Image from SD storage to ByteArray

Question

Edit: I don't know how to convert an image file (example.jpg) to byteArray I am trying to understand how it is done but I got nothing so far, I have tried different methods found in this site but nothing seems to work for me. I have resulted in asking in here so I might be able to understand how it's done with the help of others

I have an image file in my sdcard and I know my path, now I want to take that image and convert it to byteArray, I am getting wrong results in my logcat or so I think I do. I am not sure how the output should be

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.StrictMode;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Base64;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.google.android.gms.awareness.snapshot.internal.Snapshot;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.Circle;
import com.google.android.gms.maps.model.CircleOptions;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.GoogleMap.SnapshotReadyCallback;
import com.google.android.gms.maps.GoogleMap.OnMapLoadedCallback;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.util.Date;
import java.util.Map;

import static android.R.attr.bitmap;
import static android.R.attr.duration;

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
    public byte[] B;
    private GoogleMap mMap;
    GPSTracker gps;
    public File imageFile ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);

    }


    /**
     Create the map when the map is ready OnMapReady, The object GPS is ccalled (GPSTraccker) to obtain
     Values for lat and long.
     */
    final Handler handler = new Handler();

    @Override
    public void onMapReady(final GoogleMap googleMap) {
        mMap = googleMap;

        // Add a marker in Sydney and move the camera
        gps = new GPSTracker(MapsActivity.this);
        double latitude = gps.getLatitude();
        double longitude = gps.getLongitude();
        LatLng sydney = new LatLng(latitude, longitude);
        //adding an automated marker to mark the users spot on the map.
        mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Cyprus"));

        mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
        mMap.animateCamera(CameraUpdateFactory.zoomTo(19.0f));
        mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
          //When the map is clicked the following will occure

            @Override
            public void onMapClick(LatLng point) {
                //create a new marker on the new lat/long of the spot clicked
                MarkerOptions marker = new MarkerOptions().position(
                        new LatLng(point.latitude, point.longitude)).title("New Marker");
                //places the marker
                mMap.addMarker(marker);
                //create an object of Bitmap
                Bitmap bitmap;
                //Creating and calling object Snapshot
                SnapshotReadyCallback callback = new SnapshotReadyCallback() {
                    @Override
                    //when the snapshot is ready do the following
                    public void onSnapshotReady(Bitmap bitmap) {
                    //Creating object Date and storing it to now
                        Date now = new Date();
                        //Retribing exact date and storing it to now
                        android.text.format.DateFormat.format("yyyy-MM-dd_hh:mm:ss", now);


                        try {
                            //dissabling strick mode for testing , remember to remvoe this code
                            StrictMode.ThreadPolicy old = StrictMode.getThreadPolicy();
                            StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder(old)
                                    .permitDiskWrites()
                                    .build());

                            //mpath = /sd/date.jpg creating a dir for the image to be snaped
                            String mPath = Environment.getExternalStorageDirectory().toString() + "/" + now + ".jpg";
                           //Calling object File.
                            File imageFile = new File(mPath);
                            FileOutputStream out = new FileOutputStream(imageFile);
                            //outputing streaming to /imagefile
                            bitmap.compress(Bitmap.CompressFormat.PNG, 90, out);

                            Log.d("Var:OUT: ", " " + out);
                            Log.d("ImageFile" ,""+ imageFile) ;
                            Log.d("mPath" ,""+ mPath) ;
                            //decompose image
                            Bitmap bmp = BitmapFactory.decodeFile(mPath);

                            ByteArrayOutputStream stream = new ByteArrayOutputStream();

                            StrictMode.setThreadPolicy(old);
                            ByteArrayOutputStream streams = new ByteArrayOutputStream();
                            bmp.compress(Bitmap.CompressFormat.PNG, 100, streams);


                            bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream);
                            byte[] image=stream.toByteArray();
                            System.out.println("byte array:"+image);
                            Log.d("array", image.toString());
                            String img_str = Base64.encodeToString(image, 0);
                            Log.d("array_Str",img_str);
                            System.out.println("string:"+img_str);
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                };

                mMap.snapshot(callback);


                System.out.println(point.latitude + "---" + point.longitude);


            }
        });

    }

  //  public byte[] getBytesFromBitmap(Bitmap bitmap) {
  //      ByteArrayOutputStream stream = new ByteArrayOutputStream();
  //      bitmap.compress(Bitmap.CompressFormat.JPEG, 90, now);
  ////      Log.d("ARRAY", "" + now.toByteArray());
  //    byte[]  B = stream.toByteArray();

   //     return stream.toByteArray();

//}





    public void onSnapshotReady (Bitmap bitmap) {
        Date now = new Date();
        android.text.format.DateFormat.format("yyyy-MM-dd_hh:mm:ss", now);
        Log.d("DOulefko","test");
        try {
            // image naming and path  to include sd card  appending name you choose for file
            String mPath = Environment.getExternalStorageDirectory().toString() + "/" + now + ".jpg";

            // create bitmap screen capture
            View v1 = getWindow().getDecorView().getRootView();

            v1.setDrawingCacheEnabled(true);
        bitmap = Bitmap.createBitmap(v1.getDrawingCache());
            v1.setDrawingCacheEnabled(false);

            File imageFile = new File(mPath);

            FileOutputStream outputStream = new FileOutputStream(imageFile);
            int quality = 100;
            bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream);
            outputStream.flush();
            outputStream.close();

        } catch (Throwable e) {
            // Several error may come out with file handling or OOM
            e.printStackTrace();
        }
    }
    private void openScreenshot(File imageFile) {
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_VIEW);
        Uri uri = Uri.fromFile(imageFile);
        intent.setDataAndType(uri, "image/*");
        startActivity(intent);
    }
}

My logcat (not including the entire base64)

11-15 11:46:25.565 19702-19702/com.example.apostolis.gpsapi15 I/art: Late-enabling -Xcheck:jni 11-15 11:46:25.597 19702-19702/com.example.apostolis.gpsapi15 W/System: ClassLoader referenced unknown path: /data/app/com.example.apostolis.gpsapi15-1/lib/arm64 11-15 11:46:25.600 19702-19702/com.example.apostolis.gpsapi15 I/MultiDex: VM with version 2.1.0 has multidex support 11-15 11:46:25.600 19702-19702/com.example.apostolis.gpsapi15 I/MultiDex: install 11-15 11:46:25.600 19702-19702/com.example.apostolis.gpsapi15 I/MultiDex: VM has multidex support, MultiDex support library is disabled. 11-15 11:46:25.603 19702-19702/com.example.apostolis.gpsapi15 I/FirebaseInitProvider: FirebaseApp initialization unsuccessful 11-15 11:46:25.616 19702-19702/com.example.apostolis.gpsapi15 W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable 11-15 11:46:25.622 19702-19702/com.example.apostolis.gpsapi15 D/PhoneWindow: state.preset = false, color: 0, translucent = 0 11-15 11:46:25.622 19702-19702/com.example.apostolis.gpsapi15 D/PhoneWindow: state.preset = false, color: 0, translucent = 0 11-15 11:46:25.622 19702-19702/com.example.apostolis.gpsapi15 D/PhoneWindow: state.preset = false, color: 0, translucent = 0 11-15 11:46:25.624 19702-19702/com.example.apostolis.gpsapi15 D/PhoneWindow: state.preset = false, color: -16777216, translucent = 0 11-15 11:46:25.629 19702-19702/com.example.apostolis.gpsapi15 V/BoostFramework: mAcquireFunc method = public int com.qualcomm.qti.Performance.perfLockAcquire(int,int[]) 11-15 11:46:25.630 19702-19702/com.example.apostolis.gpsapi15 V/BoostFramework: mReleaseFunc method = public int com.qualcomm.qti.Performance.perfLockRelease() 11-15 11:46:25.630 19702-19702/com.example.apostolis.gpsapi15 V/BoostFramework: mAcquireTouchFunc method = public int com.qualcomm.qti.Performance.perfLockAcquireTouch(android.view.MotionEvent,android.util.DisplayMetrics,int,int[]) 11-15 11:46:25.630 19702-19702/com.example.apostolis.gpsapi15 V/BoostFramework: mIOPStart method = public int com.qualcomm.qti.Performance.perfIOPrefetchStart(int,java.lang.String) 11-15 11:46:25.630 19702-19702/com.example.apostolis.gpsapi15 V/BoostFramework: mIOPStop method = public int com.qualcomm.qti.Performance.perfIOPrefetchStop() 11-15 11:46:25.632 19702-19702/com.example.apostolis.gpsapi15 V/BoostFramework: BoostFramework() : mPerf = com.qualcomm.qti.Performance@5ec1d49 11-15 11:46:25.632 19702-19702/com.example.apostolis.gpsapi15 V/BoostFramework: BoostFramework() : mPerf = com.qualcomm.qti.Performance@5eae64e 11-15 11:46:25.655 19702-19702/com.example.apostolis.gpsapi15 D/AppTracker: App Event: start 11-15 11:46:25.662 19702-19717/com.example.apostolis.gpsapi15 D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true 11-15 11:46:25.667 19702-19702/com.example.apostolis.gpsapi15 D/AppTracker: App Event: stop 11-15 11:46:25.684 19702-19702/com.example.apostolis.gpsapi15 D/PhoneWindow: state.preset = true, color: -16777216, translucent = 0 11-15 11:46:25.708 19702-19717/com.example.apostolis.gpsapi15 I/Adreno: QUALCOMM build
: 19f8f74, Iac38d51750 Build Date : 06/06/16 OpenGL ES Shader Compiler Version: XE031.07.00.01 Local Branch : case2489916_Unmap_crash Remote Branch : Remote Branch : Reconstruct Branch : 11-15 11:46:25.712 19702-19717/com.example.apostolis.gpsapi15 I/OpenGLRenderer: Initialized EGL, version 1.4 11-15 11:46:25.721 19702-19702/com.example.apostolis.gpsapi15 D/AbstractTracker: Event success 11-15 11:46:25.725 19702-19702/com.example.apostolis.gpsapi15 D/AbstractTracker: Event success 11-15 11:46:25.740 19702-19717/com.example.apostolis.gpsapi15 E/HAL: load: gralloc.msm8996.so 11-15 11:46:37.663 19702-19702/com.example.apostolis.gpsapi15 D/AppTracker: App Event: start 11-15 11:46:37.705 19702-19702/com.example.apostolis.gpsapi15 D/AbstractTracker: Event success 11-15 11:46:38.715 19702-19702/com.example.apostolis.gpsapi15 D/LocationManager: requestLocationUpdates listener=com.example.apostolis.gpsapi15.GPSTracker@f1972c8 packageName= com.example.apostolis.gpsapi15 11-15 11:46:38.718 19702-19702/com.example.apostolis.gpsapi15 D/Network: Network 11-15 11:46:38.735 19702-19702/com.example.apostolis.gpsapi15 D/AppTracker: App Event: stop 11-15 11:46:38.749 19702-19702/com.example.apostolis.gpsapi15 D/PhoneWindow: state.preset = false, color: 0, translucent = 0 11-15 11:46:38.749 19702-19702/com.example.apostolis.gpsapi15 D/PhoneWindow: state.preset = false, color: 0, translucent = 0 11-15 11:46:38.749 19702-19702/com.example.apostolis.gpsapi15 D/PhoneWindow: state.preset = false, color: 0, translucent = 0 11-15 11:46:38.750 19702-19702/com.example.apostolis.gpsapi15 D/PhoneWindow: state.preset = false, color: -16777216, translucent = 0 11-15 11:46:38.757 19702-19702/com.example.apostolis.gpsapi15 I/zzai: Making Creator dynamically 11-15 11:46:38.797 19702-19702/com.example.apostolis.gpsapi15 W/System: ClassLoader referenced unknown path: /data/user/0/com.google.android.gms/app_chimera/m/0000000e/n/arm64-v8a 11-15 11:46:38.818 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskReadViolation 11-15 11:46:38.822 19702-19702/com.example.apostolis.gpsapi15 I/Google Maps Android API: Google Play services client version: 9877000 11-15 11:46:38.826 19702-19702/com.example.apostolis.gpsapi15 I/Google Maps Android API: Google Play services package version: 10084448 11-15 11:46:38.832 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskReadViolation 11-15 11:46:38.846 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskReadViolation 11-15 11:46:38.857 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskReadViolation 11-15 11:46:38.880 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskReadViolation 11-15 11:46:38.891 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskReadViolation 11-15 11:46:38.911 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskReadViolation 11-15 11:46:38.925 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskReadViolation 11-15 11:46:38.939 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskReadViolation 11-15 11:46:38.939 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskWriteViolation 11-15 11:46:38.960 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskReadViolation 11-15 11:46:38.989 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskReadViolation 11-15 11:46:38.989 19702-19702/com.example.apostolis.gpsapi15 I/c: Token loaded from file. Expires in: 430122644 ms. 11-15 11:46:38.989 19702-19702/com.example.apostolis.gpsapi15 I/c: Scheduling next attempt in 429822 seconds. 11-15 11:46:39.018 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskWriteViolation 11-15 11:46:39.019 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskWriteViolation 11-15 11:46:39.032 19702-19924/com.example.apostolis.gpsapi15 I/DpmTcmClient: RegisterTcmMonitor from: com.android.okhttp.TcmIdleTimerMonitor 11-15 11:46:39.073 19702-19954/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskReadViolation 11-15 11:46:39.074 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskReadViolation 11-15 11:46:39.075 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskWriteViolation 11-15 11:46:39.083 19702-19702/com.example.apostolis.gpsapi15 D/AppTracker: App Event: start 11-15 11:46:39.090 19702-19702/com.example.apostolis.gpsapi15 D/PhoneWindow: state.preset = true, color: -16777216, translucent = 0 11-15 11:46:39.122 19702-19702/com.example.apostolis.gpsapi15 D/AbstractTracker: Event success 11-15 11:46:39.137 19702-19702/com.example.apostolis.gpsapi15 D/LocationManager: requestLocationUpdates listener=com.example.apostolis.gpsapi15.GPSTracker@5f141d packageName= com.example.apostolis.gpsapi15 11-15 11:46:39.140 19702-19702/com.example.apostolis.gpsapi15 D/Network: Network 11-15 11:46:39.182 19702-19702/com.example.apostolis.gpsapi15 D/AbstractTracker: Event success 11-15 11:46:39.195 19702-19717/com.example.apostolis.gpsapi15 D/OpenGLRenderer: endAllStagingAnimators on 0x7fa01fdc00 (RippleDrawable) with handle 0x7f9b7feb80 11-15 11:46:39.942 19702-19973/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskReadViolation 11-15 11:46:40.120 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskReadViolation 11-15 11:46:40.121 19702-19702/com.example.apostolis.gpsapi15 W/f: Suppressed StrictMode policy violation: StrictModeDiskWriteViolation 11-15 11:46:41.098 19702-19956/com.example.apostolis.gpsapi15 W/DynamiteModule: Local module descriptor class for com.google.android.gms.googlecertificates not found. 11-15 11:46:41.115 19702-19956/com.example.apostolis.gpsapi15 I/DynamiteModule: Considering local module com.google.android.gms.googlecertificates:0 and remote module com.google.android.gms.googlecertificates:2 11-15 11:46:41.115 19702-19956/com.example.apostolis.gpsapi15 I/DynamiteModule: Selected remote version of com.google.android.gms.googlecertificates, version >= 2 11-15 11:46:41.117 19702-19956/com.example.apostolis.gpsapi15 E/DynamiteModule: Failed to load DynamiteLoader: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.dynamite.DynamiteModule$DynamiteLoaderClassLoader" on path: DexPathList[[zip file "/data/app/com.example.apostolis.gpsapi15-1/base.apk"],nativeLibraryDirectories=[/data/app/com.example.apostolis.gpsapi15-1/lib/arm64, /vendor/lib64, /system/lib64]] 11-15 11:46:41.117 19702-19956/com.example.apostolis.gpsapi15 W/DynamiteModule: Failed to load remote module: Failed to get module context 11-15 11:46:41.118 19702-19956/com.example.apostolis.gpsapi15 W/DynamiteModule: Failed to load module via fast routetn: Remote load failed. No local fallback found. 11-15 11:46:41.119 19702-19956/com.example.apostolis.gpsapi15 W/DynamiteModule: Local module descriptor class for com.google.android.gms.googlecertificates not found. 11-15 11:46:41.124 19702-19956/com.example.apostolis.gpsapi15 I/DynamiteModule: Considering local module com.google.android.gms.googlecertificates:0 and remote module com.google.android.gms.googlecertificates:2 11-15 11:46:41.125 19702-19956/com.example.apostolis.gpsapi15 I/DynamiteModule: Selected remote version of com.google.android.gms.googlecertificates, version = 2 11-15 11:46:49.625 19702-19702/com.example.apostolis.gpsapi15 I/System.out: 34.69429310156397---33.01508009433746 11-15 11:46:50.316 19702-19702/com.example.apostolis.gpsapi15 D/Var:OUT:: java.io.FileOutputStream@c4a6090 11-15 11:46:50.316 19702-19702/com.example.apostolis.gpsapi15 D/ImageFile: /storage/emulated/0/Tue Nov 15 11:46:50 GMT+02:00 2016.jpg 11-15 11:46:50.317 19702-19702/com.example.apostolis.gpsapi15 D/mPath: /storage/emulated/0/Tue Nov 15 11:46:50 GMT+02:00 2016.jpg 11-15 11:46:50.771 19702-19702/com.example.apostolis.gpsapi15 I/System.out: byte array:[B@4772d89 11-15 11:46:50.772 19702-19702/com.example.apostolis.gpsapi15 D/array: [B@4772d89 11-15 11:46:50.776 19702-19702/com.example.apostolis.gpsapi15 D/array_Str: iVBORw0KGgoAAAANSUhEUgAABDgAAAc4CAYAAADd+HYSAAAABHNCSVQICAgIfAhkiAAAIABJREFU eJzs3

I cant get the bytearray . I dont know waht i am doing wrong .. Or if am doing somethign wrong, can you pelase explain it to me — Satanshaves, Nov 15 '16 at 10:02
`I cant understand what I am doing wrong`. You did not explain what your code would have to do. First you should explain what you want to do exactly. Then post the code. Do not expect us to dig through your code in order to discover what should happen. — greenapps, Nov 15 '16 at 10:03
`I cant get the bytearray`. Of what? Again unclear what you can't. — greenapps, Nov 15 '16 at 10:05
http://stackoverflow.com/questions/37328890/android-firebase-dynamitemodule-failed-to-load-module-descriptor try this.... your logcat has this issue. — Rahul, Nov 15 '16 at 10:06
I have edited the post. the code is trying to get the bytearray out of the map snapshot I have created and saved on my sdcard — Satanshaves, Nov 15 '16 at 10:07
`Image from SD storage`. Ok. But what does that have to do with `to get the bytearray out of the snapshot ` ? Which connection is there between snapshot and SD card? — greenapps, Nov 15 '16 at 10:07
`Image from SD storage`. You mean an image file on SD storage? You want to place a file from SD storage in a byte array? Is that what you want to do? — greenapps, Nov 15 '16 at 10:09
`But I dont seem to get a bytearray out of the image I just created`.Why are you talking in that way? Why not: `But I dont seem to get a bytearray out of the file from SD card.` ? What does it matter how you created that file? Or who created that file? Or when? You just have a file isn't it? — greenapps, Nov 15 '16 at 10:15
Your code should be like this //decompose image Bitmap bmp = BitmapFactory.decodeFile(imgFile.getAbsolutePath()); — Sardar Khan, Nov 15 '16 at 10:17
Can you confirm that the file is created in the external storage and you can view it? You are giving the extension as `jpg` and compressing as a `png`. Make them same. Also, close the output stream after you write your `Bitmap` to a file. — Prerak Sola, Nov 15 '16 at 10:19
`yes I do, and I want to make to bytearray`. Ok. Then edit your post again and first tell us how you plan to do that. Start your post with 'I have an image file on sd card and i know the path to the file.'. (I still have not looked at your code and will not before you write down what your code should do). — greenapps, Nov 15 '16 at 10:19
I have edited again I hope its enough , I have explained my problem exactly I want the image to become bytearray — Satanshaves, Nov 15 '16 at 10:29
`I want the image to become bytearray`. I thought you wanted an image file to become a byte array. And further you did not explain how you were going to do that. So i will wait until you did. — greenapps, Nov 15 '16 at 10:38
You want to convert a `Bitmap` to `byte[]` or a `File` to `byte[]`? — Prerak Sola, Nov 15 '16 at 10:55

score 0 · Answer 1 · answered Nov 15 '16 at 11:20

You can create a byte[] from your File object using the below function.

byte[] fullyReadFileToBytes(File f) throws IOException {
        int size = (int) f.length();
        byte bytes[] = new byte[size];
        byte tmpBuff[] = new byte[size];
        FileInputStream fis= new FileInputStream(f);;
        try {
            int read = fis.read(bytes, 0, size);
            if (read < size) {
                int remain = size - read;
                while (remain > 0) {
                    read = fis.read(tmpBuff, 0, remain);
                    System.arraycopy(tmpBuff, 0, bytes, size - remain, read);
                    remain -= read;
                }
            }
        }  catch (IOException e){
            throw e;
        } finally {
            fis.close();
        }

        return bytes;
    }

After calling bitmap.compress, close the stream and pass your imageFile object to the above method like:

byte[] byteArray = fullyReadFileToBytes(imageFile);
Log.d("Activity", "Byte array: "+ Arrays.toString(byteArray));`

Image from SD storage to ByteArray

1 Answers1