Retrofit

OkHttp Overview HTTP is the way modern applications network. It’s how we exchange data & media. OkHttp is an HTTP client that’s efficient by default: HTTP/2 support allows all requests to the same host to share a socket. OkHttp perseveres when the network is troublesome: it will silently recover from common connection problems. Using OkHttp is easy. OkHttp supports Android 2.3 and above. Examples Get a URL This program downloads a URL and print its contents as a string. OkHttpClient client = new OkHttpClient(); String run(String url) throws IOException { Request request = new Request.Builder() .url(url) .build(); Response response = client.newCall(request).execute(); return response.body().string();} Post to a Server This program posts data to a service. Download ↓ v3.4.1 JAR You'll also need Okio, which OkHttp uses for fast I/O and resizable buffers. The source code to OkHttp, its samples, and this website is available on GitHub. Maven Gradle compile 'com.squareup.okhttp3:okhttp:3.4.1' Contributing

Picasso Introduction Images add much-needed context and visual flair to Android applications. Picasso allows for hassle-free image loading in your application—often in one line of code! Picasso.with(context).load(" Many common pitfalls of image loading on Android are handled automatically by Picasso: Handling ImageView recycling and download cancelation in an adapter. Features Adapter Downloads Adapter re-use is automatically detected and the previous download canceled. @Override public void getView(int position, View convertView, ViewGroup parent) { SquaredImageView view = (SquaredImageView) convertView; if (view == null) { view = new SquaredImageView(context); } String url = getItem(position); Picasso.with(context).load(url).into(view);} Image Transformations Transform images to better fit into layouts and to reduce memory size. Picasso.with(context) .load(url) .resize(50, 50) .centerCrop() .into(imageView) Place Holders Resource Loading Debug Indicators

Gradle, please Robolectric Butter Knife Introduction Annotate fields with @Bind and a view ID for Butter Knife to find and automatically cast the corresponding view in your layout. class ExampleActivity extends Activity { @Bind(R.id.title) TextView title; @Bind(R.id.subtitle) TextView subtitle; @Bind(R.id.footer) TextView footer; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.simple_activity); ButterKnife.bind(this); // TODO Use fields... }} Instead of slow reflection, code is generated to perform the view look-ups. Calling bind delegates to this generated code that you can see and debug. The generated code for the above example is roughly equivalent to the following: public void bind(ExampleActivity activity) { activity.subtitle = (android.widget.TextView) activity.findViewById(2130968578); activity.footer = (android.widget.TextView) activity.findViewById(2130968579); activity.title = (android.widget.TextView) activity.findViewById(2130968577);} View Lists