Base64 support for different API levels
AndroidBase64KotlinAndroid Problem Overview
In my Android app
build.gradle
android {
compileSdkVersion 27
defaultConfig {
minSdkVersion 16
targetSdkVersion 27
...
}
....
}
Kotlin code
val data = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
Base64.getDecoder().decode(str)
} else {
Base64.decode(str, Base64.DEFAULT) // Unresolved reference: decode
}
Obviously, I got compilation error, when using Base64 variant prior to API 24.
But how can I support all the API levels and use Base64 as before 24, as after?
Android Solutions
Solution 1 - Android
Use android.util.Base64
will resolve your problem its available from API 8
data = android.util.Base64.decode(str, android.util.Base64.DEFAULT);
Example usage:
Log.i(TAG, "data: " + new String(data));
Solution 2 - Android
fun String.toBase64(): String {
return String(
android.util.Base64.encode(this.toByteArray(), android.util.Base64.DEFAULT),
StandardCharsets.UTF_8
)
}
fun String.fromBase64(): String {
return String(
android.util.Base64.decode(this, android.util.Base64.DEFAULT),
StandardCharsets.UTF_8
)
}
Solution 3 - Android
You should be using the android.util.Base64 class. It is supported from API 8,
The Base64.getDecoder() function is part of java.util.Base64 and new in Java8.
Solution 4 - Android
private String encodeFromImage() {
String encode = null;
if (imageView.getVisibility() == View.VISIBLE) {
Bitmap bitmap = ((BitmapDrawable) imageView.getDrawable()).getBitmap();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
//encode = Base64.encodeToString(stream.toByteArray(), Base64.DEFAULT);
//String path = MediaStore.Images.Media.insertImage(getContentResolver(), bitmap,"Title",null);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
encode = Base64.getEncoder().encodeToString(stream.toByteArray());
} else {
encode = android.util.Base64.encodeToString(stream.toByteArray(), android.util.Base64.DEFAULT);
}
}
return encode;
}