Rotating a bitmap in Android
Here, we have an image of globe and I am going to rotate it.
In Android, we can rotate a bitmap in canvas. Its simple, but we have to know the save() and restore() methods in Canvas class.
We can load a bitmap using
Bitmap globe = BitmapFactory.decodeResource(context.getResources(), R.drawable.globe);
in onDraw() method,
we can rotate the bitmap using
canvas.roatate() method. But here the problem is, the whole canvas will rotate. But by using, save() and restore() we can solve this problem.
Before rotating the, just call
canvas.save() then, call
then, draw the image. After drawing the image, just call canvas.restore().
This will solve the problem of rotating the whole canvas.
To show, canvas is restored, I am drawing a text after drawing bitmap in canvas by,
canvas.drawText("Here our globe is rotating", 50, 400, textColor);
In the end of onDraw, just call invalidate();
Now, our globe will rotate.
and the text under the globe is static.
This will do.
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