android imageview scale,bitmap - Android: ImageView Rotation Scale

博主在尝试使用ImageView创建一个温度计样式仪表时遇到问题。当试图旋转图像时，虽然宽度仍填充屏幕，但图像本身被缩小以适应角落，导致实际显示的图像变小。博主希望图像在旋转后保持原始大小不变。目前使用的代码中，通过Matrix进行旋转，但结果不尽如人意。博主询问是否可能仅使用ImageView实现所需效果，或者需要创建自定义视图来允许部分图像超出屏幕显示。

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I have an imageView and I am basically trying to make a thermometer style gauge. I have added an image below for testing and I am basically trying to rotate the image. The first picture has the image in its standard layout. After trying to rotate the image, The width still fills the screen, but it scales the image down to make room for the corners, making the actual image appear smaller. I want the image to remain the exact same size, but rotate based on the Matrix passed to it.

Here is the code I am using for the rotation:

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

circle = (ImageView) findViewById(R.id.imageView1);

Bitmap myImg = BitmapFactory.decodeResource(getResources(), R.drawable.rotated);

Matrix matrix = new Matrix();

matrix.postRotate(45);

Bitmap rot = Bitmap.createBitmap(myImg, 0, 0, myImg.getWidth(), myImg.getHeight(),

matrix, true);

circle.setImageBitmap(rot);

}

So, I basically need the red/green circle edge to reach the edge of the screen. Is this possible with an imageView or will I need to write a custom view to allow stuff to be off screen? By the way, I am not actually gonna draw this whole circle, this is just an example to get my issue across.