вівторок, 16 квітня 2013 р.

My new app - WallPaperGirls - Corset and spring-like ads management

Image for more interest :)

This is my new pet project that I started to develop month ago. First version include nearly 50 images and viewer application. I described here http://mvnblogbuild.blogspot.com/2013/04/android-bitmap-and-outofmemoryerror.html how I  fought with android memory manager. Here I tell you about ads management in this application. On my regular work I use spring framework. That's why I decided to create the same mechanism for ad rotation in app.
For each ad network was created separate class. Settings was stored in class annotations. For example annotation for class is looks like this:
import java.lang.annotation.*;
@Retention(value= RetentionPolicy.RUNTIME)
public @interface AdEntityMeta {
int runFrequency() default 0;
String name();
Sample ad class with AdEntityMeta:
@AdEntityMeta(name = "SampleAdNetworkName")
public class SampleAdNetwork {...}
 As you see we set the name of class to SampleAdNetworkName and leave runFrequency property to default 0 value. In manager class I use reflection for processing ad network classes. It iterate by classes and check annotation existence by calling:
Class adCl = adObj.getClass();
if(adCl.isAnnotationPresent(AdEntityMeta.class)) {...}
If annotation exists then we can get parameters from it:
 AdEntityMeta adEntityMeta = adCl.getAnnotation(AdEntityMeta.class);
Initialization method marked by AdEntityInitMeta annotation. To process it I use this code:
Method[] method = adCl.getMethods();
for(Method md: method) {
if(md.isAnnotationPresent(AdEntityInitMeta.class)) {
AdEntityInitMeta adEntityInitMeta = md.getAnnotation(AdEntityInitMeta.class);
if (adEntityInitMeta.initType() == AdEntityLifecycleType.APPLICATION_INIT) {
Class[] methodParamTypes = md.getParameterTypes();
Object[] methodArgs = new Object[methodParamTypes.length];
for (int i=0; i
if (methodParamTypes[i] == Activity.class) {
methodArgs[i] = this.baseActivity;
try {
md.invoke(adObj, methodArgs);
} catch (Exception e) {
Here program enumerates similarly all methods from class and checks method marked by AdEntityInitMeta annotation. All input method parameters are stored in methodArgs. In this code was allowed only parameter with type Activity or inherited from it.

If you are interested - here is my app: https://play.google.com/store/apps/details?id=com.blogspot.mvnblogbuild.wallpapergirls.corsets

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