Recyclerview添加头布局和尾布局、item点击事件详解

简介:

本篇博客主要包括recyclerview添加多种布局以及添加头布局和尾布局,还有item点击事件

思路:

主要重写Recyclerview.Adapter中的一些方法

  1.public int getItemCount()  item熟练  +2(头布局和尾布局)

  2.public int getItemViewType(int position)   判断position 设置itemType

  3.创建不同的ViewHolder,分别用来加载头布局,正常布局,尾布局

  4.public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)  根据viewType的不同返回不同的viewholder

  5.public void onBindViewHolder(RecyclerView.ViewHolder holder, int position)  根据holder的不同绑定不同的数据 

案例:

主布局中只有一个Recyclerview,里面的item除了基本的两种类型,还有头布局和尾布局,点击基本类型跳转到另外一个Activity,显示图片

下面主要贴出Adapter和MainActivity中的代码,其他的布局文件,类比较简单就不贴出了

1.Adapter

public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> implements View.OnClickListener {

private Context context;

private List<Person> datas;

private static final int ITEM_ONE=1;

private static final int ITEM_TWO=2;

private static final int ITEM_HEAD=3;

private static final int ITEM_FOOT=4;

private int headViewCount=1;

private int footViewCount=1;

private OnItemClickListener onItemClickListener;

public MyAdapter(Context context, List<Person> datas) {

this.context = context;

this.datas = datas;

}

@Override

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

if(viewType==ITEM_HEAD){

View view= LayoutInflater.from(context).inflate(R.layout.item_head,parent,false);

return new HeaderViewHolder(view);

}else if(viewType==ITEM_FOOT){

View view=LayoutInflater.from(context).inflate(R.layout.item_foot,parent,false);

return new FootViewHolder(view);

}

else if(viewType==ITEM_ONE){

View view= LayoutInflater.from(context).inflate(R.layout.item_recyclerview,parent,false);

return new ViewHolder(view);

}else if(viewType==ITEM_TWO){

View view=LayoutInflater.from(context).inflate(R.layout.item_recyclerview2,parent,false);

return new ViewHolder(view);

}

return null;

}

@Override

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

if(holder instanceof HeaderViewHolder){

}else if(holder instanceof FootViewHolder){

}

else if(holder instanceof ViewHolder){

//注意除去头布局

holder.itemView.setTag(position-1);

holder.itemView.setOnClickListener(this);

((ViewHolder)holder).img.setBackgroundResource(datas.get(position-1).getImgId());

((ViewHolder)holder).tv1.setText(datas.get(position-1).getName());

((ViewHolder)holder).tv2.setText(datas.get(position-1).getDetail());

}

}

@Override

public int getItemCount() {

if(datas==null){

return headViewCount+footViewCount;

}

return datas.size()+headViewCount+footViewCount;

}

@Override

public int getItemViewType(int position) {

if(isHeadView(position)){

return ITEM_HEAD;

}

if(isFootView(position)){

return ITEM_FOOT;

}

if(position%2==0){

return ITEM_ONE;

}else{

return ITEM_TWO;

}

}

public boolean isHeadView(int position){

return headViewCount!=0&&position<headViewCount;

}

public boolean isFootView(int position){

return footViewCount!=0&&position>=(datas.size()+headViewCount);

}

@Override

public void onClick(View view) {

if(onItemClickListener!=null){

onItemClickListener.onItemClick(view, (Integer) view.getTag());

}

}

class ViewHolder extends RecyclerView.ViewHolder{

TextView tv1,tv2;

ImageView img;

public ViewHolder(View itemView) {

super(itemView);

tv1=itemView.findViewById(R.id.tv1);

tv2=itemView.findViewById(R.id.tv2);

img=itemView.findViewById(R.id.img);

}

}

class HeaderViewHolder extends RecyclerView.ViewHolder{

public HeaderViewHolder(View itemView) {

super(itemView);

}

}

class FootViewHolder extends RecyclerView.ViewHolder{

public FootViewHolder(View itemView) {

super(itemView);

}

}

public void setOnItemClickListener(OnItemClickListener onItemClickListener){

this.onItemClickListener=onItemClickListener;

}

interface OnItemClickListener{

void onItemClick(View view,int position);

}

} 

2.MainActivity

public class MainActivity extends AppCompatActivity implements MyAdapter.OnItemClickListener {

private RecyclerView recyclerView;

private List<Person> datas;

private MyAdapter adapter;

private int[] imgs={R.drawable.p1,R.drawable.p2,R.drawable.p3,R.drawable.p4,R.drawable.p5,R.drawable.pic1,

R.drawable.pic2,R.drawable.pic3,R.drawable.pic4,R.drawable.pic5,R.drawable.pic6};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

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

initData();

initRecyclerView();

}

private void initRecyclerView() {

recyclerView.setLayoutManager(new LinearLayoutManager(this));

adapter=new MyAdapter(this,datas);

adapter.setOnItemClickListener(this);

recyclerView.setAdapter(adapter);

}

private void initData() {

datas=new ArrayList<>();

for(int i=0;i<imgs.length;i++){

Person p=new Person();

p.setName("hahfa"+i);

p.setDetail("今天是星期一,还有5天才能休息"+i);

p.setImgId(imgs[i]);

datas.add(p);

}

}

@Override

public void onItemClick(View view, int position) {

Intent intent=new Intent(MainActivity.this,ImageActivity.class);

intent.putExtra("imgId",datas.get(position).getImgId());

startActivity(intent);

}

}

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