如何从Uri获取位图? [英] How to get Bitmap from an Uri?

问题描述

如何从Uri获取位图对象(如果我成功将其存储在 /data/data/MYFOLDER/myimage.png或file///data/data/MYFOLDER/myimage.png)可以在我的应用程序中使用它?

How to get a Bitmap object from an Uri (if I succeed to store it in /data/data/MYFOLDER/myimage.png or file///data/data/MYFOLDER/myimage.png) to use it in my application?

有人对如何做到这一点有想法吗?

Does anyone have an idea on how to accomplish this?

推荐答案

. . 重要提示:有关更好的解决方案，请参见下面@Mark Ingram和@pjv的答案. .

您可以尝试以下方法:

public Bitmap loadBitmap(String url)
{
    Bitmap bm = null;
    InputStream is = null;
    BufferedInputStream bis = null;
    try 
    {
        URLConnection conn = new URL(url).openConnection();
        conn.connect();
        is = conn.getInputStream();
        bis = new BufferedInputStream(is, 8192);
        bm = BitmapFactory.decodeStream(bis);
    }
    catch (Exception e) 
    {
        e.printStackTrace();
    }
    finally {
        if (bis != null) 
        {
            try 
            {
                bis.close();
            }
            catch (IOException e) 
            {
                e.printStackTrace();
            }
        }
        if (is != null) 
        {
            try 
            {
                is.close();
            }
            catch (IOException e) 
            {
                e.printStackTrace();
            }
        }
    }
    return bm;
}

但是请记住，仅应在线程(而不是GUI -thread)内调用此方法.我是AsyncTask.

But remember, this method should only be called from within a thread (not GUI -thread). I a AsyncTask.

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