android高分段进阶攻略(9)——ViewPager补间动画实现京东广告Banner

最近工作较忙,勿发私信,最近看了一篇不错的博客(http://blog.csdn.net/t12x3456/article/details/13290349),使用第三方插件实现京东广告Banner,3D旋转的ViewPager,虽然博主只是讲解了一些简单的nineoldandroids,但是对nineoldandroids这个控件产生了浓厚的兴趣,于是又看了大神任玉刚的详解nineoldandroids(http://blog.csdn.net/singwhatiwanna/article/details/17639987),发现这个第三方控件实在牛逼,于是打算尝试下。还是先上图:

android高分段进阶攻略(9)——ViewPager补间动画实现京东广告Banner

通过反编译京东的apk,看了一遍,京东是如何实现的这个3D旋转动画ViewPager。首先定义布局文件如下:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:orientation="vertical"
    tools:context=".MainActivity" >

        <com.aimn.dviewpager.JazzyViewPager
            android:id="@+id/index_product_images_container"
            android:layout_width="match_parent"
            android:layout_height="125dp"
            android:background="@color/white" >

        </com.aimn.dviewpager.JazzyViewPager>
        <LinearLayout
                android:id="@+id/index_product_images_indicator"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@color/white"
                android:orientation="horizontal" />



</LinearLayout>

布局很简单,自定义了一个名为JazzyViewPager的控件,还有一个LinearLayout。

android高分段进阶攻略(9)——ViewPager补间动画实现京东广告Banner

红色部分就是JazzyViewPager,而下面那个类似于RadioButton的就是LinearLayout。

然后就是去自定义JazzyViewPager,这个JazzyViewPager肯定继承了ViewPager,我把介绍写在注释里面了,大家可以看代码:

public class JazzyViewPager extends ViewPager {
	public static final String TAG = "JazzyViewPager";
	private boolean mEnabled = true;
	private boolean mFadeEnabled = false;
	private boolean mOutlineEnabled = false;
	public static int sOutlineColor = Color.WHITE;
	private TransitionEffect mEffect = TransitionEffect.Standard;
	private HashMap<Integer, Object> mObjs = new LinkedHashMap<Integer, Object>();
	private static final float SCALE_MAX = 0.5f;
	private static final float ZOOM_MAX = 0.5f;
	private static final float ROT_MAX = 15.0f;
	public enum TransitionEffect {
		Standard, Tablet, CubeIn, CubeOut, FlipVertical, FlipHorizontal, Stack, ZoomIn, ZoomOut, RotateUp, RotateDown, Accordion
	}
	public JazzyViewPager(Context context) {
		this(context, null);
	}
//	构造器,构造器就是干了几个事情,一、定义了一个TypedArray,这是什么大家可以百度自定属性,绑定自定义的
//	属性和特效	
	@SuppressWarnings("incomplete-switch")
	public JazzyViewPager(Context context, AttributeSet attrs) {
		super(context, attrs);
		setClipChildren(false);
		TypedArray ta = context.obtainStyledAttributes(attrs,
				R.styleable.JazzyViewPager);
		int effect = ta.getInt(R.styleable.JazzyViewPager_style, 0);
		String[] transitions = getResources().getStringArray(
				R.array.jazzy_effects);
		setTransitionEffect(TransitionEffect.valueOf(transitions[effect]));
		setFadeEnabled(ta.getBoolean(R.styleable.JazzyViewPager_fadeEnabled,
				false));
		setOutlineEnabled(ta.getBoolean(
				R.styleable.JazzyViewPager_outlineEnabled, false));
		setOutlineColor(ta.getColor(R.styleable.JazzyViewPager_outlineColor,
				Color.WHITE));
		switch (mEffect) {
		case Stack:
		case ZoomOut:
			setFadeEnabled(true);
		}
		ta.recycle();
	}

	public void setTransitionEffect(TransitionEffect effect) {
		mEffect = effect;
	}

	public void setPagingEnabled(boolean enabled) {
		mEnabled = enabled;
	}

	public void setFadeEnabled(boolean enabled) {
		mFadeEnabled = enabled;
	}

	public boolean getFadeEnabled() {
		return mFadeEnabled;
	}

	public void setOutlineEnabled(boolean enabled) {
		mOutlineEnabled = enabled;
		wrapWithOutlines();
	}

	public void setOutlineColor(int color) {
		sOutlineColor = color;
	}

	private void wrapWithOutlines() {
		for (int i = 0; i < getChildCount(); i++) {
			View v = getChildAt(i);
			if (!(v instanceof OutlineContainer)) {
				removeView(v);
				super.addView(wrapChild(v), i);
			}
		}
	}

	private View wrapChild(View child) {
		if (!mOutlineEnabled || child instanceof OutlineContainer)
			return child;
		OutlineContainer out = new OutlineContainer(getContext());
		out.setLayoutParams(generateDefaultLayoutParams());
		child.setLayoutParams(new OutlineContainer.LayoutParams(
				LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
		out.addView(child);
		return out;
	}

	public void addView(View child) {
		super.addView(wrapChild(child));
	}

	public void addView(View child, int index) {
		super.addView(wrapChild(child), index);
	}

	public void addView(View child, LayoutParams params) {
		super.addView(wrapChild(child), params);
	}

	public void addView(View child, int width, int height) {
		super.addView(wrapChild(child), width, height);
	}

	public void addView(View child, int index, LayoutParams params) {
		super.addView(wrapChild(child), index, params);
	}

	@Override
	public boolean onInterceptTouchEvent(MotionEvent arg0) {
		return mEnabled ? super.onInterceptTouchEvent(arg0) : false;
	}

	private State mState;
	private int oldPage;

	private View mLeft;
	private View mRight;
	private float mRot;
	private float mTrans;
	private float mScale;

	private enum State {
		IDLE, GOING_LEFT, GOING_RIGHT
	}

	private void logState(View v, String title) {
		Log.v(TAG,
				title + ": ROT (" + ViewHelper.getRotation(v) + ", "
						+ ViewHelper.getRotationX(v) + ", "
						+ ViewHelper.getRotationY(v) + "), TRANS ("
						+ ViewHelper.getTranslationX(v) + ", "
						+ ViewHelper.getTranslationY(v) + "), SCALE ("
						+ ViewHelper.getScaleX(v) + ", "
						+ ViewHelper.getScaleY(v) + "), ALPHA "
						+ ViewHelper.getAlpha(v));
	}

	protected void animateScroll(int position, float positionOffset) {
		if (mState != State.IDLE) {
			mRot = (float) (1 - Math.cos(2 * Math.PI * positionOffset)) / 2 * 30.0f;
			ViewHelper.setRotationY(this, mState == State.GOING_RIGHT ? mRot
					: -mRot);
			ViewHelper.setPivotX(this, getMeasuredWidth() * 0.5f);
			ViewHelper.setPivotY(this, getMeasuredHeight() * 0.5f);
		}
	}

	protected void animateTablet(View left, View right, float positionOffset) {
		if (mState != State.IDLE) {
			if (left != null) {
				mRot = 30.0f * positionOffset;
				mTrans = getOffsetXForRotation(mRot, left.getMeasuredWidth(),
						left.getMeasuredHeight());
				ViewHelper.setPivotX(left, left.getMeasuredWidth() / 2);
				ViewHelper.setPivotY(left, left.getMeasuredHeight() / 2);
				ViewHelper.setTranslationX(left, mTrans);
				ViewHelper.setRotationY(left, mRot);
				logState(left, "Left");
			}
			if (right != null) {
				mRot = -30.0f * (1 - positionOffset);
				mTrans = getOffsetXForRotation(mRot, right.getMeasuredWidth(),
						right.getMeasuredHeight());
				ViewHelper.setPivotX(right, right.getMeasuredWidth() * 0.5f);
				ViewHelper.setPivotY(right, right.getMeasuredHeight() * 0.5f);
				ViewHelper.setTranslationX(right, mTrans);
				ViewHelper.setRotationY(right, mRot);
				logState(right, "Right");
			}
		}
	}

	private void animateCube(View left, View right, float positionOffset,
			boolean in) {
		if (mState != State.IDLE) {
			if (left != null) {
				mRot = (in ? 90.0f : -90.0f) * positionOffset;
				ViewHelper.setPivotX(left, left.getMeasuredWidth());
				ViewHelper.setPivotY(left, left.getMeasuredHeight() * 0.5f);
				ViewHelper.setRotationY(left, mRot);
			}
			if (right != null) {
				mRot = -(in ? 90.0f : -90.0f) * (1 - positionOffset);
				ViewHelper.setPivotX(right, 0);
				ViewHelper.setPivotY(right, right.getMeasuredHeight() * 0.5f);
				ViewHelper.setRotationY(right, mRot);
			}
		}
	}

	private void animateAccordion(View left, View right, float positionOffset) {
		if (mState != State.IDLE) {
			if (left != null) {
				ViewHelper.setPivotX(left, left.getMeasuredWidth());
				ViewHelper.setPivotY(left, 0);
				ViewHelper.setScaleX(left, 1 - positionOffset);
			}
			if (right != null) {
				ViewHelper.setPivotX(right, 0);
				ViewHelper.setPivotY(right, 0);
				ViewHelper.setScaleX(right, positionOffset);
			}
		}
	}

	private void animateZoom(View left, View right, float positionOffset,
			boolean in) {
		if (mState != State.IDLE) {
			if (left != null) {
				mScale = in ? ZOOM_MAX + (1 - ZOOM_MAX) * (1 - positionOffset)
						: 1 + ZOOM_MAX - ZOOM_MAX * (1 - positionOffset);
				ViewHelper.setPivotX(left, left.getMeasuredWidth() * 0.5f);
				ViewHelper.setPivotY(left, left.getMeasuredHeight() * 0.5f);
				ViewHelper.setScaleX(left, mScale);
				ViewHelper.setScaleY(left, mScale);
			}
			if (right != null) {
				mScale = in ? ZOOM_MAX + (1 - ZOOM_MAX) * positionOffset : 1
						+ ZOOM_MAX - ZOOM_MAX * positionOffset;
				ViewHelper.setPivotX(right, right.getMeasuredWidth() * 0.5f);
				ViewHelper.setPivotY(right, right.getMeasuredHeight() * 0.5f);
				ViewHelper.setScaleX(right, mScale);
				ViewHelper.setScaleY(right, mScale);
			}
		}
	}

	private void animateRotate(View left, View right, float positionOffset,
			boolean up) {
		if (mState != State.IDLE) {
			if (left != null) {
				mRot = (up ? 1 : -1) * (ROT_MAX * positionOffset);
				mTrans = (up ? -1 : 1)
						* (float) (getMeasuredHeight() - getMeasuredHeight()
								* Math.cos(mRot * Math.PI / 180.0f));
				ViewHelper.setPivotX(left, left.getMeasuredWidth() * 0.5f);
				ViewHelper.setPivotY(left, up ? 0 : left.getMeasuredHeight());
				ViewHelper.setTranslationY(left, mTrans);
				ViewHelper.setRotation(left, mRot);
			}
			if (right != null) {
				mRot = (up ? 1 : -1) * (-ROT_MAX + ROT_MAX * positionOffset);
				mTrans = (up ? -1 : 1)
						* (float) (getMeasuredHeight() - getMeasuredHeight()
								* Math.cos(mRot * Math.PI / 180.0f));
				ViewHelper.setPivotX(right, right.getMeasuredWidth() * 0.5f);
				ViewHelper.setPivotY(right, up ? 0 : right.getMeasuredHeight());
				ViewHelper.setTranslationY(right, mTrans);
				ViewHelper.setRotation(right, mRot);
			}
		}
	}

	private void animateFlipHorizontal(View left, View right,
			float positionOffset, int positionOffsetPixels) {
		if (mState != State.IDLE) {
			if (left != null) {
				mRot = 180.0f * positionOffset;
				if (mRot > 90.0f) {
					left.setVisibility(View.INVISIBLE);
				} else {
					if (left.getVisibility() == View.INVISIBLE)
						left.setVisibility(View.VISIBLE);
					mTrans = positionOffsetPixels;
					ViewHelper.setPivotX(left, left.getMeasuredWidth() * 0.5f);
					ViewHelper.setPivotY(left, left.getMeasuredHeight() * 0.5f);
					ViewHelper.setTranslationX(left, mTrans);
					ViewHelper.setRotationY(left, mRot);
				}
			}
			if (right != null) {
				mRot = -180.0f * (1 - positionOffset);
				if (mRot < -90.0f) {
					right.setVisibility(View.INVISIBLE);
				} else {
					if (right.getVisibility() == View.INVISIBLE)
						right.setVisibility(View.VISIBLE);
					mTrans = -getWidth() - getPageMargin()
							+ positionOffsetPixels;
					ViewHelper
							.setPivotX(right, right.getMeasuredWidth() * 0.5f);
					ViewHelper.setPivotY(right,
							right.getMeasuredHeight() * 0.5f);
					ViewHelper.setTranslationX(right, mTrans);
					ViewHelper.setRotationY(right, mRot);
				}
			}
		}
	}

	private void animateFlipVertical(View left, View right,
			float positionOffset, int positionOffsetPixels) {
		if (mState != State.IDLE) {
			if (left != null) {
				mRot = 180.0f * positionOffset;
				if (mRot > 90.0f) {
					left.setVisibility(View.INVISIBLE);
				} else {
					if (left.getVisibility() == View.INVISIBLE)
						left.setVisibility(View.VISIBLE);
					mTrans = positionOffsetPixels;
					ViewHelper.setPivotX(left, left.getMeasuredWidth() * 0.5f);
					ViewHelper.setPivotY(left, left.getMeasuredHeight() * 0.5f);
					ViewHelper.setTranslationX(left, mTrans);
					ViewHelper.setRotationX(left, mRot);
				}
			}
			if (right != null) {
				mRot = -180.0f * (1 - positionOffset);
				if (mRot < -90.0f) {
					right.setVisibility(View.INVISIBLE);
				} else {
					if (right.getVisibility() == View.INVISIBLE)
						right.setVisibility(View.VISIBLE);
					mTrans = -getWidth() - getPageMargin()
							+ positionOffsetPixels;
					ViewHelper
							.setPivotX(right, right.getMeasuredWidth() * 0.5f);
					ViewHelper.setPivotY(right,
							right.getMeasuredHeight() * 0.5f);
					ViewHelper.setTranslationX(right, mTrans);
					ViewHelper.setRotationX(right, mRot);
				}
			}
		}
	}

	protected void animateStack(View left, View right, float positionOffset,
			int positionOffsetPixels) {
		if (mState != State.IDLE) {
			if (right != null) {
				mScale = (1 - SCALE_MAX) * positionOffset + SCALE_MAX;
				mTrans = -getWidth() - getPageMargin() + positionOffsetPixels;
				ViewHelper.setScaleX(right, mScale);
				ViewHelper.setScaleY(right, mScale);
				ViewHelper.setTranslationX(right, mTrans);
			}
			if (left != null) {
				left.bringToFront();
			}
		}
	}

	private Matrix mMatrix = new Matrix();
	private Camera mCamera = new Camera();
	private float[] mTempFloat2 = new float[2];

	protected float getOffsetXForRotation(float degrees, int width, int height) {
		mMatrix.reset();
		mCamera.save();
		mCamera.rotateY(Math.abs(degrees));
		mCamera.getMatrix(mMatrix);
		mCamera.restore();

		mMatrix.preTranslate(-width * 0.5f, -height * 0.5f);
		mMatrix.postTranslate(width * 0.5f, height * 0.5f);
		mTempFloat2[0] = width;
		mTempFloat2[1] = height;
		mMatrix.mapPoints(mTempFloat2);
		return (width - mTempFloat2[0]) * (degrees > 0.0f ? 1.0f : -1.0f);
	}

	protected void animateFade(View left, View right, float positionOffset) {
		if (left != null) {
			ViewHelper.setAlpha(left, 1 - positionOffset);
		}
		if (right != null) {
			ViewHelper.setAlpha(right, positionOffset);
		}
	}

	protected void animateOutline(View left, View right) {
		if (!(left instanceof OutlineContainer))
			return;
		if (mState != State.IDLE) {
			if (left != null) {
				((OutlineContainer) left).setOutlineAlpha(1.0f);
			}
			if (right != null) {
				((OutlineContainer) right).setOutlineAlpha(1.0f);
			}
		} else {
			if (left != null)
				((OutlineContainer) left).start();
			if (right != null)
				((OutlineContainer) right).start();
		}
	}

	@Override
	public void onPageScrolled(int position, float positionOffset,
			int positionOffsetPixels) {
		if (mState == State.IDLE && positionOffset > 0) {
			oldPage = getCurrentItem();
			mState = position == oldPage ? State.GOING_RIGHT : State.GOING_LEFT;
		}
		boolean goingRight = position == oldPage;
		if (mState == State.GOING_RIGHT && !goingRight)
			mState = State.GOING_LEFT;
		else if (mState == State.GOING_LEFT && goingRight)
			mState = State.GOING_RIGHT;

		float effectOffset = isSmall(positionOffset) ? 0 : positionOffset;

		// mLeft = getChildAt(position);
		// mRight = getChildAt(position+1);
		mLeft = findViewFromObject(position);
		mRight = findViewFromObject(position + 1);

		if (mFadeEnabled)
			animateFade(mLeft, mRight, effectOffset);
		if (mOutlineEnabled)
			animateOutline(mLeft, mRight);

		switch (mEffect) {
		case Standard:
			break;
		case Tablet:
			animateTablet(mLeft, mRight, effectOffset);
			break;
		case CubeIn:
			animateCube(mLeft, mRight, effectOffset, true);
			break;
		case CubeOut:
			animateCube(mLeft, mRight, effectOffset, false);
			break;
		case FlipVertical:
			animateFlipVertical(mLeft, mRight, positionOffset,
					positionOffsetPixels);
			break;
		case FlipHorizontal:
			animateFlipHorizontal(mLeft, mRight, effectOffset,
					positionOffsetPixels);
		case Stack:
			animateStack(mLeft, mRight, effectOffset, positionOffsetPixels);
			break;
		case ZoomIn:
			animateZoom(mLeft, mRight, effectOffset, true);
			break;
		case ZoomOut:
			animateZoom(mLeft, mRight, effectOffset, false);
			break;
		case RotateUp:
			animateRotate(mLeft, mRight, effectOffset, true);
			break;
		case RotateDown:
			animateRotate(mLeft, mRight, effectOffset, false);
			break;
		case Accordion:
			animateAccordion(mLeft, mRight, effectOffset);
			break;
		}

		super.onPageScrolled(position, positionOffset, positionOffsetPixels);

		if (effectOffset == 0) {
			mState = State.IDLE;
		}

	}

	private boolean isSmall(float positionOffset) {
		return Math.abs(positionOffset) < 0.0001;
	}

	public void setObjectForPosition(Object obj, int position) {
		mObjs.put(Integer.valueOf(position), obj);
	}

	public View findViewFromObject(int position) {
		Object o = mObjs.get(Integer.valueOf(position));
		if (o == null) {
			return null;
		}
		PagerAdapter a = getAdapter();
		View v;
		for (int i = 0; i < getChildCount(); i++) {
			v = getChildAt(i);
			if (a.isViewFromObject(v, o))
				return v;
		}
		return null;
	}

}
代码中通过ViewHelper去画出了许多动画,而这个ViewHelper就是nineoldandroids第三方提供的,然后再复写viewpager的onPagerSocller方法去实现ViewPager在滑动或者替换的时候的动画效果。其中还有个OutlineContainer,其实我也没搞懂,为啥要通过这个外线容器去画,望大神指导下OutlineContainer的作用。

public class OutlineContainer extends FrameLayout implements Animatable {

	private Paint mOutlinePaint;

	private boolean mIsRunning = false;
	private long mStartTime;
	private float mAlpha = 1.0f;
	private static final long ANIMATION_DURATION = 500;
	private static final long FRAME_DURATION = 1000 / 60;
	private final Interpolator mInterpolator = new Interpolator() {
		public float getInterpolation(float t) {
			t -= 1.0f;
			return t * t * t + 1.0f;
		}
	};

	public OutlineContainer(Context context) {
		super(context);
		init();
	}

	public OutlineContainer(Context context, AttributeSet attrs) {
		super(context, attrs);
		init();
	}

	public OutlineContainer(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		init();
	}

	private void init() {
		mOutlinePaint = new Paint();
		mOutlinePaint.setAntiAlias(true);
		mOutlinePaint.setStrokeWidth(dpToPx(getResources(), 2));
		mOutlinePaint.setColor(getResources().getColor(R.color.blue));
		mOutlinePaint.setStyle(Style.STROKE);

		int padding = dpToPx(getResources(), 10);
		setPadding(padding, padding, padding, padding);
	}

	@Override
	protected void dispatchDraw(Canvas canvas) {
		super.dispatchDraw(canvas);
		int offset = dpToPx(getResources(), 5);
		if (mOutlinePaint.getColor() != JazzyViewPager.sOutlineColor) {
			mOutlinePaint.setColor(JazzyViewPager.sOutlineColor);
		}
		mOutlinePaint.setAlpha((int) (mAlpha * 255));
		Rect rect = new Rect(offset, offset, getMeasuredWidth() - offset,
				getMeasuredHeight() - offset);
		canvas.drawRect(rect, mOutlinePaint);
	}

	public void setOutlineAlpha(float alpha) {
		mAlpha = alpha;
	}

	@Override
	public boolean isRunning() {
		return mIsRunning;
	}

	@Override
	public void start() {
		if (mIsRunning)
			return;
		mIsRunning = true;
		mStartTime = AnimationUtils.currentAnimationTimeMillis();
		post(mUpdater);
	}

	@Override
	public void stop() {
		if (!mIsRunning)
			return;
		mIsRunning = false;
	}

	private final Runnable mUpdater = new Runnable() {
		@Override
		public void run() {
			long now = AnimationUtils.currentAnimationTimeMillis();
			long duration = now - mStartTime;
			if (duration >= ANIMATION_DURATION) {
				mAlpha = 0.0f;
				invalidate();
				stop();
				return;
			} else {
				mAlpha = mInterpolator.getInterpolation(1 - duration
						/ (float) ANIMATION_DURATION);
				invalidate();
			}
			postDelayed(mUpdater, FRAME_DURATION);
		}
	};

	private int dpToPx(Resources res, int dp) {
		return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp,
				res.getDisplayMetrics());
	}
}
定义完以后使用就很简单了,在MainActivtiy里面绑定JazzyViewPager的ID,然后初始化控件,在定义一个handler去定时旋转。

		mViewPager=(JazzyViewPager) findViewById(R.id.index_product_images_container);
		mViewPager.setTransitionEffect(TransitionEffect.CubeOut);
		mViewPager.setCurrentItem(0);
		mHandler.sendEmptyMessageDelayed(MSG_CHANGE_PHOTO, PHOTO_CHANGE_TIME);

		mViewPager.setAdapter(new MyAdapter());
		mViewPager.setOnPageChangeListener(new MyPageChangeListener());
		mViewPager.setOnTouchListener(new OnTouchListener() {

			@Override
			public boolean onTouch(View v, MotionEvent event) {
				// TODO Auto-generated method stub
				if (mImageUrls.size() == 0 || mImageUrls.size() == 1)
					return true;
				else
					return false;
			}
		});
在MyAdapter里面去加载图片,京东的Banner就轻松实现了。

android高分段进阶攻略(9)——ViewPager补间动画实现京东广告Banner,布布扣,bubuko.com

android高分段进阶攻略(9)——ViewPager补间动画实现京东广告Banner

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