Rotate ImageView source from layout xml file

Question

I have this ImageView in my layout:

Answer 1

Add "id" at ImageView (if not generate auto):

 android:id="@+id/imageView"

and use the "id" (kotlin example):

val imageView = findViewById<ImageView>(R.id.imageView)
imageView.setRotation(90f) // rotate 90 degree

Answer 2

You can use Available Since API Level 11

android:rotation="90"

Final Code to Put,

<ImageView android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:rotation="90"
        android:contentDescription="@string/image_divider"
        android:paddingBottom="8dp"
        android:paddingTop="4dp"
        android:scaleType="fitXY"
        android:src="@android:drawable/divider_horizontal_textfield" />

Answer 3

You can do that in your code by creating a new bitmap object. Check this out : http://android-er.blogspot.fr/2010/07/rotate-bitmap-image-using-matrix.html And specifically this function

Matrix matrix = new Matrix();
matrix.postScale(curScale, curScale);
matrix.postRotate(curRotate);

Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, bmpWidth, bmpHeight, matrix, true);
myImageView.setImageBitmap(resizedBitmap);