首先,导入包:compile files("libs/nineoldandroids-2.4.0.jar")
r然后在main中创建一个widget包。
c创建ViewDragHelper类
public class ViewDragHelper { private static final String TAG = "ViewDragHelper"; public static final int INVALID_POINTER = -1 public static final int STATE_IDLE = 0; public static final int STATE_DRAGGING = 1; public static final int STATE_SETTLING = 2; public static final int EDGE_LEFT = 1 << 0; public static final int EDGE_RIGHT = 1 << 1 public static final int EDGE_TOP = 1 << 2; public static final int EDGE_BOTTOM = 1 << 3 public static final int EDGE_ALL = EDGE_LEFT | EDGE_TOP | EDGE_RIGHT | EDGE_BOTTOM; public static final int DIRECTION_HORIZONTAL = 1 << 0; public static final int DIRECTION_VERTICAL = 1 << 1; public static final int DIRECTION_ALL = DIRECTION_HORIZONTAL | DIRECTION_VERTICAL; private static final int EDGE_SIZE = 20; // dp private static final int BASE_SETTLE_DURATION = 256; // ms private static final int MAX_SETTLE_DURATION = 600; // ms // Current drag state; idle, dragging or settling private int mDragState; // Distance to travel before a drag may begin private int mTouchSlop; // Last known position/pointer tracking private int mActivePointerId = INVALID_POINTER; private float[] mInitialMotionX; private float[] mInitialMotionY; private float[] mLastMotionX; private float[] mLastMotionY; private int[] mInitialEdgesTouched; private int[] mEdgeDragsInProgress; private int[] mEdgeDragsLocked; private int mPointersDown; private VelocityTracker mVelocityTracker; private final float mMaxVelocity; private float mMinVelocity; private final int mEdgeSize; private int mTrackingEdges; private final ScrollerCompat mScroller; private final Callback mCallback; private View mCapturedView; private boolean mReleaseInProgress; private final ViewGroup mParentView; 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 Runnable mSetIdleRunnable = new Runnable() {public void run() { setDragState(STATE_IDLE);} }; private ViewDragHelper(Context context, ViewGroup forParent, Callback cb) {if (forParent == null) { throw new IllegalArgumentException("Parent view may not be null");}if (cb == null) { throw new IllegalArgumentException("Callback may not be null");}mParentView = forParent;mCallback = cb;final ViewConfiguration vc = ViewConfiguration.get(context);final float density = context.getResources().getDisplayMetrics().density;mEdgeSize = (int) (EDGE_SIZE * density + 0.5f);mTouchSlop = vc.getScaledTouchSlop();mMaxVelocity = vc.getScaledMaximumFlingVelocity();mMinVelocity = vc.getScaledMinimumFlingVelocity();mScroller = ScrollerCompat.create(context, sInterpolator); } public static abstract class Callback {public void onViewDragStateChanged(int state) {}public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {}public void onViewCaptured(View capturedChild, int activePointerId) {}public void onViewReleased(View releasedChild, float xvel, float yvel) {}public void onEdgeTouched(int edgeFlags, int pointerId) {}public boolean onEdgeLock(int edgeFlags) { return false;}public void onEdgeDragStarted(int edgeFlags, int pointerId) {}public int getOrderedChildIndex(int index) { return index;}public int getViewHorizontalDragRange(View child) { return 0;}public int getViewVerticalDragRange(View child) { return 0;}public abstract boolean tryCaptureView(View child, int pointerId);public int clampViewPositionHorizontal(View child, int left, int dx) { return 0;}public int clampViewPositionVertical(View child, int top, int dy) { return 0;} } public static ViewDragHelper create(ViewGroup forParent, Callback cb) {return new ViewDragHelper(forParent.getContext(), forParent, cb); } public static ViewDragHelper create(ViewGroup forParent, float sensitivity, Callback cb) {final ViewDragHelper helper = create(forParent, cb);helper.mTouchSlop = (int) (helper.mTouchSlop * (1 / sensitivity));return helper; } public void setMinVelocity(float minVel) {mMinVelocity = minVel; } public float getMinVelocity() {return mMinVelocity; } public int getViewDragState() {return mDragState; } public void setEdgeTrackingEnabled(int edgeFlags) {mTrackingEdges = edgeFlags; } public int getEdgeSize() {return mEdgeSize; } public void captureChildView(View childView, int activePointerId) {if (childView.getParent() != mParentView) { throw new IllegalArgumentException("captureChildView: parameter must be a descendant " + "of the ViewDragHelper"s tracked parent view (" + mParentView + ")");}mCapturedView = childView;mActivePointerId = activePointerId;mCallback.onViewCaptured(childView, activePointerId);setDragState(STATE_DRAGGING); } public View getCapturedView() {return mCapturedView; } public int getActivePointerId() {return mActivePointerId; } public int getTouchSlop() {return mTouchSlop; } public void cancel() {mActivePointerId = INVALID_POINTER;clearMotionHistory();if (mVelocityTracker != null) { mVelocityTracker.recycle(); mVelocityTracker = null;} } public void abort() {cancel();if (mDragState == STATE_SETTLING) { final int oldX = mScroller.getCurrX(); final int oldY = mScroller.getCurrY(); mScroller.abortAnimation(); final int newX = mScroller.getCurrX(); final int newY = mScroller.getCurrY(); mCallback.onViewPositionChanged(mCapturedView, newX, newY, newX - oldX, newY - oldY);}setDragState(STATE_IDLE); } public boolean smoothSlideViewTo(View child, int finalLeft, int finalTop) {mCapturedView = child;mActivePointerId = INVALID_POINTER;boolean continueSliding = forceSettleCapturedViewAt(finalLeft, finalTop, 0, 0);if (!continueSliding && mDragState == STATE_IDLE && mCapturedView != null) { // If we"re in an IDLE state to begin with and aren"t moving anywhere, we // end up having a non-null capturedView with an IDLE dragState mCapturedView = null;}return continueSliding; } public boolean settleCapturedViewAt(int finalLeft, int finalTop) {if (!mReleaseInProgress) { throw new IllegalStateException("Cannot settleCapturedViewAt outside of a call to " + "Callback#onViewReleased");}return forceSettleCapturedViewAt(finalLeft, finalTop,(int) VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId),(int) VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId)); } private boolean forceSettleCapturedViewAt(int finalLeft, int finalTop, int xvel, int yvel) {final int startLeft = mCapturedView.getLeft();final int startTop = mCapturedView.getTop();final int dx = finalLeft - startLeft;final int dy = finalTop - startTop;if (dx == 0 && dy == 0) { // Nothing to do. Send callbacks, be done. mScroller.abortAnimation(); setDragState(STATE_IDLE); return false;}final int duration = computeSettleDuration(mCapturedView, dx, dy, xvel, yvel);mScroller.startScroll(startLeft, startTop, dx, dy, duration);setDragState(STATE_SETTLING);return true; } private int computeSettleDuration(View child, int dx, int dy, int xvel, int yvel) {xvel = clampMag(xvel, (int) mMinVelocity, (int) mMaxVelocity);yvel = clampMag(yvel, (int) mMinVelocity, (int) mMaxVelocity);final int absDx = Math.abs(dx);final int absDy = Math.abs(dy);final int absXVel = Math.abs(xvel);final int absYVel = Math.abs(yvel);final int addedVel = absXVel + absYVel;final int addedDistance = absDx + absDy;final float xweight = xvel != 0 ? (float) absXVel / addedVel :(float) absDx / addedDistance;final float yweight = yvel != 0 ? (float) absYVel / addedVel :(float) absDy / addedDistance;int xduration = computeAxisDuration(dx, xvel, mCallback.getViewHorizontalDragRange(child));int yduration = computeAxisDuration(dy, yvel, mCallback.getViewVerticalDragRange(child));return (int) (xduration * xweight + yduration * yweight); } private int computeAxisDuration(int delta, int velocity, int motionRange) {if (delta == 0) { return 0;}final int width = mParentView.getWidth();final int halfWidth = width / 2;final float distanceRatio = Math.min(1f, (float) Math.abs(delta) / width);final float distance = halfWidth + halfWidth *distanceInfluenceForSnapDuration(distanceRatio);int duration;velocity = Math.abs(velocity);if (velocity > 0) { duration = 4 * Math.round(1000 * Math.abs(distance / velocity));} else { final float range = (float) Math.abs(delta) / motionRange; duration = (int) ((range + 1) * BASE_SETTLE_DURATION);}return Math.min(duration, MAX_SETTLE_DURATION); } private static int clampMag(int value, int absMin, int absMax) {final int absValue = Math.abs(value);if (absValue < absMin) return 0;if (absValue > absMax) return value > 0 ? absMax : -absMax;return value; } private static float clampMag(float value, float absMin, float absMax) {final float absValue = Math.abs(value);if (absValue < absMin) return 0;if (absValue > absMax) return value > 0 ? absMax : -absMax;return value; } private static float distanceInfluenceForSnapDuration(float f) {f -= 0.5f; // center the values about 0.f *= 0.3f * Math.PI / 2.0f;return (float) Math.sin(f); } public void flingCapturedView(int minLeft, int minTop, int maxLeft, int maxTop) {if (!mReleaseInProgress) { throw new IllegalStateException("Cannot flingCapturedView outside of a call to " + "Callback#onViewReleased");}mScroller.fling(mCapturedView.getLeft(), mCapturedView.getTop(),(int) VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId),(int) VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId),minLeft, maxLeft, minTop, maxTop);setDragState(STATE_SETTLING); } public boolean continueSettling(boolean deferCallbacks) {if (mDragState == STATE_SETTLING) { boolean keepGoing = mScroller.computeScrollOffset(); final int x = mScroller.getCurrX(); final int y = mScroller.getCurrY(); final int dx = x - mCapturedView.getLeft(); final int dy = y - mCapturedView.getTop(); if (dx != 0) {mCapturedView.offsetLeftAndRight(dx); } if (dy != 0) {mCapturedView.offsetTopAndBottom(dy); } if (dx != 0 || dy != 0) {mCallback.onViewPositionChanged(mCapturedView, x, y, dx, dy); } if (keepGoing && x == mScroller.getFinalX() && y == mScroller.getFinalY()) {// Close enough. The interpolator/scroller might think we"re still moving// but the user sure doesn"t.mScroller.abortAnimation();keepGoing = false; } if (!keepGoing) {if (deferCallbacks) { mParentView.post(mSetIdleRunnable);} else { setDragState(STATE_IDLE);} }}return mDragState == STATE_SETTLING; } private void dispatchViewReleased(float xvel, float yvel) {mReleaseInProgress = true;mCallback.onViewReleased(mCapturedView, xvel, yvel);mReleaseInProgress = false;if (mDragState == STATE_DRAGGING) { // onViewReleased didn"t call a method that would have changed this. Go idle. setDragState(STATE_IDLE);} } private void clearMotionHistory() {if (mInitialMotionX == null) { return;}Arrays.fill(mInitialMotionX, 0);Arrays.fill(mInitialMotionY, 0);Arrays.fill(mLastMotionX, 0);Arrays.fill(mLastMotionY, 0);Arrays.fill(mInitialEdgesTouched, 0);Arrays.fill(mEdgeDragsInProgress, 0);Arrays.fill(mEdgeDragsLocked, 0);mPointersDown = 0; } private void clearMotionHistory(int pointerId) {if (mInitialMotionX == null) { return;}mInitialMotionX[pointerId] = 0;mInitialMotionY[pointerId] = 0;mLastMotionX[pointerId] = 0;mLastMotionY[pointerId] = 0;mInitialEdgesTouched[pointerId] = 0;mEdgeDragsInProgress[pointerId] = 0;mEdgeDragsLocked[pointerId] = 0;mPointersDown &= ~(1 << pointerId); } private void ensureMotionHistorySizeForId(int pointerId) {if (mInitialMotionX == null || mInitialMotionX.length <= pointerId) { float[] imx = new float[pointerId + 1]; float[] imy = new float[pointerId + 1]; float[] lmx = new float[pointerId + 1]; float[] lmy = new float[pointerId + 1]; int[] iit = new int[pointerId + 1]; int[] edip = new int[pointerId + 1]; int[] edl = new int[pointerId + 1]; if (mInitialMotionX != null) {System.arraycopy(mInitialMotionX, 0, imx, 0, mInitialMotionX.length);System.arraycopy(mInitialMotionY, 0, imy, 0, mInitialMotionY.length);System.arraycopy(mLastMotionX, 0, lmx, 0, mLastMotionX.length);System.arraycopy(mLastMotionY, 0, lmy, 0, mLastMotionY.length);System.arraycopy(mInitialEdgesTouched, 0, iit, 0, mInitialEdgesTouched.length);System.arraycopy(mEdgeDragsInProgress, 0, edip, 0, mEdgeDragsInProgress.length);System.arraycopy(mEdgeDragsLocked, 0, edl, 0, mEdgeDragsLocked.length); } mInitialMotionX = imx; mInitialMotionY = imy; mLastMotionX = lmx; mLastMotionY = lmy; mInitialEdgesTouched = iit; mEdgeDragsInProgress = edip; mEdgeDragsLocked = edl;} } private void saveInitialMotion(float x, float y, int pointerId) {ensureMotionHistorySizeForId(pointerId);mInitialMotionX[pointerId] = mLastMotionX[pointerId] = x;mInitialMotionY[pointerId] = mLastMotionY[pointerId] = y;mInitialEdgesTouched[pointerId] = getEdgesTouched((int) x, (int) y);mPointersDown |= 1 << pointerId; } private void saveLastMotion(MotionEvent ev) {final int pointerCount = MotionEventCompat.getPointerCount(ev);for (int i = 0; i < pointerCount; i++) { final int pointerId = MotionEventCompat.getPointerId(ev, i); final float x = MotionEventCompat.getX(ev, i); final float y = MotionEventCompat.getY(ev, i); mLastMotionX[pointerId] = x; mLastMotionY[pointerId] = y;} } public boolean isPointerDown(int pointerId) {return (mPointersDown & 1 << pointerId) != 0; } void setDragState(int state) {mParentView.removeCallbacks(mSetIdleRunnable);if (mDragState != state) { mDragState = state; mCallback.onViewDragStateChanged(state); if (mDragState == STATE_IDLE) {mCapturedView = null; }} } boolean tryCaptureViewForDrag(View toCapture, int pointerId) {if (toCapture == mCapturedView && mActivePointerId == pointerId) { // Already done! return true;}if (toCapture != null && mCallback.tryCaptureView(toCapture, pointerId)) { mActivePointerId = pointerId; captureChildView(toCapture, pointerId); return true;}return false; } protected boolean canScroll(View v, boolean checkV, int dx, int dy, int x, int y) {if (v instanceof ViewGroup) { final ViewGroup group = (ViewGroup) v; final int scrollX = v.getScrollX(); final int scrollY = v.getScrollY(); final int count = group.getChildCount(); // Count backwards - let topmost views consume scroll distance first. for (int i = count - 1; i >= 0; i--) {// TODO: Add versioned support here for transformed views.// This will not work for transformed views in Honeycomb+final View child = group.getChildAt(i);if (x + scrollX >= child.getLeft() && x + scrollX < child.getRight() &&y + scrollY >= child.getTop() && y + scrollY < child.getBottom() &&canScroll(child, true, dx, dy, x + scrollX - child.getLeft(),y + scrollY - child.getTop())) { return true;} }}return checkV && (ViewCompat.canScrollHorizontally(v, -dx) ||ViewCompat.canScrollVertically(v, -dy)); } public boolean shouldInterceptTouchEvent(MotionEvent ev) {final int action = MotionEventCompat.getActionMasked(ev);final int actionIndex = MotionEventCompat.getActionIndex(ev);if (action == MotionEvent.ACTION_DOWN) { // Reset things for a new event stream, just in case we didn"t get // the whole previous stream. cancel();}if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain();}mVelocityTracker.addMovement(ev);switch (action) { case MotionEvent.ACTION_DOWN: {final float x = ev.getX();final float y = ev.getY();final int pointerId = MotionEventCompat.getPointerId(ev, 0);saveInitialMotion(x, y, pointerId);final View toCapture = findTopChildUnder((int) x, (int) y);// Catch a settling view if possible.if (toCapture == mCapturedView && mDragState == STATE_SETTLING) { tryCaptureViewForDrag(toCapture, pointerId);}final int edgesTouched = mInitialEdgesTouched[pointerId];if ((edgesTouched & mTrackingEdges) != 0) { mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId);}break; } case MotionEventCompat.ACTION_POINTER_DOWN: {final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex);final float x = MotionEventCompat.getX(ev, actionIndex);final float y = MotionEventCompat.getY(ev, actionIndex);saveInitialMotion(x, y, pointerId);// A ViewDragHelper can only manipulate one view at a time.if (mDragState == STATE_IDLE) { final int edgesTouched = mInitialEdgesTouched[pointerId]; if ((edgesTouched & mTrackingEdges) != 0) {mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId); }} else if (mDragState == STATE_SETTLING) { // Catch a settling view if possible. final View toCapture = findTopChildUnder((int) x, (int) y); if (toCapture == mCapturedView) {tryCaptureViewForDrag(toCapture, pointerId); }}break; } case MotionEvent.ACTION_MOVE: {if (mInitialMotionX == null || mInitialMotionY == null) break;// First to cross a touch slop over a draggable view wins. Also report edge drags.final int pointerCount = MotionEventCompat.getPointerCount(ev);for (int i = 0; i < pointerCount; i++) { final int pointerId = MotionEventCompat.getPointerId(ev, i); final float x = MotionEventCompat.getX(ev, i); final float y = MotionEventCompat.getY(ev, i); final float dx = x - mInitialMotionX[pointerId]; final float dy = y - mInitialMotionY[pointerId]; final View toCapture = findTopChildUnder((int) x, (int) y); final boolean pastSlop = toCapture != null && checkTouchSlop(toCapture, dx, dy); if (pastSlop) {// check the callback"s// getView[Horizontal|Vertical]DragRange methods to know// if you can move at all along an axis, then see if it// would clamp to the same value. If you can"t move at// all in every dimension with a nonzero range, bail.final int oldLeft = toCapture.getLeft();final int targetLeft = oldLeft + (int) dx;final int newLeft = mCallback.clampViewPositionHorizontal(toCapture,targetLeft, (int) dx);final int oldTop = toCapture.getTop();final int targetTop = oldTop + (int) dy;final int newTop = mCallback.clampViewPositionVertical(toCapture, targetTop,(int) dy);final int horizontalDragRange = mCallback.getViewHorizontalDragRange(toCapture);final int verticalDragRange = mCallback.getViewVerticalDragRange(toCapture);if ((horizontalDragRange == 0 || horizontalDragRange > 0&& newLeft == oldLeft) && (verticalDragRange == 0|| verticalDragRange > 0 && newTop == oldTop)) { break;} } reportNewEdgeDrags(dx, dy, pointerId); if (mDragState == STATE_DRAGGING) {// Callback might have started an edge dragbreak; } if (pastSlop && tryCaptureViewForDrag(toCapture, pointerId)) {break; }}saveLastMotion(ev);break; } case MotionEventCompat.ACTION_POINTER_UP: {final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex);clearMotionHistory(pointerId);break; } case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: {cancel();break; } default:break;}return mDragState == STATE_DRAGGING; } public void processTouchEvent(MotionEvent ev) {final int action = MotionEventCompat.getActionMasked(ev);final int actionIndex = MotionEventCompat.getActionIndex(ev);if (action == MotionEvent.ACTION_DOWN) { // Reset things for a new event stream, just in case we didn"t get // the whole previous stream. cancel();}if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain();}mVelocityTracker.addMovement(ev);switch (action) { case MotionEvent.ACTION_DOWN: {final float x = ev.getX();final float y = ev.getY();final int pointerId = MotionEventCompat.getPointerId(ev, 0);final View toCapture = findTopChildUnder((int) x, (int) y);saveInitialMotion(x, y, pointerId);// Since the parent is already directly processing this touch event,// there is no reason to delay for a slop before dragging.// Start immediately if possible.tryCaptureViewForDrag(toCapture, pointerId);final int edgesTouched = mInitialEdgesTouched[pointerId];if ((edgesTouched & mTrackingEdges) != 0) { mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId);}break; } case MotionEventCompat.ACTION_POINTER_DOWN: {final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex);final float x = MotionEventCompat.getX(ev, actionIndex);final float y = MotionEventCompat.getY(ev, actionIndex);saveInitialMotion(x, y, pointerId);// A ViewDragHelper can only manipulate one view at a time.if (mDragState == STATE_IDLE) { // If we"re idle we can do anything! Treat it like a normal down event. final View toCapture = findTopChildUnder((int) x, (int) y); tryCaptureViewForDrag(toCapture, pointerId); final int edgesTouched = mInitialEdgesTouched[pointerId]; if ((edgesTouched & mTrackingEdges) != 0) {mCallback.onEdgeTouched(edgesTouched & mTrackingEdges, pointerId); }} else if (isCapturedViewUnder((int) x, (int) y)) { // We"re still tracking a captured view. If the same view is under this // point, we"ll swap to controlling it with this pointer instead. // (This will still work if we"re "catching" a settling view.) tryCaptureViewForDrag(mCapturedView, pointerId);}break; } case MotionEvent.ACTION_MOVE: {if (mDragState == STATE_DRAGGING) { final int index = MotionEventCompat.findPointerIndex(ev, mActivePointerId); final float x = MotionEventCompat.getX(ev, index); final float y = MotionEventCompat.getY(ev, index); final int idx = (int) (x - mLastMotionX[mActivePointerId]); final int idy = (int) (y - mLastMotionY[mActivePointerId]); dragTo(mCapturedView.getLeft() + idx, mCapturedView.getTop() + idy, idx, idy); saveLastMotion(ev);} else { // Check to see if any pointer is now over a draggable view. final int pointerCount = MotionEventCompat.getPointerCount(ev); for (int i = 0; i < pointerCount; i++) {final int pointerId = MotionEventCompat.getPointerId(ev, i);final float x = MotionEventCompat.getX(ev, i);final float y = MotionEventCompat.getY(ev, i);final float dx = x - mInitialMotionX[pointerId];final float dy = y - mInitialMotionY[pointerId];reportNewEdgeDrags(dx, dy, pointerId);if (mDragState == STATE_DRAGGING) { // Callback might have started an edge drag. break;}final View toCapture = findTopChildUnder((int) x, (int) y);if (checkTouchSlop(toCapture, dx, dy) &&tryCaptureViewForDrag(toCapture, pointerId)) { break;} } saveLastMotion(ev);}break; } case MotionEventCompat.ACTION_POINTER_UP: {final int pointerId = MotionEventCompat.getPointerId(ev, actionIndex);if (mDragState == STATE_DRAGGING && pointerId == mActivePointerId) { // Try to find another pointer that"s still holding on to the captured view. int newActivePointer = INVALID_POINTER; final int pointerCount = MotionEventCompat.getPointerCount(ev); for (int i = 0; i < pointerCount; i++) {final int id = MotionEventCompat.getPointerId(ev, i);if (id == mActivePointerId) { // This one"s going away, skip. continue;}final float x = MotionEventCompat.getX(ev, i);final float y = MotionEventCompat.getY(ev, i);if (findTopChildUnder((int) x, (int) y) == mCapturedView &&tryCaptureViewForDrag(mCapturedView, id)) { newActivePointer = mActivePointerId; break;} } if (newActivePointer == INVALID_POINTER) {// We didn"t find another pointer still touching the view, release it.releaseViewForPointerUp(); }}clearMotionHistory(pointerId);break; } case MotionEvent.ACTION_UP: {if (mDragState == STATE_DRAGGING) { releaseViewForPointerUp();}cancel();break; } case MotionEvent.ACTION_CANCEL: {if (mDragState == STATE_DRAGGING) { dispatchViewReleased(0, 0);}cancel();break; } default:break;} } private void reportNewEdgeDrags(float dx, float dy, int pointerId) {int dragsStarted = 0;if (checkNewEdgeDrag(dx, dy, pointerId, EDGE_LEFT)) { dragsStarted |= EDGE_LEFT;}if (checkNewEdgeDrag(dy, dx, pointerId, EDGE_TOP)) { dragsStarted |= EDGE_TOP;}if (checkNewEdgeDrag(dx, dy, pointerId, EDGE_RIGHT)) { dragsStarted |= EDGE_RIGHT;}if (checkNewEdgeDrag(dy, dx, pointerId, EDGE_BOTTOM)) { dragsStarted |= EDGE_BOTTOM;}if (dragsStarted != 0) { mEdgeDragsInProgress[pointerId] |= dragsStarted; mCallback.onEdgeDragStarted(dragsStarted, pointerId);} } private boolean checkNewEdgeDrag(float delta, float odelta, int pointerId, int edge) {final float absDelta = Math.abs(delta);final float absODelta = Math.abs(odelta);if ((mInitialEdgesTouched[pointerId] & edge) != edge || (mTrackingEdges & edge) == 0 ||(mEdgeDragsLocked[pointerId] & edge) == edge ||(mEdgeDragsInProgress[pointerId] & edge) == edge ||(absDelta <= mTouchSlop && absODelta <= mTouchSlop)) { return false;}if (absDelta < absODelta * 0.5f && mCallback.onEdgeLock(edge)) { mEdgeDragsLocked[pointerId] |= edge; return false;}return (mEdgeDragsInProgress[pointerId] & edge) == 0 && absDelta > mTouchSlop; } private boolean checkTouchSlop(View child, float dx, float dy) {if (child == null) { return false;}final boolean checkHorizontal = mCallback.getViewHorizontalDragRange(child) > 0;final boolean checkVertical = mCallback.getViewVerticalDragRange(child) > 0;if (checkHorizontal && checkVertical) { return dx * dx + dy * dy > mTouchSlop * mTouchSlop;} else if (checkHorizontal) { return Math.abs(dx) > mTouchSlop;} else if (checkVertical) { return Math.abs(dy) > mTouchSlop;}return false; } public boolean checkTouchSlop(int directions) {final int count = mInitialMotionX.length;for (int i = 0; i < count; i++) { if (checkTouchSlop(directions, i)) {return true; }}return false; } public boolean checkTouchSlop(int directions, int pointerId) {if (!isPointerDown(pointerId)) { return false;}final boolean checkHorizontal = (directions & DIRECTION_HORIZONTAL) == DIRECTION_HORIZONTAL;final boolean checkVertical = (directions & DIRECTION_VERTICAL) == DIRECTION_VERTICAL;final float dx = mLastMotionX[pointerId] - mInitialMotionX[pointerId];final float dy = mLastMotionY[pointerId] - mInitialMotionY[pointerId];if (checkHorizontal && checkVertical) { return dx * dx + dy * dy > mTouchSlop * mTouchSlop;} else if (checkHorizontal) { return Math.abs(dx) > mTouchSlop;} else if (checkVertical) { return Math.abs(dy) > mTouchSlop;}return false; } public boolean isEdgeTouched(int edges) {final int count = mInitialEdgesTouched.length;for (int i = 0; i < count; i++) { if (isEdgeTouched(edges, i)) {return true; }}return false; } public boolean isEdgeTouched(int edges, int pointerId) {return isPointerDown(pointerId) && (mInitialEdgesTouched[pointerId] & edges) != 0; } private void releaseViewForPointerUp() {mVelocityTracker.computeCurrentVelocity(1000, mMaxVelocity);final float xvel = clampMag(VelocityTrackerCompat.getXVelocity(mVelocityTracker, mActivePointerId),mMinVelocity, mMaxVelocity);final float yvel = clampMag(VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId),mMinVelocity, mMaxVelocity);dispatchViewReleased(xvel, yvel); } private void dragTo(int left, int top, int dx, int dy) {int clampedX = left;int clampedY = top;final int oldLeft = mCapturedView.getLeft();final int oldTop = mCapturedView.getTop();if (dx != 0) { clampedX = mCallback.clampViewPositionHorizontal(mCapturedView, left, dx); mCapturedView.offsetLeftAndRight(clampedX - oldLeft);}if (dy != 0) { clampedY = mCallback.clampViewPositionVertical(mCapturedView, top, dy); mCapturedView.offsetTopAndBottom(clampedY - oldTop);}if (dx != 0 || dy != 0) { final int clampedDx = clampedX - oldLeft; final int clampedDy = clampedY - oldTop; mCallback.onViewPositionChanged(mCapturedView, clampedX, clampedY, clampedDx, clampedDy);} } public boolean isCapturedViewUnder(int x, int y) {return isViewUnder(mCapturedView, x, y); } public boolean isViewUnder(View view, int x, int y) {if (view == null) { return false;}return x >= view.getLeft() &&x < view.getRight() &&y >= view.getTop() &&y < view.getBottom(); } public View findTopChildUnder(int x, int y) {final int childCount = mParentView.getChildCount();for (int i = childCount - 1; i >= 0; i--) { final View child = mParentView.getChildAt(mCallback.getOrderedChildIndex(i)); if (x >= child.getLeft() && x < child.getRight() && y >= child.getTop() && y < child.getBottom()) {return child; }}return null; } private int getEdgesTouched(int x, int y) {int result = 0;if (x < mParentView.getLeft() + mEdgeSize) result |= EDGE_LEFT;if (y < mParentView.getTop() + mEdgeSize) result |= EDGE_TOP;if (x > mParentView.getRight() - mEdgeSize) result |= EDGE_RIGHT;if (y > mParentView.getBottom() - mEdgeSize) result |= EDGE_BOTTOM;return result; }}DragLayout布局继承FrameLayout:
public class DragLayout extends FrameLayout { private static final boolean IS_SHOW_SHADOW = true; //手势处理类 private GestureDetectorCompat gestureDetector; //视图拖拽移动帮助类 private ViewDragHelper dragHelper; //滑动监听器 private DragListener dragListener; //水平拖拽的距离 private int range; //宽度 private int width; //高度 private int height; //main视图距离在ViewGroup距离左边的距离 private int mainLeft; private Context context; private ImageView ivShadow; //左侧布局 private RelativeLayout vgLeft; //右侧(主界面布局) private CustomRelativeLayout vgMain; //页面状态 默认为关闭 private Status status = Status.CLOSE; private final ViewDragHelper.Callback dragHelperCallback = new ViewDragHelper.Callback() {@Overridepublic int clampViewPositionHorizontal(View child, int left, int dx) { if (mainLeft + dx < 0) {return 0; } else if (mainLeft + dx > range) {return range; } else {return left; }}@Overridepublic boolean tryCaptureView(View child, int pointerId) { return true;}@Overridepublic int getViewHorizontalDragRange(View child) { return width;}@Overridepublic void onViewReleased(View releasedChild, float xvel, float yvel) { super.onViewReleased(releasedChild, xvel, yvel); if (xvel > 0) {open(); } else if (xvel < 0) {close(); } else if (releasedChild == vgMain && mainLeft > range * 0.3) {open(); } else if (releasedChild == vgLeft && mainLeft > range * 0.7) {open(); } else {close(); }}@Overridepublic void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) { if (changedView == vgMain) {mainLeft = left; } else {mainLeft = mainLeft + left; } if (mainLeft < 0) {mainLeft = 0; } else if (mainLeft > range) {mainLeft = range; } if (IS_SHOW_SHADOW) {ivShadow.layout(mainLeft, 0, mainLeft + width, height); } if (changedView == vgLeft) {vgLeft.layout(0, 0, width, height);vgMain.layout(mainLeft, 0, mainLeft + width, height); } dispatchDragEvent(mainLeft);} }; public DragLayout(Context context) {this(context, null); } public DragLayout(Context context, AttributeSet attrs) {this(context, attrs, 0);this.context = context; } public DragLayout(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);gestureDetector = new GestureDetectorCompat(context, new YScrollDetector());dragHelper = ViewDragHelper.create(this, dragHelperCallback); } class YScrollDetector extends GestureDetector.SimpleOnGestureListener {@Overridepublic boolean onScroll(MotionEvent e1, MotionEvent e2, float dx, float dy) { return Math.abs(dy) <= Math.abs(dx);} } /*** 滑动相关回调接口*/ public interface DragListener {//界面打开public void onOpen();//界面关闭public void onClose();//界面滑动过程中public void onDrag(float percent); } public void setDragListener(DragListener dragListener) {this.dragListener = dragListener; } /*** 布局加载完成回调* 做一些初始化的操作*/ @Override protected void onFinishInflate() {super.onFinishInflate();if (IS_SHOW_SHADOW) { ivShadow = new ImageView(context); ivShadow.setImageResource(R.mipmap.shadow); LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); addView(ivShadow, 1, lp);}//左侧界面vgLeft = (RelativeLayout) getChildAt(0);//右侧(主)界面vgMain = (CustomRelativeLayout) getChildAt(IS_SHOW_SHADOW ? 2 : 1);vgMain.setDragLayout(this);vgLeft.setClickable(true);vgMain.setClickable(true); } public ViewGroup getVgMain() {return vgMain; } public ViewGroup getVgLeft() {return vgLeft; } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) {super.onSizeChanged(w, h, oldw, oldh);width = vgLeft.getMeasuredWidth();height = vgLeft.getMeasuredHeight();//可以水平拖拽滑动的距离 一共为屏幕宽度的80%range = (int) (width * 0.8f); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) {vgLeft.layout(0, 0, width, height);vgMain.layout(mainLeft, 0, mainLeft + width, height); } /*** 拦截触摸事件* @param ev* @return*/ @Override public boolean onInterceptTouchEvent(MotionEvent ev) {return dragHelper.shouldInterceptTouchEvent(ev) && gestureDetector.onTouchEvent(ev); } /*** 将拦截的到事件给ViewDragHelper进行处理* @param e* @return*/ @Override public boolean onTouchEvent(MotionEvent e) {try { dragHelper.processTouchEvent(e);} catch (Exception ex) { ex.printStackTrace();}return false; } /*** 进行处理拖拽事件* @param mainLeft*/ private void dispatchDragEvent(int mainLeft) {if (dragListener == null) { return;}float percent = mainLeft / (float) range;//滑动动画效果animateView(percent);//进行回调滑动的百分比dragListener.onDrag(percent);Status lastStatus = status;if (lastStatus != getStatus() && status == Status.CLOSE) { dragListener.onClose();} else if (lastStatus != getStatus() && status == Status.OPEN) { dragListener.onOpen();} } /*** 根据滑动的距离的比例,进行平移动画* @param percent*/ private void animateView(float percent) {float f1 = 1 - percent * 0.5f;ViewHelper.setTranslationX(vgLeft, -vgLeft.getWidth() / 2.5f + vgLeft.getWidth() / 2.5f * percent);if (IS_SHOW_SHADOW) { //阴影效果视图大小进行缩放 ViewHelper.setScaleX(ivShadow, f1 * 1.2f * (1 - percent * 0.10f)); ViewHelper.setScaleY(ivShadow, f1 * 1.85f * (1 - percent * 0.10f));} } /*** 有加速度,当我们停止滑动的时候,该不会立即停止动画效果*/ @Override public void computeScroll() {if (dragHelper.continueSettling(true)) { ViewCompat.postInvalidateOnAnimation(this);} } /*** 页面状态(滑动,打开,关闭)*/ public enum Status {DRAG, OPEN, CLOSE } /*** 页面状态设置* @return*/ public Status getStatus() {if (mainLeft == 0) { status = Status.CLOSE;} else if (mainLeft == range) { status = Status.OPEN;} else { status = Status.DRAG;}return status; } public void open() {open(true); } public void open(boolean animate) {if (animate) { //继续滑动 if (dragHelper.smoothSlideViewTo(vgMain, range, 0)) {ViewCompat.postInvalidateOnAnimation(this); }} else { vgMain.layout(range, 0, range * 2, height); dispatchDragEvent(range);} } public void close() {close(true); } public void close(boolean animate) {if (animate) { //继续滑动 if (dragHelper.smoothSlideViewTo(vgMain, 0, 0)) {ViewCompat.postInvalidateOnAnimation(this); }} else { vgMain.layout(0, 0, width, height); dispatchDragEvent(0);} }}CustomRelativeLayout:
public class CustomRelativeLayout extends RelativeLayout { private DragLayout dl; public CustomRelativeLayout(Context context) {super(context); } public CustomRelativeLayout(Context context, AttributeSet attrs) {super(context, attrs); } public CustomRelativeLayout(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr); } public void setDragLayout(DragLayout dl) {this.dl = dl; } @Override public boolean onInterceptTouchEvent(MotionEvent event) {if (dl.getStatus() != DragLayout.Status.CLOSE) { return true;}return super.onInterceptTouchEvent(event); } @Override public boolean onTouchEvent(MotionEvent event) {if (dl.getStatus() != DragLayout.Status.CLOSE) { if (event.getAction() == MotionEvent.ACTION_UP) {dl.close(); } return true;}return super.onTouchEvent(event); }}c沉浸式状态栏:BaseActivity:
public class BaseActivity extends FragmentActivity { @Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);this.requestWindowFeature(Window.FEATURE_NO_TITLE);if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { //透明状态栏 getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS); //透明导航栏 getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);} } /*** 设置沉浸式状态栏*/ protected void setStatusBar() {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { final ViewGroup linear_bar = (ViewGroup) findViewById(R.id.rl_title); final int statusHeight = getStatusBarHeight(); linear_bar.post(new Runnable() {@Overridepublic void run() { int titleHeight = linear_bar.getHeight(); android.widget.LinearLayout.LayoutParams params = (android.widget.LinearLayout.LayoutParams) linear_bar.getLayoutParams(); params.height = statusHeight + titleHeight; linear_bar.setLayoutParams(params);} });} } /*** 获取状态栏的高度* @return*/ protected int getStatusBarHeight(){try{ Class<?> c=Class.forName("com.android.internal.R$dimen"); Object obj=c.newInstance(); Field field=c.getField("status_bar_height"); int x=Integer.parseInt(field.get(obj).toString()); return getResources().getDimensionPixelSize(x);}catch(Exception e){ e.printStackTrace();}return 0; }}MainActivity:
public class MainActivity extends BaseActivity { private DragLayout dl; private LinearLayout linearLayout; @Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initDragLayout(); } private void initDragLayout() {dl = (DragLayout) findViewById(R.id.dl);linearLayout =(LinearLayout) findViewById(R.id.aaa);dl.setDragListener(new DragLayout.DragListener() { //界面打开的时候 @Override public void onOpen() { } //界面关闭的时候 @Override public void onClose() { } //界面滑动的时候 @Override public void onDrag(float percent) { }}); }}OneFragment:
public class OneFragment extends Fragment { private View mView; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {if(mView==null){ mView=inflater.inflate(R.layout.one_frag_layout,container,false);}return mView; }}b布局文件:
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:id="@+id/aaa" > <TextViewandroid:text="界面"android:layout_gravity="center"android:layout_width="wrap_content"android:layout_height="wrap_content" /></LinearLayout>one_frag_layout1.xml:
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" > <TextViewandroid:text="主界面"android:layout_gravity="center"android:layout_width="wrap_content"android:layout_height="wrap_content" /></RelativeLayout>activity.main.xml:
<com.包名.myapplication.widget.DragLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/dl" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@android:color/transparent" > <!--下层 左边的布局 这个布局不能省去--> <include layout="@layout/one_frag_layout1"/> <!--上层 右边的主布局--> <com.包名.myapplication.widget.CustomRelativeLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"android:background="#FFFFFF"><LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" ><RelativeLayout android:id="@+id/rl_title" android:layout_width="match_parent" android:layout_height="49dp" android:gravity="bottom" android:background="#2aaced"> <include layout="@layout/one_frag_layout"/></RelativeLayout><!--中间内容后面放入Fragment--><FrameLayout android:layout_width="fill_parent" android:layout_height="fill_parent" > <fragmentandroid:id="@+id/main_info_fragment"class="com.mieasy.myapplication.OneFragment"android:layout_width="fill_parent"android:layout_height="fill_parent"/></FrameLayout></LinearLayout> </com.包名.myapplication.widget.CustomRelativeLayout></com.包名.myapplication.widget.DragLayout>以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。