本文实例为大家分享了Android自动播放Banner图片轮播的具体代码，供大家参考，具体内容如下

先看一下效果图

支持本地图片以及网络图片or本地网络混合。

使用方式：

<com.jalen.autobanner.BannerView android:id="@+id/banner" android:layout_width="match_parent" android:layout_height="230dip"></com.jalen.autobanner.BannerView>

核心代码：

int length = mList.size(); View view = LayoutInflater.from(mContext).inflate(R.layout.banner_view,this,true); LinearLayout ll = (LinearLayout) view.findViewById(R.id.ll_points); vp= (ViewPager) view.findViewById(R.id.vp); ll.removeAllViews(); LinearLayout.LayoutParams ll_parmas = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT); ll_parmas.leftMargin=5; ll_parmas.rightMargin=5; for(int i=0;i<length;i++){ ImageView img = new ImageView(mContext); img.setLayoutParams(ll_parmas); if(i==0){ img.setImageResource(R.mipmap.dot_focus); }else{ img.setImageResource(R.mipmap.dot_blur); } ll.addView(img); mImgs.add(img); final ImageView imgforview = new ImageView(mContext); imgforview.setOnClickListener(this); imgforview.setScaleType(ImageView.ScaleType.FIT_XY); if(mList.get(i).getType()==0){//本地图片 imgforview.setImageResource(mList.get(i).getDrawableforint()); }else{//网络 Glide.with(mContext).load(mList.get(i).getDrawableforurl()).diskCacheStrategy(DiskCacheStrategy.ALL).into(imgforview);// Glide.with(mContext).load(mList.get(i).getDrawableforurl()).listener(new RequestListener<String, GlideDrawable>() {// @Override// public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource) {// Log.d("yu","Faile:"+e.toString());// return false;// }//// @Override// public boolean onResourceReady(GlideDrawable resource, String model, Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {// imgforview.setImageDrawable(resource);// return false;// }// }).into(imgforview);// Log.d("yu","url: "+mList.get(i).getDrawableforurl()); } mViews.add(imgforview); } vp.setAdapter(new MyAdapter()); vp.addOnPageChangeListener(onPageChange);

自动轮播利用的是handler的postdelay方法。

private Runnable task = new Runnable() { @Override public void run() { if(isAuto){ currentItem = currentItem%(mViews.size());// Log.d("yu","runalbe "+currentItem); if(currentItem==0){ vp.setCurrentItem(currentItem,false); }else{ vp.setCurrentItem(currentItem); } currentItem++; mHandle.postDelayed(task,delaytime); }else{ mHandle.postDelayed(task,delaytime); } } };

利用isAuto判断是否正在自动轮播 如果为false 不自动切换item。isAuto赋值操作位于OnPageChangeListener的onPageScrollStateChanged方法中：

public void onPageScrollStateChanged(int state) { switch (state){ case ViewPager.SCROLL_STATE_IDLE://用户什么都没有操作 isAuto=true; currentItem = vp.getCurrentItem();// Log.d("yu","IDLE"+currentItem);// if(vp.getCurrentItem()==mViews.size()){// vp.setCurrentItem(0,false);// } break; case ViewPager.SCROLL_STATE_DRAGGING://正在滑动 isAuto =false; break; case ViewPager.SCROLL_STATE_SETTLING://滑动结束 isAuto=true; break; } }

当状态为SCROLL_STATE_DRAGGING时 说明用户正在操作 ，看下源码中的解释：

/** * Indicates that the pager is in an idle, settled state. The current page * is fully in view and no animation is in progress. */ public static final int SCROLL_STATE_IDLE = 0; /** * Indicates that the pager is currently being dragged by the user. */ public static final int SCROLL_STATE_DRAGGING = 1; /** * Indicates that the pager is in the process of settling to a final position. */ public static final int SCROLL_STATE_SETTLING = 2;

大致意思呢就是 0代码没有任何操作。1页面正在被用户拖动。2代表成功切换至下一页面。

源码地址：https://github.com/yudehai0204/autoBanner

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。