Question

在我的应用程序中，当我上传图像时，我想减少数据，所以我称之为此功能。但是这段代码给了我一个outOfMemoryError。

LOGCAT：09-17 15：32：01.712：E / AndroidRuntime（7771）：at com.technow.pereo.FileHelper.reduceImageForUpload（FileHelper.java:64）

    public static byte[] reduceImageForUpload(byte[] imageData) {
    Bitmap bitmap = ImageResizer.resizeImageMaintainAspectRatio(imageData,
            SHORT_SIDE_TARGET);

    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.JPEG, 50, outputStream);
    bitmap.recycle();
    byte[] reducedData = outputStream.toByteArray();
    try {
        outputStream.close();
    } catch (IOException e) {
        // Intentionally blank
    }

    return reducedData;
}

导致此错误的原因是什么？如何解决？！

Answer 1

似乎ImageResizer是一个自定义类。在将图像带入进一步处理之前，请使用下面的代码片段重新调整图像大小。

//decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f){
    try {
        //decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(new FileInputStream(f),null,o);

        //Find the correct scale value. It should be the power of 2.
        final int REQUIRED_SIZE=70;
        int width_tmp=o.outWidth, height_tmp=o.outHeight;
        int scale=1;
        while(true){
            if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE)
                break;
            width_tmp/=2;
            height_tmp/=2;
            scale*=2;
        }

        //decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize=scale;
        return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
    } catch (FileNotFoundException e) {}
    return null;
}

尝试使用位图减小字节数据的大小时出现OutOfMemoryError

1 个答案: