How to set selected area of Image to ImageView

问题

I Was trying to set image to imageimageviewview from external storage and I done with that, but the thing is that it sets the whole image to imageview and I only want to set the selected square area from that image. Just life facebook provided functionality to set profile pic.. Can any one help me to do it?? Following is the sample what i want to do..

回答1:

Something like this:

public static Bitmap cropBitmapToSquare(Bitmap bmp) {

    System.gc();
    Bitmap result = null;
    int height = bmp.getHeight();
    int width = bmp.getWidth();
    if (height <= width) {
        result = Bitmap.createBitmap(bmp, (width - height) / 2, 0, height,
                height);
    } else {
        result = Bitmap.createBitmap(bmp, 0, (height - width) / 2, width,
                width);
    }
    return result;
}

Here is a sample with crop activity:

http://khurramitdeveloper.blogspot.ru/2013/07/capture-or-select-from-gallery-and-crop.html

回答2:

actually my comment above about setImageMatrix was not the best solution, try this custom Drawable (no need to allocate any temporary Bitmaps):

class CropDrawable extends BitmapDrawable {

    private Rect mSrc;
    private RectF mDst;

    public CropDrawable(Bitmap b, int left, int top, int right, int bottom) {
        super(b);
        mSrc = new Rect(left, top, right, bottom);
        mDst = new RectF(0, 0, right - left, bottom - top);
    }

    @Override
    public void draw(Canvas canvas) {
        canvas.drawBitmap(getBitmap(), mSrc, mDst, null);
    }

    @Override
    public int getIntrinsicWidth() {
        return mSrc.width();
    }

    @Override
    public int getIntrinsicHeight() {
        return mSrc.height();
    }
}

and testing code:

    ImageView iv = new ImageView(this);
    Bitmap b = BitmapFactory.decodeResource(getResources(), R.drawable.test);
    Drawable d = new CropDrawable(b, 150, 100, 180, 130);
    iv.setImageDrawable(d);
    setContentView(iv);

来源：https://stackoverflow.com/questions/21701447/how-to-set-selected-area-of-image-to-imageview

标签

android

imageview