Android studio gets strange filename and throws the error "File not found"

Question

I am currently working on my pet project. The plot is next: user can chose 2 different files and compare them by hashsum. The main problem is that I cannot read file because of this annoying filenames like "image/9", that causes the problem with file reading. I will be very appreciated for our help.

This is main Java code

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MainActivity extends AppCompatActivity {

    String current = "file1";
    String hash1 = " ";
    String hash2 = " ";

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

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 0);
            }
        }
    }

    private void getHashDigest(String path) throws IOException {
        File sdcard = Environment.getExternalStorageDirectory();
        File file = new File(sdcard, path.split(":")[1]);

        int k = 0;
        byte[] digest = null;
        try {
            byte fileData;
            MessageDigest messageDigest = MessageDigest.getInstance("SHA-512");

            DataInputStream dis = new DataInputStream(new FileInputStream(file.getAbsolutePath()));

            while (dis.available() > 0) {
                fileData = dis.readByte();
                messageDigest.update(fileData);
                k++;
            }

            dis.close();
            digest = messageDigest.digest();

            if (this.current == "file1") {
                hash1 = digest.toString();
            } else {
                hash2 = digest.toString();
            }
        } catch (IOException e) {
            Log.e("Error!", e.toString());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        EditText tv = (EditText) findViewById(R.id.file1);

        if (this.current == "file2") {
            tv = (EditText) findViewById(R.id.file2);
        }

        if (requestCode == 1 && resultCode == RESULT_OK) {
            Uri selectedFile = data.getData();
            tv.setText(selectedFile.getPath());
            try {
                this.getHashDigest(selectedFile.getPath());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

    private void compare(){
        EditText tv = (EditText) findViewById(R.id.results);
        tv.setText(hash1 == hash2 ? "Matched!" : "Not Matched!");
    }

    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.getFile1:
                this.getFile("file1");
                break;
            case R.id.getFile2:
                this.getFile("file2");
                break;
            case R.id.calc:
                compare();
                break;
        }
    }

    private void getFile(String id) {
        Intent intent = new Intent()
                .setType("*/*")
                .setAction(Intent.ACTION_GET_CONTENT);

        this.current = id;
        startActivityForResult(Intent.createChooser(intent, "Select file"), 1);
    }
} 

And this is my XML markup

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        tools:layout_editor_absoluteX="57dp"
        tools:layout_editor_absoluteY="229dp"
        android:padding="25dp">

        <TextView
            android:layout_width="wrap_content"
            android:text="File 1:"
            android:layout_height="wrap_content"
            android:textSize="25sp"
            android:layout_marginTop="15dp">
        </TextView>
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="25sp"
            android:inputType="numberDecimal"
            android:id="@+id/file1">
        </EditText>

        <Button
            android:layout_height="60dp"
            android:layout_width="match_parent"
            android:padding="10dp"
            android:text="Choose file 1"
            android:layout_marginTop="15dp"
            android:id="@+id/getFile1"
            android:onClick="onClick"
            >
        </Button>

        <TextView
            android:layout_width="wrap_content"
            android:text="File 2:"
            android:layout_height="wrap_content"
            android:textSize="25sp"
            android:layout_marginTop="15dp"
            >
        </TextView>

        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="25sp"
            android:inputType="numberDecimal"
            android:id="@+id/file2">
        </EditText>

        <Button
            android:layout_height="60dp"
            android:layout_width="match_parent"
            android:padding="10dp"
            android:text="Choose file 2"
            android:layout_marginTop="15dp"
            android:id="@+id/getFile2"
            android:onClick="onClick"
            >
        </Button>

        <Button
            android:layout_height="60dp"
            android:layout_width="match_parent"
            android:padding="10dp"
            android:text="Calculate"
            android:layout_marginTop="15dp"
            android:id="@+id/calc"
            >
        </Button>
        <TextView
            android:layout_width="wrap_content"
            android:text="Results:"
            android:layout_height="wrap_content"
            android:textSize="25sp"
            android:layout_marginTop="15dp">
        </TextView>
        <EditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textSize="25sp"
            android:inputType="numberDecimal"
            android:id="@+id/results">
        </EditText>
    </LinearLayout>

Please help me, because I am out of ideas!