Question

情况：我有一张图片，用户可以在上面添加文字，更改颜色，大小，位置，旋转，字体大小等，我需要将所有这些文本保存在一个图像中。没关系，我通过使用绘图缓存来保存它们。

   //RelativeLayout layout - layout with textviews
    layout.setDrawingCacheEnabled(true);
    Bitmap bitmap = null;
    if (layout.getDrawingCache() != null)
        bitmap = Bitmap.createBitmap(layout.getDrawingCache());
    layout.setDrawingCacheEnabled(false);

问题：由于用户设备的屏幕尺寸，结果图像可能很小。我需要分辨率为1500-2000像素的图像。如果只是调整此图像的大小 - 文本看起来模糊，不如屏幕上那么好。

问题：是否还有其他一些方法可以将文本视图保存为图像，而不仅仅是调整大小并降低文本质量？

Answer 1

好的，最后我找到了工作解决方案。

这个想法：用户在800x800像素大小的图像上添加文本视图，用它做一些事情然后我需要获得相同的图像，但在2000x2000 px。问题是 - 调整文本大小后模糊和嘈杂。但是，我如何拍摄尺寸大于屏幕的未渲染视图的屏幕截图？

这里使用的代码，它工作得很好，我得到相同的图像，文本在相同的位置，相同的大小等，但没有调整大小的噪音，文字看起来清晰，不模糊。此外，此代码保存的位图比屏幕大小大得多，并且不向用户显示。

private Bitmap makeTextLayer(int maxWidth, int maxHeight, ImageObject imageObject) {
        Context c = mContext;
        View v = LayoutInflater.from(c).inflate(R.layout.text_view_generator, new LinearLayout(c), false);
        RelativeLayout editTexts = (RelativeLayout) v.findViewById(R.id.editTexts);

        initView(v, maxWidth, maxHeight);

        for (int i = 0; i < imageObject.getEditTexts().size(); ++i) {
            ImageObject.TextInImage textInImage = imageObject.getEditTexts().get(i);
            //text view in relative layout - init his size, in my case it's as big as image
            CustomEditText editText = new CustomEditText(c);
            RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT, RelativeLayout.LayoutParams.FILL_PARENT);
            params.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE);
            // don't forget to add your view to layout, this view will be saved as screenshot
            editTexts.addView(editText, params);
            editText.getLayoutParams().width = maxWidth;
            editText.getLayoutParams().height = maxHeight;
            editText.loadTextParams(textInImage);
            editText.loadSizeAndRotation(textInImage);
            // this is important, without new init - position of text will be wrong
            initView(v, maxWidth, maxHeight);
            // and here i configure position
            editText.loadPosition();
        }

        Bitmap result = getViewBitmap(v, maxWidth, maxHeight);
        return result;
    }

    Bitmap getViewBitmap(View v, int maxWidth, int maxHeight) {
        //Get the dimensions of the view so we can re-layout the view at its current size
        //and create a bitmap of the same size
        int width = v.getWidth();
        int height = v.getHeight();

        int measuredWidth = View.MeasureSpec.makeMeasureSpec(width, View.MeasureSpec.EXACTLY);
        int measuredHeight = View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY);

        //Cause the view to re-layout
        v.measure(measuredWidth, measuredHeight);
        v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());

        //Create a bitmap backed Canvas to draw the view into
        Bitmap b = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        Canvas c = new Canvas(b);

        //Now that the view is laid out and we have a canvas, ask the view to draw itself into the canvas
        v.draw(c);

        return b;
    }

    private void initView(View view,  int maxWidth, int maxHeight){
        ViewGroup.LayoutParams vParams = view.getLayoutParams();
        //If the View hasn't been attached to a layout, or had LayoutParams set
        //return null, or handle this case however you want
        if (vParams == null) {
            return;
        }
        int wSpec = measureSpecFromDimension(vParams.width, maxWidth);
        int hSpec = measureSpecFromDimension(vParams.height, maxHeight);
        view.measure(wSpec, hSpec);
        int width = view.getMeasuredWidth();
        int height = view.getMeasuredHeight();
        //Cannot make a zero-width or zero-height bitmap
        if (width == 0 || height == 0) {
            return;
        }
        view.layout(0, 0, width, height);
    }

    private int measureSpecFromDimension(int dimension, int maxDimension) {
        switch (dimension) {
            case ViewGroup.LayoutParams.MATCH_PARENT:
                return View.MeasureSpec.makeMeasureSpec(maxDimension, View.MeasureSpec.EXACTLY);
            case ViewGroup.LayoutParams.WRAP_CONTENT:
                return View.MeasureSpec.makeMeasureSpec(maxDimension, View.MeasureSpec.AT_MOST);
            default:
                return View.MeasureSpec.makeMeasureSpec(dimension, View.MeasureSpec.EXACTLY);
        }
    }

我要感谢这些帖子中评论的作者：

Converting a view to Bitmap without displaying it in Android?

Taking a "screenshot" of a specific layout in Android

Take a screenshot of a whole View

Capture whole scrollview bigger than screen

How to screenshot or snapshot a view before it's rendered?

我在阅读它时找到了我的解决方案，如果我的解决方案不适合你 - 请查看这些帖子。

将多个TextView保存为大分辨率的图像

1 个答案: