如何以编程方式在圆角图像视图中设置自定义背景颜色

Question

我设置了一个圆形图像视图Rounded image view，我不知道如何为它设置背景颜色。我曾尝试设置背景方法来填充图像中的颜色。

public Bitmap roundCornerImage(Bitmap raw, float round) {
    int width = raw.getWidth();
    int height = raw.getHeight();
    Bitmap result = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(result);
    canvas.drawARGB(0, 0, 0, 0);
    final Paint paint = new Paint();
    paint.setAntiAlias(true);
    paint.setColor(Color.parseColor("#000000"));
    final Rect rect = new Rect(0, 0, width, height);
    final RectF rectF = new RectF(rect);
    canvas.drawRoundRect(rectF, round, round, paint);
    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
    canvas.drawBitmap(raw, rect, rect, paint);
    return result;
}

Answer 1

canvas.drawARGB(0, 0, 0, 0)

此行将绘制黑色颜色的画布。如果您只想更改颜色，请更改rgb值。例如

canvas.drawARGB(255, 0, 0, 0)

将绘制一个红色位图画布。

Answer 2

public GameObject GameObjectToShake;
bool shaking = false;

IEnumerator shakeGameObjectCOR(GameObject objectToShake, float totalShakeDuration, float decreasePoint, bool objectIs2D = false)
{
    if (decreasePoint >= totalShakeDuration)
    {
        Debug.LogError("decreasePoint must be less than totalShakeDuration...Exiting");
        yield break; //Exit!
    }

    //Get Original Pos and rot
    Transform objTransform = objectToShake.transform;
    Vector3 defaultPos = objTransform.position;
    Quaternion defaultRot = objTransform.rotation;

    float counter = 0f;

    //Shake Speed
    const float speed = 0.1f;

    //Angle Rotation(Optional)
    const float angleRot = 4;

    //Do the actual shaking
    while (counter < totalShakeDuration)
    {
        counter += Time.deltaTime;
        float decreaseSpeed = speed;
        float decreaseAngle = angleRot;

        //Shake GameObject
        if (objectIs2D)
        {
            //Don't Translate the Z Axis if 2D Object
            Vector3 tempPos = defaultPos + UnityEngine.Random.insideUnitSphere * decreaseSpeed;
            tempPos.z = defaultPos.z;
            objTransform.position = tempPos;

            //Only Rotate the Z axis if 2D
            objTransform.rotation = defaultRot * Quaternion.AngleAxis(UnityEngine.Random.Range(-angleRot, angleRot), new Vector3(0f, 0f, 1f));
        }
        else
        {
            objTransform.position = defaultPos + UnityEngine.Random.insideUnitSphere * decreaseSpeed;
            objTransform.rotation = defaultRot * Quaternion.AngleAxis(UnityEngine.Random.Range(-angleRot, angleRot), new Vector3(1f, 1f, 1f));
        }
        yield return null;


        //Check if we have reached the decreasePoint then start decreasing  decreaseSpeed value
        if (counter >= decreasePoint)
        {
            Debug.Log("Decreasing shake");

            //Reset counter to 0 
            counter = 0f;
            while (counter <= decreasePoint)
            {
                counter += Time.deltaTime;
                decreaseSpeed = Mathf.Lerp(speed, 0, counter / decreasePoint);
                decreaseAngle = Mathf.Lerp(angleRot, 0, counter / decreasePoint);

                Debug.Log("Decrease Value: " + decreaseSpeed);

                //Shake GameObject
                if (objectIs2D)
                {
                    //Don't Translate the Z Axis if 2D Object
                    Vector3 tempPos = defaultPos + UnityEngine.Random.insideUnitSphere * decreaseSpeed;
                    tempPos.z = defaultPos.z;
                    objTransform.position = tempPos;

                    //Only Rotate the Z axis if 2D
                    objTransform.rotation = defaultRot * Quaternion.AngleAxis(UnityEngine.Random.Range(-decreaseAngle, decreaseAngle), new Vector3(0f, 0f, 1f));
                }
                else
                {
                    objTransform.position = defaultPos + UnityEngine.Random.insideUnitSphere * decreaseSpeed;
                    objTransform.rotation = defaultRot * Quaternion.AngleAxis(UnityEngine.Random.Range(-decreaseAngle, decreaseAngle), new Vector3(1f, 1f, 1f));
                }
                yield return null;
            }

            //Break from the outer loop
            break;
        }
    }
    objTransform.position = defaultPos; //Reset to original postion
    objTransform.rotation = defaultRot;//Reset to original rotation

    shaking = false; //So that we can call this function next time
    Debug.Log("Done!");
}


void shakeGameObject(GameObject objectToShake, float shakeDuration, float decreasePoint, bool objectIs2D = false)
{
    if (shaking)
    {
        return;
    }
    shaking = true;
    StartCoroutine(shakeGameObjectCOR(objectToShake, shakeDuration, decreasePoint, objectIs2D));
}

void Start()
{
    shakeGameObject(GameObjectToShake, 5, 3f, false);
}

Answer 3

setBackgroundColor(Color.rgb(100, 100, 50));

或者更改父布局的背景颜色。