1、准备底部圆点的素材、利用Drawable的功能，去实现一个圆点图片的展示

drawable下新建两个Drawable resource file：dot_normal.xml和dot_select.xml

dot_normal.xml<?xml version="1.0" encoding="utf-8"?>

android:shape="oval">

android:width="10dp"

android:height="10dp" />

dot_select.xml<?xml version="1.0" encoding="utf-8"?>

android:shape="oval">

android:width="10dp"

android:height="10dp" />

新建类ImageBannerFramLayout继承FrameLayout并Create constructor matching super(实现前面三个构造方法就行)

实现方法initImageBannerViewGroup()和initDotLinearlayout()并在三个构造方法中调用//构造方法

public ImageBannerFramLayout(@NonNull Context context) {

super(context);

initImageBannerViewGroup();

initDotLinearlayout();

}

public ImageBannerFramLayout(@NonNull Context context, @Nullable AttributeSet attrs){

super(context, attrs);

initImageBannerViewGroup();

initDotLinearlayout();

}

public ImageBannerFramLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

initImageBannerViewGroup();

initDotLinearlayout();

}

/**

* 初始化自定义的图片轮播核心类

*/

private void initImageBannerViewGroup() {

imageBannerViewGroup = new ImageBannerViewGroup(getContext());

//设置宽度和高度

FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT);

imageBannerViewGroup.setLayoutParams(lp);

imageBannerViewGroup.setDotChangeListener(this);//这里将Listener传递给Framlayout

imageBannerViewGroup.setImageBannerLister(this);

addView(imageBannerViewGroup);

}

/**

* 初始化底部圆点布局

*/

private void initDotLinearlayout() {

linearLayout = new LinearLayout(getContext());

FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, 40);

linearLayout.setLayoutParams(lp);

//水平并居中

linearLayout.setOrientation(LinearLayout.HORIZONTAL);

linearLayout.setGravity(Gravity.CENTER);

//设置背景颜色

// linearLayout.setBackgroundColor(Color.RED);

addView(linearLayout);

//将圆点放到底部

FrameLayout.LayoutParams layoutParams = (LayoutParams) linearLayout.getLayoutParams();

layoutParams.gravity = Gravity.BOTTOM;

linearLayout.setLayoutParams(layoutParams);

//设置底部圆点透明度 3.0之后使用setAlpha()，3.0之前也是使用这个方法，但调用者不同

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {

linearLayout.setAlpha(0.5f);//传入float值

} else {

linearLayout.getBackground().setAlpha(100);//传入int值0~255

}

}

添加方法addDotToLinearlayout()和addBitmapToImageBannerViewGroup()并在addBitmaps()中调用public void addBitmaps(List list) {

for (int i = 0; i < list.size(); i++) {

Bitmap bitmap = list.get(i);

addBitmapToImageBannerViewGroup(bitmap);

addDotToLinearlayout();

}

}

private void addDotToLinearlayout() {

ImageView imageView = new ImageView(getContext());

LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);

//设置圆点的距离

lp.setMargins(5, 5, 5, 5);

imageView.setLayoutParams(lp);

imageView.setImageResource(R.drawable.dot_normal);

linearLayout.addView(imageView);

}

private void addBitmapToImageBannerViewGroup(Bitmap bitmap) {

ImageView imageView = new ImageView(getContext());

imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);

//设置宽度(设备的宽度存储在全局变量C.WIDTH中)和高度

imageView.setLayoutParams(new ViewGroup.LayoutParams(C.WIDTH, ViewGroup.LayoutParams.WRAP_CONTENT));

imageView.setImageBitmap(bitmap);

imageBannerViewGroup.addView(imageView);

}