Immer IllegalStateException auf den button klicken

Klick auf eine Schaltfläche, um die Migration auf eine andere Tätigkeit, die app abstürzt und das Protokoll zeigt:

java.lang.IllegalStateException: Could not execute method for android:onClick

Debuggen, ich habe versucht, zu migrieren, um eine leere Aktivität, noch zeigt es den gleichen Fehler. Kann nicht verstehen, warum!

Dies ist meine Haupttätigkeit java-Datei und zeigt es Fehler in host()'s Absicht-Funktion:

package com.example.unholyalliance.infinitestream;

import android.content.Context;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void host(View v)
    {
        Intent i = new Intent(this,Host.class);
        try
        {
            startActivity(i);
        }catch(IllegalStateException e)
        {
            Context context = getApplicationContext();
            CharSequence text = e.getMessage();
            int duration = Toast.LENGTH_SHORT;

            Toast toast = Toast.makeText(context, text, duration);
            toast.show();
        }
    }

    public void search(View v)
    {

    }
}



This is my Host.java file:

import android.content.Context;

import android.net.nsd.NsdManager;
import android.net.nsd.NsdServiceInfo;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

import java.io.IOException;
import java.net.ServerSocket;

public class Host extends AppCompatActivity {

    public String mServiceName="Stream";
    ServerSocket mServerSocket=null;
    NsdManager.RegistrationListener mRegistrationListener=null;
    private NsdManager mNsdManager=null;
    int port=9000;
    TextView service_status = (TextView) findViewById(R.id.textView1);
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_host);
        mNsdManager = (NsdManager) getSystemService(Context.NSD_SERVICE);
        try {
            initializeServerSocket();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void initializeServerSocket() throws IOException {
        //Initialize a server socket on the next available port.
        mServerSocket = new ServerSocket(0);

        //Store the chosen port.
        port =  mServerSocket.getLocalPort();
        registerService(port);

    }

    public void registerService(int port) {
        //Create the NsdServiceInfo object, and populate it.
        NsdServiceInfo serviceInfo  = new NsdServiceInfo();

        //The name is subject to change based on conflicts
        //with other services advertised on the same network.
        serviceInfo.setServiceName("Stream");
        serviceInfo.setServiceType("_http._tcp.");
        serviceInfo.setPort(port);
        mNsdManager.registerService(
                serviceInfo, NsdManager.PROTOCOL_DNS_SD, mRegistrationListener);
        initializeRegistrationListener();


    }



    public void initializeRegistrationListener() {
        mRegistrationListener = new NsdManager.RegistrationListener() {

            @Override
            public void onServiceRegistered(NsdServiceInfo NsdServiceInfo) {
                //Save the service name.  Android may have changed it in order to
                //resolve a conflict, so update the name you initially requested
                //with the name Android actually used.
                mServiceName = NsdServiceInfo.getServiceName();
              service_status.setText("Success");
            }

            @Override
            public void onRegistrationFailed(NsdServiceInfo serviceInfo, int errorCode) {
                //Registration failed!  Put debugging code here to determine why.
                service_status.setText("Registration Failed!");
            }

            @Override
            public void onServiceUnregistered(NsdServiceInfo arg0) {
                //Service has been unregistered.  This only happens when you call
                //NsdManager.unregisterService() and pass in this listener.
                service_status.setText("Registration not done");
            }

            @Override
            public void onUnregistrationFailed(NsdServiceInfo serviceInfo, int errorCode) {
                //Unregistration failed.  Put debugging code here to determine why.
                service_status.setText("Unregistration failed");
            }
        };
    }
}

Volle Stack-Trace:

E/AndroidRuntime: FATAL EXCEPTION: main
 java.lang.IllegalStateException: Could not execute method for android:onClick
     at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
     at android.view.View.performClick(View.java:4278)
     at android.view.View$PerformClick.run(View.java:17429)
     at android.os.Handler.handleCallback(Handler.java:725)
     at android.os.Handler.dispatchMessage(Handler.java:92)
     at android.os.Looper.loop(Looper.java:137)
     at android.app.ActivityThread.main(ActivityThread.java:5099)
     at java.lang.reflect.Method.invokeNative(Native Method)
     at java.lang.reflect.Method.invoke(Method.java:511)
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:803)
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:570)
     at dalvik.system.NativeStart.main(Native Method)
  Caused by: java.lang.reflect.InvocationTargetException
     at java.lang.reflect.Method.invokeNative(Native Method)
     at java.lang.reflect.Method.invoke(Method.java:511)
     at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
     at android.view.View.performClick(View.java:4278) 
     at android.view.View$PerformClick.run(View.java:17429) 
     at android.os.Handler.handleCallback(Handler.java:725) 
     at android.os.Handler.dispatchMessage(Handler.java:92) 
     at android.os.Looper.loop(Looper.java:137) 
     at android.app.ActivityThread.main(ActivityThread.java:5099) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:511) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:803) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:570) 
     at dalvik.system.NativeStart.main(Native Method) 
  Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.unholyalliance.infinitestream/com.example.unholyalliance.infinitestream.Host}; have you declared this activity in your AndroidManifest.xml?
     at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1633)
     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1425)
     at android.app.Activity.startActivityForResult(Activity.java:3370)
     at android.app.Activity.startActivityForResult(Activity.java:3331)
     at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:843)
     at android.app.Activity.startActivity(Activity.java:3566)
     at android.app.Activity.startActivity(Activity.java:3534)
     at com.example.unholyalliance.infinitestream.MainActivity.host(MainActivity.java:23)
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:511) 
     at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) 
     at android.view.View.performClick(View.java:4278) 
     at android.view.View$PerformClick.run(View.java:17429) 
     at android.os.Handler.handleCallback(Handler.java:725) 
     at android.os.Handler.dispatchMessage(Handler.java:92) 
     at android.os.Looper.loop(Looper.java:137) 
     at android.app.ActivityThread.main(ActivityThread.java:5099) 
     at java.lang.reflect.Method.invokeNative(Native Method) 
     at java.lang.reflect.Method.invoke(Method.java:511) 
     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:803) 
     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:570) 
     at dalvik.system.NativeStart.main(Native Method) 

activity_main.xml Datei:

<?xml version="1.0" encoding="utf-8"?>
<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: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="com.example.unholyalliance.infinitestream.MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Host"
        android:id="@+id/host_button"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="104dp"
        android:clickable="true"
        android:onClick="host" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Search"
        android:id="@+id/search_button"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:onClick="search"
        android:clickable="true" />
</RelativeLayout>
post activity_main.xml
post stacktrace.
In der Tat, was Georg schrieb, ist wahr, aber es sollte nicht trow IllegalStateException auf die MainActivity. Also ich glaube nicht, das ist dann sein problem...

InformationsquelleAutor yash1996 | 2016-04-08

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