LÖVE

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int w_isInterstitialLoaded(lua_State *L);
int w_showInterstitial(lua_State *L);

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int w_isInterstitialLoaded(lua_State *L)
{
	luax_pushboolean(L, instance()->isInterstitialLoaded());
	return 1;
}

int w_showInterstitial(lua_State *L)
{
	instance()->showInterstitial();
	return 0;
}

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static const luaL_Reg functions[] =
{
	{ "getOS", w_getOS },
	{ "getProcessorCount", w_getProcessorCount },
	{ "setClipboardText", w_setClipboardText },
	{ "getClipboardText", w_getClipboardText },
	{ "getPowerInfo", w_getPowerInfo },
	{ "openURL", w_openURL },
	{ "vibrate", w_vibrate },
	{ "isInterstitialLoaded", w_isInterstitialLoaded }, //Add this line
	{ "showInterstitial", w_showInterstitial}, // and this one
	{0,0}
}

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/**
	 * Checks if the interstitial ad is loaded.
	**/
	virtual bool isInterstitialLoaded() ;
	
	/**
	 * Shows the interstitial ad.
	**/
	virtual void showInterstitial() ;

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bool System::isInterstitialLoaded() {
#ifdef LOVE_ANDROID
	return love::android::isInterstitialLoaded();
#endif
}

void System::showInterstitial() {
#ifdef LOVE_ANDROID
	love::android::showInterstitial();
#endif
}

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bool isInterstitialLoaded();

void showInterstitial();

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bool isInterstitialLoaded()
{
	JNIEnv *env = (JNIEnv*) SDL_AndroidGetJNIEnv();

	jobject activity = (jobject) SDL_AndroidGetActivity();

	jclass clazz (env->GetObjectClass(activity));
	jmethodID method_id = env->GetMethodID (clazz, "isInterstitialLoaded", "()Z");

	jboolean interstitial_loaded = env->CallBooleanMethod (activity, method_id);

	env->DeleteLocalRef (activity);
	env->DeleteLocalRef (clazz);

	if (interstitial_loaded)
		return true;
	return false;
}

void showInterstitial()
{
	JNIEnv *env = (JNIEnv*) SDL_AndroidGetJNIEnv();

	jobject activity = (jobject) SDL_AndroidGetActivity();

	jclass clazz (env->GetObjectClass(activity));
	jmethodID showAd_method = env->GetMethodID (clazz, "showInterstitial", "()V");

	env->CallVoidMethod (activity, showAd_method);

	env->DeleteLocalRef (activity);
	env->DeleteLocalRef (clazz);
}

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boolean adLoaded = false;
[...]
public boolean isInterstitialLoaded() {
		Log.d("GameActivity", "Calling isInterstitialLoaded");
		
		runOnUiThread(new Runnable(){

			@Override
			public void run() { 
	
				if (mInterstitialAd.isLoaded()) {
					adLoaded = true;
					Log.d("GameActivity", "Ad is loaded");
				} else {
					adLoaded = false;
					Log.d("GameActivity", "Ad is not loaded.");
				}
			}
		});
		return adLoaded;
	}
	
	public void showInterstitial() {
		Log.d("GameActivity", "Showing ad!");
		Log.d("GameActivity", "Ad: " + mInterstitialAd);
		runOnUiThread(new Runnable(){

			@Override
			public void run(){ 
				if (mInterstitialAd.isLoaded()){
					mInterstitialAd.show();
					Log.d("GameActivity", "Ad loaded!, showing...");
				} else {
					Log.d("GameActivity", "Ad is NOT loaded!, skipping.");
				}

			};
		});
	}

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function love.load()
	--Admob Interstitial Ad example
	adLoaded = false;
	adTime = 0;
	font = love.graphics.newFont(15);
	sWidth = love.graphics.getWidth();
	sHeight = love.graphics.getHeight();
	text = "Click here to display ad";
end

function love.update(dt)
	adTime = adTime + dt;
	
	if adTime > 1 then
		--Check if ad is loaded
		adLoaded = love.system.isInterstitialLoaded();
		
		--Reset adTime
		adTime = 0;
	end
end

function love.draw()
	--Graphics
	love.graphics.setFont(font);
	love.graphics.setColor(255,0,0);
	love.graphics.rectangle("fill",sWidth/4,sHeight/4,sWidth/2,sHeight/2);
	love.graphics.setColor(255,255,255);
	love.graphics.print(text,(sWidth-text:getWidth())/2,(sHeight-text:getHeight())/2);
	love.graphics.print("Ad loaded: " .. tostring(adLoaded),30,30);
end

function love.mousereleased(x,y,b)
	local x1,x2,y1,y2 = sWidth/4,sWidth/4*3,sHeight/4,sHeight/4*3;
	--Check button
	if x >= x1 and x <= x2 and y >= y1 and y <= y2 and adLoaded then
       --Finally we can show!
		love.system.showInterstitial();
		print("Ad shown");
		--We displayed the ad, so adLoaded = false
		adLoaded = false;
	end
end