安卓中如何设置轮播图——banner

Posted 2021-05-26 Mr.wu123

安卓中如何设置轮播图—banner

在安卓中制作app时我们有时候需要制作轮播图，实现图片自动循环播放的功能。虽然在安卓中可以实现，但是太麻烦了，所以我们导入banner控件去实现这个功能。
具体的相关用法请参考一下文档。
banner官网

1 首先导入依赖

添加依赖

implementation 'com.youth.banner:banner:2.1.0'
implementation 'com.github.bumptech.glide:glide:4.12.0'//添加网络图片

添加网络权限，获取http权限

<uses-permission android:name="android.permission.INTERNET"/>

android:usesCleartextTraffic="true"

2 在组件中放入banner

3 逻辑代码

package com.huncm.banner;

import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.drawerlayout.widget.DrawerLayout;

import android.os.Build;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.resource.bitmap.RoundedCorners;
import com.bumptech.glide.request.RequestOptions;
import com.jaeger.library.StatusBarUtil;
import com.youth.banner.Banner;
import com.youth.banner.adapter.BannerAdapter;
import com.youth.banner.adapter.BannerImageAdapter;
import com.youth.banner.holder.BannerImageHolder;
import com.youth.banner.indicator.CircleIndicator;

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

public class MainActivity extends AppCompatActivity {

    Banner banner;
    
    List<String> stringList = new ArrayList<>();
  
    @RequiresApi(api = Build.VERSION_CODES.M)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        banner = findViewById(R.id.banner);
        stringList.add("https://ss0.baidu.com/94o3dSag_xI4khGko9WTAnF6hhy/zhidao/pic/item/a6efce1b9d16fdfabf36882ab08f8c5495ee7b9f.jpg");
        stringList.add("https://ss3.baidu.com/9fo3dSag_xI4khGko9WTAnF6hhy/zhidao/pic/item/0824ab18972bd40797d8db1179899e510fb3093a.jpg");
        stringList.add("https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=2647888545,3751969263&fm=224&gp=0.jpg");
        banner.setAdapter(new BannerImageAdapter<String>(stringList) {
            @Override
            public void onBindView(BannerImageHolder holder, String data, int position, int size) {
                Glide.with(holder.itemView).load(data).apply(RequestOptions.bitmapTransform(new RoundedCorners(30))).into(holder.imageView);
            }
        });
        banner.setIndicator(new CircleIndicator(this));
    }
}

UI的xml文件：

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout 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:id="@+id/drawlayout"
    tools:context=".MainActivity">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="100dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:background="@drawable/ax" />


    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    <com.youth.banner.Banner
        android:id="@+id/banner"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        android:layout_marginTop="200dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="32dp"
            android:text="Button"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent" />


    </androidx.constraintlayout.widget.ConstraintLayout>
    </androidx.constraintlayout.widget.ConstraintLayout>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="300dp"
        android:layout_height="match_parent"
        android:layout_gravity="left"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Button"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <ImageView
            android:id="@+id/imageView2"
            android:layout_width="match_parent"
            android:layout_height="300dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:background="@drawable/ax" />
    </androidx.constraintlayout.widget.ConstraintLayout>


</androidx.drawerlayout.widget.DrawerLayout>