mainActivity.java

package com.mwb.digitalstorage;

import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import com.mwb.digitalstorage.command_handlers.ToolbarCmdHandler;
import com.mwb.digitalstorage.misc.ImageProcessor;

import java.util.concurrent.Executor;
import java.util.concurrent.Executors;

import androidx.appcompat.app.AppCompatActivity;
import androidx.databinding.BindingAdapter;


public class MainActivity extends AppCompatActivity
{
    static int RESULT_LOAD_IMAGE = 1;

    protected Executor executor = Executors.newSingleThreadExecutor();
    protected ImageProcessor imgProcessor = new ImageProcessor();

    //
    //  command handler for the toolbar
    //
    public ToolbarCmdHandler getToolbarCmdHandler(String nameOfPrevious, long idOfPrevious)
    {
        return new ToolbarCmdHandler()
        {
            @Override
            public void openSearchActivity()
            {
                Intent intent = new Intent(MainActivity.this, SearchActivity.class);
                intent.putExtra("previous_activity_id", idOfPrevious);
                intent.putExtra("previous_activity_name", nameOfPrevious);

                overridePendingTransition(android.R.anim.slide_in_left, android.R.anim.slide_out_right);
            }
        };
    }

    @BindingAdapter("android:layout_height")
    public static void setLayoutHeight(View view, float height)
    {
        ViewGroup.LayoutParams layoutParams = view.getLayoutParams();
        layoutParams.height = Math.round(height);
        view.setLayoutParams(layoutParams);
    }

    //
    //  loadImg will be called on AS SOON AS
    //  the ViewModel property bound to imgSrc is called on
    //
    @BindingAdapter({"app:customSrc"})
    public static void loadImg(ImageView view, Bitmap imgBitmap)
    {
        view.setImageBitmap(imgBitmap);
    }
}

RegistrationActivity.java

package com.mwb.digitalstorage;

import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Environment;

import com.mwb.digitalstorage.command_handlers.RegistrationCmdHandler;
import com.mwb.digitalstorage.database.CompanyRepository;
import com.mwb.digitalstorage.databinding.ActivityMainBinding;
import com.mwb.digitalstorage.misc.ImageProcessor;
import com.mwb.digitalstorage.viewmodel.CompanyRegistrationViewModel;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.databinding.DataBindingUtil;
import androidx.lifecycle.ViewModelProviders;


public class RegistrationActivity extends MainActivity
{
    private CompanyRegistrationViewModel companyRegistrationVM;


    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        checkPermissions();

        companyRegistrationVM = new CompanyRegistrationViewModel(new CompanyRepository(getApplication()));

        checkExistence();

        ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        RegistrationCmdHandler registrationCmdHandler = registrationCmdHandler();
        binding.setVm(companyRegistrationVM);
        binding.setCmdHandler(registrationCmdHandler);
    }

    //
    //  checks for permissions
    //
    private void checkPermissions()
    {
        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {

            if (ActivityCompat.shouldShowRequestPermissionRationale((Activity)
                    this, Manifest.permission.READ_EXTERNAL_STORAGE)) {


            } else {
                ActivityCompat.requestPermissions((Activity) this,
                        new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                        200);
                ActivityCompat.requestPermissions((Activity) this,
                        new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                        200);
            }

        }
    }

    //
    //  checks if there is already a company existing
    //
    private void checkExistence()
    {
        executor.execute(() ->
        {
            if (companyRegistrationVM.getCompany() != null)
            {
                switchActivity();
            }
        });
    }

    //
    //  registration activity handler
    //
    public RegistrationCmdHandler registrationCmdHandler()
    {
        return new RegistrationCmdHandler()
        {
            @Override
            public void takePhoto()
            {
                imgProcessor.setCamerabool(true);
                startActivityForResult(imgProcessor.dispatchTakePictureIntent(getApplicationContext(),
                                        getExternalFilesDir(Environment.DIRECTORY_PICTURES)), 1);
            }
            @Override
            public void browsePhoto()
            {
                imgProcessor.setCamerabool(false);
                startActivityForResult(new Intent(
                        Intent.ACTION_PICK,
                        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI),1);
            }
            @Override
            public void removePhoto() { companyRegistrationVM.companyImgObsv.set(null); }
            @Override
            public void registerCompany()
            {
                executor.execute(() ->
                {
                    companyRegistrationVM.addCompany();
                    switchActivity();
                });
            }
        };
    }

    //
    //  immediately retrieves file from taken img
    //  sets the VM img resource property
    //  loadImg will be called on after trigger of set()
    //
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data)
    {
        if (imgProcessor.isFromCamera())
        {
            companyRegistrationVM.setCompanyBitmap(imgProcessor.getImgPath());
        }
        else
        {
            companyRegistrationVM.companyImgObsv.set(imgProcessor.browseImage(data, getApplication()));
        }
    }

    //
    //  switches activity
    //
    public void switchActivity()
    {
        Intent intent = new Intent(RegistrationActivity.this, StorageOverViewActivity.class);
        startActivity(intent);
        overridePendingTransition(android.R.anim.fade_out, android.R.anim.fade_in);
    }
}