Android app crashes No virtual method readAllBytes()

Question

We have reported some crashes from Android 9 and 10 devices when they try to read pdf file with this method:

fun getPdfImageFromUri(uri: Uri?, applicationContext: Context): String? {
    var outputString: String? = null

    uri?.let {
        ByteArrayOutputStream().apply {
            outputString = encodeToString(applicationContext.contentResolver.openInputStream(it)?.readAllBytes())
        }
    }

    return outputString
}

and crash report: java.lang.NoSuchMethodError: No virtual method readAllBytes()[B in class Ljava/io/InputStream; or its super classes (declaration of 'java.io.InputStream' appears in /apex/com.android.art/javalib/core-oj.jar)

what could cause this problem ? Seems like it works fine on Android 11-13

Answer 1

Try this code:

fun getPdfImageFromUri(uri: Uri?, applicationContext: Context): String? {
    var outputString: String? = null

    uri?.let {
        val inputStream = applicationContext.contentResolver.openInputStream(it)
        val bytes = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            inputStream?.readAllBytes()
        } else {
            inputStream?.readBytes()
        }
        outputString = encodeToString(bytes)
    }

    return outputString
}

The problem was caused by the use of the readAllBytes() method, which was introduced in Java 9. This method is not available on Android 9 and 10 devices, causing the java.lang.NoSuchMethodError to be thrown when the code is run on those devices. Here are some links that support this information:

• When to use the readAllBytes() method of InputStream in Java 9