How to limit imageview's min scale in x

[t2314862168]

Now i have a picture, it's size is 990 X 18464 , when first load picture into imageview, it's's very small. I onDoubleTap it ,it looks better. I had seen mMaxScale in TouchImageView, but no mMinScale , please help me , thank you

[kalyaganov]

@t2314862168 you can use getMinScale method to get minimal scale. Take a look at this class TouchImageView.java

You can calculate desired scale and set it to ImageView in method public void setImageDrawable(Drawable drawable).

@Override
    public void setImageDrawable(Drawable drawable) {
        super.setImageDrawable(drawable);
        if(mDrawable != drawable) {
            mDrawable = drawable;
            if(drawable != null) {
                mDrawableIntrinsicWidth = drawable.getIntrinsicWidth();
                mDrawableIntrinsicHeight = drawable.getIntrinsicHeight();
                setInitialState();    //changed line
            } else {
                mDrawableIntrinsicWidth = 0;
                mDrawableIntrinsicHeight = 0;
            }
        }
    }

       public void setInitialState(){
                mMatrix.reset();
        final float scale= /*CALCULATE DESIRED SCALE*/;
        mMatrix.postScale(scale, scale);

        final float[] values = new float[9];
        mMatrix.getValues(values);

        final float freeSpaceHorizontal = (getMeasuredWidth() - (mDrawableIntrinsicWidth * minScale)) / 2F;
        final float freeSpaceVertical = (getMeasuredHeight() - (mDrawableIntrinsicHeight * minScale)) / 2F;
        mMatrix.postTranslate(freeSpaceHorizontal, freeSpaceVertical);

        invalidate();
       }