How to convert a Base64 string into a Bitmap image to show it in a ImageView?
This is a very old thread but thought to share this answer as it took lot of my development time to manage NULL
return of BitmapFactory.decodeByteArray()
as @Anirudh has faced.
If the encodedImage
string is a JSON
response, simply use Base64.URL_SAFE
instead of Base64.DEAULT
byte[] decodedString = Base64.decode(encodedImage, Base64.URL_SAFE);
Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
To anyone who is still interested in this question: If: 1-decodeByteArray returns null 2-Base64.decode throws bad-base64 Exception
Here is the solution: -You should consider the value sent to you from API is Base64 Encoded and should be decoded first in order to cast it to a Bitmap object! -Take a look at your Base64 encoded String, If it starts with
data:image/jpg;base64
The Base64.decode won't be able to decode it, So it has to be removed from your encoded String:
final String encodedString = "data:image/jpg;base64, ....";
final String pureBase64Encoded = encodedString.substring(encodedString.indexOf(",") + 1);
Now the pureBase64Encoded object is ready to be decoded:
final byte[] decodedBytes = Base64.decode(pureBase64Encoded, Base64.DEFAULT);
Now just simply use the line below to turn this into a Bitmap Object! :
Bitmap decodedBitmap = BitmapFactory.decodeByteArray(decodedBytes, 0, decodedBytes.length);
Or if you're using the great library Glide:
Glide.with(CaptchaFragment.this).load(decodedBytes).crossFade().fitCenter().into(mCatpchaImageView);
This should do the job! It wasted one day on this and came up to this solution!
Note: If you are still getting bad-base64 error consider other Base64.decode flags like Base64.URL_SAFE and so on
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);
To check online you can use
http://codebeautify.org/base64-to-image-converter
You can convert string to image like this way
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Base64;
import android.widget.ImageView;
import java.io.ByteArrayOutputStream;
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