如何在android中缩放textview？

Question

任何人都可以指导我在android中的多个视图上执行放大和缩小操作吗？我需要在触摸图像,文本视图时执行放大和缩小操作.什么应该是我的父布局？这是在触摸imageview时缩放图像的代码.如何缩放textview？请帮我.

   // These matrices will be used to scale points of the image
Matrix matrix = new Matrix();
Matrix savedMatrix = new Matrix();

// The 3 states (events) which the user is trying to perform   
static final int NONE = 0;
static final int DRAG = 1;
static final int ZOOM = 2;
int mode = NONE;

// these PointF objects are used to record the point(s) the user is touching
PointF start = new PointF();
PointF mid = new PointF();
float oldDist = 1f;

private void zoom(View v, MotionEvent event) 
{
    ImageView view = (ImageView) v;
    view.setScaleType(ImageView.ScaleType.MATRIX);
    float scale;

    //  dumpEvent(event);
    // Handle touch events here...

    switch (event.getAction() & MotionEvent.ACTION_MASK) 
    {
    case MotionEvent.ACTION_DOWN:  
        // first finger down only
        savedMatrix.set(matrix);
        start.set(event.getX(), event.getY());

        mode = DRAG;
        break;

    case MotionEvent.ACTION_UP: // first finger lifted

    case MotionEvent.ACTION_POINTER_UP: // second finger lifted

        mode = NONE;   

        break;

    case MotionEvent.ACTION_POINTER_DOWN: // first and second finger down

        oldDist = spacing(event);

        if (oldDist > 5f)
        {
            savedMatrix.set(matrix);
            midPoint(mid, event);
            mode = ZOOM;

        }
        break;

    case MotionEvent.ACTION_MOVE:

        if (mode == DRAG) 
        { 
            matrix.set(savedMatrix);
            matrix.postTranslate(event.getX() - start.x, event.getY() - start.y); // create the transformation in the matrix  of points
        } 
        else if (mode == ZOOM) 
        { 
            // pinch zooming
            float newDist = spacing(event);

            if (newDist > 5f) 
            {
                matrix.set(savedMatrix);
                scale = newDist / oldDist; // setting the scaling of the
                // matrix...if scale > 1 means
                // zoom in...if scale < 1 means
                // zoom out
                matrix.postScale(scale, scale, mid.x, mid.y);
            }
        }
        break;  
    }

    view.setImageMatrix(matrix); // display the transformation on screen

}

/*
 * --------------------------------------------------------------------------
 * Method: spacing Parameters: MotionEvent Returns: float Description:
 * 
 * checks the spacing between the two fingers on touch
 * ----------------------------------------------------
 */

private float spacing(MotionEvent event) 
{
    float x = event.getX(0) - event.getX(1);
    float y = event.getY(0) - event.getY(1);
    return FloatMath.sqrt(x * x + y * y);
}

/*
 * --------------------------------------------------------------------------
 * Method: midPoint Parameters: PointF object, MotionEvent Returns: void
 * Description: calculates the midpoint between the two fingers
 * ------------------------------------------------------------
 */   

private void midPoint(PointF point, MotionEvent event) 
{
    float x = event.getX(0) + event.getX(1);
    float y = event.getY(0) + event.getY(1);
    point.set(x / 2, y / 2);
}

Answer 1

要缩放文本视图，您可以使用与缩放图像相同的代码。但你应该将textview更改为imageview，然后执行缩放操作。这是将 textview 转换为 imageview 的链接Converting a TextView->Bitmap->ImageView，但没有显示任何内容