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：

android:id="@+id/banner"

android:layout_width="match_parent"

android:layout_height="230dip">

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

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() {

// @Override

// public boolean onException(Exception e, String model, Target target, boolean isFirstResource) {

// Log.d("yu","Faile:"+e.toString());

// return false;

// }

//

// @Override

// public boolean onResourceReady(GlideDrawable resource, String model, Target 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。

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脚本之家。