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# AndroidAsync
### AndroidAsync is a java.nio based socket and http library for Android.
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() {
@Override
// Callback is invoked with any exceptions/errors, and the result, if available.
public void onCompleted(Exception e, String result) {
if (e != null) {
e.printStackTrace();
return;
}
System.out.println("I got a string: " + 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 the cache, and the maximum size of the cache
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 let's you create simple HTTP servers:
```java
// listen on port 5000
AsyncHttpServer mServer = new AsyncHttpServer(5000);
mServer.get("/", new HttpServerRequestCallback() {
@Override
public void onRequest(AsyncHttpServerRequest request, AsyncHttpServerResponse response) {
response.send("Hello!!!");
}
});
// browsing http://localhost:5000 will return Hello!!!
```
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