I am getting a null pointer caused by boolean bitmap

Question

I am getting a null pointer of this kind Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference this is my log cat

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.umo2.players, PID: 1771
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.umo2.players/com.umo2.players.Profile.AccountSettingsActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2868)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2958)
    at android.app.ActivityThread.-wrap12(Unknown Source:0)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1653)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:164)
    at android.app.ActivityThread.main(ActivityThread.java:6739)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:449)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
 Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
    at com.umo2.players.Utils.ImageManager.getBytesFromBitmap(ImageManager.java:46)
    at com.umo2.players.Utils.FirebaseMethods.uploadNewPhoto(FirebaseMethods.java:428)
    at com.umo2.players.Profile.AccountSettingsActivity.getIncomingIntent(AccountSettingsActivity.java:90)
    at com.umo2.players.Profile.AccountSettingsActivity.onCreate(AccountSettingsActivity.java:66)
    at android.app.Activity.performCreate(Activity.java:7045)
    at android.app.Activity.performCreate(Activity.java:7036)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1217)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2815)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2958) 
    at android.app.ActivityThread.-wrap12(Unknown Source:0) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1653) 
    at android.os.Handler.dispatchMessage(Handler.java:106) 
    at android.os.Looper.loop(Looper.java:164) 
    at android.app.ActivityThread.main(ActivityThread.java:6739) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:449) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

Here are my image manager utils

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

public class ImageManager {
private static final String TAG = "ImageManager";
public static final int IMAGE_SAVE_QUALITY = 90;

public static Bitmap getBitmap(String imgUrl) {
    File imageFile = new File(imgUrl);
    FileInputStream fis = null;
    Bitmap bitmap = null;
    try {
        fis = new FileInputStream(imageFile);
        bitmap = BitmapFactory.decodeStream(fis);
    } catch (FileNotFoundException e) {
        Log.e(TAG, "getBitmap: FileNotFoundException: " + e.getMessage());
    } finally {
        try {
            fis.close();
        } catch (IOException e) {
            Log.e(TAG, "getBitmap: FileNotFoundException: " + e.getMessage());
        }
    }
    return bitmap;
}

/**
 * return byte array from a bitmap
 * quality is greater than 0 but less than 100
 *
 * @param bm
 * @param quality
 * @return
 */
public static byte[] getBytesFromBitmap(Bitmap bm, int quality){
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
  bm.compress(Bitmap.CompressFormat.JPEG, quality, stream);
    return stream.toByteArray();
}

}

This is my firebase methods

       public void uploadNewPhoto(String photoType, final String caption,final int count, final String imgUrl,
                           Bitmap bm) {
    Log.d(TAG, "uploadNewPhoto: attempting to uplaod new photo.");

    FilePaths filePaths = new FilePaths();

    if (photoType.equals(mContext.getString(R.string.new_photo))){

        Log.d(TAG, "uploadNewPhoto: uploading NEW photo.");

        String user_id = FirebaseAuth.getInstance().getCurrentUser().getUid();
        StorageReference storageReference = mStorageReference
                .child(filePaths.FIREBASE_IMAGE_STORAGE + "/" + user_id + "/photo" + (count + 1));

        //convert image url to bitmap
        if(bm == null){
            bm = com.umo2.players.Utils.ImageManager.getBitmap(imgUrl);
        }

        byte[] bytes = ImageManager.getBytesFromBitmap(bm, 100);

        UploadTask uploadTask = null;
        uploadTask = storageReference.putBytes(bytes);

        uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
            @Override
            public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                String firebaseUrl = Objects.requireNonNull(taskSnapshot.getMetadata().getReference()).getDownloadUrl().toString();

                Toast.makeText(mContext, "photo upload success", Toast.LENGTH_SHORT).show();

                //add the new photo to 'photos' node and 'user_photos' node
                addPhotoToDatabase(caption, firebaseUrl.toString());

                //navigate to the main feed so the user can see their photo
                Intent intent = new Intent(mContext, HomeActivity.class);
                mContext.startActivity(intent);
            }
        }).addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                Log.d(TAG, "onFailure: Photo upload failed.");
                Toast.makeText(mContext, "Photo upload failed ", Toast.LENGTH_SHORT).show();
            }
        }).addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() {
            @Override
            public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
                double progress = (100 * taskSnapshot.getBytesTransferred()) / taskSnapshot.getTotalByteCount();

                if(progress - 15 > mPhotoUploadProgress){
                    Toast.makeText(mContext, "photo upload progress: " + String.format("%.0f", progress) + "%", Toast.LENGTH_SHORT).show();
                    mPhotoUploadProgress = progress;
                }

                Log.d(TAG, "onProgress: upload progress: " + progress + "% done");
            }
        });

    }
    //case new profile photo
    else if(photoType.equals(mContext.getString(R.string.profile_photo))){
        Log.d(TAG, "uploadNewPhoto: uploading new PROFILE photo");


        String user_id = FirebaseAuth.getInstance().getCurrentUser().getUid();
        StorageReference storageReference = mStorageReference
                .child(filePaths.FIREBASE_IMAGE_STORAGE + "/" + user_id + "/profile_photo");

        //convert image url to bitmap
        if(bm == null){
            bm = com.umo2.players.Utils.ImageManager.getBitmap(imgUrl);
        }

       byte[] bytes = ImageManager.getBytesFromBitmap(bm, 100);

        UploadTask uploadTask = null;
       uploadTask = storageReference.putBytes(bytes);


        uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
            @Override
            public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                String firebaseUrl = Objects.requireNonNull(taskSnapshot.getMetadata().getReference()).getDownloadUrl().toString();

                Toast.makeText(mContext, "photo upload success", Toast.LENGTH_SHORT).show();

                //insert into 'user_account_settings' node
                setProfilePhoto(firebaseUrl.toString());

                ((AccountSettingsActivity)mContext).setViewPager(
                        ((AccountSettingsActivity)mContext).pagerAdapter
                                .getFragmentNumber(mContext.getString(R.string.edit_profile_fragment))
                );

            }
        }).addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                Log.d(TAG, "onFailure: Photo upload failed.");
                Toast.makeText(mContext, "Photo upload failed ", Toast.LENGTH_SHORT).show();
            }
        }).addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() {
            @Override
            public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
                double progress = (100 * taskSnapshot.getBytesTransferred()) / taskSnapshot.getTotalByteCount();

                if(progress - 15 > mPhotoUploadProgress){
                    Toast.makeText(mContext, "photo upload progress: " + String.format("%.0f", progress) + "%", Toast.LENGTH_SHORT).show();
                    mPhotoUploadProgress = progress;
                }

                Log.d(TAG, "onProgress: upload progress: " + progress + "% done");
            }
        });
    }
    }

and lastly my account settings activity

        private void getIncomingIntent(){
    Intent intent = getIntent();

    if(intent.hasExtra(getString(R.string.selected_image))
            || intent.hasExtra(getString(R.string.selected_bitmap))){

        //if there is an imageUrl attached as an extra, then it was chosen from the gallery/photo fragment
        Log.d(TAG, "getIncomingIntent: New incoming imgUrl");
        if(intent.getStringExtra(getString(R.string.return_to_fragment)).equals(getString(R.string.edit_profile_fragment))){

            if(intent.hasExtra(getString(R.string.selected_image))){
                //set the new profile picture
                FirebaseMethods firebaseMethods = new FirebaseMethods(AccountSettingsActivity.this);
                firebaseMethods.uploadNewPhoto(getString(R.string.profile_photo), null, 0,
                        intent.getStringExtra(getString(R.string.selected_image)), null);
            }
            else if(intent.hasExtra(getString(R.string.selected_bitmap))){
                //set the new profile picture
                FirebaseMethods firebaseMethods = new FirebaseMethods(AccountSettingsActivity.this);
                firebaseMethods.uploadNewPhoto(getString(R.string.profile_photo), null, 0,
                        null,(Bitmap) intent.getParcelableExtra(getString(R.string.selected_bitmap)));
            }

        }

    }

    if(intent.hasExtra(getString(R.string.calling_activity))){
        Log.d(TAG, "getIncomingIntent: received incoming intent from " + getString(R.string.profile_activity));
        setViewPager(pagerAdapter.getFragmentNumber(getString(R.string.edit_profile_fragment)));
    }
}

Does this answer your question? [What is a NullPointerException, and how do I fix it?](https://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — Philippe B., Oct 05 '20 at 07:45

Joseph Utulu · Answer 1 · 2020-10-05T09:02:41.563

0

firebaseMethods.uploadNewPhoto(getString(R.string.profile_photo), null, 0,
                    null,(Bitmap) intent.getParcelableExtra(getString(R.string.selected_bitmap)));

You are passing imageUrl as null which is your fourth argument. So fis = new FileInputStream(imageFile); will return null, that is why you are getting the NullPointerException.

Since you are already getting the bitmap as a parcelable extra from the intent, pass the bitmap instead of imageUrl to your getBitmap method so you have this:

getBitmap(Bitmap bitmap) {
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    if (bitmap != null) {
       bitmap.compress(Bitmap.CompressFormat.JPEG, 80, bytes);
    }
    // At this point, you have a compressed bitmap.
}

edited Oct 05 '20 at 09:02

answered Oct 05 '20 at 08:41

Joseph Utulu

236
1
12

how can I solve the problem – Kavea Oct 05 '20 at 08:46
Check the updated answer. – Joseph Utulu Oct 05 '20 at 09:03
I have seen the updated answer but I have not understood where I should place it – Kavea Oct 05 '20 at 09:14
I have done the get bitmap part but I am having an error on the firebase methods //convert image url to bitmap if(bm == null){ bm = com.umo2.players.Utils.ImageManager.getBitmap(imgUrl); } – Kavea Oct 05 '20 at 09:59
please help me out – Kavea Oct 05 '20 at 10:14
What image url do you want to convert to bitmap? – Joseph Utulu Oct 05 '20 at 10:15
images from the gallery let me look for its url – Kavea Oct 05 '20 at 10:21
jQhSITXovpSztggCymgvZD5mCAX2/ – Kavea Oct 05 '20 at 10:28
Print the imgUrl you are passing to com.umo2.players.Utils.ImageManager.getBitmap(imgUrl); and tell me the output – Joseph Utulu Oct 05 '20 at 10:38
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/222524/discussion-between-kavea-and-joseph-utulu). – Kavea Oct 05 '20 at 10:46

I am getting a null pointer caused by boolean bitmap

1 Answers1