Cleanup: static code analysis using AndroidStudio.

src/main/java/de/dennisguse/opentracks/io/file/exporter/ExportActivity.java

@@ -63,9 +63,7 @@ public class ExportActivity extends FragmentActivity implements ExportProgressDi
 
     @Override
     public void onExportFinished(final String directoryDisplayName, final int successCount, final int fileCount) {
-        runOnUiThread(() -> {
-            ExportFinishedDialogFragment.showDialog(getSupportFragmentManager(), directoryDisplayName, successCount, fileCount);
-        });
+        runOnUiThread(() -> ExportFinishedDialogFragment.showDialog(getSupportFragmentManager(), directoryDisplayName, successCount, fileCount));
     }
 
     @Override

src/main/java/de/dennisguse/opentracks/io/file/importer/AbstractFileTrackImporter.java

@@ -449,7 +449,7 @@ abstract class AbstractFileTrackImporter extends DefaultHandler implements Track
         float speedValue;
         if (speed != null) {
             try {
-                speedValue = Float.valueOf(speed);
+                speedValue = Float.parseFloat(speed);
                 trackPoint.setSpeed(speedValue);
             } catch (Exception e) {
                 throw new SAXException(createErrorMessage(String.format(Locale.US, "Unable to parse speed: %s", speed)), e);

src/main/java/de/dennisguse/opentracks/io/file/importer/ImportActivity.java

@@ -64,9 +64,7 @@ public class ImportActivity extends FragmentActivity implements ImportProgressDi
 
     @Override
     public void onImportFinished(final String directoryDisplayName, final int successCount, final int fileCount) {
-        runOnUiThread(() -> {
-            ImportFinishedDialogFragment.showDialog(getSupportFragmentManager(), directoryDisplayName, successCount, fileCount);
-        });
+        runOnUiThread(() -> ImportFinishedDialogFragment.showDialog(getSupportFragmentManager(), directoryDisplayName, successCount, fileCount));
     }
 
     @Override

src/main/java/de/dennisguse/opentracks/io/file/importer/KmzTrackImporter.java

@@ -53,7 +53,7 @@ public class KmzTrackImporter implements TrackImporter {
 
     private final Context context;
     private final long importTrackId;
-    private Uri uriKmzFile;
+    private final Uri uriKmzFile;
 
     /**
      * @param context       the context