Проблемы с отображением вывода сообщения с использованием двух действий [ANDROID]

Question

Я пытаюсь объединить строки в Android, используя два действия. Каждый раз, когда я ввожу две строки и нажимаю кнопку, чтобы запускать сбой приложения на эмуляторе. Можете ли вы помочь мне найти то, что я делаю неправильно здесь? Мой код и ошибка приведены ниже.

Основная активность (активность 1)

package com.example.tristan.a1p1n1; 

import android.content.Intent; 
import android.net.Uri; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.EditText; 

public class MainActivity extends AppCompatActivity { 


    public final static String EXTRA_MESSAGE = "com.example.tristan.a1p1n1.MESSAGE"; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     // ATTENTION: This was auto-generated to implement the App Indexing API. 
     // See https://g.co/AppIndexing/AndroidStudio for more information. 
     client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build(); 
    } 

    public void sendMessage(View view) { 
     Intent intent = new Intent(this, DICS.class); 
     EditText editText = (EditText) findViewById(R.id.editText); 
     EditText editText2 = (EditText) findViewById(R.id.editText2); 
     String message = editText.getText().toString() + editText2.getText().toString(); 
     intent.putExtra(EXTRA_MESSAGE, message); 
     startActivity(intent); 

    }} 

DICS (Activity 2)

package com.example.tristan.a1p1n1; 

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.widget.TextView; 

/** 
* Created by Tristan on 2/11/2017. 
*/ 
public class DICS extends AppCompatActivity { 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.dics); 

     //TextView mTextView = (TextView)findViewById(R.id.textView2); 
     // mTextView.setText(getIntent().getStringExtra("message")) 
    } 
} 

Мой Сообщение об ошибке:

E/AndroidRuntime: FATAL EXCEPTION: main 
       Process: com.example.tristan.a1p1n1, PID: 3082 
       java.lang.IllegalStateException: Could not execute method for android:onClick 
        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293) 
        at android.view.View.performClick(View.java:5610) 
        at android.view.View$PerformClick.run(View.java:22265) 
        at android.os.Handler.handleCallback(Handler.java:751) 
        at android.os.Handler.dispatchMessage(Handler.java:95) 
        at android.os.Looper.loop(Looper.java:154) 
        at android.app.ActivityThread.main(ActivityThread.java:6077) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) 
       Caused by: java.lang.reflect.InvocationTargetException 
        at java.lang.reflect.Method.invoke(Native Method) 
        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) 
        at android.view.View.performClick(View.java:5610)  
        at android.view.View$PerformClick.run(View.java:22265)  
        at android.os.Handler.handleCallback(Handler.java:751)  
        at android.os.Handler.dispatchMessage(Handler.java:95)  
        at android.os.Looper.loop(Looper.java:154)  
        at android.app.ActivityThread.main(ActivityThread.java:6077)  
        at java.lang.reflect.Method.invoke(Native Method)  
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)  
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)  
       Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.tristan.a1p1n1/com.example.tristan.a1p1n1.DICS}; have you declared this activity in your AndroidManifest.xml? 
        at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1805) 
        at android.app.Instrumentation.execStartActivity(Instrumentation.java:1523) 
        at android.app.Activity.startActivityForResult(Activity.java:4224) 
        at android.support.v4.app.BaseFragmentActivityJB.startActivityForResult(BaseFragmentActivityJB.java:50) 
        at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:79) 
        at android.app.Activity.startActivityForResult(Activity.java:4183) 
        at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:859) 
        at android.app.Activity.startActivity(Activity.java:4507) 
        at android.app.Activity.startActivity(Activity.java:4475) 
        at com.example.tristan.a1p1n1.MainActivity.sendMessage(MainActivity.java:41) 
        at java.lang.reflect.Method.invoke(Native Method)  
        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)  
        at android.view.View.performClick(View.java:5610)  
        at android.view.View$PerformClick.run(View.java:22265)  
        at android.os.Handler.handleCallback(Handler.java:751)  
        at android.os.Handler.dispatchMessage(Handler.java:95)  
        at android.os.Looper.loop(Looper.java:154)  
        at android.app.ActivityThread.main(ActivityThread.java:6077)  
        at java.lang.reflect.Method.invoke(Native Method)  
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)  
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)  

activity_main.xml

<?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:id="@+id/activity_main" 
    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.tristan.a1p1n1.MainActivity"> 

    <EditText 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:inputType="textPersonName" 
     android:text="Enter a String" 
     android:ems="10" 
     android:layout_below="@+id/textView" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:id="@+id/editText" /> 

    <EditText 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:inputType="textPersonName" 
     android:text="Enter a String" 
     android:ems="10" 
     android:id="@+id/editText2" 
     android:layout_below="@+id/editText" 
     android:layout_alignRight="@+id/editText" 
     android:layout_alignEnd="@+id/editText" 
     android:layout_marginRight="11dp" 
     android:layout_marginEnd="11dp" 
     android:layout_marginTop="13dp" /> 

    <Button 
     android:text="+" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/editText2" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:layout_marginTop="23dp" 
     android:id="@+id/button" 
     android:onClick="sendMessage" /> 
</RelativeLayout> 

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.example.tristan.a1p1n1"> 

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity android:name=".MainActivity"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity><!-- ATTENTION: This was auto-generated to add Google Play services to your project for 
    App Indexing. See https://g.co/AppIndexing/AndroidStudio for more information. --> 
     <meta-data 
      android:name="com.google.android.gms.version" 
      android:value="@integer/google_play_services_version" /> 
    </application> 

</manifest> 

dics.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" android:layout_width="match_parent" 
    android:layout_height="match_parent"> 


    <TextView 
     android:text="TextView" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:id="@+id/textView2" /> 
</LinearLayout> 

Answer 1

ваша кнопка Xml должна быть:

<Button 
    android:text="+" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/editText2" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" 
    android:layout_marginTop="23dp" 
    android:id="@+id/button" 
    android:onClick="sendMessage" /> //change here 

Попробуйте это: в вашем MainActivity

String message = editText.getText().toString() + editText2.getText().toString(); 
intent.putExtra("message", message); 

В настоящее время в деятельности Dics:

TextView mTextView = (TextView)findViewById(R.id.textView2); 
    mTextView.setText(getIntent().getStringExtra("message")); //the key ID should match