Convert base64 string to image in Android

Question

I have converted an image into base64 through an online site. I went through this link to hold base64 string in a String. But i get an error saying Error:(38, 36) error: constant string too long

Please let me know how to convert base64 into an image (bitmap) in android

score 4 · Answer 1 · answered Feb 17 '17 at 10:09

4

You can just basically revert your code using some other built-in methods.

byte[] decodedString = Base64.decode(encodedImage, Base64.DEFAULT);

Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);

answered Feb 17 '17 at 10:09

Alvin Varghese

760
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score 3 · Accepted Answer · answered Feb 17 '17 at 10:14

     //encode image(from image path) to base64 string
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                Bitmap bitmap = BitmapFactory.decodeFile(pathOfYourImage);
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
                byte[] imageBytes = baos.toByteArray();
                String imageString = Base64.encodeToString(imageBytes, Base64.DEFAULT);

     //encode image(image from drawable) to base64 string
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.yourDrawableImage);
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
                byte[] imageBytes = baos.toByteArray();
                String imageString = Base64.encodeToString(imageBytes, Base64.DEFAULT);

The question is how to convert base64 into an image (bitmap) in android, not the other way around. — Tushski, Apr 09 '20 at 05:37

score 2 · Answer 3 · answered Feb 17 '17 at 10:02

Did you try to use the class BitmapFactory ?

Please try something like this :

byte[] decodedString = Base64.decode(encodedImage, Base64.DEFAULT);
Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);

Also, according to the error you get, it seems that you use a static final String to hold you encoded base64 string. In Java, the length of constant string is limited to 64k.

score 1 · Answer 4 · answered Feb 17 '17 at 10:06

First of all check your string

http://codebeautify.org/base64-to-image-converter

Try this way to convert.

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ImageView image =(ImageView)findViewById(R.id.image);

        //encode image to base64 string
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.logo);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);
        byte[] imageBytes = baos.toByteArray();
        String imageString = Base64.encodeToString(imageBytes, Base64.DEFAULT);

        //decode base64 string to image
        imageBytes = Base64.decode(imageString, Base64.DEFAULT);
        Bitmap decodedImage = BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length);
        image.setImageBitmap(decodedImage);
    }
}

http://www.thecrazyprogrammer.com/2016/10/android-convert-image-base64-string-base64-string-image.html

Convert base64 string to image in Android

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