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;
 }
}