Support library AppCompat v21.1.0

Recently Android Support Library has been updated to v21.1.1. There were some changes and you can see the changed via the link: https://developer.android.com/tools/support-library/index.html#revisions One thing I have notice is new AppCompt* classes for appcompat library. Now you need to use AppCompatActivity instead of ActionBarActivity. It supports support library action bar features. ActionBarActivity now has been deprecated. I think this kind of too often changes in framework makes us developers annoying. Some people might just start to use ActionBarActivity.

Comments

Apply Kotlin DataBinding to Android Studio Generated Main Activity

I posted how to setup Kotlin and DataBinding in Android Stuido in the last blog (http://marksunghunpark.blogspot.com.au/2017/04/kotlin-binding-library-setup-in-android.html). In this post, I am going to how to use DataBiding in the MainActivity when you create a navigation drawer project from Android Studio templates. Layouts You will have four layouts in app/src/res/layout folder: app/src/main/res/layout/activity_main.xml app/src/main/res/layout/app_bar_main.xml app/src/main/res/layout/content_main.xml app/src/main/res/layout/nav_header_main.xml And activity_main.xml contains all other layout using include layout. You need to have tag in activity_main.xml , app_bar_main.xml and content_main.xml . If you don't have the tag, Binding library cannot recognise the sub layouts properly. Binding library doesn't support toolbar and navigation drawer yet, so you can use using BindingAdapter if you want to use binding library.(But I'm gong to skip this part for simplici

How to test AsyncTask in Android

In Android, test is not as easy as any other platform. Because Android test cannot be run without emulator. Particulary when it comes to AsyncTask or Service, it is difficult to test because they are different type of thread and hard to check their result. Then, how can we ensure the result of AsyncTask valid? AsyncTask is a thread and an asynchnorous as the name means. So, we need to wait for it finishes its job and need to capture the event. Then, when it happens in AsyncTask. It can be one of onBackground() and onPostExecute() methods. It doesn't matter you use onBackground() or onPostExecute() but I prefer onPostExecute(). Anyway, we can test an AsyncTask if we can hook it. Then, how can we hook it? For that, we can use callback pattern. But we need to delay main thread to wait for the AsyncTask's job done because we want to check the result. So the structure for the test would be like: 1. Create AsyncTask A 2. Injection a callback into A 3. Wait until A finish 4.

Let's start Lambda in Android

In Android programming, I think Java & J2EE programming are not that different, we developers put many boiler plate code particularly when we use anonymous instances. Example1. Simple example button1.setOnClickListener(new OnClickListener(){ @Override public void onClick(View view){ //Do something } }); In the above example, what we really need is inside of onClick() method. Other code is actually decorations and we don't want it. How about we can pass just onClick method body as a parameter of setOnClickListener method like below? button1.setOnClickListener(view->{ //Do something }); That's what we have exactly wanted. We can use the code style in Java 8. I think you already might know about Java 8 Lambda but there is no official support for Java 8 in Android 8. It would be awesome we can use it in Android and there is a way to be able to use Lambda in Android as well. You can refer my previous blog to setup RetroLambda in Andro

Sunghun's Blog

Search This Blog