Matrix缩放图片, 旋转图片

android.graphics.Matrix缩放图片文件:
	int bmpWidth = bitmap.getWidth();
	int bmpHeight = bitmap.getHeight();

	// 要缩小的比例 0.8
	float scale = 0.8; // 1.2
	scaleWidth = scaleWidth * scale; // scaleWidth初始值为1.0f
	scaleHeight = scaleHeight * scale; // scaleHeight初始值为1.0f

	Matrix matrix = new Matrix();
	matrix.postScale(scaleWidth, scaleHeight);

	Bitmap resizeBmp = Bitmap.createBitmap(bitmap, 0, 0, bmpWidth, bmpHeight, matrix, true);

android.graphics.Matrix旋转图片文件:
	int bmpWidth = bitmap.getWidth();
	int bmpHeight = bitmap.getHeight();
	
	Matrix matrix = new Matrix();
	matrix.postRotate(degree);   // degree为: 正数表示向右(顺时针), 负数表示向左(逆时针)
	
	Bitmap resizeBmp = Bitmap.createBitmap(bitmap, 0, 0, bmpWidth, bmpHeight, matrix, true);

 

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1 楼 我爱动画片 2011-07-14