Android: made sure that when the screensaver is disabled, Android-M devices don't lower the app priority

examples/Demo/Builds/Android/src/com/juce/jucedemo/JuceDemo.java

@@ -143,6 +143,7 @@ public class JuceDemo   extends Activity
     //==============================================================================
     private ViewHolder viewHolder;
     private boolean isScreenSaverEnabled;
+    private java.util.Timer keepAliveTimer;
 
     public final ComponentPeerView createNewView (boolean opaque, long host)
     {
@@ -230,14 +231,39 @@ public class JuceDemo   extends Activity
         if (isScreenSaverEnabled != enabled)
         {
             isScreenSaverEnabled = enabled;
+
+            if (keepAliveTimer != null)
+            {
+                keepAliveTimer->cancel();
+                keepAliveTimer = null;
+            }
+
             if (enabled)
+            {
                 getWindow().clearFlags (WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
+            }
             else
+            {
                 getWindow().addFlags (WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
+
+                // If no user input is received after about 3 seconds, the OS will lower the
+                // task's priority, so this timer forces it to be kept active.
+                keepAliveTimer = new java.util.Timer();
+
+                keepAliveTimer.scheduleAtFixedRate (new TimerTask()
+                {
+                    @Override
+                    public void run()
+                    {
+                        android.app.Instrumentation instrumentation = new android.app.Instrumentation();
+                        instrumentation.sendKeyDownUpSync (KeyEvent.KEYCODE_BREAK);
+                    }
+                }, 2000, 2000);
+            }
         }
     }
 
-    public final boolean getScreenSaver ()
+    public final boolean getScreenSaver()
     {
         return isScreenSaverEnabled;
     }

modules/juce_core/native/java/JuceAppActivity.java

@@ -43,6 +43,13 @@ import android.text.ClipboardManager;
 import android.text.InputType;
 import android.util.DisplayMetrics;
 import android.util.Log;
+import java.lang.Runnable;
+import java.util.List;
+import java.util.Arrays;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Hashtable;
+import java.util.TimerTask;
 import java.io.*;
 import java.net.URL;
 import java.net.HttpURLConnection;
@@ -143,6 +150,7 @@ public class JuceAppActivity   extends Activity
     //==============================================================================
     private ViewHolder viewHolder;
     private boolean isScreenSaverEnabled;
+    private java.util.Timer keepAliveTimer;
 
     public final ComponentPeerView createNewView (boolean opaque, long host)
     {
@@ -230,14 +238,46 @@ public class JuceAppActivity   extends Activity
         if (isScreenSaverEnabled != enabled)
         {
             isScreenSaverEnabled = enabled;
+
+            if (keepAliveTimer != null)
+            {
+                keepAliveTimer.cancel();
+                keepAliveTimer = null;
+            }
+
             if (enabled)
+            {
                 getWindow().clearFlags (WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
+            }
             else
+            {
                 getWindow().addFlags (WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
+
+                // If no user input is received after about 3 seconds, the OS will lower the
+                // task's priority, so this timer forces it to be kept active.
+                keepAliveTimer = new java.util.Timer();
+
+                keepAliveTimer.scheduleAtFixedRate (new TimerTask()
+                {
+                    @Override
+                    public void run()
+                    {
+                        android.app.Instrumentation instrumentation = new android.app.Instrumentation();
+
+                        try
+                        {
+                            instrumentation.sendKeyDownUpSync (KeyEvent.KEYCODE_BREAK);
+                        }
+                        catch (Exception e)
+                        {
+                        }
+                    }
+                }, 2000, 2000);
+            }
         }
     }
 
-    public final boolean getScreenSaver ()
+    public final boolean getScreenSaver()
     {
         return isScreenSaverEnabled;
     }