正確旋轉 ImageView 和 FrameLayout (Rotate ImageView and FrameLayout correctly)

問題描述

正確旋轉 ImageView 和 FrameLayout (Rotate ImageView and FrameLayout correctly)

所以我的主要目標是正確旋轉圖像（以及 CustomFrameLayout），我還需要存儲圖像的源寬度/高度。我怎樣才能做到這一點？
我試圖設置 scaleType.center / scaletype.centerInisde ，但是這是錯誤的想法。
有什麼建議嗎？謝謝！</p>

參考解法

方法 1:

Don't know if i exactly understand your problem. If u want programmatically rotate something u can try this:

ImageView image.animate().rotation(90).start();

or this

FrameLayout frame.animate().rotation(90).start();

or both. To store Width/Height u can use

int image_h = image.getHeight();
int image_w = image.getWidth();

方法 2:

Better late than never.

I was facing the exactly same problem. After some trying, I came with this solution:

private void rotateImageBy90(){
    imageView.animate()
            .rotation(90)
            .setInterpolator(new AccelerateDecelerateInterpolator())
            .setDuration(250)
            .setListener(rotateListener)
            .start();
    Log.d("chatImage", "Rotating image by "+90+" degrees clockwise");
}

Declare an AnimatorListener, the one that solves the problem:

Animator.AnimatorListener rotateListener = new Animator.AnimatorListener() {
    @Override
    public void onAnimationStart(Animator animator) {

    }

    @Override
    public void onAnimationEnd(Animator animator) {
        FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) imageView.getLayoutParams();
        params.height = FrameLayout.LayoutParams.MATCH_PARENT;
        params.width = FrameLayout.LayoutParams.MATCH_PARENT;
        imageView.setLayoutParams(params);
        imageView.requestLayout();

        //This is the trick: I get the current bitmap, rotate it 
        Bitmap newBitmap = rotateImage(((BitmapDrawable)imageView.getDrawable()).getBitmap(),90);
        //Then, rotate the imageview back to it's original position, without animation
        imageView.setRotation(0);
        //As I set the new, rotate bitmap, to it.
        imageView.setImageBitmap(newBitmap);
    }

    @Override
    public void onAnimationCancel(Animator animator) {

    }

    @Override
    public void onAnimationRepeat(Animator animator) {

    }
};

The rotateImage method:

public static Bitmap rotateImage(Bitmap source, float angle) {
    Matrix matrix = new Matrix();
    matrix.postRotate(angle);
    return Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix,
            true);
}

(by XTL、Jotunheim、Vitor Hugo Schwaab)

參考文件

1. Rotate ImageView and FrameLayout correctly (CC BY‑SA 2.5/3.0/4.0)