Merge pull request #74 from lewismcgeary/pause-and-resume

add automatic pause and resume behaviour when leaving a running game fixes #49
lewismcgeary · Feb 8, 2016 · 6d6207c · 6d6207c
2 parents 58ab560 + 500ef90
commit 6d6207c
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diff --git a/app/src/main/java/io/github/lewismcgeary/androidgameoflife/GridPresenter.java b/app/src/main/java/io/github/lewismcgeary/androidgameoflife/GridPresenter.java
@@ -13,6 +13,7 @@ public class GridPresenter {
     LifeGridLayout worldGridLayout;
     int moveDuration;
     private CalculateUpdateTask calculateUpdateTask;
+    private boolean gamePaused = false;
 
     public GridPresenter(LifeGridLayout newWorldGridLayout, int moveDuration) {
         worldGridLayout = newWorldGridLayout;
@@ -49,6 +50,23 @@ public void startConstantUpdate() {
         calculateUpdateTask.execute();
     }
 
+    public void pauseGame(){
+        //check if there is an existing running async task
+        if(calculateUpdateTask !=null) {
+            if (!calculateUpdateTask.isCancelled()) {
+                calculateUpdateTask.cancel(true);
+                gamePaused = true;
+            }
+        }
+    }
+
+    public void resumeGame(){
+        if(gamePaused){
+            startConstantUpdate();
+            gamePaused = false;
+        }
+    }
+
     public void resetGrid(){
         if(calculateUpdateTask != null) {
             calculateUpdateTask.cancel(true);

diff --git a/app/src/main/java/io/github/lewismcgeary/androidgameoflife/LifeGridFragment.java b/app/src/main/java/io/github/lewismcgeary/androidgameoflife/LifeGridFragment.java
@@ -59,6 +59,20 @@ public void onGlobalLayout() {
         return view;
     }
 
+    @Override
+    public void onPause() {
+        super.onPause();
+        worldGridPresenter.pauseGame();
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        if(worldGridPresenter != null) {
+            worldGridPresenter.resumeGame();
+        }
+    }
+
     private void setUpGrid() {
         int densityOfScreen = DisplayMetrics.DENSITY_DEFAULT;
         int cellSize = (int) getResources().getDimension(R.dimen.cell_size);