我目前正致力于在 Android 上编写一个简单的消息应用程序。我在一个名为 的类中有服务器runServer，它运行完美。然后我在我的mainActivity. 我有一个button，其中有一个onclick="startClient". 但每当我点击 时button，我都会收到错误消息。
03-11 13:01:40.622: E/AndroidRuntime(718): java.lang.IllegalStateException:
Could not find a method startClient(View) in the activity class com.example.datorkomprojekt.MainActivity
for onClick handler on view class android.widget.Button with id 'connect'
我能做些什么来解决这个问题？
主要活动
public class MainActivity extends Activity {
private Socket socket;
private ObjectInputStream ois;
private DataOutputStream dos;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
runOnUiThread(new Runnable(){
public void run(){
EditText et = (EditText) findViewById(R.id.message_id);
String message = et.getText().toString();
EditText et1 = (EditText) findViewById(R.id.messages);
et1.append(message);
}
});
}
public void startClient() {
socket = new Socket();
InetSocketAddress ipPort = new InetSocketAddress("10.0.2.15", 4444);
try {
socket.connect(ipPort);
dos = new DataOutputStream(socket.getOutputStream());
} catch (Exception e) {
}
Thread thread = new Thread();
thread.start();
}
}
服务器类
public class RunServer {
private ServerSocket server;
private Socket socket;
private DataInputStream dis;
private int port;
public RunServer(int port){
this.port = port;
Thread connectThread = new Thread( new Connect() );
connectThread.start();
}
private class Connect implements Runnable {
public void run() {
try {
server = new ServerSocket(port);
System.out.println("Server running");
while (true) {
socket = server.accept();
Thread clientThread = new Thread( new TalkToClient( socket ) );
clientThread.start();
System.out.println("someone connected");
}
} catch (IOException ex) {
Logger.getLogger(RunServer.class.getName()).log(Level.SEVERE, null, ex);
}
try {
server.close();
} catch( Exception e ) {}
}
}
private class TalkToClient implements Runnable{
private Socket socket;
public TalkToClient( Socket socket ) {
this.socket = socket;
}
public void run() {
String clientMsg;
try {
dis = new DataInputStream(socket.getInputStream());
while ((clientMsg = dis.readUTF()) != null) {
if (clientMsg.length() > 0) {
}
}
} catch (Exception e) {
System.out.println(e);
}
}
}
public static void main(String[] args) {
new RunServer(4444);
}
}
XML 布局
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/bakgrund"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="@string/ip"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@color/white" />
<EditText
android:id="@+id/ip_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/textView1"
android:background="@color/white"
android:ems="10"
android:hint="@string/get_ip"
android:inputType="numberDecimal" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/ip_id"
android:text="@string/port"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@color/white" />
<EditText
android:id="@+id/port_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/textView2"
android:background="@color/white"
android:ems="10"
android:hint="@string/get_port"
android:inputType="number" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/port_id"
android:layout_below="@+id/port_id"
android:text="@string/message"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@color/white" />
<EditText
android:id="@+id/message_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/textView3"
android:background="@color/white"
android:ems="10"
android:hint="@string/get_message" />
<Button
android:id="@+id/connect"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/message_id"
android:text="@string/connect"
android:textColor="@color/white"
android:onClick="startClient" />
<Button
android:id="@+id/send"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/connect"
android:layout_alignBottom="@+id/connect"
android:layout_toRightOf="@+id/connect"
android:text="@string/send"
android:textColor="@color/white" />
<TextView
android:id="@+id/status_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/connect"
android:layout_below="@+id/send"
android:layout_marginTop="23dp"
android:text="@string/status"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@color/white" />
<EditText
android:id="@+id/messages"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/status_id"
android:background="@color/white"
android:ems="10"
android:inputType="textMultiLine" />
</RelativeLayout>