CardView的基本使用

1. CardView   

CardView是用于实现卡片式布局效果的重要控件，实际上也是一个frameLayout,只是额外提供了圆角和阴影，看上去有立体效果。

效果如下：

 

MainActivity

package com.example.mycardview;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class MainActivity extends AppCompatActivity {
    private Fruit[] fruits = {new Fruit("Apple", R.drawable.apple), new Fruit("Banana", R.drawable.banana),
            new Fruit("Orange", R.drawable.orange), new Fruit("Watermelon", R.drawable.watermelon),
            new Fruit("Pear", R.drawable.pear), new Fruit("Grape", R.drawable.grape),
            new Fruit("Pineapple", R.drawable.pineapple), new Fruit("Strawberry", R.drawable.strawberry),
            new Fruit("Cherry", R.drawable.cherry), new Fruit("Mango", R.drawable.mango)};
    private List fruitList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initFruits();
        RecyclerView rl = findViewById(R.id.rl);
        GridLayoutManager layoutManager = new GridLayoutManager(this, 2);
        rl.setLayoutManager(layoutManager);
        FruitAdapter adapter = new FruitAdapter(fruitList);
        rl.setAdapter(adapter);
    }

    private void initFruits() {
        fruitList.clear();
        for (int i = 0; i < 50; i++) {
            Random random = new Random();
            int index = random.nextInt(fruits.length);
            fruitList.add(fruits[index]);
        }
    }
}

MainActivity  .xml

adapter:

package com.example.mycardview;

import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.cardview.widget.CardView;
import androidx.recyclerview.widget.RecyclerView;

import com.bumptech.glide.Glide;

import java.util.List;

public class FruitAdapter extends RecyclerView.Adapter {

    private static final String TAG = "FruitAdapter";

    private Context mContext;

    private List mFruitList;

    static class ViewHolder extends RecyclerView.ViewHolder {
        CardView cardView;
        ImageView fruitImage;
        TextView fruitName;

        public ViewHolder(View view) {
            super(view);
            cardView = (CardView) view;
            fruitImage = (ImageView) view.findViewById(R.id.fruit_image);
            fruitName = (TextView) view.findViewById(R.id.fruit_name);
        }
    }

    public FruitAdapter(List fruitList) {
        mFruitList = fruitList;
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if (mContext == null) {
            mContext = parent.getContext();
        }
        View view = LayoutInflater.from(mContext).inflate(R.layout.fruit_item, parent, false);
        final ViewHolder holder = new ViewHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Fruit fruit = mFruitList.get(position);
        holder.fruitName.setText(fruit.getName());
        Glide.with(mContext).load(fruit.getImageId()).into(holder.fruitImage);
    }

    @Override
    public int getItemCount() {
        return mFruitList.size();
    }

}

item:

Fruit 

package com.example.mycardview;
public class Fruit {

    private String name;

    private int imageId;

    public Fruit(String name, int imageId) {
        this.name = name;
        this.imageId = imageId;
    }

    public String getName() {
        return name;
    }

    public int getImageId() {
        return imageId;
    }

}

 

2.AppBarLayout

当toolbar和RecyclerView一起共用的时候，RV遮挡了toolbar如下：

这个时候可以使用AppBarLayout，他实际是一个垂直的linearLayout,修改代码：

 

AppBarLayout包裹Toolbar

 

app:layout_behavior="@string/appbar_scrolling_view_behavior"

效果如下，但是toolbar遮挡了部分rv

可以使用CoordinatorLayout解决：

使用CoordinatorLayout将所有的布局包裹一下：

转发标明出处：https://blog.csdn.net/qq_35698774/article/details/108112074

点击下载

 

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感谢：郭霖的《第一行代码 第二版》