Android JazzyViewPager

package com.itau.jingdong.widgets.jazzviewpager;

import java.util.HashMap;
import java.util.LinkedHashMap;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Camera;
import android.graphics.Color;
import android.graphics.Matrix;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

import com.itau.jingdong.R;
import com.nineoldandroids.view.ViewHelper;

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);
    }

    @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;
    }

}

private JazzyViewPager mViewPager = null;
private static final int MSG_CHANGE_PHOTO = 1;
    /** 图片自动切换时间 */
private static final int PHOTO_CHANGE_TIME = 3000;

    mHandler = new Handler(getMainLooper( )) {

            @Override
            public void handleMessage(Message msg) {
                // TODO Auto-generated method stub
                super.handleMessage(msg);
                switch (msg.what) {
                case MSG_CHANGE_PHOTO:
                    int index = mViewPager.getCurrentItem();
                    if (index == mImageUrls.size() - 1) {
                        index = -1;
                    }
                    mViewPager.setCurrentItem(index + 1);
                    mHandler.sendEmptyMessageDelayed(MSG_CHANGE_PHOTO,
                            PHOTO_CHANGE_TIME);
                }
            }

        };

mHandler.sendEmptyMessageDelayed(MSG_CHANGE_PHOTO, PHOTO_CHANGE_TIME);

    <LinearLayout
        android:id="@+id/index_top_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:background="@drawable/android_title_bg"
        android:gravity="center_vertical"
        android:orientation="horizontal" >

        <ImageView
            android:id="@+id/index_top_logo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_margin="5dp"
            android:src="@drawable/home_logo" />

        <EditText
            android:id="@+id/index_search_edit"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            android:layout_weight="1"
            android:background="@drawable/search_box"
            android:drawableRight="@drawable/app_icon_voice"
            android:hint="@string/index_search_edit_hint"
            android:padding="6dp"
            android:textColor="@color/darkgray"
            android:textSize="@dimen/micro_text_size" />

        <ImageButton
            android:id="@+id/index_search_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="5dp"
            android:background="@drawable/app_home_title_r_button_selector"
            android:paddingLeft="10dp"
            android:paddingRight="10dp"
            android:src="@drawable/android_search_button_icon" />
    </LinearLayout>