package com.sxjs.common.widget.autoscrollviewpager;
import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.support.annotation.DrawableRes;
import android.support.annotation.LayoutRes;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewCompat;
import android.support.v4.view.ViewPager;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.sxjs.common.R;
import com.sxjs.common.widget.autoscrollviewpager.transformer.BGAPageTransformer;
import com.sxjs.common.widget.autoscrollviewpager.transformer.TransitionEffect;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.List;
import static android.view.Gravity.BOTTOM;
public class BGABanner extends RelativeLayout implements BGAViewPager.AutoPlayDelegate, ViewPager.OnPageChangeListener {
private static final int RMP = LayoutParams.MATCH_PARENT;
private static final int RWC = LayoutParams.WRAP_CONTENT;
private static final int LWC = LinearLayout.LayoutParams.WRAP_CONTENT;
private static final int NO_PLACEHOLDER_DRAWABLE = -1;
private static final int VEL_THRESHOLD = 400;
private BGAViewPager mViewPager;
private List<View> mHackyViews;
private List<View> mViews;
private List<String> mTips;
private LinearLayout mPointRealContainerLl;
private TextView mTipTv;
private boolean mAutoPlayAble = true;
private int mAutoPlayInterval = 3000;
private int mPageChangeDuration = 800;
private int mPointGravity = Gravity.CENTER_HORIZONTAL | BOTTOM;
private int mPointLeftRightMargin;
private int mPointTopBottomMargin;
private int mPointContainerLeftRightPadding;
private int mTipTextSize;
private int mTipTextColor = Color.WHITE;
private int mPointDrawableResId = R.drawable.bga_banner_selector_point_solid;
private Drawable mPointContainerBackgroundDrawable;
private AutoPlayTask mAutoPlayTask;
private int mPageScrollPosition;
private float mPageScrollPositionOffset;
private TransitionEffect mTransitionEffect;
private ImageView mPlaceholderIv;
private ImageView.ScaleType mPlaceholderScaleType = ImageView.ScaleType.CENTER_CROP;
private int mPlaceholderDrawableResId = NO_PLACEHOLDER_DRAWABLE;
private List<? extends Object> mModels;
private Delegate mDelegate;
private Adapter mAdapter;
private int mOverScrollMode = OVER_SCROLL_NEVER;
private ViewPager.OnPageChangeListener mOnPageChangeListener;
private boolean mIsNumberIndicator = false;
private TextView mNumberIndicatorTv;
private int mNumberIndicatorTextColor = Color.WHITE;
private int mNumberIndicatorTextSize;
private Drawable mNumberIndicatorBackground;
private boolean mIsNeedShowIndicatorOnOnlyOnePage;
private boolean mAllowUserScrollable = true;
private View mSkipView;
private View mEnterView;
private GuideDelegate mGuideDelegate;
private int mContentBottomMargin;
private boolean mIsFirstInvisible = true;
/**
* 纵横比测量
*/
private final BannerAspectRatioMeasure.Spec mMeasureSpec = new BannerAspectRatioMeasure.Spec();
/**
* 宽高显示比例
*/
private float mAspectRatio = 0;
private static final ImageView.ScaleType[] sScaleTypeArray = {
ImageView.ScaleType.MATRIX,
ImageView.ScaleType.FIT_XY,
ImageView.ScaleType.FIT_START,
ImageView.ScaleType.FIT_CENTER,
ImageView.ScaleType.FIT_END,
ImageView.ScaleType.CENTER,
ImageView.ScaleType.CENTER_CROP,
ImageView.ScaleType.CENTER_INSIDE
};
private BGAOnNoDoubleClickListener mGuideOnNoDoubleClickListener = new BGAOnNoDoubleClickListener() {
@Override
public void onNoDoubleClick(View v) {
if (mGuideDelegate != null) {
mGuideDelegate.onClickEnterOrSkip();
}
}
};
public BGABanner(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public BGABanner(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initDefaultAttrs(context);
initCustomAttrs(context, attrs);
initView(context);
}
private void initDefaultAttrs(Context context) {
mAutoPlayTask = new AutoPlayTask(this);
mPointLeftRightMargin = BGABannerUtil.dp2px(context, 3);
mPointTopBottomMargin = BGABannerUtil.dp2px(context, 3);
mPointContainerLeftRightPadding = BGABannerUtil.dp2px(context, 10);
mTipTextSize = BGABannerUtil.sp2px(context, 10);
mPointContainerBackgroundDrawable = new ColorDrawable(Color.parseColor("#44aaaaaa"));
mTransitionEffect = TransitionEffect.Default;
mNumberIndicatorTextSize = BGABannerUtil.sp2px(context, 10);
mContentBottomMargin = 0;
}
private void initCustomAttrs(Context context, AttributeSet attrs) {
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.BGABanner);
final int N = typedArray.getIndexCount();
for (int i = 0; i < N; i++) {
initCustomAttr(typedArray.getIndex(i), typedArray);
}
typedArray.recycle();
}
private void initCustomAttr(int attr, TypedArray typedArray) {
if (attr == R.styleable.BGABanner_banner_pointDrawable) {
mPointDrawableResId = typedArray.getResourceId(attr, R.drawable.bga_banner_selector_point_solid);
} else if (attr == R.styleable.BGABanner_banner_pointContainerBackground) {
mPointContainerBackgroundDrawable = typedArray.getDrawable(attr);
} else if (attr == R.styleable.BGABanner_banner_pointLeftRightMargin) {
mPointLeftRightMargin = typedArray.getDimensionPixelSize(attr, mPointLeftRightMargin);
} else if (attr == R.styleable.BGABanner_banner_pointContainerLeftRightPadding) {
mPointContainerLeftRightPadding = typedArray.getDimensionPixelSize(attr, mPointContainerLeftRightPadding);
} else if (attr == R.styleable.BGABanner_banner_pointTopBottomMargin) {
mPointTopBottomMargin = typedArray.getDimensionPixelSize(attr, mPointTopBottomMargin);
} else if (attr == R.styleable.BGABanner_banner_indicatorGravity) {
mPointGravity = typedArray.getInt(attr, mPointGravity);
} else if (attr == R.styleable.BGABanner_banner_pointAutoPlayAble) {
mAutoPlayAble = typedArray.getBoolean(attr, mAutoPlayAble);
} else if (attr == R.styleable.BGABanner_banner_pointAutoPlayInterval) {
mAutoPlayInterval = typedArray.getInteger(attr, mAutoPlayInterval);
} else if (attr == R.styleable.BGABanner_banner_pageChangeDuration) {
mPageChangeDuration = typedArray.getInteger(attr, mPageChangeDuration);
} else if (attr == R.styleable.BGABanner_banner_transitionEffect) {
int ordinal = typedArray.getInt(attr, TransitionEffect.Accordion.ordinal());
mTransitionEffect = TransitionEffect.values()[ordinal];
} else if (attr == R.styleable.BGABanner_banner_tipTextColor) {
mTipTextColor = typedArray.getColor(attr, mTipTextColor);
} else if (attr == R.styleable.BGABanner_banner_tipTextSize) {
mTipTextSize = typedArray.getDimensionPixelSize(attr, mTipTextSize);
} else if (attr == R.styleable.BGABanner_banner_placeholderDrawable) {
mPlaceholderDrawableResId = typedArray.getResourceId(attr, mPlaceholderDrawableResId);
} else if (attr == R.styleable.BGABanner_banner_isNumberIndicator) {
mIsNumberIndicator = typedArray.getBoolean(attr, mIsNumberIndicator);
} else if (attr == R.styleable.BGABanner_banner_numberIndicatorTextColor) {
mNumberIndicatorTextColor = typedArray.getColor(attr, mNumberIndicatorTextColor);
} else if (attr == R.styleable.BGABanner_banner_numberIndicatorTextSize) {
mNumberIndicatorTextSize = typedArray.getDimensionPixelSize(attr, mNumberIndicatorTextSize);
} else if (attr == R.styleable.BGABanner_banner_numberIndicatorBackground) {
mNumberIndicatorBackground = typedArray.getDrawable(attr);
} else if (attr == R.styleable.BGABanner_banner_isNeedShowIndicatorOnOnlyOnePage) {
mIsNeedShowIndicatorOnOnlyOnePage = typedArray.getBoolean(attr, mIsNeedShowIndicatorOnOnlyOnePage);
} else if (attr == R.styleable.BGABanner_banner_contentBottomMargin) {
mContentBottomMargin = typedArray.getDimensionPixelSize(attr, mContentBottomMargin);
}
else if (attr == R.styleable.BGABanner_android_scaleType) {
final int index = typedArray.getInt(attr, -1);
if (index >= 0 && index < sScaleTypeArray.length) {
mPlaceholderScaleType = sScaleTypeArray[index];
}
}
else if (attr == R.styleable.BGABanner_banner_viewAspectRatio) {
mAspectRatio = typedArray.getFloat(attr,0);
}
}
/**
* Sets the desired aspect ratio (w/h).
*/
public void setAspectRatio(float aspectRatio) {
if (aspectRatio == mAspectRatio) {
return;
}
mAspectRatio = aspectRatio;
requestLayout();
}
/**
* Gets the desired aspect ratio (w/h).
*/
public float getAspectRatio() {
return mAspectRatio;
}
private void initView(Context context) {
RelativeLayout pointContainerRl = new RelativeLayout(context);
if (Build.VERSION.SDK_INT >= 16) {
pointContainerRl.setBackground(mPointContainerBackgroundDrawable);
} else {
pointContainerRl.setBackgroundDrawable(mPointContainerBackgroundDrawable);
}
pointContainerRl.setPadding(mPointContainerLeftRightPadding, mPointTopBottomMargin, mPointContainerLeftRightPadding, mPointTopBottomMargin);
LayoutParams pointContainerLp = new LayoutParams(RMP, RWC);
// 处理圆点在顶部还是底部
if ((mPointGravity & Gravity.VERTICAL_GRAVITY_MASK) == Gravity.TOP) {
pointContainerLp.addRule(RelativeLayout.ALIGN_PARENT_TOP);
} else {
pointContainerLp.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
}
addView(pointContainerRl, pointContainerLp);
LayoutParams indicatorLp = new LayoutParams(RWC, RWC);
indicatorLp.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
if (mIsNumberIndicator) {
mNumberIndicatorTv = new TextView(context);
mNumberIndicatorTv.setId(R.id.banner_indicatorId);
mNumberIndicatorTv.setGravity(Gravity.CENTER_VERTICAL);
mNumberIndicatorTv.setSingleLine(true);
mNumberIndicatorTv.setEllipsize(TextUtils.TruncateAt.END);
mNumberIndicatorTv.setTextColor(mNumberIndicatorTextColor);
mNumberIndicatorTv.setTextSize(TypedValue.COMPLEX_UNIT_PX, mNumberIndicatorTextSize);
mNumberIndicatorTv.setVisibility(View.INVISIBLE);
if (mNumberIndicatorBackground != null) {
if (Build.VERSION.SDK_INT >= 16) {
mNumberIndicatorTv.setBackground(mNumberIndicatorBackground);
} else {
mNumberIndicatorTv.setBackgroundDrawable(mNumberIndicatorBackground);
}
}
pointContainerRl.addView(mNumberIndicatorTv, indicatorLp);
} else {
mPointRealContainerLl = new LinearLayout(context);
mPointRealContainerLl.setId(R.id.banner_indicatorId);
mPointRealContainerLl.setOrientation(LinearLayout.HORIZONTAL);
mPointRealContainerLl.setGravity(Gravity.CENTER_VERTICAL);
pointContainerRl.addView(mPointRealContainerLl, indicatorLp);
}
LayoutParams tipLp = new LayoutParams(RMP, RWC);
tipLp.addRule(CENTER_VERTICAL);
mTipTv = new TextView(context);
mTipTv.setGravity(Gravity.CENTER_VERTICAL);
mTipTv.setSingleLine(true);
mTipTv.setEllipsize(TextUtils.TruncateAt.END);
mTipTv.setTextColor(mTipTextColor);
mTipTv.setTextSize(TypedValue.COMPLEX_UNIT_PX, mTipTextSize);
pointContainerRl.addView(mTipTv, tipLp);
int horizontalGravity = mPointGravity & Gravity.HORIZONTAL_GRAVITY_MASK;
// 处理圆点在左边、右边还是水平居中
if (horizontalGravity == Gravity.LEFT) {
indicatorLp.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
tipLp.addRule(RelativeLayout.RIGHT_OF, R.id.banner_indicatorId);
mTipTv.setGravity(Gravity.CENTER_VERTICAL | Gravity.RIGHT);
} else if (horizontalGravity == Gravity.RIGHT) {
indicatorLp.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
tipLp.addRule(RelativeLayout.LEFT_OF, R.id.banner_indicatorId);
} else {
indicatorLp.addRule(RelativeLayout.CENTER_HORIZONTAL);
tipLp.addRule(RelativeLayout.LEFT_OF, R.id.banner_indicatorId);
}
showPlaceholder();
}
public void showPlaceholder() {
if (mPlaceholderIv == null && mPlaceholderDrawableResId != NO_PLACEHOLDER_DRAWABLE) {
mPlaceholderIv = BGABannerUtil.getItemImageView(getContext(), mPlaceholderDrawableResId);
mPlaceholderIv.setScaleType(mPlaceholderScaleType);
LayoutParams layoutParams = new LayoutParams(RMP, RMP);
layoutParams.setMargins(0, 0, 0, mContentBottomMargin);
addView(mPlaceholderIv, layoutParams);
}
}
/**
* 设置页码切换过程的时间长度
*
* @param duration 页码切换过程的时间长度
*/
public void setPageChangeDuration(int duration) {
if (duration >= 0 && duration <= 2000) {
mPageChangeDuration = duration;
if (mViewPager != null) {
mViewPager.setPageChangeDuration(duration);
}
}
}
/**
* 设置是否开启自动轮播，需要在 setData 方法之前调用，并且调了该方法后必须再调用一次 setData 方法
* 例如根据图片当图片数量大于 1 时开启自动轮播，等于 1 时不开启自动轮播
* mDefaultBanner.setAutoPlayAble(bannerModel.imgs.size() > 1);
* mDefaultBanner.setData(bannerModel.imgs, bannerModel.tips);
*
* @param autoPlayAble
*/
public void setAutoPlayAble(boolean autoPlayAble) {
mAutoPlayAble = autoPlayAble;
stopAutoPlay();
if (mViewPager != null && mViewPager.getAdapter() != null) {
mViewPager.getAdapter().notifyDataSetChanged();
}
}
/**
* 设置自动轮播的时间间隔
*
* @param autoPlayInterval
*/
public void setAutoPlayInterval(int autoPlayInterval) {
mAutoPlayInterval = autoPlayInterval;
}
/**
* 设置每一页的控件、数据模型和文案
*
* @param views 每一页的控件集合
* @param models 每一页的数据模型集合
* @param tips 每一页的提示文案集合
*/
public void setData(List<View> views, List<? extends Object> models, List<String> tips) {
if (views == null || views.size() < 1) {
mAutoPlayAble = false;
views = new ArrayList<>();
models = new ArrayList<>();
tips = new ArrayList<>();
}
if (mAutoPlayAble && views.size() < 3 && mHackyViews == null) {
mAutoPlayAble = false;
}
mModels = models;
mViews = views;
mTips = tips;
initIndicator();
initViewPager();
removePlaceholder();
}
/**
* 设置布局资源id、数据模型和文案
*
* @param layoutResId item布局文件资源id
* @param models 每一页的数据模型集合
* @param tips 每一页的提示文案集合
*/
public void setData(@LayoutRes int layoutResId, List<? extends Object> models, List<String> tips) {
mViews = new ArrayList<>();
if (models == null) {
models = new ArrayList<>();
tips = new ArrayList<>();
}
for (int i = 0; i < models.size(); i++) {
mViews.add(View.inflate(getContext(), layoutResId, null));
}
if (mAutoPlayAble && mViews.size() < 3) {
mHackyViews = new ArrayList<>(mViews);
mHackyViews.add(View.inflate(getContext(), layoutResId, null));
if (mHackyViews.size() == 2) {
mHackyViews.add(View.inflate(getContext(), layoutResId, null));
}
}
setData(mViews, models, tips);
}
/**
* 设置数据模型和文案，布局资源默认为 ImageView
*
* @param models 每一页的数据模型集合
* @param tips 每一页的提示文案集合
*/
public void setData(List<? extends Object> models, List<String> tips) {
setData(R.layout.bga_banner_item_image, models, tips);
}
/**
* 设置每一页的控件集合，主要针对引导页的情况
*
* @param views 每一页的控件集合
*/
public void setData(List<View> views) {
setData(views, null, null);
}
/**
* 设置每一页图片的资源 id，主要针对引导页的情况
*
* @param resIds
*/
public void setData(@DrawableRes int... resIds) {
List<View> views = new ArrayList<>();
for (int resId : resIds) {
views.add(BGABannerUtil.getItemImageView(getContext(), resId));
}
setData(views);
}
/**
* 设置是否允许用户手指滑动
*
* @param allowUserScrollable true表示允许跟随用户触摸滑动，false反之
*/
public void setAllowUserScrollable(boolean allowUserScrollable) {
mAllowUserScrollable = allowUserScrollable;
if (mViewPager != null) {
mViewPager.setAllowUserScrollable(mAllowUserScrollable);
}
}
/**
* 添加ViewPager滚动监听器
*
* @param onPageChangeListener
*/
public void setOnPageChangeListener(ViewPager.OnPageChangeListener onPageChangeListener) {
mOnPageChangeListener = onPageChangeListener;
}
/**
* 设置进入按钮和跳过按钮控件资源 id，需要开发者自己处理这两个按钮的点击事件
*
* @param enterResId 进入按钮控件
* @param skipResId 跳过按钮控件
*/
public void setEnterSkipViewId(int enterResId, int skipResId) {
if (enterResId != 0) {
mEnterView = ((Activity) getContext()).findViewById(enterResId);
}
if (skipResId != 0) {
mSkipView = ((Activity) getContext()).findViewById(skipResId);
}
}
/**
* 设置进入按钮和跳过按钮控件资源 id 及其点击事件监听器
* 如果进入按钮和跳过按钮有一个不存在的话就传 0
* 在 BGABanner 里已经帮开发者处理了重复点击事件
* 在 BGABanner 里已经帮开发者处理了「跳过按钮」和「进入按钮」的显示与隐藏
*
* @param enterResId 进入按钮控件资源 id，没有的话就传 0
* @param skipResId 跳过按钮控件资源 id，没有的话就传 0
* @param guideDelegate 引导页「进入」和「跳过」按钮点击事件监听器
*/
public void setEnterSkipViewIdAndDelegate(int enterResId, int skipResId, GuideDelegate guideDelegate) {
if (guideDelegate != null) {
mGuideDelegate = guideDelegate;
if (enterResId != 0) {
mEnterView = ((Activity) getContext()).findViewById(enterResId);
mEnterView.setOnClickListener(mGuideOnNoDoubleClickListener);
}
if (skipResId != 0) {
mSkipView = ((Activity) getContext()).findViewById(skipResId);
mSkipView.setOnClickListener(mGuideOnNoDoubleClickListener);
}
}
}
/**
* 获取当前选中界面索引
*
* @return
*/
public int getCurrentItem() {
if (mViewPager == null || mViews == null) {
return 0;
} else {
return mViewPager.getCurrentItem() % mViews.size();
}
}
/**
* 获取广告页面总个数
*
* @return
*/
public int getItemCount() {
return mViews == null ? 0 : mViews.size();
}
public List<? extends View> getViews() {
return mViews;
}
public <VT extends View> VT getItemView(int position) {
return mViews == null ? null : (VT) mViews.get(position);
}
public ImageView getItemImageView(int position) {
return getItemView(position);
}
public List<String> getTips() {
return mTips;
}
public BGAViewPager getViewPager() {
return mViewPager;
}
public void setOverScrollMode(int overScrollMode) {
mOverScrollMode = overScrollMode;
if (mViewPager != null) {
mViewPager.setOverScrollMode(mOverScrollMode);
}
}
private void initIndicator() {
if (mPointRealContainerLl != null) {
mPointRealContainerLl.removeAllViews();
if (mIsNeedShowIndicatorOnOnlyOnePage || (!mIsNeedShowIndicatorOnOnlyOnePage && mViews.size() > 1)) {
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LWC, LWC);
lp.setMargins(mPointLeftRightMargin, mPointTopBottomMargin, mPointLeftRightMargin, mPointTopBottomMargin);
ImageView imageView;
for (int i = 0; i < mViews.size(); i++) {
imageView = new ImageView(getContext());
imageView.setLayoutParams(lp);
imageView.setImageResource(mPointDrawableResId);
mPointRealContainerLl.addView(imageView);
}
}
}
if (mNumberIndicatorTv != null) {
if (mIsNeedShowIndicatorOnOnlyOnePage || (!mIsNeedShowIndicatorOnOnlyOnePage && mViews.size() > 1)) {
mNumberIndicatorTv.setVisibility(View.VISIBLE);
} else {
mNumberIndicatorTv.setVisibility(View.INVISIBLE);
}
}
}
private void initViewPager() {
if (mViewPager != null && this.equals(mViewPager.getParent())) {
this.removeView(mViewPager);
mViewPager = null;
}
mViewPager = new BGAViewPager(getContext());
mViewPager.setOffscreenPageLimit(1);
mViewPager.setAdapter(new PageAdapter());
mViewPager.addOnPageChangeListener(this);
mViewPager.setOverScrollMode(mOverScrollMode);
mViewPager.setAllowUserScrollable(mAllowUserScrollable);
mViewPager.setPageTransformer(true, BGAPageTransformer.getPageTransformer(mTransitionEffect));
setPageChangeDuration(mPageChangeDuration);
LayoutParams layoutParams = new LayoutParams(RMP, RMP);
layoutParams.setMargins(0, 0, 0, mContentBottomMargin);
addView(mViewPager, 0, layoutParams);
if (mEnterView != null || mSkipView != null) {
mViewPager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
if (position == getItemCount() - 2) {
if (mEnterView != null) {
ViewCompat.setAlpha(mEnterView, positionOffset);
}
if (mSkipView != null) {
ViewCompat.setAlpha(mSkipView, 1.0f - positionOffset);
}
if (positionOffset > 0.5f) {
if (mEnterView != null) {
mEnterView.setVisibility(View.VISIBLE);
}
if (mSkipView != null) {
mSkipView.setVisibility(View.GONE);
}
} else {
if (mEnterView != null) {
mEnterView.setVisibility(View.GONE);
}
if (mSkipView != null) {
mSkipView.setVisibility(View.VISIBLE);
}
}
} else if (position == getItemCount() - 1) {
if (mSkipView != null) {
mSkipView.setVisibility(View.GONE);
}
if (mEnterView != null) {
mEnterView.setVisibility(View.VISIBLE);
ViewCompat.setAlpha(mEnterView, 1.0f);
}
} else {
if (mSkipView != null) {
mSkipView.setVisibility(View.VISIBLE);
ViewCompat.setAlpha(mSkipView, 1.0f);
}
if (mEnterView != null) {
mEnterView.setVisibility(View.GONE);
}
}
}
});
}
if (mAutoPlayAble) {
mViewPager.setAutoPlayDelegate(this);
int zeroItem = Integer.MAX_VALUE / 2 - (Integer.MAX_VALUE / 2) % mViews.size();
mViewPager.setCurrentItem(zeroItem);
startAutoPlay();
} else {
switchToPoint(0);
}
}
public void removePlaceholder() {
if (mPlaceholderIv != null && this.equals(mPlaceholderIv.getParent())) {
removeView(mPlaceholderIv);
mPlaceholderIv = null;
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
mMeasureSpec.width = widthMeasureSpec;
mMeasureSpec.height = heightMeasureSpec;
BannerAspectRatioMeasure.updateMeasureSpec(
mMeasureSpec,
mAspectRatio,
getLayoutParams(),
getPaddingLeft() + getPaddingRight(),
getPaddingTop() + getPaddingBottom());
super.onMeasure(mMeasureSpec.width, mMeasureSpec.height);
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if (mAutoPlayAble) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
stopAutoPlay();
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
startAutoPlay();
break;
}
}
return super.dispatchTouchEvent(ev);
}
/**
* 设置当只有一页数据时是否显示指示器
*
* @param isNeedShowIndicatorOnOnlyOnePage
*/
public void setIsNeedShowIndicatorOnOnlyOnePage(boolean isNeedShowIndicatorOnOnlyOnePage) {
mIsNeedShowIndicatorOnOnlyOnePage = isNeedShowIndicatorOnOnlyOnePage;
}
public void setCurrentItem(int item) {
if (mViewPager == null || mViews == null || item > getItemCount() - 1) {
return;
}
if (mAutoPlayAble) {
int realCurrentItem = mViewPager.getCurrentItem();
int currentItem = realCurrentItem % mViews.size();
int offset = item - currentItem;
// 这里要使用循环递增或递减设置，否则会ANR
if (offset < 0) {
for (int i = -1; i >= offset; i--) {
mViewPager.setCurrentItem(realCurrentItem + i, false);
}
} else if (offset > 0) {
for (int i = 1; i <= offset; i++) {
mViewPager.setCurrentItem(realCurrentItem + i, false);
}
}
startAutoPlay();
} else {
mViewPager.setCurrentItem(item, false);
}
}
@Override
protected void onVisibilityChanged(View changedView, int visibility) {
super.onVisibilityChanged(changedView, visibility);
if (visibility == VISIBLE) {
startAutoPlay();
} else if (visibility == INVISIBLE || visibility == GONE) {
onInvisibleToUser();
}
}
private void onInvisibleToUser() {
stopAutoPlay();
// 处理 RecyclerView 中从对用户不可见变为可见时卡顿的问题
if (!mIsFirstInvisible && mAutoPlayAble && mViewPager != null && getItemCount() > 0) {
switchToNextPage();
}
mIsFirstInvisible = false;
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
onInvisibleToUser();
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
startAutoPlay();
}
public void startAutoPlay() {
stopAutoPlay();
if (mAutoPlayAble) {
postDelayed(mAutoPlayTask, mAutoPlayInterval);
}
}
public void stopAutoPlay() {
if (mAutoPlayTask != null) {
removeCallbacks(mAutoPlayTask);
}
}
private void switchToPoint(int newCurrentPoint) {
if (mTipTv != null) {
if (mTips == null || mTips.size() < 1 || newCurrentPoint >= mTips.size()) {
mTipTv.setVisibility(View.GONE);
} else {
mTipTv.setVisibility(View.VISIBLE);
mTipTv.setText(mTips.get(newCurrentPoint));
}
}
if (mPointRealContainerLl != null) {
if (mViews != null && mViews.size() > 0 && newCurrentPoint < mViews.size() && ((mIsNeedShowIndicatorOnOnlyOnePage || (!mIsNeedShowIndicatorOnOnlyOnePage && mViews.size() > 1)))) {
mPointRealContainerLl.setVisibility(View.VISIBLE);
for (int i = 0; i < mPointRealContainerLl.getChildCount(); i++) {
mPointRealContainerLl.getChildAt(i).setEnabled(i == newCurrentPoint);
// 处理指示器选中和未选中状态图片尺寸不相等
mPointRealContainerLl.getChildAt(i).requestLayout();
}
} else {
mPointRealContainerLl.setVisibility(View.GONE);
}
}
if (mNumberIndicatorTv != null) {
if (mViews != null && mViews.size() > 0 && newCurrentPoint < mViews.size() && ((mIsNeedShowIndicatorOnOnlyOnePage || (!mIsNeedShowIndicatorOnOnlyOnePage && mViews.size() > 1)))) {
mNumberIndicatorTv.setVisibility(View.VISIBLE);
mNumberIndicatorTv.setText((newCurrentPoint + 1) + "/" + mViews.size());
} else {
mNumberIndicatorTv.setVisibility(View.GONE);
}
}
}
/**
* 设置页面切换换动画
*
* @param effect
*/
public void setTransitionEffect(TransitionEffect effect) {
mTransitionEffect = effect;
if (mViewPager != null) {
initViewPager();
if (mHackyViews == null) {
BGABannerUtil.resetPageTransformer(mViews);
} else {
BGABannerUtil.resetPageTransformer(mHackyViews);
}
}
}
/**
* 设置自定义页面切换动画
*
* @param transformer
*/
public void setPageTransformer(ViewPager.PageTransformer transformer) {
if (transformer != null && mViewPager != null) {
mViewPager.setPageTransformer(true, transformer);
}
}
/**
* 切换到下一页
*/
private void switchToNextPage() {
if (mViewPager != null) {
mViewPager.setCurrentItem(mViewPager.getCurrentItem() + 1);
}
}
@Override
public void handleAutoPlayActionUpOrCancel(float xVelocity) {
if (mViewPager != null) {
if (mPageScrollPosition < mViewPager.getCurrentItem()) {
// 往右滑
if (xVelocity > VEL_THRESHOLD || (mPageScrollPositionOffset < 0.7f && xVelocity > -VEL_THRESHOLD)) {
mViewPager.setBannerCurrentItemInternal(mPageScrollPosition, true);
} else {
mViewPager.setBannerCurrentItemInternal(mPageScrollPosition + 1, true);
}
} else {
// 往左滑
if (xVelocity < -VEL_THRESHOLD || (mPageScrollPositionOffset > 0.3f && xVelocity < VEL_THRESHOLD)) {
mViewPager.setBannerCurrentItemInternal(mPageScrollPosition + 1, true);
} else {
mViewPager.setBannerCurrentItemInternal(mPageScrollPosition, true);
}
}
}
}
@Override
public void onPageSelected(int position) {
position = position % mViews.size();
switchToPoint(position);
if (mOnPageChangeListener != null) {
mOnPageChangeListener.onPageSelected(position);
}
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
mPageScrollPosition = position;
mPageScrollPositionOffset = positionOffset;
if (mTipTv != null) {
if (mTips != null && mTips.size() > 0) {
mTipTv.setVisibility(View.VISIBLE);
int leftPosition = position % mTips.size();
int rightPosition = (position + 1) % mTips.size();
if (rightPosition < mTips.size() && leftPosition < mTips.size()) {
if (positionOffset > 0.5) {
mTipTv.setText(mTips.get(rightPosition));
ViewCompat.setAlpha(mTipTv, positionOffset);
} else {
ViewCompat.setAlpha(mTipTv, 1 - positionOffset);
mTipTv.setText(mTips.get(leftPosition));
}
}
} else {
mTipTv.setVisibility(View.GONE);
}
}
if (mOnPageChangeListener != null) {
mOnPageChangeListener.onPageScrolled(position % mViews.size(), positionOffset, positionOffsetPixels);
}
}
@Override
public void onPageScrollStateChanged(int state) {
if (mOnPageChangeListener != null) {
mOnPageChangeListener.onPageScrollStateChanged(state);
}
}
public void setDelegate(Delegate delegate) {
mDelegate = delegate;
}
public void setAdapter(Adapter adapter) {
mAdapter = adapter;
}
private class PageAdapter extends PagerAdapter {
@Override
public int getCount() {
return mViews == null ? 0 : (mAutoPlayAble ? Integer.MAX_VALUE : mViews.size());
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
final int finalPosition = position % mViews.size();
View view;
if (mHackyViews == null) {
view = mViews.get(finalPosition);
} else {
view = mHackyViews.get(position % mHackyViews.size());
}
if (mDelegate != null) {
view.setOnClickListener(new BGAOnNoDoubleClickListener() {
@Override
public void onNoDoubleClick(View view) {
int currentPosition = mViewPager.getCurrentItem() % mViews.size();
mDelegate.onBannerItemClick(BGABanner.this, view, mModels == null ? null : mModels.get(currentPosition), currentPosition);
}
});
}
if (mAdapter != null) {
mAdapter.fillBannerItem(BGABanner.this, view, mModels == null ? null : mModels.get(finalPosition), finalPosition);
}
ViewParent viewParent = view.getParent();
if (viewParent != null) {
((ViewGroup) viewParent).removeView(view);
}
container.addView(view);
return view;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
}
private static class AutoPlayTask implements Runnable {
private final WeakReference<BGABanner> mBanner;
private AutoPlayTask(BGABanner banner) {
mBanner = new WeakReference<>(banner);
}
@Override
public void run() {
BGABanner banner = mBanner.get();
if (banner != null) {
banner.switchToNextPage();
banner.startAutoPlay();
}
}
}
/**
* item 点击事件监听器，在 BGABanner 里已经帮开发者处理了防止重复点击事件
*
* @param <V> item 视图类型，如果没有在 setData 方法里指定自定义的 item 布局资源文件的话，这里的 V 就是 ImageView
* @param <M> item 数据模型
*/
public interface Delegate<V extends View, M> {
void onBannerItemClick(BGABanner banner, V itemView, M model, int position);
}
/**
* 适配器，在 fillBannerItem 方法中填充数据，加载网络图片等
*
* @param <V> item 视图类型，如果没有在 setData 方法里指定自定义的 item 布局资源文件的话，这里的 V 就是 ImageView
* @param <M> item 数据模型
*/
public interface Adapter<V extends View, M> {
void fillBannerItem(BGABanner banner, V itemView, M model, int position);
}
/**
* 引导页「进入」和「跳过」按钮点击事件监听器，在 BGABanner 里已经帮开发者处理了防止重复点击事件
*/
public interface GuideDelegate {
void onClickEnterOrSkip();
}
}