Android PullToZoomListView to enlarge the rebound effect and android rebound effect

Android PullToZoomListView to enlarge the rebound effect and android rebound effect
Version: 1.0 Date: 2014.8.4 copyright:©2014 kince reprinted to indicate the source
I have read an article previously. The link is: ListView: PullToZoomInListView that can zoom in and out HeaderView from the drop-down list. This is about PullToZoomListView, but there is a need for an error in this article, that is, the PullToZoomListView control is an open-source project on github. However, the most beautiful application is not to use this open-source project, but to decompile the code of the most beautiful application. However, there is a problem with the Code. When the finger slides on the screen, the onItemClick event is triggered. After reading its code, it is found that the onItemClick event is consumed because the return is true in MotionEvent. ACTION_MOVE of the onTouchEvent () method. After that, I decomcompiled the most beautiful application and looked at the implementation of this control. I found other problems, such as missing some variables and not rewriting the onInterceptTouchEvent () method, therefore, I have enriched the control by myself, so that it can be used as close as possible to the original code. The modified code is as follows:

package com.kince.android.pulltozoomlistview;import android.app.Activity;import android.content.Context;import android.os.SystemClock;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.util.Log;import android.view.MotionEvent;import android.view.ViewGroup;import android.view.animation.Interpolator;import android.widget.AbsListView;import android.widget.FrameLayout;import android.widget.ImageView;import android.widget.ListView;public class PullToZoomListView extends ListView implementsAbsListView.OnScrollListener {private static final int INVALID_VALUE = -1;private static final String TAG = "PullToZoomListView";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)));}};int mActivePointerId = -1;private FrameLayout mHeaderContainer;private int mHeaderHeight;private ImageView mHeaderImage;float mLastMotionY = -1.0F;float mLastScale = -1.0F;float mMaxScale = -1.0F;private AbsListView.OnScrollListener mOnScrollListener;private ScalingRunnalable mScalingRunnalable;private int mScreenHeight;private ImageView mShadow;private boolean mScrollable = true;private boolean mShowHeaderImage = true;private boolean mZoomable = true;public PullToZoomListView(Context paramContext) {super(paramContext);init(paramContext);}public PullToZoomListView(Context paramContext,AttributeSet paramAttributeSet) {super(paramContext, paramAttributeSet);init(paramContext);}public PullToZoomListView(Context paramContext,AttributeSet paramAttributeSet, int paramInt) {super(paramContext, paramAttributeSet, paramInt);init(paramContext);}private void endScraling() {if (this.mHeaderContainer.getBottom() >= this.mHeaderHeight)Log.d("mmm", "endScraling");this.mScalingRunnalable.startAnimation(200L);}private void init(Context paramContext) {DisplayMetrics localDisplayMetrics = new DisplayMetrics();((Activity) paramContext).getWindowManager().getDefaultDisplay().getMetrics(localDisplayMetrics);this.mScreenHeight = localDisplayMetrics.heightPixels;this.mHeaderContainer = new FrameLayout(paramContext);this.mHeaderImage = new ImageView(paramContext);int i = localDisplayMetrics.widthPixels;setHeaderViewSize(i, (int) (9.0F * (i / 16.0F)));this.mShadow = new ImageView(paramContext);FrameLayout.LayoutParams localLayoutParams = new FrameLayout.LayoutParams(-1, -2);localLayoutParams.gravity = 80;this.mShadow.setLayoutParams(localLayoutParams);this.mHeaderContainer.addView(this.mHeaderImage);this.mHeaderContainer.addView(this.mShadow);addHeaderView(this.mHeaderContainer);this.mScalingRunnalable = new ScalingRunnalable();super.setOnScrollListener(this);}private void onSecondaryPointerUp(MotionEvent paramMotionEvent) {int i = (paramMotionEvent.getAction()) >> 8;Log.d("onSecondaryPointerUp", i + "");if (paramMotionEvent.getPointerId(i) == this.mActivePointerId)if (i != 0) {this.mLastMotionY = paramMotionEvent.getY(1);this.mActivePointerId = paramMotionEvent.getPointerId(0);return;}}private void reset() {this.mActivePointerId = -1;this.mLastMotionY = -1.0F;this.mMaxScale = -1.0F;this.mLastScale = -1.0F;}public ImageView getHeaderView() {return this.mHeaderImage;}public void hideHeaderImage() {this.mShowHeaderImage = false;this.mZoomable = false;this.mScrollable = false;removeHeaderView(this.mHeaderContainer);}public boolean isScrollable() {return this.mScrollable;}public boolean isZoomable() {return this.mZoomable;}public boolean onInterceptTouchEvent(MotionEvent paramMotionEvent) {if (!this.mZoomable) {return super.onInterceptTouchEvent(paramMotionEvent);}switch (paramMotionEvent.getAction() & MotionEvent.ACTION_MASK) {case MotionEvent.ACTION_DOWN:this.mActivePointerId = paramMotionEvent.getPointerId(0);this.mMaxScale = (this.mScreenHeight / this.mHeaderHeight);break;case MotionEvent.ACTION_UP:reset();break;case MotionEvent.ACTION_POINTER_DOWN:this.mActivePointerId = paramMotionEvent.getPointerId(paramMotionEvent.getActionIndex());break;case MotionEvent.ACTION_POINTER_UP:onSecondaryPointerUp(paramMotionEvent);break;}return super.onInterceptTouchEvent(paramMotionEvent);}protected void onLayout(boolean paramBoolean, int paramInt1, int paramInt2,int paramInt3, int paramInt4) {super.onLayout(paramBoolean, paramInt1, paramInt2, paramInt3, paramInt4);if (this.mHeaderHeight == 0)this.mHeaderHeight = this.mHeaderContainer.getHeight();}@Overridepublic void onScroll(AbsListView paramAbsListView, int paramInt1,int paramInt2, int paramInt3) {if (this.mScrollable) {Log.d(TAG, "onScroll");float f = this.mHeaderHeight - this.mHeaderContainer.getBottom();Log.d("onScroll", "f|" + f);if ((f > 0.0F) && (f < this.mHeaderHeight)) {Log.d("onScroll", "1");int i = (int) (0.65D * f);this.mHeaderImage.scrollTo(0, -i);} else if (this.mHeaderImage.getScrollY() != 0) {Log.d("onScroll", "2");this.mHeaderImage.scrollTo(0, 0);}}if (this.mOnScrollListener != null) {this.mOnScrollListener.onScroll(paramAbsListView, paramInt1,paramInt2, paramInt3);}}public void onScrollStateChanged(AbsListView paramAbsListView, int paramInt) {if (this.mOnScrollListener != null)this.mOnScrollListener.onScrollStateChanged(paramAbsListView,paramInt);}public boolean onTouchEvent(MotionEvent ev) {Log.d(TAG, "" + (0xFF & ev.getAction()));if (!this.mZoomable) {Log.i("zoom", "zoom");return super.onTouchEvent(ev);}switch (ev.getAction() & MotionEvent.ACTION_MASK) {case MotionEvent.ACTION_OUTSIDE:case MotionEvent.ACTION_DOWN:if (!this.mScalingRunnalable.mIsFinished) {this.mScalingRunnalable.abortAnimation();}this.mLastMotionY = ev.getY();this.mActivePointerId = ev.getPointerId(0);this.mMaxScale = (this.mScreenHeight / this.mHeaderHeight);this.mLastScale = (this.mHeaderContainer.getBottom() / this.mHeaderHeight);break;case MotionEvent.ACTION_MOVE:Log.d("onTouchEvent", "mActivePointerId" + mActivePointerId);int j = ev.findPointerIndex(this.mActivePointerId);if (j == -1) {Log.e("PullToZoomListView", "Invalid pointerId="+ this.mActivePointerId + " in onTouchEvent");} else {if (this.mLastMotionY == -1.0F)this.mLastMotionY = ev.getY(j);if (this.mHeaderContainer.getBottom() >= this.mHeaderHeight) {ViewGroup.LayoutParams localLayoutParams = this.mHeaderContainer.getLayoutParams();float f = ((ev.getY(j) - this.mLastMotionY + this.mHeaderContainer.getBottom()) / this.mHeaderHeight - this.mLastScale)/ 2.0F + this.mLastScale;if ((this.mLastScale <= 1.0D) && (f < this.mLastScale)) {localLayoutParams.height = this.mHeaderHeight;this.mHeaderContainer.setLayoutParams(localLayoutParams);}this.mLastScale = Math.min(Math.max(f, 1.0F),this.mMaxScale);localLayoutParams.height = ((int) (this.mHeaderHeight * this.mLastScale));if (localLayoutParams.height < this.mScreenHeight)this.mHeaderContainer.setLayoutParams(localLayoutParams);this.mLastMotionY = ev.getY(j);}this.mLastMotionY = ev.getY(j);}break;case MotionEvent.ACTION_UP:reset();endScraling();break;case MotionEvent.ACTION_CANCEL:break;case MotionEvent.ACTION_POINTER_DOWN:int i = ev.getActionIndex();this.mLastMotionY = ev.getY(i);this.mActivePointerId = ev.getPointerId(i);break;case MotionEvent.ACTION_POINTER_UP:onSecondaryPointerUp(ev);this.mLastMotionY = ev.getY(ev.findPointerIndex(this.mActivePointerId));break;}return super.onTouchEvent(ev);}public void setHeaderViewSize(int paramInt1, int paramInt2) {if (!this.mShowHeaderImage) {return;}Object localObject = this.mHeaderContainer.getLayoutParams();if (localObject == null)localObject = new AbsListView.LayoutParams(paramInt1, paramInt2);((ViewGroup.LayoutParams) localObject).width = paramInt1;((ViewGroup.LayoutParams) localObject).height = paramInt2;this.mHeaderContainer.setLayoutParams((ViewGroup.LayoutParams) localObject);this.mHeaderHeight = paramInt2;}public void setOnScrollListener(AbsListView.OnScrollListener paramOnScrollListener) {this.mOnScrollListener = paramOnScrollListener;}public void setScrollable(boolean paramBoolean) {if (!this.mShowHeaderImage) {return;}this.mScrollable = paramBoolean;}public void setShadow(int paramInt) {if (!this.mShowHeaderImage) {return;}this.mShadow.setBackgroundResource(paramInt);}public void setZoomable(boolean paramBoolean) {if (!this.mShowHeaderImage) {return;}this.mZoomable = paramBoolean;}class ScalingRunnalable implements Runnable {long mDuration;boolean mIsFinished = true;float mScale;long mStartTime;ScalingRunnalable() {}public void abortAnimation() {this.mIsFinished = true;}public boolean isFinished() {return this.mIsFinished;}public void run() {float f2;ViewGroup.LayoutParams localLayoutParams;if ((!this.mIsFinished) && (this.mScale > 1.0D)) {float f1 = ((float) SystemClock.currentThreadTimeMillis() - (float) this.mStartTime)/ (float) this.mDuration;f2 = this.mScale - (this.mScale - 1.0F)* PullToZoomListView.sInterpolator.getInterpolation(f1);localLayoutParams = PullToZoomListView.this.mHeaderContainer.getLayoutParams();if (f2 > 1.0F) {Log.d("mmm", "f2>1.0");localLayoutParams.height = PullToZoomListView.this.mHeaderHeight;localLayoutParams.height = ((int) (f2 * PullToZoomListView.this.mHeaderHeight));PullToZoomListView.this.mHeaderContainer.setLayoutParams(localLayoutParams);PullToZoomListView.this.post(this);return;}this.mIsFinished = true;}}public void startAnimation(long paramLong) {this.mStartTime = SystemClock.currentThreadTimeMillis();this.mDuration = paramLong;this.mScale = ((float) (PullToZoomListView.this.mHeaderContainer.getBottom()) / PullToZoomListView.this.mHeaderHeight);this.mIsFinished = false;PullToZoomListView.this.post(this);}}}

For the implementation principle of this control, please refer to the article above, which has been explained in detail. I will not go into details here. The implementation result is as follows: github link: github.


In android, how does one pull the listview out of the range and then has a rebound effect?

Open-source controls available on the Internet: PullToRefreshListView, a pull-down refresh control. Baidu will find it and use it online.
 
How can I achieve the zoom-in and zoom-in effect in the android album and drag to switch the next image?

No source code is provided. If you want to know how to implement it, we suggest looking for two ideas: 1. Reverse the software; 2. Find the control from the Development Kit help.