((TypeAbstractViewHolder)holder).bindHolder(mList.get(position));

}

//根据不同的Position位置返回不同类型

@Override

public int getItemViewType(int position) {

return mList.get(position).type;

}

@Override

public int getItemCount() {

return mList.size();

}

}

每个item控件的类:

/**

* Created by 小亚 on 2017/9/8.

*/

public class TypeOneViewHolder extends TypeAbstractViewHolder{

private TextView name;

private ImageView avatar;

public TypeOneViewHolder(View itemView) {

super(itemView);

avatar = (ImageView) itemView.findViewById(R.id.avatar);

name = (TextView) itemView.findViewById(R.id.name);

}

@Override

public void bindHolder(DataModel model) {

name.setText(model.name);

avatar.setBackgroundResource(model.avatarColor);

}

}

基类:

/**

* Created by 小亚 on 2017/9/8.

* 抽取基类的原则

* 1.子类共有的,且实现相同的逻辑,抽取到基类中

* 2.子类共有.但实现不同逻辑,抽象方法形式定义

*/

public abstract class TypeAbstractViewHolder extends RecyclerView.ViewHolder{

public TypeAbstractViewHolder(View itemView) {

super(itemView);

}

public abstract void bindHolder(DataModel model);

}