package com.rrd.ucredit.viewpager
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.view.ViewGroup
import android.support.v4.view.PagerAdapter
import android.view.View
import android.widget.LinearLayout
import android.widget.TextView
import android.support.v4.view.ViewPager
import android.util.Log
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity(),View.OnClickListener {
var viewPagerView:ViewPager?=null
private var adapter:ViewAdapter?=null
var viewList=ArrayList()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
initViewList()
initViewPager()
initEvent()
}
fun initEvent(){
tv_add.setOnClickListener(this)
tv_del.setOnClickListener(this)
}
fun initViewPager(){
vp_test.offscreenPageLimit=3
adapter=ViewAdapter(viewList);
vp_test.adapter=adapter
}
fun initViewList(){
var x=0
viewList.clear()
//初始化4张图片
while(x<=3)
{
viewList.add(createView(x))
x++
}
}
fun createView(index:Int) :View{
var view1:LinearLayout= LinearLayout(this)
view1.orientation=LinearLayout.VERTICAL
if(index==0)
{
view1.setBackgroundColor(resources.getColor(R.color.color1))
}else if(index==1)
{
view1.setBackgroundColor(resources.getColor(R.color.color4))
}else if(index==2)
{
view1.setBackgroundColor(resources.getColor(R.color.color7))
}else if(index==3)
{
view1.setBackgroundColor(resources.getColor(R.color.color8))
}else if(index==4)
{
view1.setBackgroundColor(resources.getColor(R.color.color15))
}else{
view1.setBackgroundColor(resources.getColor(R.color.color17))
}
view1.layoutParams=LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT)
var textView:TextView=TextView(this)
textView.text="第"+index+"张图"
textView.setTextColor(resources.getColor(R.color.color6))
textView.textSize=13f
view1.addView(textView)
return view1
}
override fun onClick(p0: View?) {
when(p0?.id)
{
R.id.tv_add->{
viewList.add(createView(viewList.size))
adapter?.notifyDataSetChanged()
}
R.id.tv_del->{
var index :Int=if(viewList.size>0)viewList.size-1 else -1
if(index==-1)
{
Toast.makeText(this,"已经没有view只能添加了",Toast.LENGTH_LONG).show()
}else{
viewList.removeAt(index)
adapter?.notifyDataSetChanged()
}
}
}
}
internal inner class ViewAdapter(private val datas: List) : PagerAdapter() {
override fun getCount(): Int {
Log.e("MainActiviy","getCount"+datas.size)
return if (datas !=null)datas.size else 0
}
override fun isViewFromObject(view: View, item: Any): Boolean {
var isView:Boolean=view === item;
Log.e("MainActiviy","iisViewFromObject"+isView)
return isView
}
override fun instantiateItem(container: ViewGroup, position: Int): Any {
val view =datas[position]
container.addView(view)
Log.e("MainActiviy","instantiateItem位置"+position)
return view
}
//高能预警 解决删除item不能刷新问题
override fun destroyItem(container: ViewGroup, position: Int, item: Any) {
container.removeView(itemas View?)
Log.e("MainActiviy","destroyItem位置"+position)
}
//高能预警 解决删除item不能刷新问题
override fun getItemPosition(itemView: Any?): Int {
if(datas.contains(itemView))
{
return datas.indexOf(itemView)
}else{
return POSITION_NONE
}
}
}
}
布局文件
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="com.rrd.ucredit.viewpager.MainActivity">
android:id="@+id/vp_test"
android:layout_width="match_parent"
android:layout_height="300dp">
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:orientation="horizontal">
android:id="@+id/tv_add"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@color/colorAccent"
android:gravity="center"
android:padding="20dp"
android:text="添加viewPage"
android:textColor="#ffffff"
android:textSize="14sp" />
android:id="@+id/tv_del"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_weight="1"
android:background="@color/colorAccent"
android:gravity="center"
android:padding="20dp"
android:text="删除viewpager"
android:textColor="#ffffff"
android:textSize="14sp" />
