Question

我尝试使用以下代码将LinearLayout转换为图像：

public static Bitmap loadBitmapFromView(View v) {
    v.measure(
            View.MeasureSpec.makeMeasureSpec(v.getLayoutParams().width, View.MeasureSpec.EXACTLY),
            View.MeasureSpec.makeMeasureSpec(v.getLayoutParams().height, View.MeasureSpec.EXACTLY));
    v.layout(0, 0, v.getMeasuredWidth(), v.getMeasuredHeight());
    Bitmap b = Bitmap.createBitmap(v.getWidth(), v.getHeight()
            , Bitmap.Config.RGB_565);
    Canvas c = new Canvas(b);
    v.draw(c);
    return b;

}

但我有这个例外

java.lang.IllegalArgumentException: bitmap size exceeds 32 bits

我如何解决这个问题？

Answer 1

使用Bitmap.Config.ARGB_8888并确保已解析的宽度和高度不为0.

或者您也可以使用getDrawingCache

view.setDrawingCacheEnabled(true);
view.buildDrawingCache(true);
Bitmap bitmap = view.getDrawingCache();

Answer 2

public static Bitmap loadBitmapFromView(View view) {
    view.setDrawingCacheEnabled(true);
    view.buildDrawingCache();
    return view.getDrawingCache();
}

Answer 3

试试这个：

private Bitmap generateBitmap(LinearLayout view)
    {
        //Provide it with a layout params. It should necessarily be wrapping the
        //content as we not really going to have a parent for it.
        view.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
                LinearLayout.LayoutParams.WRAP_CONTENT));

        //Pre-measure the view so that height and width don't remain null.
        view.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));

        //Assign a size and position to the view and all of its descendants
        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());

        //Create the bitmap
        Bitmap bitmap = Bitmap.createBitmap(view.getMeasuredWidth(),
                view.getMeasuredHeight(),
                Bitmap.Config.ARGB_8888);
        //Create a canvas with the specified bitmap to draw into
        Canvas c = new Canvas(bitmap);

        //Render this view (and all of its children) to the given Canvas
        view.draw(c);
        return bitmap;
    }

Answer 4

试试这个代码从 Android 中的 LinearLayout 获取位图：

public static Bitmap CreateBitmap(View layout) {
    layout.setDrawingCacheEnabled(true);
    layout.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
    layout.layout(0, 0, layout.getMeasuredWidth(), layout.getMeasuredHeight());
    layout.buildDrawingCache(true);
    Bitmap bitmap = Bitmap.createBitmap(layout.getWidth(), layout.getHeight(), Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    layout.draw(canvas);
    return bitmap;
}

无法从Android中的LinearLayout获取Bitmap

4 个答案: