Persistent storage of dates in EvalActivity

ChronoPhage_GUI/app/src/main/java/de/hdm/dp/bd/chronophage/EvalActivity.java

@@ -2,6 +2,7 @@ package de.hdm.dp.bd.chronophage;
 
 import android.app.DatePickerDialog;
 
+import android.content.SharedPreferences;
 import android.os.Bundle;
 
 import android.text.InputType;
@@ -17,7 +18,6 @@ import com.github.mikephil.charting.utils.ColorTemplate;
 import de.hdm.dp.bd.chronophage.model.Task;
 import de.hdm.dp.bd.chronophage.model.TaskList;
 
-import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.Date;
@@ -30,6 +30,7 @@ public class EvalActivity extends CommonActivity {
 
     private DatePickerDialog datePickerDialogFrom;
     private DatePickerDialog datePickerDialogTo;
+    private PieChart pieChart;
     private EditText editTextFrom;
     private EditText editTextTo;
     private TaskList taskList;
@@ -38,7 +39,9 @@ public class EvalActivity extends CommonActivity {
     private Date dateTo;
     private boolean setFrom;
     private boolean setTo;
-    private PieChart pieChart;
+
+    private static final String KEY_DATEFROM = "dateFrom";
+    private static final String KEY_DATETO = "dateTo";
 
     /**
      * diese Methode muss nicht verändert werden, sie baut das Kuchendiagramm auf
@@ -49,26 +52,34 @@ public class EvalActivity extends CommonActivity {
         setContentView(R.layout.activity_eval);
         createNavigationBars();
 
-        //Content of the pie chart
         this.pieChart = (PieChart) findViewById(R.id.chart);
-
-        this.taskDatasets = new ArrayList<TaskDataset>();
+        this.editTextFrom = (EditText)findViewById(R.id.editTextDateFrom);
+        this.editTextTo = (EditText)findViewById(R.id.editTextDateTo);
+        this.editTextFrom.setInputType(InputType.TYPE_NULL);
+        this.editTextTo.setInputType(InputType.TYPE_NULL);
         this.taskList = MainActivity.exchangeTaskList;
+        this.taskDatasets = new ArrayList<TaskDataset>();
         this.dateFrom = new Date();
         this.dateTo = new Date();
         this.setFrom = false;
         this.setTo = false;
-        createTempDataset();
-        PieDataSet dataset = new PieDataSet(getEntries(taskDatasets), "Time spent");
 
-        //Set the data
-        PieData data = new PieData(getLabels(taskDatasets), dataset); // initialize PieData
-        this.pieChart.setData(data); //set data into chart
-
-        dataset.setColors(ColorTemplate.COLORFUL_COLORS); // set the color
-        dataset.setValueTextSize(16);
+        SharedPreferences settings = getPreferences(0);
+        long tmpDateFrom = settings.getLong(KEY_DATEFROM, -1);
+        long tmpDateTo = settings.getLong(KEY_DATETO, -1);
+        if (tmpDateFrom > 0) {
+            this.dateFrom.setTime(tmpDateFrom);
+            this.setFrom = true;
+            editTextFrom.setText(dateFrom.toString());
+        }
+        if (tmpDateTo > 0) {
+            this.dateTo.setTime(tmpDateTo);
+            this.setTo = true;
+            editTextTo.setText(dateTo.toString());
+        }
 
         this.initDatePickerDialog();
+        this.updateDataset();
     }
 
     /**
@@ -142,17 +153,14 @@ public class EvalActivity extends CommonActivity {
         } else {
             tmpTaskList = this.taskList.getAllTasks();
         }
-
         this.taskDatasets.clear();
-
-        for (int i = 0; i < tmpTaskList.size(); i++) {
-            Task task = tmpTaskList.get(i);
+        for (Task task: tmpTaskList) {
             if (task.getDuration() > 0) {
                 this.taskDatasets.add(new TaskDataset(task.getName(), task.getDuration()));
             }
         }
         PieDataSet dataset = new PieDataSet(getEntries(taskDatasets), "Time spent");
-        dataset.setColors(ColorTemplate.COLORFUL_COLORS); // set the color
+        dataset.setColors(ColorTemplate.COLORFUL_COLORS);
         dataset.setValueTextSize(16);
         PieData data = new PieData(getLabels(taskDatasets), dataset);
         this.pieChart.setData(data);
@@ -168,6 +176,10 @@ public class EvalActivity extends CommonActivity {
                 dateFrom = calendar.getTime();
                 setFrom = true;
                 editTextFrom.setText(dateFrom.toString());
+                SharedPreferences settings = getPreferences(0);
+                SharedPreferences.Editor editor = settings.edit();
+                editor.putLong(KEY_DATEFROM, dateFrom.getTime());
+                editor.apply();
                 updateDataset();
             }
         }, calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH));
@@ -179,15 +191,14 @@ public class EvalActivity extends CommonActivity {
                 dateTo = calendar.getTime();
                 setTo = true;
                 editTextTo.setText(dateTo.toString());
+                SharedPreferences settings = getPreferences(0);
+                SharedPreferences.Editor editor = settings.edit();
+                editor.putLong(KEY_DATETO, dateTo.getTime());
+                editor.apply();
                 updateDataset();
             }
         }, calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH));
 
-        this.editTextFrom = (EditText)findViewById(R.id.editTextDateFrom);
-        this.editTextTo = (EditText)findViewById(R.id.editTextDateTo);
-        this.editTextFrom.setInputType(InputType.TYPE_NULL);
-        this.editTextTo.setInputType(InputType.TYPE_NULL);
-
         this.editTextFrom.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {