public class SlideBrowsePageView extends ViewGroup{ private String TAG = "Workspace"; private static final int INVALID_SCREEN = -1; private static final int SNAP_VELOCITY = 10; private int mDefaultScreen = 0; private boolean mFirstLayout = true; private int mCurrentScreen; private int mNextScreen = INVALID_SCREEN; private Scroller mScroller; private VelocityTracker mVelocityTracker; private float mLastMotionX; private int mMaximumVelocity; public SlideBrowsePageView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public SlideBrowsePageView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); setHapticFeedbackEnabled(false); initWorkspace(); } private void initWorkspace() { Context context = getContext(); mScroller = new Scroller(context); mCurrentScreen = mDefaultScreen; final ViewConfiguration configuration = ViewConfiguration.get(getContext()); mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); } @Override public void computeScroll() { if (mScroller.computeScrollOffset()) { mScrollX = mScroller.getCurrX(); mScrollY = mScroller.getCurrY(); postInvalidate(); } else if (mNextScreen != INVALID_SCREEN) { mCurrentScreen = Math.max(0, Math.min(mNextScreen, getChildCount() - 1)); mNextScreen = INVALID_SCREEN; } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); final int width = MeasureSpec.getSize(widthMeasureSpec); // The children are given the same width and height as the workspace final int count = getChildCount(); for (int i = 0; i < count; i++) { getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec); } if (mFirstLayout) { scrollTo(mCurrentScreen * width, 0); mFirstLayout = false; } } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { int childLeft = 0; final int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.getVisibility() != View.GONE) { final int childWidth = child.getMeasuredWidth(); child.layout(childLeft, 0, childLeft + childWidth, child.getMeasuredHeight()); childLeft += childWidth; } } } @Override public boolean onTouchEvent(MotionEvent ev) { if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); } mVelocityTracker.addMovement(ev); final int action = ev.getAction(); final float x = ev.getX(); switch (action) { case MotionEvent.ACTION_DOWN: if (!mScroller.isFinished()) { mScroller.abortAnimation(); } // Remember where the motion event started mLastMotionX = x; break; case MotionEvent.ACTION_MOVE: final int deltaX = (int) (mLastMotionX - x); mLastMotionX = x; if (deltaX < 0 && getScrollX() > 0) { scrollBy(Math.max(-getScrollX(), deltaX), 0); invalidate(); } else if (deltaX > 0) { final int availableToScroll = getChildAt(getChildCount() - 1).getRight() - getScrollX() - getWidth(); if (availableToScroll > 0) { scrollBy(Math.min(availableToScroll, deltaX), 0); invalidate(); } } break; case MotionEvent.ACTION_UP: final VelocityTracker velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); int velocityX = (int) velocityTracker.getXVelocity(); if (velocityX > SNAP_VELOCITY && mCurrentScreen > 0) { // Fling hard enough to move left snapToScreen(mCurrentScreen - 1); } else if (velocityX < -SNAP_VELOCITY && mCurrentScreen < getChildCount() - 1) { // Fling hard enough to move right snapToScreen(mCurrentScreen + 1); } else { snapToDestination(); } if (null != mVelocityTracker) { mVelocityTracker.recycle(); mVelocityTracker = null; } break; } return true; } void snapToDestination() { final int screenWidth = getWidth(); final int delta = (getScrollX() < (screenWidth * mCurrentScreen) ? screenWidth * - 6 / 10 : screenWidth * 6 / 10); final int whichScreen = (getScrollX() + delta) / screenWidth; snapToScreen(whichScreen); } void snapToScreen(int whichScreen) { if (!mScroller.isFinished()){ return; } whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1)); boolean changingScreens = whichScreen != mCurrentScreen; mNextScreen = whichScreen; View focusedChild = getFocusedChild(); if (focusedChild != null && changingScreens && focusedChild == getChildAt(mCurrentScreen)) { focusedChild.clearFocus(); } final int newX = whichScreen * getWidth(); final int delta = newX - getScrollX(); mScroller.startScroll(getScrollX(), 0, delta, 0, (int) (Math.abs(delta) * 0.6)); invalidate(); } @Override protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) { int focusableScreen; if (mNextScreen != INVALID_SCREEN) { focusableScreen = mNextScreen; } else { focusableScreen = mCurrentScreen; } getChildAt(focusableScreen).requestFocus(direction, previouslyFocusedRect); return false; } /** * Interface used to allow the creator of a switcher to run some code when * a view on the switcher is clicked. */ public static interface OnClickListener { /** * This method will be invoked when a view in the switcher is clicked. */ public abstract void onClick(int position); } /** * Interface used to allow the creator of a switcher to run some code when * a view on the switcher is selected. */ public static interface OnSelectListener { /** * This method will be invoked when a view in the switcher is selected. */ public abstract void onSelect(int position); } }
WeatherPageAdapter mAdapter = new WeatherPageAdapter(list, this); for(int i=0;i<mAdapter.getCount();i++){ switcher.addView(mAdapter.getView(i, null, null)); }
