AdapterViewFlipper

使用AdapterViewFiller组件设置图片轮播，该组件可以自动切换view

<?xml version="1.0" encoding="utf-8" ?>
<RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    <AdapterViewFlipper
            android:id="@+id/flipper"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:flipInterval="5000"
            android:layout_alignParentTop="true"/>
    <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_alignParentStart="true"
            android:onClick="prev"
            android:text="上一个"/>
    <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_centerHorizontal="true"
            android:onClick="next"
            android:text="下一个"/>
    <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_alignParentEnd="true"
            android:onClick="auto"
            android:text="自动播放"/>
</RelativeLayout>

package com.example.adapterviewflipper

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.view.ViewGroup
import android.widget.AdapterViewFlipper
import android.widget.BaseAdapter
import android.widget.ImageView

class MainActivity : AppCompatActivity() {

    private var imageIds = intArrayOf(R.drawable.shuangzi, R.drawable.shuangyu,
        R.drawable.chunv, R.drawable.tiancheng, R.drawable.tianxie,
        R.drawable.sheshou, R.drawable.juxie, R.drawable.shuiping,
        R.drawable.shizi, R.drawable.baiyang, R.drawable.jinniu, R.drawable.mojie)
    private var flipper: AdapterViewFlipper? = null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        flipper = findViewById(R.id.flipper)
        // 创建一个BaseAdapter对象，该对象负责提供AdapterViewFlipperTest所显示的列表项
        val adapter = object : BaseAdapter()
        {
            override fun getCount(): Int
            {
                return imageIds.size
            }

            override fun getItem(position: Int): Any
            {
                return position
            }

            override fun getItemId(position: Int): Long
            {
                return position.toLong()
            }

            // 该方法返回的View代表了每个列表项
            override fun getView(position: Int, convertView: View?, parent: ViewGroup): View
            {
                val imageView: ImageView
                if (convertView == null)
                {
                    // 创建一个ImageView
                    imageView = ImageView(this@MainActivity)
                    imageView.setImageResource(imageIds[position])
                    // 设置ImageView的缩放类型
                    imageView.scaleType = ImageView.ScaleType.FIT_XY
                    // 为imageView设置布局参数
                    imageView.layoutParams = ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)
                }
                else
                {
                    imageView = convertView as ImageView
                }
                return imageView
            }
        }
        flipper!!.adapter = adapter
    }

    fun prev(source: View)
    {
        // 显示上一个组件
        flipper!!.showPrevious()
        // 停止自动播放
        flipper!!.stopFlipping()
    }

    fun next(source: View)
    {
        // 显示下一个组件。
        flipper!!.showNext()
        // 停止自动播放
        flipper!!.stopFlipping()
    }

    fun auto(source: View)
    {
        // 开始自动播放
        flipper!!.startFlipping()
    }
}