如何使用banner ，每个用户对banner的需求都不同，如何在原有的基础上让用户自己定义相要的效果
1.在valuse 下创建 .xml 文件
2.在banner 类中根据构造方法的属性集来获取相应的属性
3.使用banner
在valuse 下创建 .xml 文件
创建的属性及默认值
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="Banner">
<!-- private int mIndicatorEndMargin;
* private int mScrollTime;//动画执行时间
* private int mScrollMode;//切换模式 垂直或水平方向
* private int mInterval=3000; // 切换间隔时间 (滑动管理器 点进去注释了)
* private int mMarginTitleStart;
* private int mTitleTextSize;
* private int mTitleTextColor;
* private int mTitleByViewHeight;
* private int mIndicatorRadio;
* private int mIndicatorSelectColor;
* private int mIndicatorUnSelectColor;
* private int mTitleMarginTop;
* private int mTitleMarginBottom;
* private int mShowTitleByView=true;
* private boolean isAutoLoop = true;
*/
-->
<attr name="bannerIndicatorEndMargin" format="dimension|reference"/>
<attr name="bannerPageSwitchInterval" format="integer"/>
<attr name="bannerPageScrollTime" format="integer"/>
<attr name="bannerMarginTitleStart" format="dimension|reference"/>
<attr name="bannerTitleTextSize" format="dimension|reference"/>
<attr name="bannerTitleMarginTop" format="dimension|reference"/>
<attr name="bannerTitleMarginBottom" format="dimension|reference"/>
<attr name="bannerTitleTextColor" format="color|reference"/>
<attr name="bannerTitleBgViewHeight" format="dimension|reference"/>
<attr name="bannerIndicatorMargin" format="dimension|reference"/>
<attr name="bannerIndicatorRadio" format="dimension|reference"/>
<attr name="bannerIndicatorSelectColor" format="color|reference"/>
<attr name="bannerIndicatorUnSelectColor" format="color|reference"/>
<attr name="bannerIsShowTitleByView" format="boolean"/>
<attr name="bannerIsAutoLoop" format="boolean"/>
<attr name="bannerTitleMarquee" format="boolean"/>
<attr name="bannerPageScrollMode">
<enum name="vertical" value="1"/>
<enum name="horizontal" value="0"/>
</attr>
</declare-styleable>
</resources>
在banner 类中根据构造方法的属性集来获取相应的属性
public class Banner extends ConstraintLayout {
private static final int DEFAULT_INTERVAL = 3000;//时间间隔
private static final int DEFAULT_TIME = 3000;//时间间隔
private static final int DEFAULT_MARGIN_DP=12;
private static final int DEFAULT_INDICATION_RADIO=3;
private static final int DEFAULT_TITLE_SIZE_DP=12;
private static final int SCROLL_MODE_VERTICAL=1;
private static final int SCROLL_MODE_HORIZONTAL=0;
private int mMarginTitleStart;
private int mTitleTextSize;
private int mTitleTextColor;
private int mTitleByViewHeight;
private int mIndicatorRadio;
private int mIndicatorSelectColor;
private int mIndicatorUnSelectColor;
private int mTitleMarginTop;
private int mTitleMarginBottom;
private int mIndicatorMargin;
private ViewPager2 viewPager2;
private TextView title;
private Indicator mIndicator;
private ArrayList<? extends IBannerData> mData;//适配器使用
private static int mIds=0x1000;//变量
private int mIndicatorEndMargin;//指示器端部边距
private int mInterval; // 切换间隔时间
private int mScrollTime ;// 轮播切换时间
private int mScrollMode;//切换模式 垂直或水平方向
private boolean mTitleMarquee;//设置跑马灯
private boolean mShowTitleByView=true;//是否显示title那个半透明背景
private boolean isAutoLoop = true; // 是否自动循环
public Banner(Context context) {
super(context);
}
public Banner(Context context, AttributeSet attrs) {
super(context, attrs);
initValue(attrs);
}
public Banner(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initValue(attrs);
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
initView();
}
private void initValue(AttributeSet attributeSet ){
TypedArray array=getContext().obtainStyledAttributes(attributeSet, R.styleable.Banner);
/**
* private int mIndicatorEndMargin;
* private int mScrollTime;//动画执行时间
* private int mScrollMode;//切换模式 垂直或水平方向
* private int mInterval=3000; // 切换间隔时间 (滑动管理器 点进去注释了)
* private int mMarginTitleStart;
* private int mTitleTextSize;
* private int mTitleTextColor;
* private int mTitleByViewHeight;
* private int mIndicatorRadio;
* private int mIndicatorSelectColor;
* private int mIndicatorUnSelectColor;
* private int mTitleMarginTop;
* private int mTitleMarginBottom;
* private int mShowTitleByView=true;
* private boolean isAutoLoop = true;
*/
mTitleMarginTop=array.getDimensionPixelSize(R.styleable.Banner_bannerTitleMarginTop,DEFAULT_MARGIN_DP);
mTitleMarginBottom=array.getDimensionPixelOffset(R.styleable.Banner_bannerTitleMarginBottom,DEFAULT_MARGIN_DP);
mShowTitleByView=array.getBoolean(R.styleable.Banner_bannerIsShowTitleByView,true);
isAutoLoop=array.getBoolean(R.styleable.Banner_bannerIsAutoLoop,true);
mIndicatorSelectColor=array.getColor(R.styleable.Banner_bannerIndicatorSelectColor,Color.GRAY);
mIndicatorUnSelectColor=array.getColor(R.styleable.Banner_bannerIndicatorUnSelectColor,Color.WHITE);
mIndicatorEndMargin=array.getDimensionPixelSize(R.styleable.Banner_bannerIndicatorEndMargin,dip2px(DEFAULT_MARGIN_DP));
mIndicatorMargin=array.getDimensionPixelSize(R.styleable.Banner_bannerIndicatorMargin,dip2px(DEFAULT_INDICATION_RADIO));
mInterval=array.getInt(R.styleable.Banner_bannerPageSwitchInterval,DEFAULT_INTERVAL);
mScrollTime=array.getInt(R.styleable.Banner_bannerPageScrollTime,DEFAULT_TIME);
mScrollMode = array.getInt(R.styleable.Banner_bannerPageScrollMode,SCROLL_MODE_HORIZONTAL);
mMarginTitleStart=array.getDimensionPixelSize(R.styleable.Banner_bannerTitleTextSize,DEFAULT_MARGIN_DP);
mTitleTextSize=array.getDimensionPixelSize(R.styleable.Banner_bannerTitleTextSize,dip2px(DEFAULT_TITLE_SIZE_DP));
mTitleTextColor=array.getColor(R.styleable.Banner_bannerTitleTextColor,Color.WHITE);
mIndicatorRadio=array.getDimensionPixelOffset(R.styleable.Banner_bannerIndicatorRadio,DEFAULT_INDICATION_RADIO);
mTitleMarquee=array.getBoolean(R.styleable.Banner_bannerTitleMarquee,true);
array.recycle();
mIndicatorEndMargin= dip2px(15);
mInterval=DEFAULT_INTERVAL;
mScrollTime=DEFAULT_TIME;
}
public ViewPager2 getViewPager2() {
return viewPager2;
}
public int getScrollTime() {
return mScrollTime;
}
private void initView() {
//添加一个viewPager2
viewPager2 = new ViewPager2(getContext());
//创建id
viewPager2.setId(mIds++);
//view Page2 监听
viewPager2.registerOnPageChangeCallback(new ViewPager2.OnPageChangeCallback() {
@Override
public void onPageSelected(int position) {
title.setText(mData.get(position % mData.size()).getTitle());
mIndicator.setCurrent(position % mData.size());
}
});
//添加
addView(viewPager2);
//创建约束集
ConstraintSet constraintSet = new ConstraintSet();
//克隆约束集
constraintSet.clone(this);
constraintSet.connect(viewPager2.getId(),ConstraintSet.START,ConstraintSet.PARENT_ID,ConstraintSet.START);
constraintSet.connect(viewPager2.getId(),ConstraintSet.END,ConstraintSet.PARENT_ID,ConstraintSet.END);
constraintSet.connect(viewPager2.getId(),ConstraintSet.BOTTOM,ConstraintSet.PARENT_ID,ConstraintSet.BOTTOM);
constraintSet.connect(viewPager2.getId(),ConstraintSet.TOP,ConstraintSet.PARENT_ID,ConstraintSet.TOP);
constraintSet.constrainWidth(viewPager2.getId(),ConstraintSet.MATCH_CONSTRAINT);
constraintSet.constrainHeight(viewPager2.getId(),ConstraintSet.MATCH_CONSTRAINT);
//添加一个title 半透明背景
ImageView background = new ImageView(getContext());
background.setBackgroundColor(Color.parseColor("#40000000"));
background.setId(mIds++);
addView(background);
constraintSet.connect(background.getId(),ConstraintSet.START,ConstraintSet.PARENT_ID,ConstraintSet.START);
constraintSet.connect(background.getId(),ConstraintSet.END,ConstraintSet.PARENT_ID,ConstraintSet.END);
constraintSet.connect(background.getId(),ConstraintSet.BOTTOM,ConstraintSet.PARENT_ID,ConstraintSet.BOTTOM);
constraintSet.constrainWidth(background.getId(),ConstraintSet.MATCH_CONSTRAINT);
TextView textView = new TextView(getContext());
textView.setTextSize(TypedValue.COMPLEX_UNIT_PX,mTitleTextSize);
textView.setSingleLine(true);
int meauseWidth = MeasureSpec.makeMeasureSpec(1080, MeasureSpec.AT_MOST);
int meauseHeight = MeasureSpec.makeMeasureSpec(1920, MeasureSpec.AT_MOST);
textView.measure(meauseWidth,meauseHeight);
int height = textView.getMeasuredHeight();
constraintSet.constrainHeight(background.getId(),height+mTitleMarginTop+mTitleMarginBottom);
if(!mShowTitleByView){
background.setVisibility(INVISIBLE);
}
//添加一个圆点容器
mIndicator=new CircleIndicator(getContext());
mIndicator.setRadio(mIndicatorRadio);
mIndicator.setMargin(mIndicatorMargin);
mIndicator.setSelectColor(mIndicatorSelectColor);
mIndicator.setUnSelectColor(mIndicatorUnSelectColor);
mIndicator.setId(mIds++);
addView((View) mIndicator);
constraintSet.connect(mIndicator.getId(),ConstraintSet.END,ConstraintSet.PARENT_ID,ConstraintSet.END,mIndicatorEndMargin);
constraintSet.connect(mIndicator.getId(),ConstraintSet.BOTTOM, background.getId(),ConstraintSet.BOTTOM);
constraintSet.connect(mIndicator.getId(),ConstraintSet.TOP, background.getId(),ConstraintSet.TOP);
constraintSet.constrainWidth(mIndicator.getId(),ConstraintSet.MATCH_CONSTRAINT);
constraintSet.constrainHeight(mIndicator.getId(),ConstraintSet.MATCH_CONSTRAINT);
//添加一个title
title = new TextView(getContext());
title.setId(mIds++);
title.setTextColor(mTitleTextColor);
title.setSingleLine(true);//单行跑起来
if (mTitleMarquee){
title.setEllipsize(TextUtils.TruncateAt.MARQUEE);
title.setSelected(true);
title.setMarqueeRepeatLimit(-1);//无线循环
}else {
title.setEllipsize(TextUtils.TruncateAt.END);//文字跑马灯
}
title.setTextSize(TypedValue.COMPLEX_UNIT_PX,mTitleTextSize);
title.setTextColor(mTitleTextColor);
addView(title);
constraintSet.connect(title.getId(),ConstraintSet.START,ConstraintSet.PARENT_ID,ConstraintSet.START);
constraintSet.connect(title.getId(),ConstraintSet.END,mIndicator.getId(),ConstraintSet.END,mIndicatorEndMargin);
constraintSet.connect(title.getId(),ConstraintSet.BOTTOM, background.getId(),ConstraintSet.BOTTOM);
constraintSet.connect(title.getId(),ConstraintSet.TOP, background.getId(),ConstraintSet.TOP);
constraintSet.constrainWidth(title.getId(),ConstraintSet.MATCH_CONSTRAINT);
constraintSet.constrainHeight(title.getId(),ConstraintSet.MATCH_CONSTRAINT);
/* int widthMode=MeasureSpec.getMode(meauseWidth);
int width=MeasureSpec.getSize(meauseWidth);*/
constraintSet.applyTo(this);
}
//触摸停止 dispatchTouchEvent
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
switch (ev.getAction()){
case MotionEvent.ACTION_DOWN:{
stopLoop();
break;
}
case MotionEvent.ACTION_UP:{
startLoop();
}
}
return super.dispatchTouchEvent(ev);
}
public void setData(BannerAdapter adapter){
mData = adapter.getData();
if (mData==null||mData.size()==0){
return;
}
viewPager2.setAdapter(adapter);
viewPager2.setUserInputEnabled(true);//允许用户触摸
if (mScrollMode ==SCROLL_MODE_HORIZONTAL){
viewPager2.setOrientation(ViewPager2.ORIENTATION_HORIZONTAL);//横向
}else {
viewPager2.setOrientation(ViewPager2.ORIENTATION_VERTICAL);//竖向
}
ScrollSpeedManger.reflectLayoutManager(this);
//取中间数来作为起始位置
int index = (Integer.MAX_VALUE / 2) - (Integer.MAX_VALUE / 2 % mData.size());
viewPager2.setCurrentItem(index,false);
mIndicator.setCount(mData.size());
mIndicator.setCurrent(index % mData.size());
}
public void setData(ArrayList<? extends IBannerData> bannerData){
setData(new BannerAdapter(bannerData));
}
//事件分发 的可见性改变 如果能见度为 可见 就开始启动循环 否则就暂停循环 返回销毁
@Override
protected void onVisibilityChanged(@NonNull View changedView, int visibility) {
super.onVisibilityChanged(changedView, visibility);
if(visibility == VISIBLE){
startLoop();
}else{
stopLoop();
}
}
private Runnable mLoopTask = new Runnable() {//创建多线程
@Override
public void run() {
//获取当前项目item
int currentItem = viewPager2.getCurrentItem();
//给当前项目 传入item .和 smoothScroll 是否平滑滚动
viewPager2.setCurrentItem(++currentItem, true);
//getHandler()使用PostDelayed方法，切换间隔时间后调用此Runnable对象
getHandler().postDelayed(mLoopTask,mInterval);
}
};
private void startLoop(){
if (isAutoLoop&&mData.size()>0&&mData!=null){
getHandler().postDelayed(mLoopTask,mInterval);
}
}
private void stopLoop(){
//删除回调mLoopTask
getHandler().removeCallbacks(mLoopTask);
}
//dp 转px
public int dip2px(float dpValue) {
final float scale = getContext().getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
}
在.xml文件中使用自定义banner
<com.wds.bannerlib.banner.Banner
android:id="@+id/banner"
android:layout_width="0dp"
android:layout_height="200dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:bannerTitleTextSize="14dp"
app:bannerMarginTitleStart="13dp"
app:bannerTitleTextColor="@color/white"
app:bannerIndicatorRadio="3dp"
app:bannerIndicatorSelectColor="@color/white"
app:bannerIndicatorUnSelectColor="@color/gray"
app:bannerIndicatorEndMargin="13dp"
app:bannerPageScrollTime="1000"
app:bannerPageSwitchInterval="3000"
app:bannerPageScrollMode="horizontal"
/>
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