Android 新闻快讯app

package com.tiger.quicknews.wedget.viewimage.Tricks; import android.annotation.SuppressLint; import android.content.Context; import android.content.res.Resources; 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 android.support.v4.os.ParcelableCompat; import android.support.v4.os.ParcelableCompatCreatorCallbacks; import android.support.v4.view.AccessibilityDelegateCompat; import android.support.v4.view.KeyEventCompat; import android.support.v4.view.MotionEventCompat; import android.support.v4.view.PagerAdapter; import android.support.v4.view.VelocityTrackerCompat; import android.support.v4.view.ViewCompat; import android.support.v4.view.ViewConfigurationCompat; import android.support.v4.view.accessibility.AccessibilityEventCompat; import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat; import android.support.v4.view.accessibility.AccessibilityRecordCompat; import android.support.v4.widget.EdgeEffectCompat; 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 java.lang.reflect.Method; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; /** * Layout manager that allows the user to flip left and right * through pages of data. You supply an implementation of a * {@link PagerAdapter} to generate the pages that the view shows. * * <p>Note this class is currently under early design and * development. The API will likely change in later updates of * the compatibility library, requiring changes to the source code * of apps when they are compiled against the newer version.</p> * * <p>ViewPager is most often used in conjunction with {@link android.app.Fragment}, * which is a convenient way to supply and manage the lifecycle of each page. * There are standard adapters implemented for using fragments with the ViewPager, * which cover the most common use cases. These are * {@link android.support.v4.app.FragmentPagerAdapter} and * {@link android.support.v4.app.FragmentStatePagerAdapter}; each of these * classes have simple code showing how to build a full user interface * with them. * * <p>Here is a more complicated example of ViewPager, using it in conjuction * with {@link android.app.ActionBar} tabs. You can find other examples of using * ViewPager in the API 4+ Support Demos and API 13+ Support Demos sample code. * * {@sample development/samples/Support13Demos/src/com/example/android/supportv13/app/ActionBarTabsPager.java * complete} */ /** * @author daimajia : I just remove the if condition in setPageTransformer() to * make it compatiable with Android 2.0+ of course, with the help of the * NineOldDroid. Thanks to JakeWharton. * http://github.com/JakeWharton/NineOldAndroids */ public class ViewPagerEx extends ViewGroup { private static final String TAG = "ViewPagerEx"; 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 widthFactor; 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() { @Override 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 mTopPageBounds; private int mBottomPageBounds; // 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 mLeftEdge; private EdgeEffectCompat mRightEdge; private boolean mFirstLayout = true; private boolean mNeedCalculatePageOffsets = false; private boolean mCalledSuper; private int mDecorChildCount; private OnPageChangeListener mOnPageChangeListener; private OnPageChangeListener mInternalPageChangeListener; private OnAdapterChangeListener mAdapterChangeListener; private PageTransformer mPageTransformer; private Method mSetChildrenDrawingOrderEnabled;