布局基础<kotlin>2，自定义控件（整理自网络）

引导页

传送门

Android vector标签 PathData 画图

ViewPager

代码清单

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">
    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/bg"
        android:scaleType="centerCrop"/>

    <androidx.viewpager.widget.ViewPager
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginBottom="50dp"
        android:id="@+id/myViewPage"/>
    <LinearLayout
        android:id="@+id/dot_container"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/myViewPage"
        android:layout_centerHorizontal="true"
        android:orientation="horizontal"
        >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="..."
            android:textSize="30sp"
            android:textColor="#ccc"
            android:textStyle="bold" />
    </LinearLayout>
    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true">
        <TextView
            android:id="@+id/skipBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="30dp"
            android:text="跳过"
            android:textColor="#fff"/>
        <TextView
            android:id="@+id/nextBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_marginRight="30dp"
            android:text="下一页"
            android:textColor="#fff"/>
    </RelativeLayout>

</RelativeLayout>

page.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ImageView
        android:id="@+id/pageIcon"
        android:layout_width="match_parent"
        android:layout_height="280dp"
        android:src="@drawable/ic_face1"
        android:layout_marginTop="80dp"/>
    <TextView
        android:id="@+id/pageTitle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/page_title1"
        android:textSize="30dp"
        android:gravity="center"
        android:layout_marginTop="30dp"
        />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/page_desc"
        android:layout_margin="30dp"
        />
</LinearLayout>

ViewPagerAdapter.kt

package com.vocus.sepcialeffects

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.viewpager.widget.PagerAdapter

class ViewPagerAdapter:PagerAdapter() {

    override fun isViewFromObject(p0: View, p1: Any): Boolean {
        return p0==p1
    }

    override fun getCount(): Int {
        return 3
    }

    private val icons= intArrayOf(R.drawable.ic_face1,R.drawable.ic_face2,R.drawable.ic_face3)
    private val titles= intArrayOf(R.string.page_title1,R.string.page_title2,R.string.page_title3)

    override fun instantiateItem(container: ViewGroup, position: Int): Any {
        val page=LayoutInflater.from(container.context).inflate(R.layout.page,container,false)
        val pageIcon=page.findViewById<ImageView>(R.id.pageIcon)
        val pageTitle=page.findViewById<TextView>(R.id.pageTitle)

        pageIcon.setImageResource(icons[position])
        pageTitle.text=container.resources.getText(titles[position])

        container.addView(page)
        return page
    }

    override fun destroyItem(container: ViewGroup, position: Int, `object`: Any) {
        container.removeView(`object` as View)
    }
}

MainActivity.kt

import android.graphics.Color
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.TextView
import androidx.viewpager.widget.ViewPager
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val adpter=ViewPagerAdapter()
        myViewPage.adapter=adpter

        skipBtn.setOnClickListener{
            finish()
        }
        nextBtn.setOnClickListener{
            myViewPage.currentItem+=1
        }
        addDots()

        myViewPage.addOnPageChangeListener(object: ViewPager.OnPageChangeListener{
            override fun onPageScrollStateChanged(state: Int) {
            }

            override fun onPageScrolled(
                position: Int,
                positionOffset: Float,
                positionOffsetPixels: Int
            ) {

            }

            override fun onPageSelected(position: Int) {
                addDots(position)
            }

        })

    }

    fun addDots(posi:Int=0){
        val dots=arrayOf(TextView(this),TextView(this),TextView(this))
        dot_container.removeAllViews()
        dots.forEach {
            it.text="."
            it.textSize=30f
            it.paint.isFakeBoldText=true
            it.setTextColor(Color.GRAY)
            dot_container.addView(it)
        }
        dots[posi].setTextColor(Color.WHITE)
    }
}

效果

图片轮播（广告）

动态设置view的测试

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        var textView1= TextView(this)
        textView1.textSize = 30f
        textView1.text = "haha"
        textView1.setTextColor(Color.BLUE)
        textView1.id=R.id.textView1

        var textView2 = TextView(this)
        textView2.textSize = 30f
        textView2.text = "xixi"
        textView2.setTextColor(Color.BLUE)

        var params1=RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT)
        params1.leftMargin=20
        container.addView(textView1,params1)

        var params2=RelativeLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT)
        params2.leftMargin=20
        params2.addRule(RelativeLayout.RIGHT_OF,R.id.textView1)
        container.addView(textView2,params2)

    }

其实跟制作引导页的方法差不多

MainActivity.kt

class MainActivity : AppCompatActivity() {
    var imageViews = ArrayList<ImageView>()
    var titles = listOf<String>("图片1", "图片2", "图片3", "图片4", "图片5")
    var imagesIds = listOf<Int>(
        R.drawable.pic1,
        R.drawable.pic2,
        R.drawable.pic3,
        R.drawable.pic4,
        R.drawable.pic5
    )

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        var textView = findViewById<TextView>(R.id.myTitle)

        //需要初始化一下
        textView.text = titles[0]
        textView.setTextColor(Color.WHITE)

        var prePosition = 0

        for (i in 0 until imagesIds.size) {
            var imageView = ImageView(this)

            imageView.setBackgroundResource(imagesIds[i])
            imageViews.add(imageView)

            var point = ImageView(this)
            //point_selector.xml要自己创建
            point.setBackgroundResource(R.drawable.point_selector)
            if (i == 0) point.isEnabled = true else point.isEnabled = false
            var params = LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.WRAP_CONTENT,
                ViewGroup.LayoutParams.WRAP_CONTENT
            )
            params.leftMargin = 5
            pointGroup.addView(point, params)

        }

        myViewPager.adapter = myPagerView(imageViews)

        myViewPager.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {
            override fun onPageScrollStateChanged(state: Int) {
            }

            override fun onPageScrolled(
                position: Int,
                positionOffset: Float,
                positionOffsetPixels: Int
            ) {
            }

            override fun onPageSelected(position: Int) {
                textView.text = titles[position]

                pointGroup.getChildAt(prePosition).isEnabled = false
                pointGroup.getChildAt(position).isEnabled = true
                prePosition = position
            }

        })
    }

    class myPagerView() : PagerAdapter() {
        private val imageViews = ArrayList<ImageView>()

        constructor(imageViews: ArrayList<ImageView>) : this() {
            this.imageViews.addAll(imageViews)
        }

        override fun isViewFromObject(view: View, `object`: Any): Boolean {
            return view == `object`
        }

        override fun getCount(): Int {

            return 5
        }

        override fun instantiateItem(container: ViewGroup, position: Int): Any {
            var view = imageViews.get(position)
            container.addView(view)
            return view
        }

        override fun destroyItem(container: ViewGroup, position: Int, `object`: Any) {
            //super.destroyItem(container, position, `object`)
            container.removeView(`object` as View)
        }
    }

}

point_selector.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/point_normal" android:state_enabled="false"></item>

    <item android:drawable="@drawable/point_press" android:state_enabled="true"></item>
</selector>

point_normal.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="oval">
    <size android:width="5dp" android:height="5dp"/>
    <solid android:color="#44000000"/>
</shape>

不过还要加上左右无限滑动和自动滑动。。

加上无限滑动只要把

override fun getCount(): Int {}中 返回的页面数改成Int.MAX_VALUE
在根据position获得图片列表资源的时候对position%viewImages.size取模
最后把当前页面位置设置为总页数的中间myViewPager.currentItem= Int.MAX_VALUE/2-Int.MAX_VALUE/2%imageViews.size

加上自动滑动用Handler

val handler:Handler=object:Handler(){
            override fun handleMessage(msg: Message) {
                super.handleMessage(msg)
                var item=myViewPager.currentItem+1
                myViewPager.setCurrentItem(item)

                sendEmptyMessageDelayed(0,4000)
            }
    }

handler.sendEmptyMessageDelayed(0,4000)