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recycle);
starBT = (Button)findViewById(R.id.staggeredLayout_recycle);
// RecyclerView的三部曲 01: 获取RecyclerView对象
mRecyclerView = (RecyclerView)findViewById(R.id.my_recycler_view);
initData();
linearBT.setOnClickListener(new ButtonClicked());
gridBT.setOnClickListener(new ButtonClicked());
starBT.setOnClickListener(new ButtonClicked());
// // 添加水平分割线
// mRecyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL));
}
private void initData() {
list = new ArrayList<>();
for (int i=0;i<20;i++){
list.add("Item" + i);
}
}
class ButtonClicked implements View.OnClickListener {
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.linearLayout_recycle:
mLayoutManager = new LinearLayoutManager(getApplicationContext());
break;
case R.id.grid_recycle:
mLayoutManager = new GridLayoutManager(getApplicationContext(),4);
break;
case R.id.staggeredLayout_recycle:
//如果传入 StaggeredGridLayoutManager.VERTICAL则该布局支持纵向滑动，那么前面的 4 则指的是 4列。
//如果传入 StaggeredGridLayoutManager.HORIZONTAL，则该布局支持横向滑动，那么前面的4 则指的是 4行
mLayoutManager = new StaggeredGridLayoutManager(4,StaggeredGridLayoutManager.VERTICAL);
break;
default:
mLayoutManager = new LinearLayoutManager(getApplicationContext());
break;
}
//RecyclerView的三部曲 02：设置布局管理器
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.addItemDecoration(new DividerItemDecoration(getApplicationContext(),DividerItemDecoration.VERTICAL));
// RecyclerView的三部曲 03： 添加适配器，适配器需要重写
mMyAdapter = new RecycleAdapter(list, getApplicationContext());
mRecyclerView.setAdapter(mMyAdapter);
//设置Item增加、移除动画
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.add:
mMyAdapter.addData(1);
break;
case R.id.delete:
mMyAdapter.removeData(1);
break;
}
return true;
}
}
1.4. 重写定义Adapter
RecycleAdapter
package com.haoch95.fristapp;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import java.util.List;
import java.util.Random;
public class RecycleAdapter extends RecyclerView.Adapter<RecycleAdapter.MyViewHolder> {
private List<String> mList;
private Context context;
public RecycleAdapter(List<String> list, Context context){
this.mList = list;
this.context = context;
}
@Override
public int getItemCount() {
return mList.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView mView;
public MyViewHolder(@NonNull View itemView) {
super(itemView);
mView = itemView.findViewById(R.id.text_view);
}
}
//创建ViewHolder
//onCreateViewHolder方法创建一个viewHolder，viewholder可以理解为一条数据的展示布局，这里我们自定义类LinearViewHolder创建一个只有TextView的item
//这里我们需要创建每条布局使用的layout：recycle_item
@NonNull
@Override
public MyViewHolder onCreateViewH
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