我准备了一些指南针活动。 我有我的风.png,我希望在活动开始时缩放它,并在方向改变后旋转。
问题在于,当我缩放图像时(仅限onCreate),在第一次(也是第一次)使用rotate方法后,我的视图再次调整大小,我不知道为什么。
让我发布我的旋转和缩放方法。 rose是我的ImageView实例(ImageView rose)
请查看并发布任何建议。我应该尝试不同的方式来扩展我的ImageView吗?
感谢您的帮助!
旋转(看起来工作正常)
public void rotateRose(float angle){
angle = 360 - angle;
Matrix matrix=new Matrix();
rose.setScaleType(ScaleType.MATRIX);
pivX = rose.getDrawable().getBounds().width()/2;
pivY = rose.getDrawable().getBounds().height()/2;
matrix.preRotate((float) angle, pivX, pivY);
rose.setImageMatrix(matrix);
}
比例(找到source link)
private void scaleImage(ImageView view, int boundBoxInDp)
{
// Get the ImageView and its bitmap
Drawable drawing = view.getDrawable();
Bitmap bitmap = ((BitmapDrawable)drawing).getBitmap();
// Get current dimensions
int width = bitmap.getWidth();
int height = bitmap.getHeight();
// Determine how much to scale: the dimension requiring less scaling is
// closer to the its side. This way the image always stays inside your
// bounding box AND either x/y axis touches it.
float xScale = ((float) boundBoxInDp) / width;
float yScale = ((float) boundBoxInDp) / height;
float scale = (xScale <= yScale) ? xScale : yScale;
// Create a matrix for the scaling and add the scaling data
Matrix matrix = new Matrix();
matrix.postScale(scale, scale);
// Create a new bitmap and convert it to a format understood by the ImageView
Bitmap scaledBitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
BitmapDrawable result = new BitmapDrawable(scaledBitmap);
width = scaledBitmap.getWidth();
height = scaledBitmap.getHeight();
// Apply the scaled bitmap
view.setImageDrawable(result);
// Now change ImageView's dimensions to match the scaled image
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) view.getLayoutParams();
params.width = width;
params.height = height;
view.setLayoutParams(params);
//pivX = width/2;
// pivY = height/2;
}
答案 0 :(得分:1)
好的,我知道了!
替换
view.setImageDrawable(result);
使用在Scale方法中
view.setImageBitmap(scaledBitmap);
如果您正在寻找图像视图的缩放和旋转方法:以上这些工作正常(通过这个小改动)