基于Android的万岳直播商城系统开源设计源码

package com.wanyue.common.custom; import android.content.Context; import android.content.res.TypedArray; import android.database.DataSetObserver; import android.graphics.Canvas; import android.graphics.Rect; import android.graphics.drawable.Drawable; import android.os.Build; import android.os.Bundle; import android.os.Parcel; import android.os.Parcelable; import android.os.SystemClock; import androidx.core.os.ParcelableCompat; import androidx.core.os.ParcelableCompatCreatorCallbacks; import androidx.core.view.AccessibilityDelegateCompat; import androidx.core.view.MotionEventCompat; import androidx.core.view.VelocityTrackerCompat; import androidx.core.view.ViewCompat; import androidx.core.view.ViewConfigurationCompat; import androidx.core.view.accessibility.AccessibilityEventCompat; import androidx.core.view.accessibility.AccessibilityNodeInfoCompat; import androidx.core.view.accessibility.AccessibilityRecordCompat; import androidx.core.widget.EdgeEffectCompat; import androidx.viewpager.widget.PagerAdapter; import androidx.viewpager.widget.ViewPager; import android.util.AttributeSet; import android.util.Log; import android.view.FocusFinder; import android.view.Gravity; import android.view.KeyEvent; import android.view.MotionEvent; import android.view.SoundEffectConstants; import android.view.VelocityTracker; import android.view.View; import android.view.ViewConfiguration; import android.view.ViewGroup; import android.view.ViewParent; import android.view.accessibility.AccessibilityEvent; import android.view.animation.Interpolator; import android.widget.Scroller; import org.jetbrains.annotations.NotNull; import java.lang.reflect.Method; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; /** * 垂直ViewPager */ public class VerticalViewPager extends ViewGroup { private static final String TAG = "ViewPager"; private static final boolean DEBUG = false; private static final boolean USE_CACHE = false; private static final int DEFAULT_OFFSCREEN_PAGES = 1; private static final int MAX_SETTLE_DURATION = 600; // ms private static final int MIN_DISTANCE_FOR_FLING = 25; // dips private static final int DEFAULT_GUTTER_SIZE = 16; // dips private static final int MIN_FLING_VELOCITY = 400; // dips private static final int[] LAYOUT_ATTRS = new int[]{ android.R.attr.layout_gravity }; /** * Used to track what the expected number of items in the adapter should be. * If the app changes this when we don't expect it, we'll throw a big obnoxious exception. */ private int mExpectedAdapterCount; static class ItemInfo { Object object; int position; boolean scrolling; float heightFactor; float offset; } private static final Comparator<ItemInfo> COMPARATOR = new Comparator<ItemInfo>() { @Override public int compare(ItemInfo lhs, ItemInfo rhs) { return lhs.position - rhs.position; } }; private static final Interpolator sInterpolator = new Interpolator() { public float getInterpolation(float t) { t -= 1.0f; return t * t * t * t * t + 1.0f; } }; private final ArrayList<ItemInfo> mItems = new ArrayList<ItemInfo>(); private final ItemInfo mTempItem = new ItemInfo(); private final Rect mTempRect = new Rect(); private PagerAdapter mAdapter; private int mCurItem; // Index of currently displayed page. private int mRestoredCurItem = -1; private Parcelable mRestoredAdapterState = null; private ClassLoader mRestoredClassLoader = null; private Scroller mScroller; private PagerObserver mObserver; private int mPageMargin; private Drawable mMarginDrawable; private int mLeftPageBounds; private int mRightPageBounds; // Offsets of the first and last items, if known. // Set during population, used to determine if we are at the beginning // or end of the pager data set during touch scrolling. private float mFirstOffset = -Float.MAX_VALUE; private float mLastOffset = Float.MAX_VALUE; private int mChildWidthMeasureSpec; private int mChildHeightMeasureSpec; private boolean mInLayout; private boolean mScrollingCacheEnabled; private boolean mPopulatePending; private int mOffscreenPageLimit = DEFAULT_OFFSCREEN_PAGES; private boolean mIsBeingDragged; private boolean mIsUnableToDrag; private boolean mIgnoreGutter; private int mDefaultGutterSize; private int mGutterSize; private int mTouchSlop; /** * Position of the last motion event. */ private float mLastMotionX; private float mLastMotionY; private float mInitialMotionX; private float mInitialMotionY; /** * ID of the active pointer. This is used to retain consistency during * drags/flings if multiple pointers are used. */ private int mActivePointerId = INVALID_POINTER; /** * Sentinel value for no current active pointer. * Used by {@link #mActivePointerId}. */ private static final int INVALID_POINTER = -1; /** * Determines speed during touch scrolling */ private VelocityTracker mVelocityTracker; private int mMinimumVelocity; private int mMaximumVelocity; private int mFlingDistance; private int mCloseEnough; // If the pager is at least this close to its final position, complete the scroll // on touch down and let the user interact with the content inside instead of // "catching" the flinging pager. private static final int CLOSE_ENOUGH = 2; // dp private boolean mFakeDragging; private long mFakeDragBeginTime; private EdgeEffectCompat mTopEdge; private EdgeEffectCompat mBottomEdge; private boolean mFirstLayout = true; private boolean mNeedCalculatePageOffsets = false; private boolean mCalledSuper; private int mDecorChildCount; private ViewPager.OnPageChangeListener mOnPageChangeListener; private ViewPager.OnPageChangeListener mInternalPageChangeListener; private OnAdapterChangeListener mAdapterChangeListener; private ViewPager.PageTransformer mPageTransformer; private Method mSetChildrenDrawingOrderEnabled; private static final int DRAW_ORDER_DEFAULT = 0; private static final int DRAW_ORDER_FORWARD = 1; private static final int DRAW_ORDER_REVERSE = 2; private int mDrawingOrder; private ArrayList<View> mDrawingOrderedChildren; private static final ViewPositionComparator sPositionComparator = new ViewPositionComparator(); /** * 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; private final Runnable mEndScrollRunnable = new Runnable() { public void run() { setScrollState(SCROLL_STATE_IDLE); populate(); } }; private int mScrollState = SCROLL_STATE_IDLE; /** * Used internally to monitor when adapters are switched. */ interface OnAdapterChangeListener { public void onAdapterChanged(PagerAdapter oldAdapter, PagerAdapter newAdapter); } /** * Used internally to tag special types of child views that should be added as * pager decorations by default. */ interface Decor { } public VerticalViewPager(Context context) { super(context); initViewPager(); } public VerticalViewPager(Context context, AttributeSet attrs) { super(context, attrs); initViewPager(); } void initVi