仿微信首次启动使用教程滑动开门动画代码,Java代码库,德仔网

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【Java】仿微信首次启动使用教程滑动开门动画
作者:Dezai.CN / 发布于2013/6/17/ 692

	package com.chen.weixin.test;

	import android.R.bool;
	import android.content.Context;
	import android.util.AttributeSet;
	import android.util.Log;
	import android.view.MotionEvent;
	import android.view.VelocityTracker;
	import android.view.View;
	import android.view.ViewConfiguration;
	import android.view.ViewGroup;
	import android.view.View.MeasureSpec;
	import android.widget.Scroller;

	public class MyScrollLayout extends ViewGroup {

	private static final String TAG = "ScrollLayout";

	private VelocityTracker mVelocityTracker; // 用于判断甩动手势

	private static final int SNAP_VELOCITY = 600;

	private Scroller mScroller; // 滑动控制

	private int mCurScreen;

	private int mDefaultScreen = 0;

	private float mLastMotionX;

	// private int mTouchSlop;

	// private static final int TOUCH_STATE_REST = 0;
	// private static final int TOUCH_STATE_SCROLLING = 1;
	// private int mTouchState = TOUCH_STATE_REST;

	private OnViewChangeListener mOnViewChangeListener;

	public MyScrollLayout(Context context) {
	 super(context);
	 // TODO Auto-generated constructor stub
	 init(context);
	}

	public MyScrollLayout(Context context, AttributeSet attrs) {
	 super(context, attrs);
	 // TODO Auto-generated constructor stub
	 init(context);
	}

	public MyScrollLayout(Context context, AttributeSet attrs, int defStyle) {
	 super(context, attrs, defStyle);
	 // TODO Auto-generated constructor stub

	 init(context);
	}

	private void init(Context context) {
	 mCurScreen = mDefaultScreen;

	 // mTouchSlop =
	 // ViewConfiguration.get(getContext()).getScaledTouchSlop();

	 mScroller = new Scroller(context);

	}

	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b) {
	 // TODO Auto-generated method stub

	 if (changed) {
	 int childLeft = 0;
	 final int childCount = getChildCount();

	 for (int i = 0; i < childCount; i++) {
	 final View childView = getChildAt(i);
	 if (childView.getVisibility() != View.GONE) {
	 final int childWidth = childView.getMeasuredWidth();
	 childView.layout(childLeft, 0, childLeft + childWidth,
	 childView.getMeasuredHeight());
	 childLeft += childWidth;
	 }
	 }
	 }
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
	 // TODO Auto-generated method stub
	 super.onMeasure(widthMeasureSpec, heightMeasureSpec);

	 final int width = MeasureSpec.getSize(widthMeasureSpec);
	 final int widthMode = MeasureSpec.getMode(widthMeasureSpec);

	 final int count = getChildCount();
	 for (int i = 0; i < count; i++) {
	 getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec);
	 }

	 scrollTo(mCurScreen * width, 0);

	}

	public void snapToDestination() {
	 final int screenWidth = getWidth();

	 final int destScreen = (getScrollX() + screenWidth / 2) / screenWidth;
	 snapToScreen(destScreen);
	}

	public void snapToScreen(int whichScreen) {

	 // get the valid layout page
	 whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1));
	 if (getScrollX() != (whichScreen * getWidth())) {

	 final int delta = whichScreen * getWidth() - getScrollX();

	 mScroller.startScroll(getScrollX(), 0, delta, 0,
	 Math.abs(delta) * 2);

	 mCurScreen = whichScreen;
	 invalidate(); // Redraw the layout

	 if (mOnViewChangeListener != null) {
	 mOnViewChangeListener.OnViewChange(mCurScreen);
	 }
	 }
	}

	@Override
	public void computeScroll() {
	 // TODO Auto-generated method stub
	 if (mScroller.computeScrollOffset()) {
	 scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
	 postInvalidate();
	 }
	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
	 // TODO Auto-generated method stub

	 final int action = event.getAction();
	 final float x = event.getX();
	 final float y = event.getY();

	 switch (action) {
	 case MotionEvent.ACTION_DOWN:

	 Log.i("", "onTouchEvent ACTION_DOWN");

	 if (mVelocityTracker == null) {
	 mVelocityTracker = VelocityTracker.obtain();
	 mVelocityTracker.addMovement(event);
	 }

	 if (!mScroller.isFinished()) {
	 mScroller.abortAnimation();
	 }

	 mLastMotionX = x;
	 break;

	 case MotionEvent.ACTION_MOVE:
	 int deltaX = (int) (mLastMotionX - x);

	 if (IsCanMove(deltaX)) {
	 if (mVelocityTracker != null) {
	 mVelocityTracker.addMovement(event);
	 }

	 mLastMotionX = x;

	 scrollBy(deltaX, 0);
	 }

	 break;

	 case MotionEvent.ACTION_UP:

	 int velocityX = 0;
	 if (mVelocityTracker != null) {
	 mVelocityTracker.addMovement(event);
	 mVelocityTracker.computeCurrentVelocity(1000);
	 velocityX = (int) mVelocityTracker.getXVelocity();
	 }

	 if (velocityX > SNAP_VELOCITY && mCurScreen > 0) {
	 // Fling enough to move left
	 Log.e(TAG, "snap left");
	 snapToScreen(mCurScreen - 1);
	 } else if (velocityX < -SNAP_VELOCITY
	 && mCurScreen < getChildCount() - 1) {
	 // Fling enough to move right
	 Log.e(TAG, "snap right");
	 snapToScreen(mCurScreen + 1);
	 } else {
	 snapToDestination();
	 }

	 if (mVelocityTracker != null) {
	 mVelocityTracker.recycle();
	 mVelocityTracker = null;
	 }

	 // mTouchState = TOUCH_STATE_REST;
	 break;
	 }

	 return true;
	}

	//
	// public boolean onInterceptTouchEvent(MotionEvent ev) {
	// // TODO Auto-generated method stub
	// final int action = ev.getAction();
	// if ((action == MotionEvent.ACTION_MOVE)
	// && (mTouchState != TOUCH_STATE_REST)) {
	// Log.i("", "onInterceptTouchEvent return true");
	// return true;
	// }
	// final float x = ev.getX();
	// final float y = ev.getY();
	// switch (action) {
	// case MotionEvent.ACTION_MOVE:
	// final int xDiff = (int) Math.abs(mLastMotionX - x);
	// if (xDiff > mTouchSlop) {
	// mTouchState = TOUCH_STATE_SCROLLING;
	// }
	// break;
	//
	// case MotionEvent.ACTION_DOWN:
	// mLastMotionX = x;
	//
	// mTouchState = mScroller.isFinished() ? TOUCH_STATE_REST
	// : TOUCH_STATE_SCROLLING;
	// break;
	//
	// case MotionEvent.ACTION_CANCEL:
	// case MotionEvent.ACTION_UP:
	// mTouchState = TOUCH_STATE_REST;
	// break;
	// }
	//
	// if (mTouchState != TOUCH_STATE_REST)
	// {
	// Log.i("", "mTouchState != TOUCH_STATE_REST return true");
	// }
	//
	//
	// return mTouchState != TOUCH_STATE_REST;
	// }

	private boolean IsCanMove(int deltaX) {

	 if (getScrollX() <= 0 && deltaX < 0) {
	 return false;
	 }

	 if (getScrollX() >= (getChildCount() - 1) * getWidth() && deltaX > 0) {
	 return false;
	 }

	 return true;
	}

	public void SetOnViewChangeListener(OnViewChangeListener listener) {
	 mOnViewChangeListener = listener;
	}

	}
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