import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.support.v7.widget.DefaultItemAnimator; import android.support.v7.widget.GridLayoutManager; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.StaggeredGridLayoutManager; import android.view.View; import android.widget.Button; import android.widget.Toast; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { private RecyclerView myview; private Button but1,but2,but3,but4,but5; private MyManger adapter; private int count=10; private Listlist=new ArrayList<>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); myview= (RecyclerView) findViewById(R.id.myrecycle); but1= (Button) findViewById(R.id.button); but2= (Button) findViewById(R.id.button2); but3= (Button) findViewById(R.id.button3); but4= (Button) findViewById(R.id.button4); but5= (Button) findViewById(R.id.button5); for (int i=0;i<=count;i++){ list.add(R.mipmap.ic_launcher+i); } myview.setLayoutManager(new LinearLayoutManager(this)); adapter=new MyManger(this,list); myview.setItemAnimator(new DefaultItemAnimator()); myview.setAdapter(adapter); but3.setOnClickListener(new View.OnClickListener() {
//默认垂直分布 @Override public void onClick(View view) { myview.setLayoutManager(new LinearLayoutManager(MainActivity.this)); adapter=new MyManger(MainActivity.this,list); myview.setItemAnimator(new DefaultItemAnimator()); myview.setAdapter(adapter); } }); but4.setOnClickListener(new View.OnClickListener() {
//网格分布 @Override public void onClick(View view) { myview.setLayoutManager(new GridLayoutManager(MainActivity.this,3)); adapter=new MyManger(MainActivity.this,list); myview.setItemAnimator(new DefaultItemAnimator()); myview.setAdapter(adapter); } }); but5.setOnClickListener(new View.OnClickListener() {
//瀑布流分布 @Override public void onClick(View view) { myview.setLayoutManager(new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL)); adapter=new MyManger(MainActivity.this,list); myview.setItemAnimator(new DefaultItemAnimator()); myview.setAdapter(adapter); } }); but1.setOnClickListener(new View.OnClickListener() {
//添加的方法 @Override public void onClick(View view) { count++; list.add(count); adapter.notifyDataSetChanged(); Toast.makeText(MainActivity.this, "加了一个", Toast.LENGTH_SHORT).show(); } }); but2.setOnClickListener(new View.OnClickListener() {
//删除的方法 @Override public void onClick(View view) { count--; list.remove(count); Toast.makeText(MainActivity.this, "减了一个", Toast.LENGTH_SHORT).show(); adapter.notifyDataSetChanged(); } }); } }
import android.content.Context; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import java.util.ArrayList; import java.util.List; /** * Created by 张超飞 on 2017/10/13. */ public class MyManger extends RecyclerView.Adapter{ private List list=new ArrayList<>(); private Context context; public MyManger(Context context, List list) { this.context = context; this.list = list; } public OnRecyclerViewItemClickListener mOnItemClickListener = null;//点击 public void setOnItemClickListener(OnRecyclerViewItemClickListener listener) { this.mOnItemClickListener = listener; } @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.item,parent,false); MyViewHolder holder=new MyViewHolder(view); return holder; } @Override public void onBindViewHolder(MyViewHolder holder, final int position) { holder.image.setImageResource(R.mipmap.ic_launcher); } @Override public int getItemCount() { return list.size(); } public class MyViewHolder extends RecyclerView.ViewHolder { ImageView image; public MyViewHolder(View itemView) { super(itemView); image=itemView.findViewById(R.id.image); itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if (mOnItemClickListener!=null){ mOnItemClickListener.onItemClick(view,getAdapterPosition()); } } }); } } }
实现一个接口
import android.view.View; /** * Created by 张超飞 on 2017/10/13. */ public interface OnRecyclerViewItemClickListener { void onItemClick(View view, int position); }