我正在尝试学习如何通过android中的websocket建立连接。我正在尝试使用websocket客户端向服务器发送消息,然后尝试在屏幕上查看它。
我可以启动应用程序,但是当我键入消息然后单击发送按钮时,我收到以下错误: org.java_websocket.exceptions.WebsocketNotConnectedException
这是我的MainActivity类:
public class MainActivity extends AppCompatActivity {
private TextView userView;
private ListView listView;
private EditText textToSend;
private Button sendButton;
private WebClient webClient;
private JSONObject jsonObject;
private URI uri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
userView = (TextView) findViewById(R.id.userView);
listView = (ListView) findViewById(R.id.listView);
textToSend = (EditText) findViewById(R.id.textToSend);
sendButton = (Button) findViewById(R.id.sendButton);
try {
uri = new URI("http://127.0.0.1:8080/chat");
} catch (URISyntaxException e) {
e.printStackTrace();
}
webClient = new WebClient(uri);
webClient.connect();
sendButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
jsonObject = new JSONObject();
try {
jsonObject.put("message",textToSend.toString());
} catch (JSONException e) {
e.printStackTrace();
}
webClient.send(jsonObject.toString());
}
});
}
}
这是WebClient类:
公共类WebClient扩展了WebSocketClient {
public WebClient(URI serverURI) {
super(serverURI);
}
@Override
public void onOpen(ServerHandshake handshakedata) {
Log.e("Websocket", "Opened");
}
@Override
public void onMessage(String message) {
}
@Override
public void onClose(int code, String reason, boolean remote) {
}
@Override
public void onError(Exception ex) {
}
}
单击发送按钮后,这是logcat:
---------崩溃的开始 10-30 20:09:50.830 2682-2682 / example.com.chatapp E / AndroidRuntime:FATAL EXCEPTION:main进程:example.com.chatapp,PID:2682 org.java_websocket.exceptions.WebsocketNotConnectedException 在org.java_websocket.WebSocketImpl.send(WebSocketImpl.java:566) 在org.java_websocket.WebSocketImpl.send(WebSocketImpl.java:543) 在org.java_websocket.client.WebSocketClient.send(WebSocketClient.java:171) 在ziad.example.com.chatapp.MainActivity $ 1.onClick(MainActivity.java:60) 在android.view.View.performClick(View.java:5637) 在android.view.View $ PerformClick.run(View.java:22429) 在android.os.Handler.handleCallback(Handler.java:751) 在android.os.Handler.dispatchMessage(Handler.java:95) 在android.os.Looper.loop(Looper.java:154) 在android.app.ActivityThread.main(ActivityThread.java:6119) at java.lang.reflect.Method.invoke(Native Method) 在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:886) 在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)