Android Wi-Fi直连 传输数据
一旦两个设备之间建立了Wi-Fi直连,那么这两个设备之间就可以通过socket
传输数据大概得步骤如下:
- 通过
ServerSocket
创建一个server端,在后台一直坚挺是否有client端连接 - 通过
Socket
建立一个client端,根据server端的ip和port,连接到server端 - 建立连接之后,通过client向server端发送数据
- server端接到数据之后,可以对数据做对应的处理
Client
端的核心逻辑
-
在服务中创建一个
client
,并发送数据public class FileTransferService extends IntentService{ ... @Override protected void onHandleIntent(Intent intent) { Context context = getApplicationContext(); if(intent.getAction().equals(ACTION_SEND_FILE)){ String fileUri = intent.getExtras().getString(EXTRAS_FILE_PATH); String host = intent.getExtras().getString(EXTRAS_GROUP_ADDRESS); Socket socket = new Socket(); int port = intent.getExtras().getInt(EXTRAS_GROUP_PORT); try{ socket.bind(null); //根据server端的地址和端口建立socket,并设置超时 socket.connect(new InetSocketAddress(host, port),SOCKET_TIMEOUT); OutputStream os = socket.getOutputStream(); ContentResolver cr = context.getContentResolver(); InputStream is = null; is = cr.openInputStream(Uri.parse(fileUri)); //发送数据 DeviceDetailFragment.copyFile(is, os); }catch(Exception ex){ }finally{ if(socket != null){ if(socket.isConnected()){ try { socket.close(); } catch (IOException e) { e.printStackTrace(); } } } } } } }
-
需要从相册中选择图片,并启动service
Intent intent = new Intent(Intent.ACTION_GET_CONTENT); intent.setType("image/*"); startActivityForResult(intent, CHOOSE_FILE_RESULT_CODE);
在
onActivityResult
中获得选择的图像Uri uri = data.getData(); TextView statusText = (TextView)mContentView.findViewById(R.id.status_text); statusText.setText("Sending: "+uri); Intent i = new Intent(getActivity(), FileTransferService.class); i.setAction(FileTransferService.ACTION_SEND_FILE); i.putExtra(FileTransferService.EXTRAS_FILE_PATH, uri.toString()); i.putExtra(FileTransferService.EXTRAS_GROUP_ADDRESS, info.groupOwnerAddress.getHostAddress()); i.putExtra(FileTransferService.EXTRAS_GROUP_PORT, 8988); getActivity().startService(i);
Server
端核心代码
在设备连接之后,server就通过ServerSocket
一直监听client端的连接,一旦有client的请求,将client发来的数据
保存在本地,需要通过线程处理
public static class FileServerAsnycTask extends AsyncTask<Void,Void,String>{
private Context context;
private TextView statusText;
public FileServerAsnycTask(Context context,View statusText){
this.context = context;
this.statusText = (TextView)statusText;
}
@Override
protected String doInBackground(Void... params) {
try{
//创建socket监听
ServerSocket socket = new ServerSocket(8988);
Socket client = socket.accept();
//一旦有client端的连接,就接收client发来的数据并处理
final File f = new File(Environment.getExternalStorageDirectory()+"/"+
context.getPackageName()+"/wifishared-"+System.currentTimeMillis()+".jpg");
File dirs = new File(f.getParent());
if(!dirs.exists())
dirs.mkdirs();
f.createNewFile();
InputStream is = client.getInputStream();
copyFile(is, new FileOutputStream(f));
socket.close();
return f.getAbsolutePath();
}catch(Exception e){
return null;
}
}
//接受完成之后,可以通过相册打开查看
@Override
protected void onPostExecute(String result) {
if(result != null){
statusText.setText("File copied - "+result);
Intent i = new Intent();
i.setAction(Intent.ACTION_VIEW);
i.setDataAndType(Uri.parse("file//"+result), "image/*");
context.startActivity(i);
}
}
}
完整的代码请查看
测试可以在两个手机同时安装这个程序,一个手机是client端,一个手机是server端,连接之后,就可以相互传数据
完整的代码