Android tips. which simplify your life

Transcription

1 Android tips which simplify your life

2 Android Studio beta gradle build system maven-based build dependencies build variants code completion, refactoring, templates graphical template editor

3 Gradle apply plugin: 'com.android.application' android { compilesdkversion 20 buildtoolsversion "20.0.0"...

4 Gradle defaultconfig { applicationid "ee.ut.cs.mobile.demo" minsdkversion 14 targetsdkversion 20 versioncode 1 versionname "1.0"

5 Gradle... buildtypes { release { runproguard false proguardfiles 'proguard-rules.pro'

6 Gradle... buildtypes {... debug { applicationidsuffix '.debug'

7 Gradle dependencies { compile filetree(dir: 'libs', include: ['*.jar']) compile 'com.google.code.gson:gson:2.3'

8 Gradle android {... productflavors { cs { applicationid "ee.ut.cs" eco { applicationid "ee.ut.eco"

9 Gradle

10 Butter Knife view injection simplify fragments, adapters

11 Butter Knife TextView maintextview;... maintextview = (TextView) TextView maintextview; public View oncreateview(...) { View rootview = inflater.inflate(r.layout.fragment_main,...); ButterKnife.inject(this, rootview);

12 Butter Knife mainbutton.setonclicklistener(new View.OnClickListener() public void onclick(view v) { Toast.makeText(getActivity(), "Hi", Toast.LENGTH_SHORT).show(); public void submit() { Toast.makeText(getActivity(), "Hi", Toast.LENGTH_SHORT).show();

13 GSON java object to json json to java object User myuser = new User("Lars"); Gson gson = new Gson(); String userjson = gson.tojson(myuser);

14 Retrofit Retrofit turns your REST API into a Java interface.

15 Retrofit - Step 1: POJO curl -i { "login": "octocat", "id": , "avatar_url": " "type": "User", "name": "The Octocat", "company": "GitHub", "location": "San Francisco", " ": "octocat@github.com",...

16 Retrofit - Step 1: POJO public class GitHubUser { private String login; private String id; private String name; private String location; private String private String avatarurl; public GitHubUser(){

17 Retrofit - Step 2: Service Interface public interface GitHubService { public static String API_URL = List<Repository> listrepos(@path("user") String user);

18 Retrofit - Step 3: Rest Client RestAdapter restadapter = new RestAdapter.Builder().setEndpoint(GitHubService.API_URL).build(); GitHubService service = restadapter.create(githubservice.class); List<Repository> repos = service.listrepos("octocat");

19 Retrofit - Sync or Async?... List<Repository> repos = service.listrepos("octocat"); NetworkOnMainThreadException!

20 Retrofit - Sync or Async? public interface GitHubService { public static String API_URL = void listreposasync(@path("user") String user, Callback<List<Repository>> cb);

21 Retrofit - Sync or Async? GitHubService service = restadapter.create(githubservice.class); service.listreposasync("octocat", new Callback<List<Repository>>() public void success(list<repository> repositories, Response response) public void failure(retrofiterror error) { );

22 Retrofit RestAdapter.Builder builder = new RestAdapter.Builder(); builder.setendpoint(githubservice.api_url); if (BuildConfig.DEBUG) { builder.setloglevel(restadapter.loglevel.full); RestAdapter restadapter = builder.build();

23 Networking - DefaultHttpClient HttpClient client = new DefaultHttpClient(); HttpGet request = new HttpGet(" HttpResponse response = client.execute(request); BufferedReader rd = new BufferedReader (new InputStreamReader(response.getEntity().getContent())); String line = ""; while ((line = rd.readline())!= null) { textview.append(line);

24 Networking - OkHttp efficient http client by default spdy, connection pooling,...

25 Networking - OkHttp OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder().url(" Response response = client.newcall(request).execute(); textview.settext(response.body().string());

26 OkHttp + Retrofit OkHttpClient okhttpclient = new OkHttpClient(); RestAdapter.Builder builder = new RestAdapter.Builder(); builder.setendpoint(githubservice.api_url); builder.setclient(new OkClient(okHttpClient)); RestAdapter restadapter = builder.build();

27 Universal Image Loader load, cache and display images easily lots of configuration options good control over the image loading and caching process

28 Universal Image Loader <manifest> <!-- if you load images from Internet --> <uses-permission android:name="android.permission.internet" /> <!-- if you want to cache images on SD card --> <uses-permission android:name="android.permission.write_external_storage" />... </manifest>

29 Universal Image Loader ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this).build(); ImageLoader.getInstance().init(config); global for the application!

30 Universal Image public void getuserinfo() { getservice().getuserinfo("octocat", new Callback<GitHubUser>() public void success(githubuser githubuser, Response response) { ImageLoader.getInstance().displayImage(gitHubUser.getAvatarImageUrl(), avatarimageview); );

31 Exercise git clone