运行方法onclick崩溃在android [英] run method onclick crash in android

问题描述

我目前正在编写一个简单的在Android上的消息应用程序。我有一个类中的服务器 runServer ，运行完美。然后我在我的 mainActivity 中的一个方法中有一个客户端。我有一个按钮，它有一个 onclick =startClient。但每当我运行点击按钮，我得到一个错误。

  03-11 13：01：40.622：E / AndroidRuntime（718）：java.lang.IllegalStateException：
找不到方法startClient（View）在活动类com.example.datorkomprojekt.MainActivity 
 on onClick处理程序在视图类android.widget.Button与id'connect'
  
 
 
 
我可以如何解决这个问题？
 
 
 
 MainActivity 
  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）{
} 
线程线程= 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）{} 
} 
} 
 
私人类TalkToClient实现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 ）; 
} 
 
} 
  
 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_horizo​​ntal_margin
 android：paddingRight =@ dimen / activity_horizo​​ntal_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 = 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> 
  
 
 
解决方案
  public void startClient v） ..这将是方法的签名
 
 
 
  UPDATE： 
 
 
 
因为每个人都发布相同的答案，我想我更好地提高我的答案有点。虽然单行解决了你的问题如果你有空闲的时间，你可以看到以下链接..在那里你可以找到清楚的概念，不同的方式来处理点击事件
 
 
 
 < a href =http://www.remwebdevelopment.com/dev/a69/Different-Ways-To-Handle-Clicks.html =nofollow> http://www.remwebdevelopment.com/dev/a69/ Different-Ways-To-Handle-Clicks.html  
 
 
 
  http://smartcloudblog.blogspot.com/2011/09/android-onclicklisteners-vs.html  
 
I am currently working on writing a simple message application on Android. I have the server in a class called runServer, which runs perfectly. Then i have a client in a method in my mainActivity. I have a button, which has an onclick="startClient". but whenever i run an click on the button, i get an error. 
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'
What can I do to solve this?

MainActivity
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();
    }

}
server class
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 layout
<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>

解决方案
public void startClient(View v) .. this will be the signature of the method

UPDATE:

as everybody is posting the same answer I think I better improve my answer a bit. Although the single line has solved your problem If you get free time you can see the following links .. There you can find clear concept about different ways to handle click events

http://www.remwebdevelopment.com/dev/a69/Different-Ways-To-Handle-Clicks.html

http://smartcloudblog.blogspot.com/2011/09/android-onclicklisteners-vs.html

                        
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