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会社のサーバーに画像をアップロードするアプリを構築しています 複数の画像を取得して PDF に変換し、同じドキュメントの一部である画像をまとめて保存できるようにしています

私の問題は、PDF作成に複数の画像を追加できるように、それを作成する方法がわからないことです。私はAndroidライブラリPhotoUtilsを使用しています。

現時点では単一の画像が機能しますが、複数の画像を選択するとnull Pointer例外が発生します

メインコード

public class PdfMake extends AppCompatActivity {
    private final int PICK_IMAGE=12345;
    private final int REQUEST_CAMERA=6352;
    CameraPhoto cameraPhoto;
    GalleryPhoto galleryPhoto;
    String selectedPhoto;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        StrictMode.VmPolicy.Builder builder4=new StrictMode.VmPolicy.Builder();
        StrictMode.setVmPolicy(builder4.build());
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_pdf_make);
        Button fromCamera=findViewById(R.id.SelectImages2);
        Button PdfMake=findViewById(R.id.button4);

        fromCamera.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showPictureDialog();
            }
        });
        PdfMake.setOnClickListener(new View.OnClickListener() {
            @RequiresApi(api=Build.VERSION_CODES.KITKAT)
            @Override
            public void onClick(View v) {
                try {
                    createPdf();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
    }
        private void showPictureDialog () {
            AlertDialog.Builder pictureDialog=new AlertDialog.Builder(this);
            pictureDialog.setTitle("Select Action");
            String[] pictureDialogItems={
                    "Select photo from gallery",
                    "Capture photo from camera"};
            pictureDialog.setItems(pictureDialogItems,
                    new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            switch (which) {
                                case 0:
                                    getImageFromGallery();
                                    break;
                                case 1:
                                    try {
                                        getImageFromCamera();
                                    } catch (IOException e) {
                                        e.printStackTrace();
                                    }
                                    break;

                            }
                        }
                    });

        }




    @RequiresApi(api=Build.VERSION_CODES.KITKAT)
    private void createPdf() throws IOException {
        // create a new document
        PdfDocument document=new PdfDocument();
        // crate a page description
        PdfDocument.PageInfo pageInfo=new PdfDocument.PageInfo.Builder(3000, 6000, 1).create();
        // start a page
        PdfDocument.Page page=document.startPage(pageInfo);
        Canvas canvas=page.getCanvas();
        Bitmap image=BitmapFactory.decodeFile(selectedPhoto);
        canvas.drawBitmap(image, 10, 10, null);

        document.finishPage(page);
        String directory_path=Environment.getExternalStorageDirectory().getPath() + "/mypdf/";
        File file=new File(directory_path);
        if (!file.exists()) {
            file.mkdirs();
        }
        String targetPdf=directory_path + "test-2.pdf";
        File filePath=new File(targetPdf);
        try {
            document.writeTo(new FileOutputStream(filePath));
            Toast.makeText(this, "Done", Toast.LENGTH_LONG).show();
        } catch (IOException e) {
            Log.e("main", "error " + e.toString());
            Toast.makeText(this, "Something wrong: " + e.toString(), Toast.LENGTH_LONG).show();
        }
        // close the document
        document.close();
    }



        private void getImageFromCamera () throws IOException {

            cameraPhoto=new CameraPhoto(getApplicationContext());
            Intent in=cameraPhoto.takePhotoIntent();
            startActivityForResult(in, REQUEST_CAMERA);
            Bungee.split(PdfMake.this);

        }

        private void getImageFromGallery () {

        Intent intent=new Intent();
            intent.setType("image/*");
            intent.setAction(Intent.ACTION_GET_CONTENT);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
                intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
            }
            if (intent.resolveActivity(getPackageManager()) != null) {
                startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE);
                Bungee.split(PdfMake.this);

            }
        }


protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) {
        if (requestCode == REQUEST_CAMERA) {


        String photoPath=cameraPhoto.getPhotoPath();
        selectedPhoto=photoPath;
        try {
        Bitmap bitmap=ImageLoader.init().from(photoPath).requestSize(512, 512).getBitmap();
        } catch (FileNotFoundException e) {
        Toasty.error(getApplicationContext(),
        "Something Wrong while loading photos", Toast.LENGTH_SHORT).show();
        }

        } else if (requestCode == PICK_IMAGE) {
        Uri uri=data.getData();

        galleryPhoto.setPhotoUri(uri);
        String photoPath=galleryPhoto.getPath();
        selectedPhoto=photoPath;
        try {
        Bitmap bitmap=ImageLoader.init().from(photoPath).requestSize(512, 512).getBitmap();
        } catch (FileNotFoundException e) {
        Toasty.error(getApplicationContext(),
        "Something Wrong while choosing photos", Toast.LENGTH_SHORT).show();
        }
        }
        }
        }
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        int CAMERA_RESULT=11100;
        if(requestCode == CAMERA_RESULT){
        if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED){
        try {
        getImageFromCamera();
        } catch (IOException e) {
        e.printStackTrace();
        }
        }
        else{
        Toasty.error(getApplicationContext(), "Permission Needed.", Toast.LENGTH_LONG).show();
        }
        }
        else {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }
        if(requestCode == PICK_IMAGE){
        if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED){
        getImageFromGallery();
        }
        else{
        Toasty.error(getApplicationContext(), "Permission Needed.", Toast.LENGTH_LONG).show();
        }
        }
        else {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }
        }
}

ギャラリー画像のコード

public class GalleryPhoto {
    final String TAG = this.getClass().getSimpleName();
    private Context context;
    private Uri photoUri;

    public void setPhotoUri(Uri photoUri) {
        this.photoUri = photoUri;
    }

    public GalleryPhoto(Context context) {
        this.context = context;
    }

    public Intent openGalleryIntent() {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction("android.intent.action.GET_CONTENT");
        return Intent.createChooser(intent, this.getChooserTitle());
    }

    public String getChooserTitle() {
        return "Select Pictures";
    }

    public String getPath() {
        String path;
        if (VERSION.SDK_INT < 11) {
            path = RealPathUtil.getRealPathFromURI_BelowAPI11(this.context, this.photoUri);
        } else if (VERSION.SDK_INT < 19) {
            path = RealPathUtil.getRealPathFromURI_API11to18(this.context, this.photoUri);
        } else {
            path = RealPathUtil.getRealPathFromURI_API19(this.context, this.photoUri);
        }

        return path;
    }
}

カメラ画像のコード

public class CameraPhoto {
    final String TAG = this.getClass().getSimpleName();
    private String photoPath;
    private Context context;

    public String getPhotoPath() {
        return this.photoPath;
    }

    public CameraPhoto(Context context) {
        this.context = context;
    }

    public Intent takePhotoIntent() throws IOException {
        Intent in = new Intent("android.media.action.IMAGE_CAPTURE");
        if (in.resolveActivity(this.context.getPackageManager()) != null) {
            File photoFile = this.createImageFile();
            if (photoFile != null) {
                in.putExtra("output", Uri.fromFile(photoFile));
            }
        }

        return in;
    }

    private File createImageFile() throws IOException {
        String timeStamp = (new SimpleDateFormat("yyyyMMdd_HHmmss")).format(new Date());
        String imageFileName = "JPEG_" + timeStamp + "_";
        File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
        File image = File.createTempFile(imageFileName, ".jpg", storageDir);
        this.photoPath = image.getAbsolutePath();
        return image;
    }

    public void addToGallery() {
        Intent mediaScanIntent = new Intent("android.intent.action.MEDIA_SCANNER_SCAN_FILE");
        File f = new File(this.photoPath);
        Uri contentUri = Uri.fromFile(f);
        mediaScanIntent.setData(contentUri);
        this.context.sendBroadcast(mediaScanIntent);
    }
}
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