android.graphics.drawable.AnimationDrawable#getFrame()源码实例Demo

private Drawable tileifyAnimationDrawable(AnimationDrawable wrapped) {
	NumberAnimationDrawable drawable = new NumberAnimationDrawable();
	drawable.setOneShot(wrapped.isOneShot());
	final int N = wrapped.getNumberOfFrames();
	for (int i = 0; i < N; i++) {
		Drawable frame = wrapped.getFrame(i);
		int duration = wrapped.getDuration(i);
		drawable.addFrame(frame, duration);
	}
	return drawable;
}
 

private void loadResource(Context context, Resources resources, @XmlRes int resourceId) {
    final XmlResourceParser parser = resources.getXml(resourceId);
    final int bitmapRes;
    final float hotSpotX;
    final float hotSpotY;
    try {
        XmlUtils.beginDocument(parser, "pointer-icon");

        final TypedArray a = resources.obtainAttributes(
                parser, com.android.internal.R.styleable.PointerIcon);
        bitmapRes = a.getResourceId(com.android.internal.R.styleable.PointerIcon_bitmap, 0);
        hotSpotX = a.getDimension(com.android.internal.R.styleable.PointerIcon_hotSpotX, 0);
        hotSpotY = a.getDimension(com.android.internal.R.styleable.PointerIcon_hotSpotY, 0);
        a.recycle();
    } catch (Exception ex) {
        throw new IllegalArgumentException("Exception parsing pointer icon resource.", ex);
    } finally {
        parser.close();
    }

    if (bitmapRes == 0) {
        throw new IllegalArgumentException("<pointer-icon> is missing bitmap attribute.");
    }

    Drawable drawable;
    if (context == null) {
        drawable = resources.getDrawable(bitmapRes);
    } else {
        drawable = context.getDrawable(bitmapRes);
    }
    if (drawable instanceof AnimationDrawable) {
        // Extract animation frame bitmaps.
        final AnimationDrawable animationDrawable = (AnimationDrawable) drawable;
        final int frames = animationDrawable.getNumberOfFrames();
        drawable = animationDrawable.getFrame(0);
        if (frames == 1) {
            Log.w(TAG, "Animation icon with single frame -- simply treating the first "
                    + "frame as a normal bitmap icon.");
        } else {
            // Assumes they have the exact duration.
            mDurationPerFrame = animationDrawable.getDuration(0);
            mBitmapFrames = new Bitmap[frames - 1];
            final int width = drawable.getIntrinsicWidth();
            final int height = drawable.getIntrinsicHeight();
            for (int i = 1; i < frames; ++i) {
                Drawable drawableFrame = animationDrawable.getFrame(i);
                if (!(drawableFrame instanceof BitmapDrawable)) {
                    throw new IllegalArgumentException("Frame of an animated pointer icon "
                            + "must refer to a bitmap drawable.");
                }
                if (drawableFrame.getIntrinsicWidth() != width ||
                    drawableFrame.getIntrinsicHeight() != height) {
                    throw new IllegalArgumentException("The bitmap size of " + i + "-th frame "
                            + "is different. All frames should have the exact same size and "
                            + "share the same hotspot.");
                }
                BitmapDrawable bitmapDrawableFrame = (BitmapDrawable) drawableFrame;
                mBitmapFrames[i - 1] = getBitmapFromDrawable(bitmapDrawableFrame);
            }
        }
    }
    if (!(drawable instanceof BitmapDrawable)) {
        throw new IllegalArgumentException("<pointer-icon> bitmap attribute must "
                + "refer to a bitmap drawable.");
    }

    BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
    final Bitmap bitmap = getBitmapFromDrawable(bitmapDrawable);
    validateHotSpot(bitmap, hotSpotX, hotSpotY);
    // Set the properties now that we have successfully loaded the icon.
    mBitmap = bitmap;
    mHotSpotX = hotSpotX;
    mHotSpotY = hotSpotY;
}
 

@Override
public void setImageDrawable(Drawable drawable) {
    super.setImageDrawable(drawable);

    if (drawable == null) {
        hasDrawable = false;
        return;
    }
    if (!hasSize(drawable)) {
        return;
    }

    hasDrawable = true;
    if (originalBitmap == null) {
        if (drawable instanceof BitmapDrawable) {
            originalBitmap = ((BitmapDrawable) drawable).getBitmap();
        } else if (drawable instanceof AnimationDrawable) {
            AnimationDrawable drawable1 = (AnimationDrawable) drawable;
            Drawable drawable2 = drawable1.getFrame(0);
            if (drawable2 instanceof BitmapDrawable) {
                originalBitmap = ((BitmapDrawable) drawable2).getBitmap();
            }
        }
    }

    if (onImageLoadListener != null) {
        onImageLoadListener.onImageLoaded(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
        onImageLoadListener = null;
    }

    if (restoreInfo != null) {
        mScaleType = restoreInfo.getScaleType();
        mCropRect = restoreInfo.mWidgetRect;
        aspectX = (int) restoreInfo.mCropX;
        aspectY = (int) restoreInfo.mCropY;
        initBase();
        post(new Runnable() {
            @Override
            public void run() {
                restoreCrop();
            }
        });
    } else {
        initBase();
    }
}
 

@Override
public void setImageDrawable(Drawable drawable) {
    super.setImageDrawable(drawable);

    if (drawable == null) {
        hasDrawable = false;
        return;
    }
    if (!hasSize(drawable)) {
        return;
    }

    hasDrawable = true;
    if (originalBitmap == null) {
        if (drawable instanceof BitmapDrawable) {
            originalBitmap = ((BitmapDrawable) drawable).getBitmap();
        } else if (drawable instanceof AnimationDrawable) {
            AnimationDrawable drawable1 = (AnimationDrawable) drawable;
            Drawable drawable2 = drawable1.getFrame(0);
            if (drawable2 instanceof BitmapDrawable) {
                originalBitmap = ((BitmapDrawable) drawable2).getBitmap();
            }
        }
    }

    if (onImageLoadListener != null) {
        onImageLoadListener.onImageLoaded(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
        onImageLoadListener = null;
    }

    if (restoreInfo != null) {
        mScaleType = restoreInfo.getScaleType();
        mCropRect = restoreInfo.mWidgetRect;
        aspectX = (int) restoreInfo.mCropX;
        aspectY = (int) restoreInfo.mCropY;
        initBase();
        post(new Runnable() {
            @Override
            public void run() {
                restoreCrop();
            }
        });
    } else {
        initBase();
    }
}