java-重置BufferedInputStream保留一个FileInputStream

概述我分两个步骤解码jpeg.>检查边界,必要时确定比例.>在屏幕限制内解码.publicstaticBitmapdecodeSampledBitmapFromInputStream(InputStreamdata,intreqWidth,intreqHeight){//FirstdecodewithinJustDecodeBounds=truetocheckdimensionsfinalBitmapFact

我分两个步骤解码jpeg.

>检查边界,必要时确定比例.
>在屏幕限制内解码.

public static Bitmap decodeSampledBitmapFrominputStream(inputStream data, int reqWIDth, int reqHeight){    // First decode with inJustDecodeBounds=true to check dimensions    final BitmapFactory.Options options = new BitmapFactory.Options();    options.inJustDecodeBounds = true;    BitmapFactory.decodeStream(data, null, options);    // Calculate inSampleSize    options.inSampleSize = Util.getExactSampleSize(options, reqWIDth, reqHeight);    // Decode bitmap with inSampleSize set    options.inJustDecodeBounds = false;    try {        // Todo: This works, but is there a better way?        if (data instanceof fileinputStream)            ((fileinputStream)data).getChannel().position(0);        else            data.reset();    } catch (IOException e) {        e.printstacktrace();        return null;    }    return BitmapFactory.decodeStream(data, null, options);}

当基础流是fileinputStream时,它将在reset()上崩溃,并带有：

java.io.IOException: Mark has been invalIDated.

因此,我添加了instanceof部分以手动重置fileinputStreams的位置,但这似乎是一个很尴尬的解决方案.有没有办法正确重置封装fileinputStream的BufferedinputStream？

解决方法:

使用inputStream.reset之前,必须先调用inputStream.mark,以标记要稍后返回的位置.

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