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# AndroidAsync
### Asynchronous socket, http (client+server), websocket, and socket.io library.
It uses java.nio to manage connections. All the connections are thus managed on a *single* thread, rather than one per thread.
NIO is extremely efficient.
### Download a url to a String
```java
// url is the URL to download. The callback will be invoked on the UI thread
// once the download is complete.
AsyncHttpClient.getDefaultInstance().get(url, new AsyncHttpClient.StringCallback() {
// Callback is invoked with any exceptions/errors, and the result, if available.
@Override
public void onCompleted(Exception e, String result) {
if (e != null) {
e.printStackTrace();
return;
}
System.out.println("I got a string: " + result);
}
});
```
### Download JSON from a url
```java
// url is the URL to download. The callback will be invoked on the UI thread
// once the download is complete.
AsyncHttpClient.getDefaultInstance().get(url, new AsyncHttpClient.JSONObjectCallback() {
// Callback is invoked with any exceptions/errors, and the result, if available.
@Override
public void onCompleted(Exception e, JSONObject result) {
if (e != null) {
e.printStackTrace();
return;
}
System.out.println("I got a JSONObject: " + result);
}
});
```
### Download a url to a file
```java
AsyncHttpClient.getDefaultInstance().get(url, filename, new AsyncHttpClient.FileCallback() {
@Override
public void onCompleted(Exception e, File result) {
if (e != null) {
e.printStackTrace();
return;
}
System.out.println("my file is available at: " + result.getAbsolutePath());
}
});
```
### Caching is supported too (experimental)
```java
// arguments are the http client, the directory to store cache files, and the size of the cache in bytes
ResponseCacheMiddleware.addCache(AsyncHttpClient.getDefaultInstance(),
getFileStreamPath("asynccache"),
1024 * 1024 * 10);
```
### Can also create web sockets:
```java
AsyncHttpClient.getDefaultInstance().websocket(get, "my-protocol", new WebSocketConnectCallback() {
@Override
public void onCompleted(Exception ex, WebSocket webSocket) {
if (ex != null) {
ex.printStackTrace();
return;
}
webSocket.send("a string");
webSocket.send(new byte[10]);
webSocket.setStringCallback(new StringCallback() {
public void onStringAvailable(String s) {
System.out.println("I got a string: " + s);
}
});
webSocket.setDataCallback(new DataCallback() {
public void onDataAvailable(ByteBufferList byteBufferList) {
System.out.println("I got some bytes!");
// note that this data has been read
byteBufferList.clear();
}
});
}
});
```
### AndroidAsync also supports socket.io
```java
SocketIOClient.connect(AsyncHttpClient.getDefaultInstance(), "http://192.168.1.2:3000", new SocketIOConnectCallback() {
@Override
public void onConnectCompleted(Exception ex, SocketIOClient client) {
if (ex != null) {
ex.printStackTrace();
return;
}
client.setStringCallback(new StringCallback() {
@Override
public void onString(String string) {
System.out.println(string);
}
});
client.setEventCallback(new EventCallback() {
@Override
public void onEvent(String event, JSONArray arguments) {
System.out.println("event: " + event + " args: " + arguments.toString());
}
});
client.setJSONCallback(new JSONCallback() {
@Override
public void onJSON(JSONObject json) {
System.out.println("json: " + json.toString());
}
});
}
});
```
### Need to do multipart/form-data uploads? That works too.
```java
AsyncHttpPost post = new AsyncHttpPost("http://myservercom/postform.html");
MultipartFormDataBody body = new MultipartFormDataBody();
body.addFilePart("my-file", new File("/path/to/file.txt");
body.addStringPart("foo", "bar");
post.setBody(body);
AsyncHttpClient.getDefaultInstance().execute(post, new StringCallback() {
@Override
public void onCompleted(Exception e, AsyncHttpResponse source, String result) {
if (e != null) {
ex.printStackTrace();
return;
}
System.out.println("Server says: " + result);
}
});
```
### AndroidAsync also let's you create simple HTTP servers (and websocket servers):
```java
AsyncHttpServer server = new AsyncHttpServer();
server.get("/", new HttpServerRequestCallback() {
@Override
public void onRequest(AsyncHttpServerRequest request, AsyncHttpServerResponse response) {
response.send("Hello!!!");
}
});
// listen on port 5000
server.listen(5000);
// browsing http://localhost:5000 will return Hello!!!
```
|
