Getting Cannot load null bitmap when loading images from gallery

Question

I'm trying to load images from Camera and Gallery to load inside Tensor flow lite model. When loading image from gallery, I'm getting following errors.

2021-01-02 11:48:03.309 9858-9858/com.example.coco_classif E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /storage/emulated/0/Pictures/20200714_135735 (1).jpg: open failed: EACCES (Permission denied)
2021-01-02 11:48:03.332 9858-9858/com.example.coco_classif E/Error log: java.lang.NullPointerException: Cannot load null bitmap.

NOTE: Issues seems coming from the try catch block, loading from camera works fine

mainfest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.coco_classif">
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Coco_classif">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Main Activity

package com.example.coco_classif;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.Manifest;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.Image;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Toast;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

public class MainActivity extends AppCompatActivity {

    private static final int CAMERA_PERMISSION_REQUEST_CODE = 1000;
    private static final int CAMERA_REQUEST_CODE = 10001;
    private ImageView imageView;
    private ListView listView;
    private ImageClassifier imageClassifier;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        inaializeUIElements(); 
    }

    private void inaializeUIElements() {
        imageView = findViewById(R.id.iv_capture);
        listView = findViewById(R.id.lv_probabilities);
        Button takepicture = findViewById(R.id.bt_take_picture);

        try {
            imageClassifier = new ImageClassifier(this);
        } catch (IOException e) {
            Log.e("Error While Creating Image Classifier", "Error" +e);
        }

        takepicture.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(hasPermission()) {
                    selectImage();
                }else{
                    requestPermission();
                }
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        if (resultCode == RESULT_OK) {
            if (requestCode == 1) {
                Bitmap photo = (Bitmap) Objects.requireNonNull(Objects.requireNonNull(data).getExtras()).get("data");
            imageView.setImageBitmap(photo);

            List<ImageClassifier.Recognition> predictions = imageClassifier.recognizeImage(photo, 0);

            final List<String> predictionList = new ArrayList<>();
            for(ImageClassifier.Recognition recog: predictions){
                predictionList.add("Label: " + recog.getName() + "Confidence: " + recog.getConfidance());
            }

            ArrayAdapter<String> predictionsAdapter = new ArrayAdapter<>(
                    this,R.layout.support_simple_spinner_dropdown_item,predictionList);

            listView.setAdapter(predictionsAdapter);

        }

            else if (requestCode == 2) {
                try {
                    Uri selectedImage = data.getData();
                    String[] filePath = new String[]{MediaStore.Images.Media.DATA};
                    Cursor c = getContentResolver().query(selectedImage,filePath, null, null, null);
                    c.moveToFirst();
                    int columnIndex = c.getColumnIndex(filePath[0]);
                    String picturePath = c.getString(columnIndex);
                    c.close();
                    Bitmap thumbnail = (BitmapFactory.decodeFile(picturePath));
                    Log.w("path of image from gallery......******************.........", picturePath+"");
                    Toast.makeText(this,picturePath.toString(),Toast.LENGTH_LONG).show();


                    imageView.setImageBitmap(thumbnail);

                    List<ImageClassifier.Recognition> predictions = imageClassifier.recognizeImage(thumbnail, 0);

                    final List<String> predictionList = new ArrayList<>();
                    for(ImageClassifier.Recognition recog: predictions){
                        predictionList.add("Label: " + recog.getName() + "Confidence: " + recog.getConfidance());
                    }

                    ArrayAdapter<String> predictionsAdapter = new ArrayAdapter<>(
                            this,R.layout.support_simple_spinner_dropdown_item,predictionList);

                    listView.setAdapter(predictionsAdapter);




                }catch (Exception e){

                    Toast.makeText(this,e.toString(),Toast.LENGTH_LONG).show();
                    Log.e("Error log", e.toString());
                }

            }


        }

        super.onActivityResult(requestCode, resultCode, data);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if(hasAllPermissions(grantResults)){
            openCamera();
        }else {
            requestPermission();
        }
    }

    private boolean hasAllPermissions(int[] grantResults) {
        for(int result : grantResults){
            if (result == PackageManager.PERMISSION_DENIED)
                return false;
        }
        return true;
    }

    private void requestPermission() {
        if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.M){
            if(shouldShowRequestPermissionRationale(Manifest.permission.CAMERA)){
                Toast.makeText(this," Permission required",Toast.LENGTH_SHORT).show();
            }
            requestPermissions(new String[]{Manifest.permission.CAMERA}, CAMERA_PERMISSION_REQUEST_CODE);
        }
    }

    private void openCamera() {
        Intent camerIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(camerIntent,CAMERA_REQUEST_CODE);
    }

    private boolean hasPermission() {
       if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.M){
           return checkSelfPermission(Manifest.permission.CAMERA)== PackageManager.PERMISSION_GRANTED;
       }
       return true;
    }

    private void selectImage() {
        final CharSequence[] options = {"Take Photo", "Choose from Gallery", "Cancel"};
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setTitle("Add Photo!");
        builder.setItems(options, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int item) {
                if (options[item].equals("Take Photo")) {
                    Intent camerIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    startActivityForResult(camerIntent,1);
                } else if (options[item].equals("Choose from Gallery")) {
                    Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                    startActivityForResult(intent, 2);

                } else if (options[item].equals("Cancel")) {
                    dialog.dismiss();
                }
            }
        });
        builder.show();
    }
    }

you are getting this error because of permission issue, please add read external storage permission as well — Rajendra Mahato, Jan 02 '21 at 07:43

score 1 · Accepted Answer · answered Jan 02 '21 at 08:32

Note: This code snippet worked for only writing a text file and I used this method to solve open failed: EACCES (Permission denied)

I know your Implementation has to deal with images and that is causing this 2021-01-02 11:48:03.332 9858-9858/com.example.coco_classif E/Error log: java.lang.NullPointerException: Cannot load null bitmap.

Also, check out this Exception 'open failed: EACCES (Permission denied)' on Android

I had the exact same problem, all I did was create a directory and write a text file in it.

Also, it is a good practice to create a new filename for images programmatically, use the Date formatter.

As I can see you are using an alert dialog to select images, I suggest you should not do it that way, alert dialog causes a lot of synchronization problems.

This code is tested on android Q One Plus 6t works fine without any errors.

public void generateNoteOnSD(Context context, String sFileName, String sBody) {
    try {
        File root = new File(String.valueOf(Environment.getExternalStorageDirectory())+"/sysInfoReports");
        if (!root.exists()) {
            root.mkdirs();
        }
        File gpxfile = new File(root, sFileName);
        FileWriter writer = new FileWriter(gpxfile);
        writer.append(sBody);
        writer.flush();
        writer.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

Check you permissions : Old storage permissions do not work on Android R.

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" tools:ignore="ScopedStorage" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

Getting Cannot load null bitmap when loading images from gallery

1 Answers1