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Android自动播放Banner图片轮播效果

2019-12-12 06:05:12
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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武林网。

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