minor update

Signed-off-by: Andrey Parfenov <a1994ndrey@gmail.com>

Author: Andrey1994

app/src/main/java/com/example/brainflowplot/DataActivity.java

@@ -40,8 +40,8 @@ protected void onCreate(Bundle savedInstanceState) {
     }
 
     @Override
-    protected void onStart() {
-        super.onStart();
+    protected void onResume() {
+        super.onResume();
         // read settings
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
         int boardId = Integer.valueOf(prefs.getString(getString(R.string.board_id_key), "-1"));
@@ -76,14 +76,14 @@ protected void onStart() {
     }
 
     @Override
-    protected void onStop() {
+    protected void onPause() {
         try {
             if (boardShim != null) {
                 boardShim.release_session();
             }
         } catch (BrainFlowError e) {
             Log.e(getString(R.string.log_tag), e.getMessage());
         }
-        super.onStop();
+        super.onPause();
     }
 }

app/src/main/java/com/example/brainflowplot/ui/psdplot/PSDPlotFragment.java

@@ -49,8 +49,8 @@ public View onCreateView(@NonNull LayoutInflater inflater,
         graph.getGridLabelRenderer().setGridStyle(GridLabelRenderer.GridStyle.BOTH);
         graph.getViewport().setMinX(1);
         graph.getViewport().setMaxX(100);
-        graph.getViewport().setMinY(0);
-        graph.getViewport().setMaxY(10);
+        graph.getViewport().setMinY(-7);
+        graph.getViewport().setMaxY(7);
         graph.getViewport().setYAxisBoundsManual(true);
         graph.getViewport().setXAxisBoundsManual(true);
         graph.getGridLabelRenderer().setNumHorizontalLabels(20);