Java tutorial
/* * Copyright (C) 2013 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package j2w.team.common.widget.swipeRefresh; import android.content.Context; import android.content.res.Resources; import android.content.res.TypedArray; import android.graphics.Canvas; import android.support.v4.view.MotionEventCompat; import android.support.v4.view.ViewCompat; import android.util.AttributeSet; import android.util.DisplayMetrics; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.view.ViewConfiguration; import android.view.ViewGroup; import android.view.animation.AccelerateInterpolator; import android.view.animation.Animation; import android.view.animation.Animation.AnimationListener; import android.view.animation.DecelerateInterpolator; import android.view.animation.Transformation; import android.widget.AbsListView; import j2w.team.R; import j2w.team.common.log.L; import j2w.team.mvp.fragment.J2WIViewPullListFragment; /** * The SwipeRefreshLayout should be used whenever the user can refresh the * contents of a view via a vertical swipe gesture. The activity that * instantiates this view should add an OnRefreshListener to be notified * whenever the swipe to refresh gesture is completed. The SwipeRefreshLayout * will notify the listener each and every time the gesture is completed again; * the listener is responsible for correctly determining when to actually * initiate a refresh of its content. If the listener determines there should * not be a refresh, it must call setRefreshing(false) to cancel any visual * indication of a refresh. If an activity wishes to show just the progress * animation, it should call setRefreshing(true). To disable the gesture and * progress animation, call setEnabled(false) on the view. * * <p> * This layout should be made the parent of the view that will be refreshed as a * result of the gesture and can only support one direct child. This view will * also be made the target of the gesture and will be forced to match both the * width and the height supplied in this layout. The SwipeRefreshLayout does not * provide accessibility events; instead, a menu item must be provided to allow * refresh of the content wherever this gesture is used. * </p> */ public class SwipeRefreshLayout extends ViewGroup { private static final String LOG_TAG = SwipeRefreshLayout.class.getSimpleName(); private static final long RETURN_TO_ORIGINAL_POSITION_TIMEOUT = 300; private static final float ACCELERATE_INTERPOLATION_FACTOR = 1.5f; private static final float DECELERATE_INTERPOLATION_FACTOR = 2f; private static final float PROGRESS_BAR_HEIGHT = 4; private static final float MAX_SWIPE_DISTANCE_FACTOR = .6f; private static final int REFRESH_TRIGGER_DISTANCE = 80; private static final int INVALID_POINTER = -1; private SwipeProgressBar mProgressBar; // the // thing // that // shows // progress // is // going private SwipeProgressBar mProgressBarBottom; private View mTarget; // the // content // that // gets // pulled // down private int mOriginalOffsetTop; private J2WIViewPullListFragment mJ2WPullListFragmentIView; // private OnRefreshListener mRefreshListener; // private OnLoadListener mLoadListener; private int mFrom; private boolean mRefreshing = false; private boolean mLoading = false; private boolean notRefreshing = false; private boolean notLoading = false; private int mTouchSlop; private float mDistanceToTriggerSync = -1; private int mMediumAnimationDuration; private float mFromPercentage = 0; private float mCurrPercentage = 0; private int mProgressBarHeight; private int mCurrentTargetOffsetTop; private float mInitialMotionY; private float mLastMotionY; private boolean mIsBeingDragged; private int mActivePointerId = INVALID_POINTER; // Target is returning to its start offset because it was cancelled or a // refresh was triggered. private boolean mReturningToStart; private final DecelerateInterpolator mDecelerateInterpolator; private final AccelerateInterpolator mAccelerateInterpolator; private static final int[] LAYOUT_ATTRS = new int[] { android.R.attr.enabled }; private Mode mMode = Mode.getDefault(); // ?????????? // Mode.DISABLED???/? private Mode mLastDirection = Mode.DISABLED; private int mDirection = 0; // ???? private float mStartPoint; private boolean up; private boolean down; // ????? private boolean loadNoFull = false; // ?? private final Animation mAnimateToStartPosition = new Animation() { @Override public void applyTransformation(float interpolatedTime, Transformation t) { int targetTop = 0; if (mFrom != mOriginalOffsetTop) { targetTop = (mFrom + (int) ((mOriginalOffsetTop - mFrom) * interpolatedTime)); } int offset = targetTop - mTarget.getTop(); // ????? // final // int // currentTop // = // mTarget.getTop(); // if // (offset // + // currentTop // < // 0) // { // offset // = // 0 // - // currentTop; // } setTargetOffsetTopAndBottom(offset); } }; // ?? private Animation mShrinkTrigger = new Animation() { @Override public void applyTransformation(float interpolatedTime, Transformation t) { float percent = mFromPercentage + ((0 - mFromPercentage) * interpolatedTime); mProgressBar.setTriggerPercentage(percent); } }; // ?? private Animation mShrinkTriggerBottom = new Animation() { @Override public void applyTransformation(float interpolatedTime, Transformation t) { float percent = mFromPercentage + ((0 - mFromPercentage) * interpolatedTime); mProgressBarBottom.setTriggerPercentage(percent); } }; // ???? private final AnimationListener mReturnToStartPositionListener = new BaseAnimationListener() { @Override public void onAnimationEnd(Animation animation) { // Once // the // target // content // has // returned // to // its // start // position, // reset // the // target // offset // to // 0 mCurrentTargetOffsetTop = 0; mLastDirection = Mode.DISABLED; } }; // ?? private final AnimationListener mShrinkAnimationListener = new BaseAnimationListener() { @Override public void onAnimationEnd(Animation animation) { mCurrPercentage = 0; } }; // ??? private final Runnable mReturnToStartPosition = new Runnable() { @Override public void run() { mReturningToStart = true; animateOffsetToStartPosition(mCurrentTargetOffsetTop + getPaddingTop(), mReturnToStartPositionListener); } }; // Cancel the refresh gesture and animate everything back to its original // state. private final Runnable mCancel = new Runnable() { @Override public void run() { mReturningToStart = true; // Timeout // fired // since // the // user // last // moved // their // finger; // animate // the // trigger // to // 0 // and // put // the // target // back // at // its // original // position if (mProgressBar != null || mProgressBarBottom != null) { mFromPercentage = mCurrPercentage; if (mDirection > 0 && ((mMode == Mode.PULL_FROM_START) || (mMode == Mode.BOTH))) { mShrinkTrigger.setDuration(mMediumAnimationDuration); mShrinkTrigger.setAnimationListener(mShrinkAnimationListener); mShrinkTrigger.reset(); mShrinkTrigger.setInterpolator(mDecelerateInterpolator); startAnimation(mShrinkTrigger); } else if (mDirection < 0 && ((mMode == Mode.PULL_FROM_END) || (mMode == Mode.BOTH))) { mShrinkTriggerBottom.setDuration(mMediumAnimationDuration); mShrinkTriggerBottom.setAnimationListener(mShrinkAnimationListener); mShrinkTriggerBottom.reset(); mShrinkTriggerBottom.setInterpolator(mDecelerateInterpolator); startAnimation(mShrinkTriggerBottom); } } mDirection = 0; animateOffsetToStartPosition(mCurrentTargetOffsetTop + getPaddingTop(), mReturnToStartPositionListener); } }; /** * Simple constructor to use when creating a SwipeRefreshLayout from code. * * @param context */ public SwipeRefreshLayout(Context context) { this(context, null); } /** * Constructor that is called when inflating SwipeRefreshLayout from XML. * * @param context * @param attrs */ public SwipeRefreshLayout(Context context, AttributeSet attrs) { super(context, attrs); mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); mMediumAnimationDuration = getResources().getInteger(android.R.integer.config_mediumAnimTime); setWillNotDraw(false); mProgressBar = new SwipeProgressBar(this); mProgressBarBottom = new SwipeProgressBar(this); TypedArray styledAttributes = context.obtainStyledAttributes(attrs, R.styleable.J2WRefreshStyle); int color1 = styledAttributes.getInt(R.styleable.J2WRefreshStyle_loading_color1, 0xB3000000); int color2 = styledAttributes.getInt(R.styleable.J2WRefreshStyle_loading_color2, 0x80000000); int color3 = styledAttributes.getInt(R.styleable.J2WRefreshStyle_loading_color3, 0x4d000000); int color4 = styledAttributes.getInt(R.styleable.J2WRefreshStyle_loading_color4, 0x1a000000); mProgressBar.setColorScheme(color1, color2, color3, color4); mProgressBarBottom.setColorScheme(color1, color2, color3, color4); final DisplayMetrics metrics = getResources().getDisplayMetrics(); mProgressBarHeight = (int) (metrics.density * PROGRESS_BAR_HEIGHT); mDecelerateInterpolator = new DecelerateInterpolator(DECELERATE_INTERPOLATION_FACTOR); mAccelerateInterpolator = new AccelerateInterpolator(ACCELERATE_INTERPOLATION_FACTOR); final TypedArray a = context.obtainStyledAttributes(attrs, LAYOUT_ATTRS); setEnabled(a.getBoolean(0, true)); a.recycle(); } @Override public void onAttachedToWindow() { super.onAttachedToWindow(); removeCallbacks(mCancel); removeCallbacks(mReturnToStartPosition); } @Override public void onDetachedFromWindow() { super.onDetachedFromWindow(); removeCallbacks(mReturnToStartPosition); removeCallbacks(mCancel); } // ? private void animateOffsetToStartPosition(int from, AnimationListener listener) { mFrom = from; mAnimateToStartPosition.reset(); mAnimateToStartPosition.setDuration(mMediumAnimationDuration); mAnimateToStartPosition.setAnimationListener(listener); mAnimateToStartPosition.setInterpolator(mDecelerateInterpolator); mTarget.startAnimation(mAnimateToStartPosition); } /** * Set the listener to be notified when a refresh is triggered via the swipe * gesture. */ public void setJ2WPullListFragmentIView(J2WIViewPullListFragment listener) { this.mJ2WPullListFragmentIView = listener; } // ? private void setTriggerPercentage(float percent) { if (percent == 0f) { mCurrPercentage = 0; return; } mCurrPercentage = percent; if (((mMode == Mode.PULL_FROM_START) || (mMode == Mode.BOTH)) && mLastDirection != Mode.PULL_FROM_END && !mLoading) { mProgressBar.setTriggerPercentage(percent); } else if (((mMode == Mode.PULL_FROM_END) || (mMode == Mode.BOTH)) && mLastDirection != Mode.PULL_FROM_START && !mRefreshing) { mProgressBarBottom.setTriggerPercentage(percent); } } /** * Notify the widget that refresh state has changed. Do not call this when * refresh is triggered by a swipe gesture. * * @param refreshing * Whether or not the view should show refresh progress. */ public void setRefreshing(boolean refreshing) { if (mRefreshing != refreshing) { ensureTarget(); mCurrPercentage = 0; mRefreshing = refreshing; mProgressBarBottom.setTriggerPercentage(0); mProgressBar.setTriggerPercentage(0); if (mRefreshing) { mProgressBar.start(); } else { mLastDirection = Mode.DISABLED; mProgressBar.stop(); } } } public void setLoading(boolean loading) { if (mLoading != loading) { ensureTarget(); mCurrPercentage = 0; mLoading = loading; mProgressBarBottom.setTriggerPercentage(0); mProgressBar.setTriggerPercentage(0); if (mLoading) { mProgressBarBottom.start(); } else { mLastDirection = Mode.DISABLED; mProgressBarBottom.stop(); } } } /** * ? */ public void openRefreshing() { notRefreshing = false; } /** * ? */ public void closeRefreshing() { notRefreshing = true; } /** * ? */ public void openLoading() { notLoading = false; } /** * ? */ public void closeLoading() { notLoading = true; } /** * @deprecated Use {@link #setColorSchemeResources(int, int, int, int)} */ @Deprecated private void setColorScheme(int colorRes1, int colorRes2, int colorRes3, int colorRes4) { setColorSchemeResources(colorRes1, colorRes2, colorRes3, colorRes4); } /** * Set the four colors used in the progress animation from color resources. * The first color will also be the color of the bar that grows in response * to a user swipe gesture. */ public void setTopColor(int colorRes1, int colorRes2, int colorRes3, int colorRes4) { setColorSchemeResources(colorRes1, colorRes2, colorRes3, colorRes4); } public void setBottomColor(int colorRes1, int colorRes2, int colorRes3, int colorRes4) { setColorSchemeResourcesBottom(colorRes1, colorRes2, colorRes3, colorRes4); } public void setColor(int colorRes1, int colorRes2, int colorRes3, int colorRes4) { setColorSchemeResources(colorRes1, colorRes2, colorRes3, colorRes4); setColorSchemeResourcesBottom(colorRes1, colorRes2, colorRes3, colorRes4); } private void setColorSchemeResources(int colorRes1, int colorRes2, int colorRes3, int colorRes4) { final Resources res = getResources(); setColorSchemeColors(res.getColor(colorRes1), res.getColor(colorRes2), res.getColor(colorRes3), res.getColor(colorRes4)); } private void setColorSchemeResourcesBottom(int colorRes1, int colorRes2, int colorRes3, int colorRes4) { final Resources res = getResources(); setColorSchemeColorsBottom(res.getColor(colorRes1), res.getColor(colorRes2), res.getColor(colorRes3), res.getColor(colorRes4)); } /** * Set the four colors used in the progress animation. The first color will * also be the color of the bar that grows in response to a user swipe * gesture. */ private void setColorSchemeColors(int color1, int color2, int color3, int color4) { ensureTarget(); mProgressBar.setColorScheme(color1, color2, color3, color4); } private void setColorSchemeColorsBottom(int color1, int color2, int color3, int color4) { ensureTarget(); mProgressBarBottom.setColorScheme(color1, color2, color3, color4); } /** * @return Whether the SwipeRefreshWidget is actively showing refresh * progress. */ public boolean isRefreshing() { return mRefreshing; } public boolean isLoading() { return mLoading; } private void ensureTarget() { // Don't bother getting the parent height if the parent hasn't been laid // out yet. if (mTarget == null) { if (getChildCount() > 1 && !isInEditMode()) { throw new IllegalStateException("SwipeRefreshLayout can host only one direct child"); } mTarget = getChildAt(0); mOriginalOffsetTop = mTarget.getTop() + getPaddingTop(); } if (mDistanceToTriggerSync == -1) { if (getParent() != null && ((View) getParent()).getHeight() > 0) { final DisplayMetrics metrics = getResources().getDisplayMetrics(); mDistanceToTriggerSync = (int) Math.min( ((View) getParent()).getHeight() * MAX_SWIPE_DISTANCE_FACTOR, REFRESH_TRIGGER_DISTANCE * metrics.density); } } } @Override public void draw(Canvas canvas) { super.draw(canvas); mProgressBar.draw(canvas); mProgressBarBottom.draw(canvas); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { final int width = getMeasuredWidth(); final int height = getMeasuredHeight(); mProgressBar.setBounds(0, 0, width, mProgressBarHeight); if (getChildCount() == 0) { return; } final View child = getChildAt(0); final int childLeft = getPaddingLeft(); final int childTop = mCurrentTargetOffsetTop + getPaddingTop(); final int childWidth = width - getPaddingLeft() - getPaddingRight(); final int childHeight = height - getPaddingTop() - getPaddingBottom(); child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight); mProgressBarBottom.setBounds(0, height - mProgressBarHeight, width, height); } @Override public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); if (getChildCount() > 1 && !isInEditMode()) { throw new IllegalStateException("SwipeRefreshLayout can host only one direct child"); } if (getChildCount() > 0) { getChildAt(0).measure( MeasureSpec.makeMeasureSpec(getMeasuredWidth() - getPaddingLeft() - getPaddingRight(), MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(getMeasuredHeight() - getPaddingTop() - getPaddingBottom(), MeasureSpec.EXACTLY)); } } /** * @return Whether it is possible for the child view of this layout to * scroll up. Override this if the child view is a custom view. */ public boolean canChildScrollUp() { if (android.os.Build.VERSION.SDK_INT < 14) { if (mTarget instanceof AbsListView) { final AbsListView absListView = (AbsListView) mTarget; return absListView.getChildCount() > 0 && (absListView.getFirstVisiblePosition() > 0 || absListView.getChildAt(0).getTop() < absListView.getPaddingTop()); } else { return mTarget.getScrollY() > 0; } } else { return ViewCompat.canScrollVertically(mTarget, -1); } } public boolean canChildScrollDown() { if (android.os.Build.VERSION.SDK_INT < 14) { if (mTarget instanceof AbsListView) { final AbsListView absListView = (AbsListView) mTarget; View lastChild = absListView.getChildAt(absListView.getChildCount() - 1); if (lastChild != null) { return (absListView.getLastVisiblePosition() == (absListView.getCount() - 1)) && lastChild.getBottom() > absListView.getPaddingBottom(); } else { return false; } } else { return mTarget.getHeight() - mTarget.getScrollY() > 0; } } else { return ViewCompat.canScrollVertically(mTarget, 1); } } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { if (mRefreshing || mLoading) { L.tag("SwipeRefreshLayout"); L.i(""); return false; } ensureTarget(); final int action = MotionEventCompat.getActionMasked(ev); if (mReturningToStart && action == MotionEvent.ACTION_DOWN) { mReturningToStart = false; } if (!isEnabled() || mReturningToStart) { L.tag("SwipeRefreshLayout"); L.i(""); return false; } switch (action) { case MotionEvent.ACTION_DOWN: mLastMotionY = mInitialMotionY = ev.getY(); mActivePointerId = MotionEventCompat.getPointerId(ev, 0); mIsBeingDragged = false; mCurrPercentage = 0; mStartPoint = mInitialMotionY; // up/down???????? // ????canChildScrollUp/canChildScrollDown // ???????? up = canChildScrollUp(); down = canChildScrollDown(); break; case MotionEvent.ACTION_MOVE: if (mActivePointerId == INVALID_POINTER) { L.tag("SwipeRefreshLayout"); L.i("ID"); return false; } final int pointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId); if (pointerIndex < 0) { L.tag("SwipeRefreshLayout"); L.i("ID"); return false; } final float y = MotionEventCompat.getY(ev, pointerIndex); // final float yDiff = y - mInitialMotionY; final float yDiff = y - mStartPoint; // ???? if ((mLastDirection == Mode.PULL_FROM_START && yDiff < 0) || (mLastDirection == Mode.PULL_FROM_END && yDiff > 0)) { L.tag("SwipeRefreshLayout"); L.i("??"); return false; } // ??? // mStartPoint if ((canChildScrollUp() && yDiff > 0) || (canChildScrollDown() && yDiff < 0)) { mStartPoint = y; } // if (yDiff > mTouchSlop) { if (notRefreshing) { L.tag("SwipeRefreshLayout"); L.i("notRefreshing"); return false; } // ??? if (canChildScrollUp() || mLastDirection == Mode.PULL_FROM_END) { mIsBeingDragged = false; return false; } if ((mMode == Mode.PULL_FROM_START) || (mMode == Mode.BOTH)) { mLastMotionY = y; mIsBeingDragged = true; mLastDirection = Mode.PULL_FROM_START; } } // else if (-yDiff > mTouchSlop) { if (notLoading) { L.tag("SwipeRefreshLayout"); L.i("notLoading"); return false; } // ??? if (canChildScrollDown() || mLastDirection == Mode.PULL_FROM_START) { mIsBeingDragged = false; return false; } // ???????? if (!up && !down && !loadNoFull) { mIsBeingDragged = false; return false; } if ((mMode == Mode.PULL_FROM_END) || (mMode == Mode.BOTH)) { mLastMotionY = y; mIsBeingDragged = true; mLastDirection = Mode.PULL_FROM_END; } } break; case MotionEventCompat.ACTION_POINTER_UP: onSecondaryPointerUp(ev); break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: mIsBeingDragged = false; mCurrPercentage = 0; mActivePointerId = INVALID_POINTER; mLastDirection = Mode.DISABLED; break; } return mIsBeingDragged; } @Override public void requestDisallowInterceptTouchEvent(boolean b) { // Nope. } @Override public boolean onTouchEvent(MotionEvent ev) { final int action = MotionEventCompat.getActionMasked(ev); if (mReturningToStart && action == MotionEvent.ACTION_DOWN) { mReturningToStart = false; } if (!isEnabled() || mReturningToStart) { return false; } switch (action) { case MotionEvent.ACTION_DOWN: mLastMotionY = mInitialMotionY = ev.getY(); mActivePointerId = MotionEventCompat.getPointerId(ev, 0); mIsBeingDragged = false; mCurrPercentage = 0; mStartPoint = mInitialMotionY; up = canChildScrollUp(); down = canChildScrollDown(); break; case MotionEvent.ACTION_MOVE: final int pointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId); if (pointerIndex < 0) { Log.e(LOG_TAG, "Got ACTION_MOVE event but have an invalid active pointer id."); return false; } final float y = MotionEventCompat.getY(ev, pointerIndex); // final float yDiff = y - mInitialMotionY; final float yDiff = y - mStartPoint; if ((mLastDirection == Mode.PULL_FROM_START && yDiff < 0) || (mLastDirection == Mode.PULL_FROM_END && yDiff > 0)) { return true; } if (!mIsBeingDragged && (yDiff > 0 && mLastDirection == Mode.PULL_FROM_START) || (yDiff < 0 && mLastDirection == Mode.PULL_FROM_END)) { mIsBeingDragged = true; } if (mIsBeingDragged) { // User velocity passed min velocity; trigger a refresh if (yDiff > mDistanceToTriggerSync) { // User movement passed distance; trigger a refresh if (mLastDirection == Mode.PULL_FROM_END) { return true; } if ((mMode == Mode.PULL_FROM_START) || (mMode == Mode.BOTH)) { mLastDirection = Mode.PULL_FROM_START; startRefresh(); } } else if (-yDiff > mDistanceToTriggerSync) { if ((!up && !down && !loadNoFull) || mLastDirection == Mode.PULL_FROM_START) { return true; } if ((mMode == Mode.PULL_FROM_END) || (mMode == Mode.BOTH)) { mLastDirection = Mode.PULL_FROM_END; startLoad(); } } else { if (!up && !down && yDiff < 0 && !loadNoFull) { return true; } // ??? setTriggerPercentage( mAccelerateInterpolator.getInterpolation(Math.abs(yDiff) / mDistanceToTriggerSync)); updateContentOffsetTop((int) yDiff); if (mTarget.getTop() == getPaddingTop()) { removeCallbacks(mCancel); mLastDirection = Mode.DISABLED; } else { mDirection = (yDiff > 0 ? 1 : -1); updatePositionTimeout(); } } mLastMotionY = y; } break; case MotionEventCompat.ACTION_POINTER_DOWN: { final int index = MotionEventCompat.getActionIndex(ev); mLastMotionY = MotionEventCompat.getY(ev, index); mActivePointerId = MotionEventCompat.getPointerId(ev, index); break; } case MotionEventCompat.ACTION_POINTER_UP: onSecondaryPointerUp(ev); break; case MotionEvent.ACTION_UP: mProgressBarBottom.setTriggerPercentage(0); mProgressBar.setTriggerPercentage(0); case MotionEvent.ACTION_CANCEL: mIsBeingDragged = false; mCurrPercentage = 0; mActivePointerId = INVALID_POINTER; mLastDirection = Mode.DISABLED; return false; } return true; } private void startRefresh() { if (!mLoading && !mRefreshing) { removeCallbacks(mCancel); mReturnToStartPosition.run(); setRefreshing(true); mJ2WPullListFragmentIView.onRefresh(); } } private void startLoad() { if (!mLoading && !mRefreshing) { removeCallbacks(mCancel); mReturnToStartPosition.run(); setLoading(true); mJ2WPullListFragmentIView.onLoad(); } } // ?? private void updateContentOffsetTop(int targetTop) { final int currentTop = mTarget.getTop(); if (targetTop > mDistanceToTriggerSync) { targetTop = (int) mDistanceToTriggerSync; } // ??? // else if (targetTop < 0) { // targetTop = 0; // } setTargetOffsetTopAndBottom(targetTop - currentTop); } // ????? private void setTargetOffsetTopAndBottom(int offset) { mTarget.offsetTopAndBottom(offset); mCurrentTargetOffsetTop = mTarget.getTop(); } private void updatePositionTimeout() { removeCallbacks(mCancel); postDelayed(mCancel, RETURN_TO_ORIGINAL_POSITION_TIMEOUT); } private void onSecondaryPointerUp(MotionEvent ev) { final int pointerIndex = MotionEventCompat.getActionIndex(ev); final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex); if (pointerId == mActivePointerId) { // This was our active pointer going up. Choose a new // active pointer and adjust accordingly. final int newPointerIndex = pointerIndex == 0 ? 1 : 0; mLastMotionY = MotionEventCompat.getY(ev, newPointerIndex); mActivePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex); } } /** * Classes that wish to be notified when the swipe gesture correctly * triggers a refresh should implement this interface. */ // public interface OnRefreshListener { // public void onRefresh(); // } // // public interface OnLoadListener { // public void onLoad(); // } public void setMode(Mode mode) { this.mMode = mode; } public void setLoadNoFull(boolean load) { this.loadNoFull = load; } public static enum Mode { /** * Disable all Pull-to-Refresh gesture and Refreshing handling */ DISABLED(0x0), /** * Only allow the user to Pull from the start of the Refreshable View to * refresh. The start is either the Top or Left, depending on the * scrolling direction. */ PULL_FROM_START(0x1), /** * Only allow the user to Pull from the end of the Refreshable View to * refresh. The start is either the Bottom or Right, depending on the * scrolling direction. */ PULL_FROM_END(0x2), /** * Allow the user to both Pull from the start, from the end to refresh. */ BOTH(0x3); static Mode getDefault() { return BOTH; } boolean permitsPullToRefresh() { return !(this == DISABLED); } boolean permitsPullFromStart() { return (this == Mode.BOTH || this == Mode.PULL_FROM_START); } boolean permitsPullFromEnd() { return (this == Mode.BOTH || this == Mode.PULL_FROM_END); } private int mIntValue; // The modeInt values need to match those from attrs.xml Mode(int modeInt) { mIntValue = modeInt; } int getIntValue() { return mIntValue; } } /** * Simple AnimationListener to avoid having to implement unneeded methods in * AnimationListeners. */ private class BaseAnimationListener implements AnimationListener { @Override public void onAnimationStart(Animation animation) { } @Override public void onAnimationEnd(Animation animation) { } @Override public void onAnimationRepeat(Animation animation) { } } }