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Commit 017b13a5 authored by Dake Gu's avatar Dake Gu
Browse files

ActivityTransition: Encode scaleType and matrix in snapshot view 

So that SharedElementCallback can setup initial imageView scale
type properly to run transition against.

b/17703309

Change-Id: I0ab212e0413fd666de605bc51ef64c8d66e4d09d
parent fdadab4b

core/java/android/app/SharedElementCallback.java

+46 −2
Original line number Diff line number Diff line
@@ -18,13 +18,16 @@ package android.app; 
import android.content.Context;

import android.content.res.Resources;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Matrix;

import android.graphics.RectF;

import android.graphics.drawable.BitmapDrawable;

import android.graphics.drawable.Drawable;

import android.os.Bundle;

import android.os.Parcelable;

import android.transition.TransitionUtils;

import android.view.View;

import android.widget.ImageView;

import android.widget.ImageView.ScaleType;



import java.util.List;

import java.util.Map;
@@ -40,6 +43,9 @@ import java.util.Map; 
 */

public abstract class SharedElementCallback {

    private Matrix mTempMatrix;

    private static final String BUNDLE_SNAPSHOT_BITMAP = "sharedElement:snapshot:bitmap";

    private static final String BUNDLE_SNAPSHOT_IMAGE_SCALETYPE = "sharedElement:snapshot:imageScaleType";

    private static final String BUNDLE_SNAPSHOT_IMAGE_MATRIX = "sharedElement:snapshot:imageMatrix";



    static final SharedElementCallback NULL_CALLBACK = new SharedElementCallback() {

    };
@@ -142,6 +148,27 @@ public abstract class SharedElementCallback { 
     */

    public Parcelable onCaptureSharedElementSnapshot(View sharedElement, Matrix viewToGlobalMatrix,

            RectF screenBounds) {

        if (sharedElement instanceof ImageView) {

            ImageView imageView = ((ImageView) sharedElement);

            Drawable d = imageView.getDrawable();

            Drawable bg = imageView.getBackground();

            if (d != null && (bg == null || bg.getAlpha() == 0)) {

                Bitmap bitmap = TransitionUtils.createDrawableBitmap(d);

                if (bitmap != null) {

                    Bundle bundle = new Bundle();

                    bundle.putParcelable(BUNDLE_SNAPSHOT_BITMAP, bitmap);

                    bundle.putString(BUNDLE_SNAPSHOT_IMAGE_SCALETYPE,

                            imageView.getScaleType().toString());

                    if (imageView.getScaleType() == ScaleType.MATRIX) {

                        Matrix matrix = imageView.getImageMatrix();

                        float[] values = new float[9];

                        matrix.getValues(values);

                        bundle.putFloatArray(BUNDLE_SNAPSHOT_IMAGE_MATRIX, values);

                    }

                    return bundle;

                }

            }

        }

        if (mTempMatrix == null) {

            mTempMatrix = new Matrix(viewToGlobalMatrix);

        } else {
@@ -169,7 +196,24 @@ public abstract class SharedElementCallback { 
     */

    public View onCreateSnapshotView(Context context, Parcelable snapshot) {

        View view = null;

        if (snapshot instanceof Bitmap) {

        if (snapshot instanceof Bundle) {

            Bundle bundle = (Bundle) snapshot;

            Bitmap bitmap = (Bitmap) bundle.getParcelable(BUNDLE_SNAPSHOT_BITMAP);

            if (bitmap == null) {

                return null;

            }

            ImageView imageView = new ImageView(context);

            view = imageView;

            imageView.setImageBitmap(bitmap);

            imageView.setScaleType(

                    ScaleType.valueOf(bundle.getString(BUNDLE_SNAPSHOT_IMAGE_SCALETYPE)));

            if (imageView.getScaleType() == ScaleType.MATRIX) {

                float[] values = bundle.getFloatArray(BUNDLE_SNAPSHOT_IMAGE_MATRIX);

                Matrix matrix = new Matrix();

                matrix.setValues(values);

                imageView.setImageMatrix(matrix);

            }

        } else if (snapshot instanceof Bitmap) {

            Bitmap bitmap = (Bitmap) snapshot;

            view = new View(context);

            Resources resources = context.getResources();

core/java/android/transition/TransitionUtils.java

+31 −0
Original line number Diff line number Diff line
@@ -22,8 +22,10 @@ import android.animation.TypeEvaluator; 
import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Matrix;

import android.graphics.Rect;

import android.graphics.RectF;

import android.graphics.drawable.BitmapDrawable;

import android.graphics.drawable.Drawable;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ImageView;
@@ -108,6 +110,35 @@ public class TransitionUtils { 
        return copy;

    }



    /**

     * Get a copy of bitmap of given drawable, return null if intrinsic size is zero

     */

    public static Bitmap createDrawableBitmap(Drawable drawable) {

        int width = drawable.getIntrinsicWidth();

        int height = drawable.getIntrinsicHeight();

        if (width <= 0 || height <= 0) {

            return null;

        }

        float scale = Math.min(1f, ((float)MAX_IMAGE_SIZE) / (width * height));

        if (drawable instanceof BitmapDrawable && scale == 1f) {

            // return same bitmap if scale down not needed

            return ((BitmapDrawable) drawable).getBitmap();

        }

        int bitmapWidth = (int) (width * scale);

        int bitmapHeight = (int) (height * scale);

        Bitmap bitmap = Bitmap.createBitmap(bitmapWidth, bitmapHeight, Bitmap.Config.ARGB_8888);

        Canvas canvas = new Canvas(bitmap);

        Rect existingBounds = drawable.getBounds();

        int left = existingBounds.left;

        int top = existingBounds.top;

        int right = existingBounds.right;

        int bottom = existingBounds.bottom;

        drawable.setBounds(0, 0, bitmapWidth, bitmapHeight);

        drawable.draw(canvas);

        drawable.setBounds(left, top, right, bottom);

        return bitmap;

    }



    /**

     * Creates a Bitmap of the given view, using the Matrix matrix to transform to the local

     * coordinates. <code>matrix</code> will be modified during the bitmap creation.