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package com.ecloud.pulltozoomview; //from w w w . j a v a 2 s . com import android.app.Activity; import android.content.Context; import android.content.res.TypedArray; import android.os.SystemClock; import android.util.AttributeSet; import android.util.DisplayMetrics; import android.util.Log; import android.view.Gravity; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.animation.Interpolator; import android.widget.FrameLayout; import android.widget.LinearLayout; import android.widget.ScrollView; /** * Author: ZhuWenWu * Version V1.0 * Date: 2014/9/1 10:50. * Description: * Modification History: * Date Author Version Description * ----------------------------------------------------------------------------------- * 2014/9/1 ZhuWenWu 1.0 1.0 * Why & What is modified: */ public class PullToZoomScrollView extends ScrollView { private static final String TAG = PullToZoomScrollView.class.getSimpleName(); private static final Interpolator sInterpolator = new Interpolator() { public float getInterpolation(float paramAnonymousFloat) { float f = paramAnonymousFloat - 1.0F; return 1.0F + f * (f * (f * (f * f))); } }; private View mContentView;//??View private View mHeadView;//??View private View mZoomView;//????View private FrameLayout mContentContainer; private FrameLayout mHeaderContainer; private FrameLayout mZoomContainer; private LinearLayout mRootContainer; private OnScrollViewChangedListener mOnScrollListener; private OnScrollViewZoomListener onScrollViewZoomListener; private ScalingRunnable mScalingRunnable; private int mScreenHeight; private int mZoomHeight; private int mZoomWidth; private int mActivePointerId = -1; private float mLastMotionY = -1.0F; private float mLastScale = -1.0F; private float mMaxScale = -1.0F; private boolean isHeaderTop = true; private boolean isEnableZoom = true; private boolean isParallax = false; public PullToZoomScrollView(Context context) { this(context, null); } public PullToZoomScrollView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public PullToZoomScrollView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(attrs); } private void init(AttributeSet attrs) { mHeaderContainer = new FrameLayout(getContext()); mZoomContainer = new FrameLayout(getContext()); mContentContainer = new FrameLayout(getContext()); mRootContainer = new LinearLayout(getContext()); mRootContainer.setOrientation(LinearLayout.VERTICAL); if (attrs != null) { LayoutInflater mLayoutInflater = LayoutInflater.from(getContext()); //???????View TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.PullToZoomScrollView); int zoomViewResId = a.getResourceId(R.styleable.PullToZoomScrollView_scrollZoomView, 0); if (zoomViewResId > 0) { mZoomView = mLayoutInflater.inflate(zoomViewResId, null, false); mZoomContainer.addView(mZoomView); mHeaderContainer.addView(mZoomContainer); } int headViewResId = a.getResourceId(R.styleable.PullToZoomScrollView_scrollHeadView, 0); if (headViewResId > 0) { mHeadView = mLayoutInflater.inflate(headViewResId, null, false); mHeaderContainer.addView(mHeadView); } int contentViewResId = a.getResourceId(R.styleable.PullToZoomScrollView_scrollContentView, 0); if (contentViewResId > 0) { mContentView = mLayoutInflater.inflate(contentViewResId, null, false); mContentContainer.addView(mContentView); } a.recycle(); } DisplayMetrics localDisplayMetrics = new DisplayMetrics(); ((Activity) getContext()).getWindowManager().getDefaultDisplay().getMetrics(localDisplayMetrics); mScreenHeight = localDisplayMetrics.heightPixels; mZoomWidth = localDisplayMetrics.widthPixels; mScalingRunnable = new ScalingRunnable(); mRootContainer.addView(mHeaderContainer); mRootContainer.addView(mContentContainer); mRootContainer.setClipChildren(false); mHeaderContainer.setClipChildren(false); addView(mRootContainer); } @Override protected void onFinishInflate() { super.onFinishInflate(); } public void setEnableZoom(boolean isEnableZoom) { this.isEnableZoom = isEnableZoom; } public void setParallax(boolean isParallax) { this.isParallax = isParallax; } public void setOnScrollListener(OnScrollViewChangedListener mOnScrollListener) { this.mOnScrollListener = mOnScrollListener; } public void setOnScrollViewZoomListener(OnScrollViewZoomListener onScrollViewZoomListener) { this.onScrollViewZoomListener = onScrollViewZoomListener; } public void setContentContainerView(View view) { if (mContentContainer != null) { mContentContainer.removeAllViews(); mContentView = view; mContentContainer.addView(view); } } public void setHeaderContainer(View view) { if (mHeaderContainer != null && view != null) { mHeaderContainer.removeAllViews(); mHeadView = view; if (mZoomView != null && mZoomContainer != null) { mZoomContainer.removeAllViews(); mZoomContainer.addView(mZoomView); mHeaderContainer.addView(mZoomContainer); } mHeaderContainer.addView(mHeadView); } } public void setZoomView(View view) { if (mZoomContainer != null && view != null) { this.mZoomView = view; mZoomContainer.removeAllViews(); mZoomContainer.addView(mZoomView); if (mHeaderContainer != null) { mHeaderContainer.removeAllViews(); mHeaderContainer.addView(mZoomContainer); if (mHeadView != null) { mHeaderContainer.addView(mHeadView); } } } } public void showHeaderView() { if (mZoomView != null || mHeadView != null) { mHeaderContainer.setVisibility(VISIBLE); } } public void hideHeaderView() { if (mZoomView != null || mHeadView != null) { mHeaderContainer.setVisibility(GONE); } } public FrameLayout getZoomContainer() { return mZoomContainer; } public FrameLayout getHeaderContainer() { return mHeaderContainer; } public View getZoomView() { return mZoomView; } public View getContentView() { return mContentView; } public View getHeadView() { return mHeadView; } public void setZoomHeight(int mZoomHeight) { this.mZoomHeight = mZoomHeight; } public LinearLayout getRootContainer() { return mRootContainer; } private void endScaling() { if (mZoomContainer.getBottom() >= mZoomHeight) { Log.d(TAG, "endScaling"); } mScalingRunnable.startAnimation(200L); } public boolean onInterceptTouchEvent(MotionEvent event) { return super.onInterceptTouchEvent(event); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); if (mZoomHeight == 0) { if (mZoomContainer != null) { mZoomHeight = mZoomContainer.getHeight(); mZoomWidth = mZoomContainer.getWidth(); } } } @Override protected void onScrollChanged(int left, int top, int oldLeft, int oldTop) { super.onScrollChanged(left, top, oldLeft, oldTop); if (isEnableZoom) { isHeaderTop = getScrollY() <= 0; Log.d(TAG, "onScrollChanged --> "); if (isParallax) { float f = mZoomHeight - mZoomContainer.getBottom() + getScrollY(); Log.d(TAG, "f = " + f); if ((f > 0.0F) && (f < mZoomHeight)) { int i = (int) (0.65D * f); mHeaderContainer.scrollTo(0, -i); } else if (mHeaderContainer.getScrollY() != 0) { mHeaderContainer.scrollTo(0, 0); } } } if (mOnScrollListener != null) { mOnScrollListener.onScrollChanged(left, top, oldLeft, oldTop); } } @Override public boolean onTouchEvent(MotionEvent ev) { Log.d(TAG, "onTouchEvent --> action = " + (0xFF & ev.getAction())); if (isHeaderTop && isEnableZoom) { switch (0xFF & ev.getAction()) { case MotionEvent.ACTION_DOWN: case MotionEvent.ACTION_OUTSIDE: if (!mScalingRunnable.isFinished()) { mScalingRunnable.abortAnimation(); } mLastMotionY = ev.getY(); mActivePointerId = ev.getPointerId(0); mMaxScale = (mScreenHeight / mZoomHeight); mLastScale = (mZoomContainer.getBottom() / mZoomHeight); if (onScrollViewZoomListener != null) { onScrollViewZoomListener.onStart(); } break; case MotionEvent.ACTION_MOVE: Log.d(TAG, "mActivePointerId = " + mActivePointerId); int j = ev.findPointerIndex(this.mActivePointerId); if (j == -1) { Log.e(TAG, "Invalid pointerId = " + mActivePointerId + " in onTouchEvent"); } else { if (mLastMotionY == -1.0F) { mLastMotionY = ev.getY(j); } if (mZoomContainer.getBottom() >= mZoomHeight) { FrameLayout.LayoutParams localLayoutParams = (FrameLayout.LayoutParams) mZoomContainer.getLayoutParams(); ViewGroup.LayoutParams headLayoutParams = mHeaderContainer.getLayoutParams(); float f = ((ev.getY(j) - mLastMotionY + mZoomContainer.getBottom()) / mZoomHeight - mLastScale) / 2.0F + mLastScale; if ((mLastScale <= 1.0D) && (f < mLastScale)) { localLayoutParams.height = mZoomHeight; localLayoutParams.width = mZoomWidth; localLayoutParams.gravity = Gravity.CENTER; headLayoutParams.height = mZoomHeight; mZoomContainer.setLayoutParams(localLayoutParams); mHeaderContainer.setLayoutParams(headLayoutParams); return super.onTouchEvent(ev); } mLastScale = Math.min(Math.max(f, 1.0F), mMaxScale); localLayoutParams.height = ((int) (mZoomHeight * mLastScale)); localLayoutParams.width = ((int) (mZoomWidth * mLastScale)); localLayoutParams.gravity = Gravity.CENTER; headLayoutParams.height = ((int) (mZoomHeight * mLastScale)); if (localLayoutParams.height < mScreenHeight) { mZoomContainer.setLayoutParams(localLayoutParams); mHeaderContainer.setLayoutParams(headLayoutParams); } mLastMotionY = ev.getY(j); return true; } this.mLastMotionY = ev.getY(j); } break; case MotionEvent.ACTION_UP: reset(); endScaling(); if (onScrollViewZoomListener != null) { onScrollViewZoomListener.onFinish(); } break; case MotionEvent.ACTION_CANCEL: int i = ev.getActionIndex(); mLastMotionY = ev.getY(i); mActivePointerId = ev.getPointerId(i); break; case MotionEvent.ACTION_POINTER_DOWN: onSecondaryPointerUp(ev); mLastMotionY = ev.getY(ev.findPointerIndex(mActivePointerId)); break; } } return super.onTouchEvent(ev); } private void onSecondaryPointerUp(MotionEvent paramMotionEvent) { int i = (paramMotionEvent.getAction()) >> 8; if (paramMotionEvent.getPointerId(i) == mActivePointerId) if (i != 0) { mLastMotionY = paramMotionEvent.getY(0); mActivePointerId = paramMotionEvent.getPointerId(0); } } private void reset() { this.mActivePointerId = -1; this.mLastMotionY = -1.0F; this.mMaxScale = -1.0F; this.mLastScale = -1.0F; } class ScalingRunnable implements Runnable { long mDuration; boolean mIsFinished = true; float mScale; long mStartTime; ScalingRunnable() { } public void abortAnimation() { mIsFinished = true; } public boolean isFinished() { return mIsFinished; } public void run() { float f2; FrameLayout.LayoutParams localLayoutParams; ViewGroup.LayoutParams headLayoutParams; if ((!mIsFinished) && (mScale > 1.0D)) { float f1 = ((float) SystemClock.currentThreadTimeMillis() - (float) mStartTime) / (float) mDuration; f2 = mScale - (mScale - 1.0F) * sInterpolator.getInterpolation(f1); localLayoutParams = (FrameLayout.LayoutParams) mZoomContainer.getLayoutParams(); headLayoutParams = mHeaderContainer.getLayoutParams(); if (f2 > 1.0F) { Log.d(TAG, "f2 > 1.0"); localLayoutParams.height = ((int) (f2 * mZoomHeight)); localLayoutParams.width = ((int) (f2 * mZoomWidth)); localLayoutParams.gravity = Gravity.CENTER; mZoomContainer.setLayoutParams(localLayoutParams); headLayoutParams.height = ((int) (f2 * mZoomHeight)); mHeaderContainer.setLayoutParams(headLayoutParams); post(this); return; } mIsFinished = true; } } public void startAnimation(long paramLong) { mStartTime = SystemClock.currentThreadTimeMillis(); mDuration = paramLong; mScale = ((float) (mZoomContainer.getBottom()) / mZoomHeight); mIsFinished = false; post(this); } } public interface OnScrollViewChangedListener { public void onScrollChanged(int left, int top, int oldLeft, int oldTop); } public interface OnScrollViewZoomListener { public void onStart(); public void onFinish(); } }