我正在使用以下代码将 ImageView 中的图像旋转一个角度.有没有更简单和不太复杂的方法可用.
I am using the following code to rotate a image in ImageView by an angle. Is there any simpler and less complex method available.
ImageView iv = (ImageView)findViewById(imageviewid);
TextView tv = (TextView)findViewById(txtViewsid);
Matrix mat = new Matrix();
Bitmap bMap = BitmapFactory.decodeResource(getResources(),imageid);
mat.postRotate(Integer.parseInt(degree));===>angle to be rotated
Bitmap bMapRotate = Bitmap.createBitmap(bMap, 0, 0,bMap.getWidth(),bMap.getHeight(), mat, true);
iv.setImageBitmap(bMapRotate);
另一种旋转ImageView
的简单方法:
更新:
所需的进口:
Another simple way to rotate an ImageView
:
UPDATE:
Required imports:
import android.graphics.Matrix;
import android.widget.ImageView;
代码:(假设 imageView
、angle
、pivotX
& pivotY
已经定义)
Code: (Assuming imageView
, angle
, pivotX
& pivotY
are already defined)
Matrix matrix = new Matrix();
imageView.setScaleType(ImageView.ScaleType.MATRIX); //required
matrix.postRotate((float) angle, pivotX, pivotY);
imageView.setImageMatrix(matrix);
此方法不需要每次都创建新的位图.
This method does not require creating a new bitmap each time.
注意:要在运行时在 ontouch 上旋转 ImageView
,您可以在 ImageView
上设置 onTouchListener &通过添加最后两个来旋转它上述代码中的行(即 postRotate 矩阵并在 imageView 上设置它)触摸监听器 ACTION_MOVE 部分中的部分.
NOTE: To rotate an
ImageView
on ontouch at runtime you can set onTouchListener onImageView
& rotate it by adding last two lines(i.e. postRotate matrix & set it on imageView) in above code section in your touch listener ACTION_MOVE part.
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