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Add exporting of collected LocationDataSamples
The collected LocationDataSamples are exported to a CSV file using the CSVFileExporter class.
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165 changes: 165 additions & 0 deletions
165
...app/src/main/java/fi/akahukas/projects/geospatial_maps/location_data/CSVFileExporter.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,165 @@ | ||
| /* | ||
| ---------- THIS FILE WAS CREATED BY SAKU HAKAMÄKI ---------- | ||
| */ | ||
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| package fi.akahukas.projects.geospatial_maps.location_data; | ||
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| import static androidx.core.app.ActivityCompat.startActivityForResult; | ||
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| import android.app.Activity; | ||
| import android.content.Intent; | ||
| import android.net.Uri; | ||
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| import androidx.annotation.NonNull; | ||
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| import com.opencsv.CSVWriter; | ||
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| import java.io.OutputStream; | ||
| import java.io.OutputStreamWriter; | ||
| import java.nio.charset.StandardCharsets; | ||
| import java.time.LocalTime; | ||
| import java.util.ArrayList; | ||
| import java.util.Arrays; | ||
| import java.util.List; | ||
| import java.util.Locale; | ||
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| /** | ||
| * Class responsible for creating and writing data held by | ||
| * collected LocationDataSamples to CSV files. | ||
| */ | ||
| public class CSVFileExporter { | ||
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| private Activity startActivity_; | ||
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| private final int CREATE_FILE_CODE = 1; | ||
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| private final String DEFAULT_FILE_TYPE = "text/csv"; | ||
| private final String DEFAULT_FILENAME = "geospatial_samples.csv"; | ||
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| /** | ||
| * Constructor method. | ||
| * | ||
| * @param startActivity The Activity where the system file | ||
| * picker is launched from. | ||
| */ | ||
| public CSVFileExporter(Activity startActivity) { | ||
| this.startActivity_ = startActivity; | ||
| } | ||
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| /** | ||
| * Starts the Android system file picker to allow the user | ||
| * to select a location where to write the contents of the | ||
| * CSV file. | ||
| * | ||
| * @return The request code that is returned in | ||
| * onActivityResult() method of start Activity when the | ||
| * system file picker exits. | ||
| */ | ||
| public int createFile() { | ||
| Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT); | ||
| intent.addCategory(Intent.CATEGORY_OPENABLE); | ||
| intent.setType(DEFAULT_FILE_TYPE); | ||
| intent.putExtra(Intent.EXTRA_TITLE, DEFAULT_FILENAME); | ||
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| startActivityForResult(this.startActivity_, intent, CREATE_FILE_CODE, null); | ||
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| return CREATE_FILE_CODE; | ||
| } | ||
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| /** | ||
| * Writes the collected LocationDataSamples to the CSV file | ||
| * created in {@link #createFile()} method. | ||
| * | ||
| * @param uri The URI of the created CSV file. | ||
| * @param sampleSets The collected LocationDataSamples. | ||
| * @return True if the write was successful, False otherwise. | ||
| */ | ||
| public boolean writeToFile(@NonNull Uri uri, @NonNull ArrayList<ArrayList<LocationDataSample>> sampleSets) { | ||
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| try (OutputStream out = startActivity_.getContentResolver().openOutputStream(uri); | ||
| OutputStreamWriter writer = new OutputStreamWriter(out, StandardCharsets.UTF_8)) { | ||
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| CSVWriter csvWriter = new CSVWriter(writer); | ||
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| csvWriter.writeAll( | ||
| formatOutputData(sampleSets) | ||
| ); | ||
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| return true; | ||
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| } catch (Exception e) { | ||
| e.printStackTrace(); | ||
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| return false; | ||
| } | ||
| } | ||
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| /** | ||
| * Edits the collected LocationDataSamples to a format | ||
| * which is expected in the output CSV file. | ||
| * | ||
| * @param sampleSets The collected LocationDataSamples. | ||
| * @return The content to be written to the output CSV | ||
| * file in a List of String Arrays. | ||
| */ | ||
| private List<String[]> formatOutputData(ArrayList<ArrayList<LocationDataSample>> sampleSets) { | ||
| List<String[]> data = new ArrayList<String[]>(); | ||
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| // Header row. | ||
| data.add(new String[] { | ||
| "Set ID", | ||
| "Sample ID", | ||
| "Timestamp (hh:mm:ss:sss)", | ||
| "Latitude (degrees)", | ||
| "Longitude (degrees)", | ||
| "Horizontal Accuracy (metres)", | ||
| "Altitude (metres)", | ||
| "Vertical Accuracy (metres)", | ||
| "Quaternion", | ||
| "Yaw Accuracy (degrees)" | ||
| }); | ||
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| for (int i = 0; i < sampleSets.size(); i++) { | ||
| ArrayList<LocationDataSample> set = sampleSets.get(i); | ||
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| for (int j = 0; j < set.size(); j++) { | ||
| LocationDataSample sample = set.get(j); | ||
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| // One row for each LocationDataSample. | ||
| data.add(new String[] { | ||
| String.valueOf(i + 1), // Start from 1 | ||
| String.valueOf(j + 1), // Start from 1 | ||
| formatTimestamp(sample.getTimestamp()), | ||
| String.valueOf(sample.getLatitude()), | ||
| String.valueOf(sample.getLongitude()), | ||
| String.valueOf(sample.getHorizontalAccuracy()), | ||
| String.valueOf(sample.getAltitude()), | ||
| String.valueOf(sample.getVerticalAccuracy()), | ||
| Arrays.toString(sample.getQuaternion()), | ||
| String.valueOf(sample.getOrientationYawAccuracy()) | ||
| }); | ||
| } | ||
| } | ||
| return data; | ||
| } | ||
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| /** | ||
| * Formats a LocalTime object to a format which is | ||
| * expected in the output CSV file. | ||
| * | ||
| * @param timestamp The LocalTime object to format. | ||
| * @return The formatted time as String in format | ||
| * hh:mm:ss:sss. | ||
| */ | ||
| private String formatTimestamp(LocalTime timestamp) { | ||
| return String.format( | ||
| Locale.ENGLISH, | ||
| "%02d:%02d:%02d:%d", | ||
| timestamp.getHour(), | ||
| timestamp.getMinute(), | ||
| timestamp.getSecond(), | ||
| (timestamp.getNano() / 1000000) | ||
| ); | ||
| } | ||
| } |
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