Android About.me/DavidCorrado Mobile Meetup Organizer

Transcription

1 Android About.me/DavidCorrado Mobile Meetup Organizer

2 IDE Don t Use Eclipse Use either Android Studio/IntelliJ They are basically the same thing. They are both built off of IntelliJ Still in beta but everyone uses it I recommend Android Studio. It takes out the stuff that is not android related and dumbs things down =)

3 Attach Debugger Button If you have built the application on the device/emulator you can press this button at any time and it will attach the debugger After a crash you can put a breakpoint and attach to the debugger and dig into what is happening.

4 Crashlytics Bug Reporting Tons of information on crashes QA Distributions outside of app store Analytics

5 Emulator Slow When creating an emulator Use Intel X86 version. Check Hardware acceleration Use Genymotion to run Android in a virtual machine Its kind of buggy. I had to run android Run on a device Before going to production you have to run on a device anyway But keep in mind different screen sizes I use Genymotion and devices

6 Clean Code on Save Every Time you save it will clean up your code to match google s standard Create Macro Menu->Edit->Macro->Start Recording Choose Menu->Code Reformat Code,Auto Indent, Optimize Import, Rearrange Code Stop Recording Menu->Edit->Macro->Stop Recording Override Save Button Menu->Android Studio->Preferences> Search Keymap->Find Macros and the macro you saved and set the key to be save all command I then recommend you reformat the entire app so after that all your checkins are clean

7 Distribute Default settings You can save your settings and distribute them to your team. Menu->Export Settings Be careful what you choose here. You will want to test this before distributing to the team. I think we ran into a problem with the SDK tables

8 Git Try to use Android studio for everything with Git. History,Merge,Commit,Push/Pull, Stash Example if you made a few changes to a file. You want to revert just a single function. You can compare with previous revision. Then the buttons to choose previous for that function

9 Auto Update Android SDK When building your application can automatically download Android SDK/Play Services/Build Tools/Platform Tools etc Example. The lead developer updates any of the above. When you pull down the code it will give you errors that you need to update any of the above With the Tool above it automagically works

10 Browse Android SDK Source You can do this easily by downloading the Android SDK Source from the SDK Manager. This will make it so you can browse the android source just as easily as your own. Example you can browse how the Button works

11 Communication Between Fragments/Activities It is not very easy to communicate between activities and fragments etc. EventBus sends an event that we can listen to anywhere. If you use otto or something else and prefer it over greenrobots Event bus contact me after so you can do a talk on it at the mobile meetup.

12 Automagically Handle Network You can theoretically never touch JSON. You send it a model. It returns a model Automatically does request on separate thread and returns data via callback REST,Multipart form Retrofit

13 Database I prefer to never touch the database except in the DAO. So I only work with models. You can manually do this or there are frameworks that do this Green DAO is popular Thing I do not like about it is there is a build process to generate DAO objects Interesting framework that you just do annotations and the basic methods DAO methods are created without a build process. I haven t used this but its interesting

14 Global Context? You have context being sent all around the application. It seems some places you can just use the application context. For Example if you needed context.getstring(r.string.hello); If you were doing the above inside of a method you would have to pass the context to the method. Or if you use the example on the next slide you can do MyApplication.getContext().getString(R.string.hello); Or create a helper that does essentially the above

15 Global Context Example //In Manifest <application android:name="com.xyz.myapplication"> </application> //then write the class public class MyApplication extends Application{ private static Context context; public void oncreate(){ super.oncreate(); MyApplication.context = getapplicationcontext(); } public static Context getappcontext() { return MyApplication.context; } }

16 Dependency Injection Dagger is popular I am not really the best person to speak on this. Its definately something to look into. You could use this instead of a global context like I demoed before

17 Automagically Handle Images Load Images in one line of code. Something like Picasso.with(context).load(urlString).into (imageview); It can handle resizing. Making images into circles etc Picasso

18 Multiple Image Resources mdpi,hdpi,xhdpi etc Create an image at your highest supported resolution and then use one of the below tools There are a lot of cool tools in here look through it Write or google for a script that automatically creates all of the images you need and puts them in the appropriate folder

19 Cleaner Code with Butterknife Someone should do a whole talk on this. Essentially its helps you reference your views easier Butterknife There are a lot of different cases where you can use this

20 Cleaner Code With Butterknife Example //Old way Button button= (Button) findviewbyid(r.id.submit); button.setonclicklistener(new View.OnClickListener() public void onclick(view v) { //Do Onclick logic } }); //With public void submit() { //Do Onclick logic }

21 Code Completion You can auto create models getter and setters Right click in code ->Generate->Getters and Setters You can do this for a lot of different methods You can also type in the class and have it automatically complete override methods Android Intentions on next slide

22 Android Intentions This is the automagic creation of code that they think you want to. On mac you can do this with hotkey alt+enter You can also put your cursor on the area that you want the intention to run on. Then you should see a lightbulb to have it tell you the intentions Android team recommends you look through these so you use them. Menu->Android Studio->Preferences->Search Intentions This does things like create string resource, implement unimplemented methods, etc

23 Handling Configuration Changes If an android device is rotated everything is destroyed and recreated again. There are alot of ways to handle this Put all data into model every time the activity is destroyed and save it in the parcelable data. Each built in view if it has an id. It will restore some state. If you have a custom view you will have to write your own restore state. Also you can not have multiple of the same view id used on the activity. So if you are dynamically adding the same view you will have to generate a dynamic id. Google how to do this. You can also make it so your application never does configuration changes by adding configuration flags to all activities but that is pretty hacky Some use this framework as well but it does not solve all your problems Let me know after the talk if you know a good way to do this because. I think its annoying =)

24 Android Standard New Instance When creating things that need an instance created. Android generally creates a static method in the class that creates the new instance. Android does this when it you use the Activity generator This is so you do not have new instance code everywhere

25 Example New Instance public static UserFragment newinstance(publicuser user) { UserFragment fragment = new UserFragment(); Bundle args = new Bundle(); args.putparcelable(public_user_tag, user); fragment.setarguments(args); return fragment; }

26 Too Many abstract methods You can create a class that implements all the abstract methods so your code does not have empty methods A great example of this is the Text Watcher Next slide shows the method that you would implement instead of TextWatcher

27 Too Many abstract methods Example abstract public class BaseTextWatcher implements TextWatcher public void beforetextchanged(charsequence s, int start, int count, int after) { public void ontextchanged(charsequence s, int start, int before, int count) { public void aftertextchanged(editable s) { } }

28 Quick Tips You can click in logcat to keep your location If you dont do this it will scroll you to the bottom You can setup a proxy from your device to your computer with a tool such as fiddler or Charles You can right click on a png to create a 9 patch

29 Library Recommendations