RecyclerView 学习(一)

最新推荐文章于 2022-07-02 15:23:12 发布

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最新推荐文章于 2022-07-02 15:23:12 发布

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分类专栏： RecycleView 文章标签： Android

本文链接：https://blog.youkuaiyun.com/csm0401/article/details/98101156

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1 篇文章

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这篇博客介绍了Android中RecyclerView的使用，从创建item布局文件开始，逐步讲解如何设置activity布局、加载配置参数，最后详细阐述了adapter的编写过程。

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1.创建item布局文件

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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="wrap_content">

    <androidx.appcompat.widget.AppCompatImageView
        android:id="@+id/appCompatImageView"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="12dp"
        android:background="@drawable/ic_warning"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:ignore="MissingConstraints" />

    <TextView
        android:id="@+id/tv_item"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="36dp"
        android:layout_marginTop="12dp"
        android:text="总路"
        app:layout_constraintStart_toEndOf="@+id/appCompatImageView"
        app:layout_constraintTop_toTopOf="parent"
        tools:ignore="MissingConstraints" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="24dp"
        android:layout_marginTop="16dp"
        android:layout_marginBottom="8dp"
        android:text="欠压告警"
        android:textColor="@color/colorAccent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toEndOf="@+id/appCompatImageView"
        app:layout_constraintTop_toBottomOf="@+id/tv_item"
        app:layout_constraintVertical_bias="0.0"
        tools:ignore="MissingConstraints" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="76dp"
        android:layout_marginBottom="8dp"
        android:text="2019/08/01 20:39:10"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.516" />


</androidx.constraintlayout.widget.ConstraintLayout>

2.创建activity布局文件

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/list_my"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:layout_editor_absoluteX="8dp"
        tools:layout_editor_absoluteY="8dp"
        tools:ignore="MissingConstraints" />

</androidx.constraintlayout.widget.ConstraintLayout>

3.加载布局配置参数

 viewById = findViewById(R.id.list_my);

        // 给每个item添加分割线
        viewById.addItemDecoration(new DividerItemDecoration(this, VERTICAL));
        // 设置item增加和移除的动画
        viewById.setItemAnimator(new DefaultItemAnimator());
        // 设置布局管理器
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        viewById.setLayoutManager(linearLayoutManager);

        viewById.setAdapter(new Myadapter(this));

4.编写adapter

private class Myadapter extends RecyclerView.Adapter<Myadapter.MyViewHolder> {
        Context mContext;
        private LayoutInflater inflater;
        MyViewHolder holder;

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

        @NonNull
        @Override
        public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            View view = LayoutInflater.from(mContext).inflate(R.layout.item_home, parent, false);
            holder = new MyViewHolder(view);
            return holder;
        }

        @Override
        public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
            holder.tv.setText( "123");
        }

        @Override
        public int getItemCount() {
            return 5;
        }


        class MyViewHolder extends RecyclerView.ViewHolder {
            TextView tv;
            public MyViewHolder(View view) {
                super(view);
                tv=(TextView) view.findViewById(R.id.tv_item);
            }

        }
    }

注：

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.DefaultItemAnimator;
import androidx.recyclerview.widget.DividerItemDecoration;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

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