Android开发实现图片切换APP

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.constraintlayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".mainactivity">

 <imageswitcher
 android:id="@+id/is_1"
 android:layout_width="match_parent"
 android:layout_height="243dp"
 android:layout_margintop="68dp"
 app:layout_constraintend_toendof="parent"
 app:layout_constrainthorizontal_bias="0.0"
 app:layout_constraintstart_tostartof="parent"
 app:layout_constrainttop_totopof="parent" />

 <linearlayout
 android:id="@+id/linearlayout"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_margintop="68dp"
 android:orientation="horizontal"
 android:paddingtop="15dp"
 app:layout_constraintend_toendof="parent"
 app:layout_constraintstart_tostartof="parent"
 app:layout_constrainttop_tobottomof="@+id/is_1">

 <button
  android:id="@+id/btn_previous"
  style="?android:attr/borderlessbuttonstyle"
  android:layout_width="0dip"
  android:layout_height="wrap_content"
  android:layout_marginleft="15dp"
  android:layout_marginright="15dp"
  android:layout_weight="1"
  android:background="@drawable/shape_button_main"
  android:text="下一张"
  android:textcolor="#ffffff"
  android:textsize="18dp" />

 <button
  android:id="@+id/btn_next"
  style="?android:attr/borderlessbuttonstyle"
  android:layout_width="0dip"
  android:layout_height="wrap_content"
  android:layout_marginleft="15dp"
  android:layout_marginright="15dp"
  android:layout_weight="1"
  android:background="@drawable/shape_button_main"
  android:text="上一张"
  android:textcolor="#ffffff"
  android:textsize="18dp" />
 </linearlayout>

 <button
 android:id="@+id/btn_3"
 android:layout_width="176dp"
 android:layout_height="80dp"
 android:layout_margintop="8dp"
 android:layout_marginbottom="16dp"
 android:background="@drawable/shape_button_main"
 android:text="另外一种效果"
 android:textsize="20dp"
 app:layout_constraintbottom_tobottomof="parent"
 app:layout_constraintend_toendof="parent"
 app:layout_constraintstart_tostartof="parent"
 app:layout_constrainttop_tobottomof="@+id/linearlayout" />

</android.support.constraint.constraintlayout>

package com.example.wuluo.yanqi;

import android.content.intent;
import android.support.v7.app.appcompatactivity;
import android.os.bundle;
import android.view.view;
import android.widget.button;
import android.widget.imageswitcher;
import android.widget.imageview;
import android.widget.viewswitcher;

public class mainactivity extends appcompatactivity implements view.onclicklistener,viewswitcher.viewfactory{

 private imageswitcher is_1;
 private button btn_next;
 private button btn_previous;
 private button btn_3;
 private int image[]={r.drawable.tian1,r.drawable.tian2,r.drawable.tian3,r.drawable.tian4};//图片的id数组
 private int imageindex=0;//图片显示序列号

 @override
 protected void oncreate(bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 setcontentview(r.layout.activity_main);
 is_1=(imageswitcher) findviewbyid(r.id.is_1);
 btn_next=(button) findviewbyid(r.id.btn_next);
 btn_previous=(button) findviewbyid(r.id.btn_previous);
 btn_3=(button)findviewbyid(r.id.btn_3);

 btn_previous.setonclicklistener(this);
 btn_next.setonclicklistener(this);
 btn_3.setonclicklistener(this);
 init(); //设置factory
 }
 @override
 public void onclick(view view) {
 if (view.getid()==r.id.btn_next){
  imageindex++;
  if(imageindex>3){
  imageindex=0;
  }
  is_1.setinanimation(this,r.anim.left_in);
  is_1.setoutanimation(this,r.anim.right_out);
 }else if(view.getid()==r.id.btn_previous){
  imageindex--;
  if(imageindex<0){
  imageindex=image.length-1;
  }
  is_1.setinanimation(this,r.anim.right_in);
  is_1.setoutanimation(this,r.anim.left_out);
 }else if(view.getid()==r.id.btn_3){
  intent intent=new intent();
  intent.setclass(this,other2.class);
  startactivity(intent);

 }
 is_1.setimageresource(image[imageindex]);
 }

 @override
 public view makeview() {//实现viewfactory接口.生成imageview
 imageview imageview=new imageview(this);
 return imageview;
 }
 private void init(){//初始化imageswitch
 is_1.setfactory(this);
 is_1.setimageresource(image[imageindex]);
 }

}

package com.example.wuluo.yanqi;


/**
 * created by wuluo on 2018/12/21
 */
import android.support.v4.view.pageradapter;
import android.support.v4.view.viewpager;
import android.view.view;
import java.util.arraylist;

public class viewpageradapter extends pageradapter {
 //界面列表
 private arraylist<view> views;
 public viewpageradapter(arraylist<view> views) {
 this.views = views;
 }
 /**
 * 获得当前界面数
 */
 @override
 public int getcount() {
 if (views != null) {
  return views.size();
 }
 return 0;
 }
 /**
 * 初始化position位置的界面
 */
 @override
 public object instantiateitem(view view, int position) {

 ((viewpager) view).addview(views.get(position), 0);

 return views.get(position);
 }
 /**
 * 判断是否由对象生成界面
 */
 @override
 public boolean isviewfromobject(view view, object arg1) {
 return (view == arg1);
 }
 /**
 * 销毁position位置的界面
 */
 @override
 public void destroyitem(view view, int position, object arg2) {
 ((viewpager) view).removeview(views.get(position));
 }
}

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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=".other2">

 <android.support.v4.view.viewpager
 android:id="@+id/viewpager"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 app:layout_constraintbottom_tobottomof="parent"
 app:layout_constraintend_toendof="parent"
 app:layout_constrainthorizontal_bias="0.0"
 app:layout_constraintstart_tostartof="parent"
 app:layout_constrainttop_totopof="parent"
 app:layout_constraintvertical_bias="0.0" />

 <linearlayout
 android:id="@+id/ll"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_alignparentbottom="true"
 android:layout_centerhorizontal="true"
 android:layout_marginstart="8dp"
 android:layout_marginend="8dp"
 android:layout_marginbottom="8dp"
 android:orientation="horizontal"
 app:layout_constraintbottom_tobottomof="@+id/viewpager"
 app:layout_constraintend_toendof="parent"
 app:layout_constraintstart_tostartof="parent">

 <imageview
  android:layout_width="wrap_content"
  android:layout_height="40dp"
  android:layout_gravity="center_vertical"
  android:clickable="true"
  android:padding="15.0dip"
  android:src="@drawable/point" />

 <imageview
  android:layout_width="wrap_content"
  android:layout_height="40dp"
  android:layout_gravity="center_vertical"
  android:clickable="true"
  android:padding="15.0dip"
  android:src="@drawable/point" />

 <imageview
  android:layout_width="wrap_content"
  android:layout_height="40dp"
  android:layout_gravity="center_vertical"
  android:clickable="true"
  android:padding="15.0dip"
  android:src="@drawable/point" />

 <imageview
  android:layout_width="wrap_content"
  android:layout_height="40dp"
  android:layout_gravity="center_vertical"
  android:clickable="true"
  android:padding="15.0dip"
  android:src="@drawable/point" />
 </linearlayout>
</android.support.constraint.constraintlayout>

package com.example.wuluo.yanqi;

import android.support.v4.view.viewpager;
import android.support.v7.app.actionbar;
import android.support.v7.app.appcompatactivity;
import android.os.bundle;
import android.view.view;
import android.widget.imageview;
import android.widget.linearlayout;

import java.util.arraylist;

public class other2 extends appcompatactivity implements view.onclicklistener,viewpager.onpagechangelistener{
 private viewpager viewpager;//定义viewpager对象
 private viewpageradapter vpadapter;//定义viewpager适配器
 private arraylist<view> views;//定义一个arraylist来存放view
 private static final int[] pics = {r.drawable.one,r.drawable.two,r.drawable.san,r.drawable.si};//引导图片资源
 private imageview[] points;//底部小点的图片
 private int currentindex;
 @override
 protected void oncreate(bundle savedinstancestate) {
 actionbar actionbar=getsupportactionbar();//
 actionbar.hide();//隐藏标题栏
 super.oncreate(savedinstancestate);
 setcontentview(r.layout.activity_other2);
 initview();
 initdata();
 }

 private void initdata() {
 linearlayout.layoutparams mparams = new linearlayout.layoutparams(linearlayout.layoutparams.fill_parent,
  linearlayout.layoutparams.fill_parent);
 //初始化引导图片列表
 for(int i=0; i<pics.length; i++) {
  imageview iv = new imageview(this);
  iv.setlayoutparams(mparams);
  iv.setimageresource(pics[i]);
  views.add(iv);
 }
 viewpager.setadapter(vpadapter); //设置数据
 viewpager.setonpagechangelistener(this);//设置监听
 initpoint();//初始化底部小点
 }

 private void initpoint() {
 linearlayout linearlayout = (linearlayout) findviewbyid(r.id.ll);
 points = new imageview[pics.length];
 //循环取得小点图片
 for (int i = 0; i < pics.length; i++) {
  points[i] = (imageview) linearlayout.getchildat(i);//得到一个linearlayout下面的每一个子元素
  points[i].setenabled(true);//默认都设为灰色
  points[i].setonclicklistener(this);//给每个小点设置监听
  points[i].settag(i);//设置位置tag，方便取出与当前位置对应
 }
 currentindex = 0;//设置当面默认的位置
 points[currentindex].setenabled(false);//设置为白色，即选中状态
 }

 private void initview() {
 views = new arraylist<view>();//实例化arraylist对象
 viewpager = (viewpager) findviewbyid(r.id.viewpager);//实例化viewpager
 vpadapter = new viewpageradapter(views);//实例化viewpager适配器
 }
 @override
 public void onpagescrolled(int i, float v, int i1) {

 }

 @override
 public void onpageselected(int i) {
 setcurdot(i);
 }

 @override
 public void onpagescrollstatechanged(int i) {

 }

 @override
 public void onclick(view view) {
 int position = (integer)view.gettag();
 setcurview(position);
 setcurdot(position);

 }

 private void setcurview(int position){
 if (position < 0 || position >= pics.length) {
  return;
 }
 viewpager.setcurrentitem(position);
 }
 private void setcurdot(int positon){
 if (positon < 0 || positon > pics.length - 1 || currentindex == positon) {
  return;
 }
 points[positon].setenabled(false);
 points[currentindex].setenabled(true);
 currentindex = positon;
 }
}