Java tutorial
//package com.java2s; //License from project: Apache License import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import java.io.ByteArrayOutputStream; import java.io.FileNotFoundException; import java.io.InputStream; public class Main { private static byte[] getBytesFromDriveImageUri(Context context, Uri uri) { InputStream inputStream = null; try { inputStream = context.getContentResolver().openInputStream(uri); } catch (FileNotFoundException e) { e.printStackTrace(); } Bitmap bmp = BitmapFactory.decodeStream(inputStream); ByteArrayOutputStream stream = new ByteArrayOutputStream(); bmp.compress(Bitmap.CompressFormat.PNG, 100, stream); return stream.toByteArray(); } }