Android之RecycleView（3)

Android之RecycleView（1)
Android之RecycleView（2)

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瀑布流
PuRecycleViewActivity.java以及对应页面布局

package com.example.test0508.RecyclerView;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.StaggeredGridLayoutManager;

import android.content.Context;
import android.graphics.Rect;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.example.test0508.R;

public class PuRecycleViewActivity extends AppCompatActivity {

    private RecyclerView mRvPu;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_pu_recycle_view);
        mRvPu = findViewById(R.id.rv_pu);
        mRvPu.setLayoutManager(new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL));
        mRvPu.setAdapter(new StagerredAdaptor(PuRecycleViewActivity.this));
        mRvPu.addItemDecoration(new MyDecoration());
    }

    class MyDecoration extends RecyclerView.ItemDecoration{
        @Override
        public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
            super.getItemOffsets(outRect, view, parent, state);
            int gap = getResources().getDimensionPixelSize(R.dimen.dividerHeight2) ;
            outRect.set(gap,gap,gap,gap);
        }
    }
}

class StagerredAdaptor extends RecyclerView.Adapter<StagerredAdaptor.PuViewHolder>{
    Context mContext;

    public StagerredAdaptor(Context mContext) {
        this.mContext = mContext;
    }


    @NonNull
    @Override
    public StagerredAdaptor.PuViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return new PuViewHolder(LayoutInflater.from(mContext).inflate(R.layout.layout_pu_item,parent,false));
    }

    @Override
    public void onBindViewHolder(@NonNull StagerredAdaptor.PuViewHolder holder, int position) {
        if (position % 2 == 0){
            Glide.with(mContext).load("https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1589103035&di=dc1056a67b57cbfd46d2dd6f35a3f2ef&src=http://img.mingxing.com/upload/thumb/2015/09-25/0-eLomMg.jpg").into(holder.imageView);
        }else {
            holder.imageView.setImageResource(R.drawable.like_filled);
        }

    }

    @Override
    public int getItemCount() {
        return 30;
    }

    class PuViewHolder extends RecyclerView.ViewHolder{
        private ImageView imageView;
        public PuViewHolder(@NonNull View itemView) {
            super(itemView);
            imageView = itemView.findViewById(R.id.iv_pu);
        }
    }
}

<?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"
    >
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_pu"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorGreen"
        />
</LinearLayout>

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layout_pu_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="#ffffff"
    >

    <ImageView
        android:id="@+id/iv_pu"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:scaleType="centerCrop"
        />

</LinearLayout>