本文选自StackOverflow(简称:SOF)精选问答汇总系列文章之一,本系列文章将为读者分享国外最优质的精彩问与答,供读者学习和了解国外最新技术。本文将讲解如何将Drawable转为Bitmap?

问:Rob

我想要设置某个Drawable作为墙纸,但是所有的墙纸功能只支持Bitmap。因为我是pre 2.1系统,所以不能使用WallpaperManager。

而且,我从网上下载的图片在R.drawable中也不能使用,出现这种情况该怎么处理?

答:varun

(最佳答案)

这种方法可以将BitmapDrawable转换成Bitmap

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Drawable
d = ImagesArrayList.get(0); 
Bitmap
bitmap = ((BitmapDrawable)d).getBitmap();

答:Praveen

通常情况下,我觉得下面代码比较有用:

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Bitmap
icon = BitmapFactory.decodeResource(context.getResources(),
                                           R.drawable.icon_resource);

注:下面介绍一种可以下载图片的版本:

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String
name = c.getString(str_url);
URL
url_value =
new

URL(name);
ImageView
profile = (ImageView)v.findViewById(R.id.vdo_icon);
if

(profile !=
null)
{
    Bitmap
mIcon1 =
        BitmapFactory.decodeStream(url_value.openConnection().getInputStream());
    profile.setImageBitmap(mIcon1);
}

答:André

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public
static Bitmap drawableToBitmap (Drawable drawable) {
    if

(drawable
instanceof

BitmapDrawable) {
        return

((BitmapDrawable)drawable).getBitmap();
    }
 
    Bitmap
bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Config.ARGB_8888);
    Canvas
canvas =
new

Canvas(bitmap);
    drawable.setBounds(0,
0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);
 
    return

bitmap;
}

答:kabuko

Drawable可以放在Canvas上,而Bitmap支持Canvas:

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public
static Bitmap drawableToBitmap (Drawable drawable) {
    if

(drawable
instanceof

BitmapDrawable) {
        return

((BitmapDrawable)drawable).getBitmap();
    }
 
    int
width = drawable.getIntrinsicWidth();
    width
= width > 0 ? width : 1;
    int
height = drawable.getIntrinsicHeight();
    height
= height > 0 ? height : 1;
 
    Bitmap
bitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);
    Canvas
canvas =
new

Canvas(bitmap);
    drawable.setBounds(0,
0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);
 
    return

bitmap;
}

原文链接:http://stackoverflow.com/questions/3035692/how-to-convert-a-drawable-to-a-bitmap

文章选自StackOverFlow社区,鉴于其内容对于开发者有所帮助,现将文章翻译于此,供大家参考及学习。9Tech将每日持续更新,读者可点击StackOverflow(简称:SOF)精选问答汇总,查看全部译文内容。同时,我们也招募志同道合的技术朋友共同翻译,造福大家!报名请发邮件至[email protected]

05-06 07:00