ANDROID: Implement pause/resume

Don't just kill the whole process when the Activity is stopped. Instead,
use its events to pause or resume audio and the running engine (if any).
Of course not every engines implements that... but at least an incoming
call doesn't kill the game now (lol).

backends/platform/android/jni.cpp

@@ -27,6 +27,7 @@
 
 #include "base/main.h"
 #include "common/config-manager.h"
+#include "engines/engine.h"
 
 #include "backends/platform/android/android.h"
 #include "backends/platform/android/asset-archive.h"
@@ -93,6 +94,8 @@ const JNINativeMethod JNI::_natives[] = {
 		(void *)JNI::pushEvent },
 	{ "enableZoning", "(Z)V",
 		(void *)JNI::enableZoning },
+	{ "pauseEngine", "(Z)V",
+		(void *)JNI::pauseEngine }
 };
 
 JNI::JNI() {
@@ -613,5 +616,15 @@ void JNI::enableZoning(JNIEnv *env, jobject self, jboolean enable) {
 	_system->enableZoning(enable);
 }
 
+void JNI::pauseEngine(JNIEnv *env, jobject self, jboolean pause) {
+	if (!_system || !g_engine)
+		return;
+
+	if ((pause && !g_engine->isPaused()) || (!pause && g_engine->isPaused())) {
+		LOGD("pauseEngine: %d", pause);
+		g_engine->pauseEngine(pause);
+	}
+}
+
 #endif
 

backends/platform/android/jni.h

@@ -129,6 +129,8 @@ private:
 
 	static void pushEvent(JNIEnv *env, jobject self, jobject java_event);
 	static void enableZoning(JNIEnv *env, jobject self, jboolean enable);
+
+	static void pauseEngine(JNIEnv *env, jobject self, jboolean pause);
 };
 
 inline bool JNI::haveSurface() {

backends/platform/android/org/inodes/gus/scummvm/ScummVM.java

@@ -44,6 +44,7 @@ public abstract class ScummVM implements SurfaceHolder.Callback, Runnable {
 	final private native void destroy();
 	final private native void setSurface(int width, int height);
 	final private native int main(String[] args);
+	final private native void pauseEngine(boolean pause);
 
 	// Set scummvm config options
 	final public native void enableZoning(boolean enable);
@@ -134,12 +135,14 @@ public abstract class ScummVM implements SurfaceHolder.Callback, Runnable {
 		System.exit(res);
 	}
 
-	public void pause() {
-		// TODO
-	}
+	public void pause(boolean pause) {
+		if (audio_track != null && !pause)
+			audio_track.play();
 
-	public void resume() {
-		// TODO
+		pauseEngine(pause);
+
+		if (audio_track != null && pause)
+			audio_track.stop();
 	}
 
 	final private void initEGL() throws Exception {

backends/platform/android/org/inodes/gus/scummvm/ScummVMActivity.java

@@ -161,30 +161,46 @@ public class ScummVMActivity extends Activity {
 		scummvm_thread.start();
 	}
 
-	private boolean was_paused = false;
-
 	@Override
-	public void onPause() {
-		if (scummvm != null) {
-			was_paused = true;
-			scummvm.pause();
-		}
+	public void onStart() {
+		Log.d(ScummVM.LOG_TAG, "onStart");
 
-		super.onPause();
+		super.onStart();
 	}
 
 	@Override
 	public void onResume() {
+		Log.d(ScummVM.LOG_TAG, "onResume");
+
 		super.onResume();
 
-		if (scummvm != null && was_paused)
-			scummvm.resume();
+		if (scummvm != null)
+			scummvm.pause(false);
+	}
 
-		was_paused = false;
+	@Override
+	public void onPause() {
+		Log.d(ScummVM.LOG_TAG, "onPause");
+
+		super.onPause();
+
+		if (scummvm != null)
+			scummvm.pause(true);
 	}
 
 	@Override
 	public void onStop() {
+		Log.d(ScummVM.LOG_TAG, "onStop");
+
+		super.onStop();
+	}
+
+	@Override
+	public void onDestroy() {
+		Log.d(ScummVM.LOG_TAG, "onDestroy");
+
+		super.onDestroy();
+
 		if (scummvm != null) {
 			scummvm.pushEvent(new Event(Event.EVENT_QUIT));
 
@@ -194,9 +210,9 @@ public class ScummVMActivity extends Activity {
 			} catch (InterruptedException e) {
 				Log.i(ScummVM.LOG_TAG, "Error while joining ScummVM thread", e);
 			}
-		}
 
-		super.onStop();
+			scummvm = null;
+		}
 	}
 
 	static final int MSG_MENU_LONG_PRESS = 1;