Android learning ---- Using okHttp (get method) --- download images,

Android learning ---- Using okHttp (get method) --- download images,
First download the Jar package

Https://github.com/square/okhttp

 

If you use android studio, you only need to add dependencies.

compile 'com.squareup.okhttp3:okhttp:3.2.0'

 

2. Download and display an image

The hanlder method is used.

Package com. liunan. okhttpdemo2; import android. graphics. bitmap; import android. graphics. bitmapFactory; import android. OS. handler; import android. OS. message; import android. support. v7.app. appCompatActivity; import android. OS. bundle; import android. view. view; import android. widget. imageView; import android. widget. toast; import java. io. IOException; import java. io. inputStream; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.Response; import okhttp3.ResponseBody; public class MainActivity extends AppCompatActivity {private static final int ERROR = 1; private static final int SUCCESS = 2; private String url = "http: // 192.168.1.102: 8080/img/a.jpg"; private ImageView mIv; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); initView ();} private Handler handler = new Handler () {@ Override public void handleMessage (Message msg) {switch (msg. what) {case SUCCESS: mIv. setImageBitmap (Bitmap) msg. obj); break; case ERROR: Toast. makeText (MainActivity. this, "request timeout", Toast. LENGTH_SHORT ). show (); break ;}};/***** initialization component */private void initView () {mIv = (ImageView) findViewById (R. id. main_iv);}/*** click to get the image */public void getPic (View v) {new Thread () {@ Override public void run () {// get the okHttp object get Request, try {OkHttpClient client = new OkHttpClient (); // get the request Object Request = new Request. builder (). url (url ). build (); // obtain the response body ResponseBody body = client.newcall(request0000.exe cute (). body (); // get the stream InputStream in = body. byteStream (); // convert to bitmap Bitmap bitmap = BitmapFactory. decodeStream (in); // use Hanlder to send the Message msg = Message. obtain (); msg. what = SUCCESS; msg. obj = bitmap; handler. sendMessage (msg);} catch (IOException e) {e. printStackTrace (); // failed Message msg = Message. obtain (); msg. what = ERROR; handler. sendMessage (msg );}}}. start ();}}

You can also write network requests as a tool class,

Package com. liunan. okhttpdemo2; import java. io. IOException; import java. io. inputStream; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.Response;/*** Created by Liu Nan on 2016-03-27. */public class OkHttpUtils {OkHttpClient client = new OkHttpClient ();/*** get stream * @ param url request address * @ return input stream */public InputStream getInpuStream (String url) throws IOException {// Set Request request = new Request. builder (). url (url ). build (); // get the row response InputStream in = client.newcall(requestcmd.exe cute (). body (). byteStream (); return in;}/*** returns the String * @ param url * @ return returns the String * @ throws IOException */public String getString (String url) throws IOException {// Set Request request = new Request. builder (). url (url ). build (); // get the row Response response = client.newcall(requestcmd.exe cute (); return Response. body (). string ();}}

 

Get Method