Added callbacks JUCEApplication::suspended() and resumed() for iOS and Android.

extras/JuceDemo/Builds/Android/src/com/juce/JuceDemo.java

@@ -71,6 +71,20 @@ public final class JuceDemo   extends Activity
         super.onDestroy();
     }
 
+    @Override
+    protected final void onPause()
+    {
+        suspendApp();
+        super.onPause();
+    }
+
+    @Override
+    protected final void onResume()
+    {
+        super.onResume();
+        resumeApp();
+    }
+
     @Override
     public void onConfigurationChanged (Configuration cfg)
     {
@@ -87,6 +101,8 @@ public final class JuceDemo   extends Activity
     //==============================================================================
     private native void launchApp (String appFile, String appDataDir);
     private native void quitApp();
+    private native void suspendApp();
+    private native void resumeApp();
     private native void setScreenSize (int screenWidth, int screenHeight);
 
     //==============================================================================

modules/juce_core/native/java/JuceAppActivity.java

@@ -71,6 +71,20 @@ public final class JuceAppActivity   extends Activity
         super.onDestroy();
     }
 
+    @Override
+    protected final void onPause()
+    {
+        suspendApp();
+        super.onPause();
+    }
+
+    @Override
+    protected final void onResume()
+    {
+        super.onResume();
+        resumeApp();
+    }
+
     @Override
     public void onConfigurationChanged (Configuration cfg)
     {
@@ -87,6 +101,8 @@ public final class JuceAppActivity   extends Activity
     //==============================================================================
     private native void launchApp (String appFile, String appDataDir);
     private native void quitApp();
+    private native void suspendApp();
+    private native void resumeApp();
     private native void setScreenSize (int screenWidth, int screenHeight);
 
     //==============================================================================

modules/juce_events/messages/juce_ApplicationBase.h

@@ -127,6 +127,16 @@ public:
     */
     virtual void systemRequestedQuit() = 0;
 
+    /** This method is called when the application is being put into background mode
+        by the operating system.
+    */
+    virtual void suspended() = 0;
+
+    /** This method is called when the application is being woken from background mode
+        by the operating system.
+    */
+    virtual void resumed() = 0;
+
     /** If any unhandled exceptions make it through to the message dispatch loop, this
         callback will be triggered, in case you want to log them or do some other
         type of error-handling.

modules/juce_gui_basics/application/juce_Application.cpp

@@ -60,14 +60,11 @@ JUCEApplication::~JUCEApplication()
 }
 
 //==============================================================================
-bool JUCEApplication::moreThanOneInstanceAllowed()
-{
-    return true;
-}
+bool JUCEApplication::moreThanOneInstanceAllowed()  { return true; }
+void JUCEApplication::anotherInstanceStarted (const String&) {}
 
-void JUCEApplication::anotherInstanceStarted (const String&)
-{
-}
+void JUCEApplication::suspended() {}
+void JUCEApplication::resumed() {}
 
 void JUCEApplication::systemRequestedQuit()
 {

modules/juce_gui_basics/application/juce_Application.h

@@ -161,6 +161,16 @@ public:
     */
     virtual void systemRequestedQuit();
 
+    /** This method is called when the application is being put into background mode
+        by the operating system.
+    */
+    virtual void suspended();
+
+    /** This method is called when the application is being woken from background mode
+        by the operating system.
+    */
+    virtual void resumed();
+
     /** If any unhandled exceptions make it through to the message dispatch loop, this
         callback will be triggered, in case you want to log them or do some other
         type of error-handling.

modules/juce_gui_basics/native/juce_android_Windowing.cpp

@@ -49,6 +49,20 @@ JUCE_JNI_CALLBACK (JUCE_ANDROID_ACTIVITY_CLASSNAME, launchApp, void, (JNIEnv* en
     jassert (MessageManager::getInstance()->isThisTheMessageThread());
 }
 
+JUCE_JNI_CALLBACK (JUCE_ANDROID_ACTIVITY_CLASSNAME, suspendApp, void, (JNIEnv* env, jobject activity))
+{
+    JUCEApplicationBase* const app = JUCEApplicationBase::getInstance();
+    if (app != nullptr)
+        app->suspended();
+}
+
+JUCE_JNI_CALLBACK (JUCE_ANDROID_ACTIVITY_CLASSNAME, resumeApp, void, (JNIEnv* env, jobject activity))
+{
+    JUCEApplicationBase* const app = JUCEApplicationBase::getInstance();
+    if (app != nullptr)
+        app->resumed();
+}
+
 JUCE_JNI_CALLBACK (JUCE_ANDROID_ACTIVITY_CLASSNAME, quitApp, void, (JNIEnv* env, jobject activity))
 {
     JUCEApplicationBase::appWillTerminateByForce();

modules/juce_gui_basics/native/juce_ios_Windowing.mm

@@ -31,6 +31,8 @@
 
 - (void) applicationDidFinishLaunching: (UIApplication*) application;
 - (void) applicationWillTerminate: (UIApplication*) application;
+- (void) applicationDidEnterBackground: (UIApplication*) application;
+- (void) applicationWillEnterForeground: (UIApplication*) application;
 
 @end
 
@@ -50,6 +52,20 @@
     JUCEApplicationBase::appWillTerminateByForce();
 }
 
+- (void) applicationDidEnterBackground: (UIApplication*) application
+{
+    JUCEApplicationBase* const app = JUCEApplicationBase::getInstance();
+    if (app != nullptr)
+        app->suspended();
+}
+
+- (void) applicationWillEnterForeground: (UIApplication*) application
+{
+    JUCEApplicationBase* const app = JUCEApplicationBase::getInstance();
+    if (app != nullptr)
+        app->resumed();
+}
+
 @end
 
 namespace juce