实现android广告栏效果

android对于广告栏的要求：

无限轮播
自动加手动滑动
简单的自定义指示器样式及位置
支持本地图片及网络图片
滑动流畅，无卡顿，无闪烁
广告页面不限制个数
页面点击监听事件
简单易用，高配置，无明显bug

动画效果默认的就好

实现效果图：

前期准备工作：

1.添加类库，在build.gradle中添加对Glide （图片加载框架）的引用：

compile 'com.ydevelop:bannerlayout:1.0.4'

2.AndroidManifest.xml中开网络权限，因为需要获取网络的图片

<uses-permission android:name="android.permission.INTERNET"/>

（1）在values目录下新建一个attr.xml文件：

<?xml version="1.0" encoding="utf-8"?>
<resources><attr name="visible_tab_count" format="integer"/><declare-styleable name="BannerLayoutStyle"><attr name="selectedIndicatorColor" format="color|reference"/><attr name="unSelectedIndicatorColor" format="color|reference"/><attr name="titleBGColor" format="color|reference"/><attr name="titleColor" format="color|reference"/><attr name="indicatorShape" format="enum"><enum name="rect" value="0"/><enum name="oval" value="1"/></attr><attr name="selectedIndicatorHeight" format="dimension|reference"/><attr name="selectedIndicatorWidth" format="dimension|reference"/><attr name="unSelectedIndicatorHeight" format="dimension|reference"/><attr name="unSelectedIndicatorWidth" format="dimension|reference"/><attr name="indicatorSpace" format="dimension|reference"/><attr name="indicatorMargin" format="dimension|reference"/><attr name="autoPlayDuration" format="integer|reference"/><attr name="scrollDuration" format="integer|reference"/><attr name="isAutoPlay" format="boolean"/><attr name="defaultImage" format="integer|reference"/></declare-styleable>
</resources>

（2）自定义一个类BannerLayout，实现轮播图效果：注意类的包名，见后面

（3）新建一个xml，引用自定义的类

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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"
    android:orientation="vertical" ><com.example.administrator.testb.BannerLayout
        android:id="@+id/banner2"
        android:layout_width="match_parent"
        android:layout_height="210dp"
        app:defaultImage="@mipmap/ic_launcher"
        app:scrollDuration="1000"
        app:autoPlayDuration="3000"
        app:unSelectedIndicatorHeight="10dp"
        app:unSelectedIndicatorWidth="10dp"
        app:selectedIndicatorHeight="10dp"
        app:selectedIndicatorWidth="10dp"
        app:unSelectedIndicatorColor="#99ffffff"
        app:selectedIndicatorColor="#000000"
        app:isAutoPlay="true"
        /></LinearLayout>

（4）在MainActivity中调用类的方法

 //参考网址：https://blog.csdn.net/zhaihaohao1/article/details/70746036
 BannerLayout bannerLayout2 = (BannerLayout) findViewById(R.id.banner2);List<String> urls = new ArrayList<>();urls.add("图片1地址url");urls.add("图片2地址url");
 urls.add("图片3地址url");
 urls.add("图片4地址url");
List<String> titleas = new ArrayList<>();titleas.add("标题一");titleas.add("标题二");titleas.add("标题三");titleas.add("标题四");if (bannerLayout2 != null) {bannerLayout2.setViewUrls(MainActivity.this ,urls, titleas);bannerLayout2.setOnBannerItemClickListener(new BannerLayout.OnBannerItemClickListener() {@Override
         public void onItemClick(int position) {Toast.makeText(MainActivity.this, "position:" + position, Toast.LENGTH_SHORT).show();}});}

（5）总结

这个例子很好的实现了我们需要的效果，大家在使用的过程中切记自定义的类需要引用对应的包名，修改小圆点位置是在BannerLayout文件里面，有对应的属性，可以设置居中或者居右，每一个图片都有相对应的点击事件，非常符合我们的需求，MainActivity调用的方法可以点击进去看看，还有一个方法可以显示本地的图片。

（6）自定义的类BannerLayout：

public class BannerLayout extends RelativeLayout {private ViewPager mViewPager; // 轮播容器

    // 指示器（圆点）容器
    private LinearLayout indicatorContainer;private Drawable unSelectedDrawable;private Drawable selectedDrawable;private int WHAT_AUTO_PLAY = 1000;private boolean isAutoPlay = true; // 自动轮播

    private int itemCount;private int selectedIndicatorColor = 0xffff0000;private int unSelectedIndicatorColor = 0x88888888;private int titleBGColor = 0X33000000;private int titleColor = 0Xffffffff;private Shape indicatorShape = Shape.oval;private int selectedIndicatorHeight = 20;private int selectedIndecatorWidth = 20;private int unSelectedIndicatorHeight = 20;private int unSelectedIndecatorWidth = 20;private int autoPlayDuration = 4000;private int scrollDuration = 900;//  指示器中点和点之间的距离
    private int indicatorSpace = 15;//  指示器整体的设置
    private int indicatorMargin = 20;private static final int titlePadding = 20;private int defaultImage;private enum Shape {// 矩形 或 圆形的指示器
        rect, oval
    }private OnBannerItemClickListener mOnBannerItemClickListener;private Handler mHandler = new Handler(new Handler.Callback() {@Override
        public boolean handleMessage(Message msg) {if (msg.what == WHAT_AUTO_PLAY) {if (mViewPager != null) {mViewPager.setCurrentItem(mViewPager.getCurrentItem() + 1, true);mHandler.sendEmptyMessageDelayed(WHAT_AUTO_PLAY, autoPlayDuration);}}return false;}});public BannerLayout(Context context) {super(context);init(null, 0);}public BannerLayout(Context context, AttributeSet attrs) {super(context, attrs);init(attrs, 0);}public BannerLayout(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init(attrs, defStyleAttr);}private void init(AttributeSet attrs, int defStyleAttr) {TypedArray array = getContext().obtainStyledAttributes(attrs, R.styleable.BannerLayoutStyle, defStyleAttr, 0);selectedIndicatorColor = array.getColor(R.styleable.BannerLayoutStyle_selectedIndicatorColor, selectedIndicatorColor);unSelectedIndicatorColor = array.getColor(R.styleable.BannerLayoutStyle_unSelectedIndicatorColor, unSelectedIndicatorColor);titleBGColor = array.getColor(R.styleable.BannerLayoutStyle_titleBGColor, titleBGColor);titleColor = array.getColor(R.styleable.BannerLayoutStyle_titleColor, titleColor);int shape = array.getInt(R.styleable.BannerLayoutStyle_indicatorShape, Shape.oval.ordinal());for (Shape shape1 : Shape.values()) {if (shape1.ordinal() == shape) {indicatorShape = shape1;break;}}selectedIndecatorWidth = (int) array.getDimension(R.styleable.BannerLayoutStyle_selectedIndicatorWidth, selectedIndecatorWidth);selectedIndicatorHeight = (int) array.getDimension(R.styleable.BannerLayoutStyle_selectedIndicatorHeight, selectedIndicatorHeight);unSelectedIndecatorWidth = (int) array.getDimension(R.styleable.BannerLayoutStyle_unSelectedIndicatorWidth, unSelectedIndecatorWidth);unSelectedIndicatorHeight = (int) array.getDimension(R.styleable.BannerLayoutStyle_unSelectedIndicatorHeight, unSelectedIndicatorHeight);indicatorSpace = (int) array.getDimension(R.styleable.BannerLayoutStyle_indicatorSpace, indicatorSpace);indicatorMargin = (int) array.getDimension(R.styleable.BannerLayoutStyle_indicatorMargin, indicatorMargin);autoPlayDuration = array.getInt(R.styleable.BannerLayoutStyle_autoPlayDuration, autoPlayDuration);scrollDuration = array.getInt(R.styleable.BannerLayoutStyle_scrollDuration, scrollDuration);isAutoPlay = array.getBoolean(R.styleable.BannerLayoutStyle_isAutoPlay, isAutoPlay);defaultImage = array.getResourceId(R.styleable.BannerLayoutStyle_defaultImage, defaultImage);array.recycle();LayerDrawable unSelectedLayerDrawable;LayerDrawable selectedLayerDrawable;GradientDrawable unSelectedGradientDrawable = new GradientDrawable();GradientDrawable selectedGradientDtawbale = new GradientDrawable();switch (indicatorShape) {case rect:unSelectedGradientDrawable.setShape(GradientDrawable.RECTANGLE);selectedGradientDtawbale.setShape(GradientDrawable.RECTANGLE);break;case oval:unSelectedGradientDrawable.setShape(GradientDrawable.OVAL);selectedGradientDtawbale.setShape(GradientDrawable.OVAL);break;}unSelectedGradientDrawable.setColor(unSelectedIndicatorColor);unSelectedGradientDrawable.setSize(unSelectedIndecatorWidth, unSelectedIndicatorHeight);unSelectedLayerDrawable = new LayerDrawable(new Drawable[]{unSelectedGradientDrawable});unSelectedDrawable = unSelectedLayerDrawable;selectedGradientDtawbale.setColor(selectedIndicatorColor);selectedGradientDtawbale.setSize(selectedIndecatorWidth, selectedIndicatorHeight);selectedLayerDrawable = new LayerDrawable(new Drawable[]{selectedGradientDtawbale});selectedDrawable = selectedLayerDrawable;}/**
     * 添加本地图片
     *
     * @param viewRes 图片id集合
     * @param titles  标题集合，可空
     */
    public void setViewRes(List<Integer> viewRes, List<String> titles) {List<View> views = new ArrayList<>();itemCount = viewRes.size();if (titles != null && titles.size() != viewRes.size()) {throw new IllegalStateException("views.size() != titles.size()");}// 把数量拼凑到三个以上
        if (itemCount < 1) {throw new IllegalStateException("item count not equal zero");} else if (itemCount < 2) {views.add(getFrameLayoutView(viewRes.get(0), titles != null ? titles.get(0) : null, 0));views.add(getFrameLayoutView(viewRes.get(0), titles != null ? titles.get(0) : null, 0));views.add(getFrameLayoutView(viewRes.get(0), titles != null ? titles.get(0) : null, 0));} else if (itemCount < 3) {views.add(getFrameLayoutView(viewRes.get(0), titles != null ? titles.get(0) : null, 0));views.add(getFrameLayoutView(viewRes.get(1), titles != null ? titles.get(1) : null, 1));views.add(getFrameLayoutView(viewRes.get(0), titles != null ? titles.get(0) : null, 0));views.add(getFrameLayoutView(viewRes.get(1), titles != null ? titles.get(1) : null, 1));} else {for (int i = 0; i < viewRes.size(); i++) {views.add(getFrameLayoutView(viewRes.get(i), titles != null ? titles.get(i) : null, i));}}setViews(views);}//添加网络图片路径
    public void setViewUrls(Context context,List<String> urls, List<String> titles) {List<View> views = new ArrayList<>();itemCount = urls.size();Log.e("TAG",titles.size()+"---90---"+urls.size());if (titles != null && titles.size() != itemCount) {throw new IllegalStateException("views.size() != titles.size()");}//主要是解决当item为小于3个的时候滑动有问题，这里将其拼凑成3个以上
        if (itemCount < 1) {//当item个数0
            throw new IllegalStateException("item count not equal zero");} else if (itemCount < 2) { //当item个数为1
            views.add(getFrameLayoutView(context,urls.get(0), titles != null ? titles.get(0) : null, 0));views.add(getFrameLayoutView(context,urls.get(0), titles != null ? titles.get(0) : null, 0));views.add(getFrameLayoutView(context,urls.get(0), titles != null ? titles.get(0) : null, 0));} else if (itemCount < 3) {//当item个数为2
            views.add(getFrameLayoutView(context,urls.get(0), titles != null ? titles.get(0) : null, 0));views.add(getFrameLayoutView(context,urls.get(1), titles != null ? titles.get(1) : null, 1));views.add(getFrameLayoutView(context,urls.get(0), titles != null ? titles.get(0) : null, 0));views.add(getFrameLayoutView(context,urls.get(1), titles != null ? titles.get(1) : null, 1));} else {for (int i = 0; i < urls.size(); i++) {views.add(getFrameLayoutView(context,urls.get(i), titles != null ? titles.get(i) : null, i));}}setViews(views);}private void setViews(final List<View> views) {mViewPager = new ViewPager(getContext());addView(mViewPager);setSliderTransformDuration(scrollDuration);//初始化indicatorContainer
        indicatorContainer = new LinearLayout(getContext());indicatorContainer.setGravity(Gravity.CENTER_VERTICAL);LayoutParams params = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);// 设置 指示点的位置  ALIGN_PARENT_RIGHT表示居右 CENTER_HORIZONTAL表示居中
        params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);//设置margin
        params.setMargins(indicatorMargin, indicatorMargin, indicatorMargin, indicatorMargin);//添加指示器容器布局到SliderLayout
        addView(indicatorContainer, params);//初始化指示器，并添加到指示器容器布局
        for (int i = 0; i < itemCount; i++) {ImageView indicator = new ImageView(getContext());indicator.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));indicator.setPadding(indicatorSpace, indicatorSpace, indicatorSpace, indicatorSpace);indicator.setImageDrawable(unSelectedDrawable);indicatorContainer.addView(indicator);}LoopPagerAdapter pagerAdapter = new LoopPagerAdapter(views);mViewPager.setAdapter(pagerAdapter);//设置当前item到Integer.MAX_VALUE中间的一个值，看起来像无论是往前滑还是往后滑都是ok的
        //如果不设置，用户往左边滑动的时候已经划不动了
        int targetItemPosition = Integer.MAX_VALUE / 2 - Integer.MAX_VALUE / 2 % itemCount;mViewPager.setCurrentItem(targetItemPosition);switchIndicator(targetItemPosition % itemCount);mViewPager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {@Override
            public void onPageSelected(int position) {switchIndicator(position % itemCount);}});startAutoPlay();}/**
     * 开始自动轮播
     */
    public void startAutoPlay() {stopAutoPlay(); // 避免重复消息
        if (isAutoPlay) {mHandler.sendEmptyMessageDelayed(WHAT_AUTO_PLAY, autoPlayDuration);}}@Override
    protected void onWindowVisibilityChanged(int visibility) {super.onWindowVisibilityChanged(visibility);if (visibility == VISIBLE) {startAutoPlay();} else {stopAutoPlay();}}/**
     * 停止自动轮播
     */
    public void stopAutoPlay() {if (isAutoPlay) {mHandler.removeMessages(WHAT_AUTO_PLAY);}}private void setSliderTransformDuration(int scrollDuration) {try {Field mScroller = ViewPager.class.getDeclaredField("mScroller");mScroller.setAccessible(true);FixedSpeedScroller fixedSpeedScroller = new FixedSpeedScroller(mViewPager.getContext(), null, scrollDuration);mScroller.set(mViewPager, fixedSpeedScroller);} catch (Exception e) {e.printStackTrace();}}@Override
    public boolean dispatchTouchEvent(MotionEvent ev) {switch (ev.getAction()) {case MotionEvent.ACTION_DOWN:stopAutoPlay();break;case MotionEvent.ACTION_CANCEL:case MotionEvent.ACTION_UP:startAutoPlay();break;}return super.dispatchTouchEvent(ev);}/**
     * 切换指示器状态
     *
     * @param currentPosition 当前位置
     */
    private void switchIndicator(int currentPosition) {for (int i = 0; i < indicatorContainer.getChildCount(); i++) {((ImageView) indicatorContainer.getChildAt(i)).setImageDrawable(i == currentPosition ? selectedDrawable : unSelectedDrawable);}}public void setOnBannerItemClickListener(OnBannerItemClickListener onBannerItemClickListener) {this.mOnBannerItemClickListener = onBannerItemClickListener;}@NonNull
    private FrameLayout getFrameLayoutView(Context context, String url, String title, final int position) {FrameLayout frameLayout = new FrameLayout(getContext());FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);layoutParams.gravity = Gravity.CENTER;ImageView imageView = new ImageView(getContext());frameLayout.addView(imageView);frameLayout.setOnClickListener(new OnClickListener() {@Override
            public void onClick(View v) {if (mOnBannerItemClickListener != null) {mOnBannerItemClickListener.onItemClick(position);}}});imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);if (defaultImage != 0){Glide.with(getContext()).load(url).placeholder(defaultImage).centerCrop().into(imageView);}else {Glide.with(getContext()).load(url).centerCrop().into(imageView);}if (!TextUtils.isEmpty(title)) {TextView textView = new TextView(getContext());textView.setText(title);textView.setTextColor(titleColor);textView.setPadding(titlePadding, titlePadding, titlePadding, titlePadding);textView.setBackgroundColor(titleBGColor);textView.getPaint().setFakeBoldText(true);layoutParams.gravity = Gravity.BOTTOM;frameLayout.addView(textView, layoutParams);}return frameLayout;}@NonNull
    private FrameLayout getFrameLayoutView(Integer res, String title, final int position) {FrameLayout frameLayout = new FrameLayout(getContext());FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);layoutParams.gravity = Gravity.CENTER;ImageView imageView = new ImageView(getContext());frameLayout.addView(imageView);frameLayout.setOnClickListener(new OnClickListener() {@Override
            public void onClick(View v) {if (mOnBannerItemClickListener != null) {mOnBannerItemClickListener.onItemClick(position);}}});imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);Glide.with(getContext()).load(res).centerCrop().into(imageView);if (!TextUtils.isEmpty(title)) {TextView textView = new TextView(getContext());textView.setText(title);textView.setTextColor(titleColor);textView.setPadding(titlePadding, titlePadding, titlePadding, titlePadding);textView.setBackgroundColor(titleBGColor);textView.getPaint().setFakeBoldText(true);layoutParams.gravity = Gravity.BOTTOM;frameLayout.addView(textView, layoutParams);}return frameLayout;}public interface OnBannerItemClickListener {void onItemClick(int position);}public class LoopPagerAdapter extends PagerAdapter {private List<View> views;public LoopPagerAdapter(List<View> views) {this.views = views;}@Override
        public int getCount() {//Integer.MAX_VALUE = 2147483647
            return Integer.MAX_VALUE;}@Override
        public boolean isViewFromObject(View view, Object object) {return view == object;}@Override
        public Object instantiateItem(ViewGroup container, int position) {if (views.size() > 0) {//position % view.size()是指虚拟的position会在[0，view.size()）之间循环
                View view = views.get(position % views.size());if (container.equals(view.getParent())) {container.removeView(view);}container.addView(view);return view;}return null;}@Override
        public void destroyItem(ViewGroup container, int position, Object object) {}}public class FixedSpeedScroller extends Scroller {private int mDuration = 1000;public FixedSpeedScroller(Context context) {super(context);}public FixedSpeedScroller(Context context, Interpolator interpolator) {super(context, (android.view.animation.Interpolator) interpolator);}public FixedSpeedScroller(Context context, Interpolator interpolator, int duration) {this(context, interpolator);mDuration = duration;}@Override
        public void startScroll(int startX, int startY, int dx, int dy, int duration) {// Ignore received duration, use fixed one instead
            super.startScroll(startX, startY, dx, dy, mDuration);}@Override
        public void startScroll(int startX, int startY, int dx, int dy) {// Ignore received duration, use fixed one instead
            super.startScroll(startX, startY, dx, dy, mDuration);}}}

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