旋转Android中的可绘制 [英] Rotating a drawable in Android

问题描述

如何才能绘制对象从资源加载，当它被绘制旋转？例如，我想画一个箭头，并能够旋转面对不同的方向，当它被绘制？

How can a Drawable loaded from a resource be rotated when it is drawn? For example, I would like to draw an arrow and be able to rotate it to face in different directions when it is drawn?

推荐答案

您需要使用位图和Canvas类函数prepare绘制：

You need to use Bitmap and Canvas Class functions to prepare drawable:

Bitmap bmpOriginal = BitmapFactory.decodeResource(this.getResources(), R.drawable.image2);
Bitmap bmResult = Bitmap.createBitmap(bmpOriginal.getWidth(), bmpOriginal.getHeight(), Bitmap.Config.ARGB_8888);
Canvas tempCanvas = new Canvas(bmResult); 
tempCanvas.rotate(90, bmpOriginal.getWidth()/2, bmpOriginal.getHeight()/2);
tempCanvas.drawBitmap(bmpOriginal, 0, 0, null);

mImageView.setImageBitmap(bmResult);

在90度以上图像中心这个code样本轮换出现。

In this code sample rotation for 90 degrees over image center occurs.

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