Created WriteTofile helper class.

app/src/main/java/com/proculite/logmylocation/WriteToFile.java

@@ -0,0 +1,72 @@
+package com.proculite.logmylocation;
+
+import android.content.Context;
+import android.net.Uri;
+import android.os.ParcelFileDescriptor;
+import android.util.Log;
+
+import androidx.activity.result.ActivityResultCallback;
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.activity.result.contract.ActivityResultContracts;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.app.ActivityCompat;
+
+import java.io.ByteArrayInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+public class WriteToFile implements ActivityResultCallback<Uri> {
+    private final String TAG = WriteToFile.class.getName();
+    private final InputStream fileContents;
+    private final AppCompatActivity activityCompat;
+
+    public WriteToFile(AppCompatActivity activity, String fileName, String fileMimeType, InputStream fileContents)
+    {
+        this.fileContents = fileContents;
+        this.activityCompat = activity;
+        ActivityResultLauncher<String> launcher =
+                activity.registerForActivityResult(new ActivityResultContracts.CreateDocument(fileMimeType), this);
+        launcher.launch(fileName);
+    }
+
+    @Override
+    public void onActivityResult(Uri o) {
+        if(o == null || o.getPath() == null)
+        {
+            Log.d(TAG, "Attempting to write to null path.");
+            return;
+        }
+
+        Log.d(TAG, String.format("Writing to file: %s", o.getPath()));
+
+        try {
+            try (ParcelFileDescriptor fileDescriptor = this.activityCompat.getContentResolver().openFileDescriptor(o, "w")) {
+                if (fileDescriptor == null) {
+                    Log.e(TAG, "Parcel file descriptor is null.");
+                    return;
+                }
+                try (FileOutputStream fileOutputStream = new FileOutputStream(fileDescriptor.getFileDescriptor())) {
+                    while (fileContents.available() > 0) {
+                        fileOutputStream.write(fileContents.read());
+                    }
+                }
+            }
+        }  catch (IOException e) {
+            Log.e(TAG, "Failed to write to file.");
+        }
+    }
+
+    public static WriteToFile WriteBytes(AppCompatActivity activity, String fileName, String fileMimeType, byte[] fileContents){
+        return new WriteToFile(activity, fileName, fileMimeType, new ByteArrayInputStream(fileContents));
+    }
+
+    public static WriteToFile WriteString(AppCompatActivity activity, String fileName, String fileMimeType, String fileContents){
+        return WriteBytes(activity, fileName, fileMimeType, fileContents.getBytes(StandardCharsets.UTF_8));
+    }
+}