Activity动画（二）

<style name="AnimationActivity" mce_bogus="1" parent="@android:style/Animation.Activity">
    <item name="android:activityOpenEnterAnimation">@anim/translate_between_interface_right_in</item>
    <item name="android:activityOpenExitAnimation">@anim/translate_between_interface_left_out</item>
    <item name="android:activityCloseEnterAnimation">@anim/translate_between_interface_left_in</item>
    <item name="android:activityCloseExitAnimation">@anim/translate_between_interface_right_out</item>
    <item name="android:taskOpenEnterAnimation">@anim/translate_between_interface_right_in</item>
    <item name="android:taskOpenExitAnimation">@anim/translate_between_interface_left_out</item>
    <item name="android:taskCloseEnterAnimation">@anim/translate_between_interface_left_in</item>
    <item name="android:taskCloseExitAnimation">@anim/translate_between_interface_right_out</item>
</style>

<style name="Transparent">
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowIsTranslucent">true</item>
    <item name="android:windowBackground">@android:color/transparent</item>
</style>

<activity android:name="com.example.android.activityanim.PictureDetailsActivity"
            android:label="@string/subactivity_name"
            android:theme="@style/Transparent" >
    </activity>

// Interesting data to pass across are the thumbnail size/location, the
        // resourceId of the source bitmap, the picture description, and the
        // orientation (to avoid returning back to an obsolete configuration if
        // the device rotates again in the meantime)
        int[] screenLocation = new int[2];
        v.getLocationOnScreen(screenLocation);
        PictureData info = mPicturesData.get(v);
        Intent subActivity = new Intent(ActivityAnimations.this,
                PictureDetailsActivity.class);
        int orientation = getResources().getConfiguration().orientation;
        subActivity.
                putExtra(PACKAGE + ".orientation", orientation).
                putExtra(PACKAGE + ".resourceId", info.resourceId).
                putExtra(PACKAGE + ".left", screenLocation[0]).
                putExtra(PACKAGE + ".top", screenLocation[1]).
                putExtra(PACKAGE + ".width", v.getWidth()).
                putExtra(PACKAGE + ".height", v.getHeight()).

        startActivity(subActivity);

        // Override transitions: we don't want the normal window animation in addition
        // to our custom one
        overridePendingTransition(0, 0);

// Retrieve the data we need for the picture/description to display and
    // the thumbnail to animate it from
    Bundle bundle = getIntent().getExtras();
    Bitmap bitmap = BitmapUtils.getBitmap(getResources(),
            bundle.getInt(PACKAGE_NAME + ".resourceId"));
    String description = bundle.getString(PACKAGE_NAME + ".description");
    final int thumbnailTop = bundle.getInt(PACKAGE_NAME + ".top");
    final int thumbnailLeft = bundle.getInt(PACKAGE_NAME + ".left");
    final int thumbnailWidth = bundle.getInt(PACKAGE_NAME + ".width");
    final int thumbnailHeight = bundle.getInt(PACKAGE_NAME + ".height");
    mOriginalOrientation = bundle.getInt(PACKAGE_NAME + ".orientation");

    mBitmapDrawable = new BitmapDrawable(getResources(), bitmap);
    mImageView.setImageDrawable(mBitmapDrawable);

    ViewTreeObserver observer = mImageView.getViewTreeObserver();
        observer.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {

            @Override
            public boolean onPreDraw() {
                mImageView.getViewTreeObserver().removeOnPreDrawListener(this);

                // Figure out where the thumbnail and full size versions are, relative
                // to the screen and each other
                int[] screenLocation = new int[2];
                mImageView.getLocationOnScreen(screenLocation);
                mLeftDelta = thumbnailLeft - screenLocation[0];
                mTopDelta = thumbnailTop - screenLocation[1];

                // Scale factors to make the large version the same size as the thumbnail
                mWidthScale = (float) thumbnailWidth / mImageView.getWidth();
                mHeightScale = (float) thumbnailHeight / mImageView.getHeight();

                runEnterAnimation();

                return true;
            }
        });

// Set starting values for properties we're going to animate. These
    // values scale and position the full size version down to the thumbnail
    // size/location, from which we'll animate it back up
    mImageView.setPivotX(0);
    mImageView.setPivotY(0);
    mImageView.setScaleX(mWidthScale);
    mImageView.setScaleY(mHeightScale);
    mImageView.setTranslationX(mLeftDelta);
    mImageView.setTranslationY(mTopDelta);

    // Animate scale and translation to go from thumbnail to full size
    mImageView.animate().setDuration(duration).
            scaleX(1).scaleY(1).
            translationX(0).translationY(0).
            setInterpolator(sDecelerator));

@Override
public void finish() {
    super.finish();

    // override transitions to skip the standard window animations
    overridePendingTransition(0, 0);
}

/**
 * Overriding this method allows us to run our exit animation first, then exiting
 * the activity when it is complete.
 */
@Override
public void onBackPressed() {
    runExitAnimation(new Runnable() {
        public void run() {
            // *Now* go ahead and exit the activity
            finish();
        }
    });
}

private void runExitAnimation(Runnable endAction) {
    // Animate image back to thumbnail size/location
    mImageView.animate().setDuration(duration).
               scaleX(mWidthScale).scaleY(mHeightScale).
               translationX(mLeftDelta).translationY(mTopDelta).
                            withEndAction(endAction);
}