不是从base64创建android位图 [英] android bitmap isn't created from base64

问题描述

我有一个Android应用程序，它将图像发送到Web服务.我想将同一张照片从Web服务发送回Android.

I have an Android application which sends an image to a web service. I want to send the same photo back from the web service to Android.

我制作了一个测试程序，以比较从Android发送到服务器的base64数据和从服务器发送到Android的base64数据-它们是完全相等的.

I made a test program to compare the base64 data that's sent from Android to the server and the base64 that's sent back from server to Android -- they are exactly equal.

我想使用基数为64的字符串来创建位图，因此我尝试了以下操作:

I want to use the base 64 string to create a bitmap, so I tried this:

String image = client1.getBaseURI("restaurantFoods/OneFood/"
            + this.getID() + "/getImage");

byte[] decodedString = Base64.decode(image, Base64.DEFAULT);
        Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0,
                decodedString.length);
if(decodedByte == null){
            Log.d(this.getFoodItem().getName(), image);
            Log.d("isNull", "Yes");
        }
        else{
            Log.d("isNull", "No");}

由于日志只显示是"，所以我一直为空.

I keep getting null because the log just prints "YES".

任何人都可以帮忙吗?

如果您想知道如何对图像进行编码，如下所示:

private String getBase64(Bitmap bitmap) {
        String imgString = Base64.encodeToString(getBytesFromBitmap(bitmap),
                Base64.NO_WRAP);
        return imgString;
    }
private byte[] getBytesFromBitmap(Bitmap bitmap) {
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        bitmap.compress(CompressFormat.JPEG, 70, stream);
        return stream.toByteArray();
    }
Bitmap icon = BitmapFactory.decodeResource(this.getResources(),
                    R.drawable.pizza);
String iconBase64 = this.getBase64(icon);

推荐答案

尝试使用此位图；

public Bitmap convert(String img){
    byte[] b = Base64.decode(img, Base64.DEFAULT);
    return BitmapFactory.decodeByteArray(b, 0, b.length);
}

这是字符串

    public String convert(Bitmap bm, int quality){
    ByteArrayOutputStream baos = new ByteArrayOutputStream();  
    bm.compress(Bitmap.CompressFormat.JPEG, quality, baos); 

    byte[] byt = baos.toByteArray(); 
    bm.recycle();
    return Base64.encodeToString(byt, Base64.DEFAULT);
}

真的，我看不到您的代码有任何实际问题，但是这些问题对我有用，因此我建议您尝试一下，看看这是否真的是您的问题.

Really I don't see any real problems with your code, but these have worked for me so I suggest that you try them and see if that is actually your problem.

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