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 com.cmad.swipe; import com.example.customswiperefreshlayout.R; 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.text.TextUtils; import android.util.AttributeSet; import android.util.DisplayMetrics; import android.util.Log; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.VelocityTracker; 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.RotateAnimation; import android.view.animation.Transformation; import android.widget.AbsListView; import android.widget.ImageView; import android.widget.ProgressBar; import android.widget.TextView; /** * 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 = 120; private static final int INVALID_POINTER = -1; private SwipeProgressBar mProgressBar; //the thing that shows progress is going private View mTarget; //the content that gets pulled down private int mOriginalOffsetTop; private OnRefreshListener mListener; private OnPullListener mPullListener; private int mFrom; private boolean mRefreshing = false; private int mTouchSlop, maxSlopDistance; 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, speedLimited, alreadyTestSpeed; 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 boolean mCanStartRefresh; private final DecelerateInterpolator mDecelerateInterpolator; private final AccelerateInterpolator mAccelerateInterpolator; private static final int[] LAYOUT_ATTRS = new int[] { android.R.attr.enabled }; private boolean mIsDefaultHeadView = false; private View mHeadView; private ImageView mRefreshImageview; private TextView mRefreshTitle; private TextView mRefreshSubTitle; private ProgressBar mRefreshProgress; private Animation mRotateAnimation; private boolean mIsPulling; private boolean mCanRefreshing; private int mHeadHeight; private boolean mIsShowColorProgressBar = true; private VelocityTracker vTracker = null; // private boolean mIsBootom = true; 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; } if (mRefreshing) { mTarget.setTop(mHeadHeight); mHeadView.setTop(0); mCurrentTargetOffsetTop = mTarget.getTop(); } else { 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 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; } }; 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) { mFromPercentage = mCurrPercentage; mShrinkTrigger.setDuration(mMediumAnimationDuration); mShrinkTrigger.setAnimationListener(mShrinkAnimationListener); mShrinkTrigger.reset(); mShrinkTrigger.setInterpolator(mDecelerateInterpolator); startAnimation(mShrinkTrigger); } 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); 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(); } private void addDefaultHeadView(Context context) { // R.layout mHeadView = LayoutInflater.from(context).inflate(R.layout.pull_to_refresh_header_vertical, null); mRefreshImageview = (ImageView) mHeadView.findViewById(R.id.pull_to_refresh_image); mRefreshTitle = (TextView) mHeadView.findViewById(R.id.pull_to_refresh_text); mRefreshSubTitle = (TextView) mHeadView.findViewById(R.id.pull_to_refresh_sub_text); mRefreshProgress = (ProgressBar) mHeadView.findViewById(R.id.pull_to_refresh_progress); addView(mHeadView, 0); mRotateAnimation = new RotateAnimation(0, -180, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); mRotateAnimation.setDuration(150); mRotateAnimation.setFillAfter(true); mIsDefaultHeadView = true; } public void setRefreshSubText(String text) { if (mRefreshSubTitle != null && !TextUtils.isEmpty(text)) { mRefreshSubTitle.setText(text); } } public void setHeadView(View headView) { if (headView != null) { mHeadView = headView; if (getChildCount() == 2) { removeViewAt(0); } addView(mHeadView, 0); requestLayout(); } } public void hideColorProgressBar() { mIsShowColorProgressBar = false; } @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 setOnRefreshListener(OnRefreshListener listener) { mListener = listener; } public void setOnPullListener(OnPullListener listener) { mPullListener = listener; } private void setTriggerPercentage(float percent) { if (percent == 0f) { // No-op. A null trigger means it's uninitialized, and setting it to zero-percent // means we're trying to reset state, so there's nothing to reset in this case. mCurrPercentage = 0; return; } mCurrPercentage = percent; mProgressBar.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; if (mRefreshing) { mProgressBar.start(); } else { setTargetOffsetTopAndBottom(-mHeadHeight); mProgressBar.stop(); } } } /** * @deprecated Use {@link #setColorSchemeResources(int, int, int, int)} */ @Deprecated public 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 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)); } /** * 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. */ public void setColorSchemeColors(int color1, int color2, int color3, int color4) { ensureTarget(); mProgressBar.setColorScheme(color1, color2, color3, color4); } /** * @return Whether the SwipeRefreshWidget is actively showing refresh * progress. */ public boolean isRefreshing() { return mRefreshing; } public void setMaxSlopDistance(int distance) { maxSlopDistance = distance; } private void ensureTarget() { // Don't bother getting the parent height if the parent hasn't been laid out yet. if (getChildCount() == 1) { addDefaultHeadView(getContext()); } if (mTarget == null) { if (getChildCount() > 2 && !isInEditMode()) { throw new IllegalStateException("SwipeRefreshLayout can host max two direct child"); } mTarget = getChildAt(1); mOriginalOffsetTop = mTarget.getTop() + getPaddingTop(); } if (mHeadView == null) { mHeadView = getChildAt(0); } 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); mDistanceToTriggerSync = mHeadHeight; } } } @Override public void draw(Canvas canvas) { super.draw(canvas); if (mIsShowColorProgressBar) { mProgressBar.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(1); 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); mHeadView.layout(childLeft, childTop - mHeadView.getMeasuredHeight(), childLeft + childWidth, childTop); } @Override public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); if (getChildCount() == 1) { addDefaultHeadView(getContext()); } if (getChildCount() > 2 && !isInEditMode()) { throw new IllegalStateException("SwipeRefreshLayout can host max two direct child"); } if (getChildCount() > 1) { // getChildAt(0).measure( MeasureSpec.makeMeasureSpec(getMeasuredWidth() - getPaddingLeft() - getPaddingRight(), // MeasureSpec.EXACTLY), // MeasureSpec.makeMeasureSpec(100,MeasureSpec.EXACTLY)); if (mHeadView == null) { mHeadView = getChildAt(0); } measureChild(mHeadView, widthMeasureSpec, heightMeasureSpec); mHeadHeight = mHeadView.getMeasuredHeight(); getChildAt(1).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); } } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { ensureTarget(); final int action = MotionEventCompat.getActionMasked(ev); if (mReturningToStart && action == MotionEvent.ACTION_DOWN) { mReturningToStart = false; } if (!isEnabled() || mReturningToStart || canChildScrollUp()) { // Fail fast if we're not in a state where a swipe is possible return false; } switch (action) { case MotionEvent.ACTION_DOWN: mLastMotionY = mInitialMotionY = ev.getY(); mActivePointerId = MotionEventCompat.getPointerId(ev, 0); mIsBeingDragged = false; speedLimited = false; alreadyTestSpeed = false; mCurrPercentage = 0; mIsPulling = false; mCanRefreshing = false; if (vTracker == null) { vTracker = VelocityTracker.obtain(); } else { vTracker.clear(); } vTracker.addMovement(ev); break; case MotionEvent.ACTION_MOVE: if (mActivePointerId == INVALID_POINTER) { Log.e(LOG_TAG, "Got ACTION_MOVE event but don't have an active pointer id."); return false; } 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; } if (!alreadyTestSpeed) { vTracker.addMovement(ev); vTracker.computeCurrentVelocity(1000); if (vTracker.getYVelocity() > 120) { speedLimited = true; return false; } alreadyTestSpeed = true; } else { if (speedLimited) return false; } final float y = MotionEventCompat.getY(ev, pointerIndex); final float yDiff = y - mInitialMotionY; if (yDiff > mTouchSlop) { mLastMotionY = y; mIsBeingDragged = true; } break; case MotionEventCompat.ACTION_POINTER_UP: onSecondaryPointerUp(ev); break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: mIsBeingDragged = false; mCurrPercentage = 0; mActivePointerId = INVALID_POINTER; 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 || canChildScrollUp()) { // Fail fast if we're not in a state where a swipe is possible return false; } switch (action) { case MotionEvent.ACTION_DOWN: mLastMotionY = mInitialMotionY = ev.getY(); mActivePointerId = MotionEventCompat.getPointerId(ev, 0); mIsBeingDragged = false; mCurrPercentage = 0; mIsPulling = false; mCanRefreshing = false; 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; if (!mIsBeingDragged) { mIsBeingDragged = true; } /* if (yDiff> maxSlopDistance){ mIsBeingDragged=false; } */ Log.d(LOG_TAG, "maxSlopDistance:" + maxSlopDistance + " yDiff:" + yDiff); if (mIsBeingDragged && yDiff < maxSlopDistance) { // User velocity passed min velocity; trigger a refresh if (yDiff / 2 > mDistanceToTriggerSync) { // User movement passed distance; trigger a refresh // startRefresh(); mCanStartRefresh = true; } else { mCanStartRefresh = false; } // else { // Just track the user's movement setTriggerPercentage(mAccelerateInterpolator .getInterpolation(yDiff / mDistanceToTriggerSync > 1 ? 1 : yDiff / mDistanceToTriggerSync)); updateContentOffsetTop((int) (yDiff / 2)); if (mLastMotionY > y && mTarget.getTop() == getPaddingTop()) { // If the user puts the view back at the top, we // don't need to. This shouldn't be considered // cancelling the gesture as the user can restart from the top. removeCallbacks(mCancel); } // else { // 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: case MotionEvent.ACTION_CANCEL: if (mCanStartRefresh) { startRefresh(); } else { removeCallbacks(mCancel); post(mCancel); } mIsBeingDragged = false; mCurrPercentage = 0; mActivePointerId = INVALID_POINTER; return false; } return true; } private void startRefresh() { removeCallbacks(mCancel); setDefaultHeadViewRefreshing(); if (!mRefreshing && mListener != null) { mListener.onRefresh(); } if (!mRefreshing && mPullListener != null) { mPullListener.onRefreshing(mHeadView); } setRefreshing(true); mReturnToStartPosition.run(); } private void setDefaultHeadViewRefreshing() { if (mIsDefaultHeadView) { mRefreshImageview.clearAnimation(); mRefreshImageview.setVisibility(View.GONE); mRefreshProgress.setVisibility(View.VISIBLE); mRefreshTitle.setText(getResources().getString(R.string.refreshing)); } } private void updateContentOffsetTop(int targetTop) { final int currentTop = mTarget.getTop(); // if (targetTop > mDistanceToTriggerSync) { // targetTop = (int) mDistanceToTriggerSync; // } else if (targetTop < 0) { targetTop = 0; } if (mIsDefaultHeadView) { mRefreshImageview.setVisibility(View.VISIBLE); mRefreshProgress.setVisibility(View.GONE); } if (currentTop > mDistanceToTriggerSync) { if (!mCanRefreshing && !mRefreshing) { mIsPulling = false; if (mPullListener != null) { mPullListener.onCanRefreshing(mHeadView); } if (mIsDefaultHeadView) { mRefreshImageview.startAnimation(mRotateAnimation); mRefreshTitle.setText(getResources().getString(R.string.loosenToRefresh)); } } mCanRefreshing = true; } else { if (!mIsPulling && !mRefreshing) { mCanRefreshing = false; if (mPullListener != null) { mPullListener.onPulling(mHeadView); } if (mIsDefaultHeadView) { mRefreshImageview.clearAnimation(); mRefreshTitle.setText(getResources().getString(R.string.pullToRefresh)); } } mIsPulling = true; } setTargetOffsetTopAndBottom(targetTop - currentTop); } private void setTargetOffsetTopAndBottom(int offset) { mTarget.offsetTopAndBottom(offset); mHeadView.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(); } /** * 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) { } } }