如何将View转换为Drawable？

Question

我有一个 View，想把它转换成图片以便于存储。但是，我该如何将这个 View 转换为图片呢？

- James

Answer 1

尝试以下步骤，以便拍摄视图并将其存储在SD卡中。

View view = TextView.getRootView();
//You can use any view of your View instead of TextView

if (view != null)
{
    System.out.println("view is not null.....");
    view.setDrawingCacheEnabled(true);
    view.buildDrawingCache();
    Bitmap bm = view.getDrawingCache();

    try
    {
        if (bm != null)
        {
            String dir = Environment.getExternalStorageDirectory().toString();
            System.out.println("bm is not null.....");
            OutputStream fos = null;
            File file = new File(dir,"sample.JPEG");
            fos = new FileOutputStream(file);
            BufferedOutputStream bos = new BufferedOutputStream(fos);
            bm.compress(Bitmap.CompressFormat.JPEG, 50, bos);
            bos.flush();
            bos.close();
        }
    }
    catch(Exception e)
    {
        System.out.println("Error="+e);
        e.printStackTrace();
    }
}

- Niranj Patel

Answer 2

1. Enable drawing cache on the view:

   view.setDrawingCacheEnabled(true);
   

2. Create a bitmap from the cache:

   bitmap = Bitmap.createBitmap(view.getDrawingCache());
   

3. Save the bitmap wherever...

4. Disable drawing cache:

   view.setDrawingCacheEnabled(false);
   

- pumpkee

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这行代码 Bitmap bm = Bitmap.createBitmap(view.getDrawingCache()); 出现了 NullPointerException 错误，可能的原因是什么？ - AnujAroshA