Android UI 之 RecyclerView 瀑布流

Posted 2021-08-12 Kevin_小飞象

基础用法

添加依赖

	// RecyclerAdapter
    implementation 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.30'
    // glide
    implementation 'com.github.bumptech.glide:glide:4.8.0';

1. 效果图
   

2. 布局文件
   activity_fruit.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".ui.FruitActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_fruit"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>

item_fruit

<?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="wrap_content"
    android:layout_margin="5dp"
    android:orientation="vertical">

    <ImageView
        android:id="@+id/iv_fruit"
        android:layout_width="45dp"
        android:layout_height="45dp"
        android:layout_marginTop="8dp"
        android:layout_gravity="center_horizontal"
        android:src="@mipmap/ic_apple"/>

    <TextView
        android:id="@+id/tv_fruit_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_gravity="left"/>

</LinearLayout>

2. 适配器

public class FruitAdapter extends BaseQuickAdapter<FruitBean, BaseViewHolder> {

    public FruitAdapter(int layoutResId, @Nullable List<FruitBean> data) {
        super(layoutResId, data);
    }

    @Override
    protected void convert(BaseViewHolder helper, FruitBean item) {
        ImageView image = helper.getView(R.id.iv_fruit);
        Glide.with(MyApp.getAppContext())
                .load(item.getIconId())
                .into(image);

        helper.setText(R.id.tv_fruit_name,item.getName());
    }
}

3. 逻辑代码

public class FruitActivity extends BaseActivity {
    @BindView(R.id.rv_fruit)
    RecyclerView mRecyclerView;

    private FruitAdapter mAdapter;

    @Override
    public int getLayoutId() {
        return R.layout.activity_fruit;
    }

    @Override
    public void initView() {
        mAdapter = new FruitAdapter(R.layout.item_fruit,getData());
        mAdapter.openLoadAnimation();
        StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL);
        mRecyclerView.setLayoutManager(layoutManager);
        mRecyclerView.setAdapter(mAdapter);
    }

    private List<FruitBean> getData() {
        return Arrays.asList(new FruitBean("apple",R.mipmap.ic_apple),
                new FruitBean(getRandomLengthName("banana"),R.mipmap.ic_banana),
                new FruitBean(getRandomLengthName("cherry"),R.mipmap.ic_cherry),
                new FruitBean(getRandomLengthName("grape"),R.mipmap.ic_grape),
                new FruitBean(getRandomLengthName("mango"),R.mipmap.ic_mango),
                new FruitBean(getRandomLengthName("orange"),R.mipmap.ic_orange),
                new FruitBean(getRandomLengthName("pear"),R.mipmap.ic_pear),
                new FruitBean(getRandomLengthName("pineapple"),R.mipmap.ic_pineapple),
                new FruitBean(getRandomLengthName("watermelon"),R.mipmap.ic_watermelon),
                new FruitBean(getRandomLengthName("strawberry"),R.mipmap.ic_strawberry)
                );
    }

    private String getRandomLengthName(String name) {
        Random random = new Random();
        int length = random.nextInt(20) + 1;
        StringBuilder builder = new StringBuilder();
        for (int i = 0; i < length; i++) {
            builder.append(name);
        }
        return builder.toString();
    }
}