app/build.gradle.kts

@@ -26,8 +26,8 @@ android {
         }
     }
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_17
+        sourceCompatibility = JavaVersion.VERSION_1_8
-        targetCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_1_8
     }
 }
 
@@ -50,9 +50,4 @@ dependencies {
 
     // optional - Guava support for Room, including Optional and ListenableFuture
     implementation("androidx.room:room-guava:$room_version")
-
-    implementation("io.jenetics:jpx:3.1.0")
-    // https://mvnrepository.com/artifact/org.codehaus.woodstox/woodstox-core-asl
-    implementation("org.codehaus.woodstox:woodstox-core-asl:4.4.1")
-
 }

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

@@ -9,7 +9,6 @@ import android.location.LocationListener;
 import android.os.Bundle;
 import android.os.IBinder;
 import android.util.Log;
-import android.widget.Button;
 import android.widget.TextView;
 
 import androidx.activity.EdgeToEdge;
@@ -19,27 +18,13 @@ import androidx.core.graphics.Insets;
 import androidx.core.view.ViewCompat;
 import androidx.core.view.WindowInsetsCompat;
 
-import java.io.IOException;
-import java.io.OutputStream;
-import java.io.OutputStreamWriter;
-import java.io.PipedInputStream;
-import java.io.PipedOutputStream;
-import java.io.Writer;
-
-import io.jenetics.jpx.GPX;
-import io.jenetics.jpx.WayPoint;
-
 public class MainActivity extends AppCompatActivity implements LocationListener, ServiceConnection {
     private final String TAG = MainActivity.class.getName();
-    private Button exportButton;
-    private WriteToFile writeToFile;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        writeToFile = new WriteToFile(this,"application/gpx");
-
         Intent serviceIntent = new Intent(this, LocationLoggingService.class);
         startForegroundService(serviceIntent);
 
@@ -50,8 +35,6 @@ public class MainActivity extends AppCompatActivity implements LocationListener,
             v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom);
             return insets;
         });
-
-        exportButton = findViewById(R.id.buttonExport);
     }
 
     @Override
@@ -86,73 +69,6 @@ public class MainActivity extends AppCompatActivity implements LocationListener,
 
         LocationLoggingServiceBinder binder = (LocationLoggingServiceBinder) iBinder;
         binder.subscribeToLocationUpdates(this);
-
-        if(exportButton != null){
-            exportButton.setOnClickListener(v -> {
-                Log.d(TAG, "Export button clicked.");
-                new Thread(() -> {
-                    GPX gpx = GPX.builder().addTrack(track -> track.addSegment(segment -> {
-                        for(LocationEntity location : binder.allLocations()){
-                            segment.addPoint(locationToWayPoint(location));
-                        }
-                    })).build();
-                    Log.d(TAG, "Built GPX.");
-
-                    writeToFile.write("output.gpx", outputStream -> {
-                        try {
-                        GPX.Writer.of(GPX.Writer.Indent.SPACE4).write(gpx, outputStream);
-                        } catch (IOException e) {
-                            Log.e(TAG, "Failed to write.");
-                        }
-                    });
-                }).start();
-            });
-        }
-    }
-
-    private static WayPoint locationToWayPoint(LocationEntity location) {
-        WayPoint.Builder builder = WayPoint.builder()
-                .lat(location.latitude)
-                .lon(location.longitude)
-                .time(location.unixTime);
-
-        if(location.speed != null){
-            builder.speed(location.speed);
-        }
-
-        if(location.bearing != null){
-            builder.course(location.bearing);
-        }
-
-        if(location.altitude != null){
-            builder.ele(location.altitude);
-        }
-
-        StringBuilder commentBuilder = new StringBuilder();
-
-        if(location.isMock){
-            commentBuilder.append("Location is mock.\n");
-        }
-
-        if(location.accuracy != null){
-            commentBuilder.append(String.format("Accuracy is expected to be within %s meters.\n", location.accuracy));
-        }
-
-        if(location.altitudeAccuracy != null){
-            commentBuilder.append(String.format("Altitude accuracy is expected to be within %s meters.\n", location.altitudeAccuracy));
-        }
-
-        if(location.bearingAccuracy != null){
-            commentBuilder.append(String.format("Bearing accuracy is expected to be within %s degrees.\n", location.bearingAccuracy));
-        }
-
-        if(location.speedAccuracy != null){
-            commentBuilder.append(String.format("Speed accuracy is expected to be within %s meters per second.\n", location.speedAccuracy));
-        }
-
-        builder.cmt(commentBuilder.toString());
-
-        return builder.build();
     }
 
     @Override

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

@@ -1,5 +1,6 @@
 package com.proculite.logmylocation;
 
+import android.content.Context;
 import android.net.Uri;
 import android.os.ParcelFileDescriptor;
 import android.util.Log;
@@ -8,22 +9,30 @@ 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.util.function.Consumer;
+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 Consumer<OutputStream> fileConsumer;
+    private final InputStream fileContents;
     private final AppCompatActivity activityCompat;
-    private final ActivityResultLauncher<String> launcher;
 
-    public WriteToFile(AppCompatActivity activity, String fileMimeType)
+    public WriteToFile(AppCompatActivity activity, String fileName, String fileMimeType, InputStream fileContents)
     {
+        this.fileContents = fileContents;
         this.activityCompat = activity;
-        this.launcher = activity.registerForActivityResult(
+        ActivityResultLauncher<String> launcher =
-                new ActivityResultContracts.CreateDocument(fileMimeType), this);
+                activity.registerForActivityResult(new ActivityResultContracts.CreateDocument(fileMimeType), this);
+        launcher.launch(fileName);
     }
 
     @Override
@@ -43,7 +52,9 @@ public class WriteToFile implements ActivityResultCallback<Uri> {
                     return;
                 }
                 try (FileOutputStream fileOutputStream = new FileOutputStream(fileDescriptor.getFileDescriptor())) {
-                    fileConsumer.accept(fileOutputStream);
+                    while (fileContents.available() > 0) {
+                        fileOutputStream.write(fileContents.read());
+                    }
                 }
             }
         }  catch (IOException e) {
@@ -51,8 +62,11 @@ public class WriteToFile implements ActivityResultCallback<Uri> {
         }
     }
 
-    public void write(String fileName, Consumer<OutputStream> fileConsumer){
+    public static WriteToFile WriteBytes(AppCompatActivity activity, String fileName, String fileMimeType, byte[] fileContents){
-        this.fileConsumer = fileConsumer;
+        return new WriteToFile(activity, fileName, fileMimeType, new ByteArrayInputStream(fileContents));
-        launcher.launch(fileName);
+    }
+
+    public static WriteToFile WriteString(AppCompatActivity activity, String fileName, String fileMimeType, String fileContents){
+        return WriteBytes(activity, fileName, fileMimeType, fileContents.getBytes(StandardCharsets.UTF_8));
     }
 }

app/src/main/res/layout/activity_main.xml

@@ -18,13 +18,4 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
-    <Button
-        android:id="@+id/buttonExport"
-        app:layout_constraintTop_toBottomOf="@+id/textViewMain"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        android:text="Export"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content" />
-
 </androidx.constraintlayout.widget.ConstraintLayout>