Android Banner图片轮播效果 Android自动播放Banner图片轮播效果
a940659387 人气:0想了解Android自动播放Banner图片轮播效果的相关内容吗,a940659387在本文为您仔细讲解Android Banner图片轮播效果 的相关知识和一些Code实例,欢迎阅读和指正,我们先划重点:Android,Banner,图片轮播,下面大家一起来学习吧。
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。
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