ActivitySplitAnimationUtil 打开Activity动画工具类

package com.example.welcome;import android.animation.Animator;import android.animation.AnimatorSet;import android.animation.ObjectAnimator;import android.animation.TimeInterpolator;import android.annotation.SuppressLint;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.PixelFormat;import android.graphics.Rect;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.os.Handler;import android.util.Log;import android.view.Gravity;import android.view.View;import android.view.WindowManager;import android.view.animation.DecelerateInterpolator;import android.widget.ImageView;/** * Utility class to create a split activity animation * * @author Udi Cohen (@udinic) */@SuppressLint("NewApi")public class ActivitySplitAnimationUtil {    public static Bitmap mBitmap = null;    private static int[] mLoc1;    private static int[] mLoc2;    private static ImageView mTopImage;    private static ImageView mBottomImage;    private static AnimatorSet mSetAnim;    /**     * Start a new Activity with a Split animation     *     * @param currActivity The current Activity     * @param intent       The Intent needed tot start the new Activity     * @param splitYCoord  The Y coordinate where we want to split the Activity on the animation. -1 will split the Activity equally     */    public static void startActivity(Activity currActivity, Intent intent, int splitYCoord) {        // Preparing the bitmaps that we need to show        prepare(currActivity, splitYCoord);        currActivity.startActivity(intent);        currActivity.overridePendingTransition(0, 0);    }    /**     * Start a new Activity with a Split animation right in the middle of the Activity     *     * @param currActivity The current Activity     * @param intent       The Intent needed tot start the new Activity     */    public static void startActivity(Activity currActivity, Intent intent) {        startActivity(currActivity, intent, -1);    }    /**     * Preparing the graphics on the destination Activity.     * Should be called on the destination activity on Activity#onCreate() BEFORE setContentView()     *     * @param destActivity the destination Activity     */    public static void prepareAnimation(final Activity destActivity) {        mTopImage = createImageView(destActivity, mBitmap, mLoc1);        mBottomImage = createImageView(destActivity, mBitmap, mLoc2);    }    /**     * Start the animation the reveals the destination Activity     * Should be called on the destination activity on Activity#onCreate() AFTER setContentView()     *     * @param destActivity the destination Activity     * @param duration The duration of the animation     * @param interpolator The interpulator to use for the animation. null for no interpulation.     */    public static void animate(final Activity destActivity, final int duration, final TimeInterpolator interpolator) {        // Post this on the UI thread's message queue. It's needed for the items to be already measured        new Handler().post(new Runnable() {            @Override            public void run() {                mSetAnim = new AnimatorSet();                mTopImage.setLayerType(View.LAYER_TYPE_HARDWARE, null);                mBottomImage.setLayerType(View.LAYER_TYPE_HARDWARE, null);                mSetAnim.addListener(new Animator.AnimatorListener() {                    @Override                    public void onAnimationStart(Animator animation) {                    }                    @Override                    public void onAnimationEnd(Animator animation) {                        clean(destActivity);                    }                    @Override                    public void onAnimationCancel(Animator animation) {                        clean(destActivity);                    }                    @Override                    public void onAnimationRepeat(Animator animation) {                    }                });                // Animating the 2 parts away from each other                Animator anim1 = ObjectAnimator.ofFloat(mTopImage, "translationY", mTopImage.getHeight() * -1);                Animator anim2 = ObjectAnimator.ofFloat(mBottomImage, "translationY", mBottomImage.getHeight());                if (interpolator != null) {                    anim1.setInterpolator(interpolator);                    anim2.setInterpolator(interpolator);                }                mSetAnim.setDuration(duration);                mSetAnim.playTogether(anim1, anim2);                mSetAnim.start();            }        });    }    /**     * Start the animation that reveals the destination Activity     * Should be called on the destination activity on Activity#onCreate() AFTER setContentView()     *     * @param destActivity the destination Activity     * @param duration The duration of the animation     */    public static void animate(final Activity destActivity, final int duration) {        animate(destActivity, duration, new DecelerateInterpolator());    }    /**     * Cancel an in progress animation     */    public static void cancel() {        if (mSetAnim != null)            mSetAnim.cancel();    }    /**     * Clean stuff     *     * @param activity The Activity where the animation is occurring     */    private static void clean(Activity activity) {        if (mTopImage != null) {            mTopImage.setLayerType(View.LAYER_TYPE_NONE, null);            try {                // If we use the regular removeView() we'll get a small UI glitch                activity.getWindowManager().removeViewImmediate(mBottomImage);            } catch (Exception ignored) {            }        }        if (mBottomImage != null) {            mBottomImage.setLayerType(View.LAYER_TYPE_NONE, null);            try {                activity.getWindowManager().removeViewImmediate(mTopImage);            } catch (Exception ignored) {            }        }        mBitmap = null;    }    /**     * Preparing the graphics for the animation     *     * @param currActivity the current Activity from where we start the new one     * @param splitYCoord  The Y coordinate where we want to split the activity. -1 will split the activity equally     */    private static void prepare(Activity currActivity, int splitYCoord) {        // Get the content of the activity and put in a bitmap        View root = currActivity.getWindow().getDecorView().findViewById(android.R.id.content);        root.setDrawingCacheEnabled(true);        mBitmap = root.getDrawingCache();        // If the split Y coordinate is -1 - We'll split the activity equally        splitYCoord = (splitYCoord != -1 ? splitYCoord : mBitmap.getHeight() / 2);        if (splitYCoord > mBitmap.getHeight())            throw new IllegalArgumentException("Split Y coordinate [" + splitYCoord + "] exceeds the activity's height [" + mBitmap.getHeight() + "]");        // Set the location to put the 2 bitmaps on the destination activity        Log.i("prepare", root.getTop()+"");        Log.i("prepare", splitYCoord+"");        mLoc1 = new int[]{0, splitYCoord, root.getTop()};        mLoc2 = new int[]{splitYCoord, mBitmap.getHeight(), root.getTop()};    }    /**     * Creating the an image, containing one part of the animation on the destination activity     *     * @param destActivity The destination activity     * @param bmp          The Bitmap of the part we want to add to the destination activity     * @param loc          The location this part should be on the screen     * @return     */    private static ImageView createImageView(Activity destActivity, Bitmap bmp, int loc[]) {    MyImageView imageView = new MyImageView(destActivity);        imageView.setImageBitmap(bmp);        imageView.setImageOffsets(bmp.getWidth(), loc[0], loc[1]);                                     WindowManager.LayoutParams windowParams = new WindowManager.LayoutParams();        windowParams.gravity = Gravity.TOP;        windowParams.x = 0;        windowParams.y = loc[2] + loc[0];        windowParams.height = loc[1] - loc[0];        windowParams.width = bmp.getWidth();        windowParams.flags = WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;        windowParams.format = PixelFormat.TRANSLUCENT;        windowParams.windowAnimations = 0;        destActivity.getWindowManager().addView(imageView, windowParams);        return imageView;    }        /**     * MyImageView     * Extended ImageView that draws just part of an image, base on start/end position       */    private static class MyImageView extends ImageView    {    private Rect mSrcRect;    private Rect mDstRect;    private Paint mPaint;        public MyImageView(Context context) {super(context);mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);}/**     * Setting the bitmap offests to control the visible area     *     * @param width   The bitmap image     * @param bmp          The start Y position     * @param loc          The end Y position     * @return     */public void setImageOffsets(int width, int startY, int endY){mSrcRect = new Rect(0, startY, width, endY);mDstRect = new Rect(0, 0, width, endY - startY);}@Overrideprotected void onDraw(Canvas canvas){Bitmap bm = null;Drawable drawable = getDrawable();if (null != drawable && drawable instanceof BitmapDrawable){bm = ((BitmapDrawable)drawable).getBitmap();}if (null == bm){super.onDraw(canvas);}else{canvas.drawBitmap(bm, mSrcRect, mDstRect, mPaint);}}        }}