Draw button and all, and add second screen

.idea/compiler.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="CompilerConfiguration">
-    <bytecodeTargetLevel target="1.8" />
+    <bytecodeTargetLevel target="11" />
   </component>
 </project>

.idea/gradle.xml

@@ -7,6 +7,7 @@
         <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
         <option name="gradleHome" value="/usr/local/Cellar/gradle/6.0.1/libexec" />
+        <option name="gradleJvm" value="11" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />

.idea/misc.xml

@@ -1,6 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="DesignSurface">
+    <option name="filePathToZoomLevelMap">
+      <map>
+        <entry key="app/src/main/res/layout/activity_display_message.xml" value="0.3527777777777778" />
+        <entry key="app/src/main/res/layout/activity_main.xml" value="0.375" />
+      </map>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">

app/src/main/AndroidManifest.xml

@@ -9,6 +9,9 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.MySecondApp">
+        <activity
+            android:name=".DisplayMessageActivity"
+            android:exported="false" />
         <activity
             android:name=".MainActivity"
             android:exported="true">

app/src/main/java/com/example/mysecondapp/DisplayMessageActivity.java

@@ -0,0 +1,14 @@
+package com.example.mysecondapp;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.os.Bundle;
+
+public class DisplayMessageActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_display_message);
+    }
+}

app/src/main/java/com/example/mysecondapp/MainActivity.java

@@ -2,7 +2,12 @@ package com.example.mysecondapp;
 
 import androidx.appcompat.app.AppCompatActivity;
 
+import android.content.Intent;
 import android.os.Bundle;
+import android.view.View;
+import android.widget.EditText;
+
+import static android.provider.AlarmClock.EXTRA_MESSAGE;
 
 public class MainActivity extends AppCompatActivity {
 
@@ -11,4 +16,13 @@ public class MainActivity extends AppCompatActivity {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
     }
+
+    /** Called when the user taps the Send button */
+    public void sendMessage(View view) {
+        Intent intent = new Intent(this, DisplayMessageActivity.class);
+        EditText editText = (EditText) findViewById(R.id.editTextTextPersonName);
+        String message = editText.getText().toString();
+        intent.putExtra(EXTRA_MESSAGE, message);
+        startActivity(intent);
+    }
 }

app/src/main/res/layout/activity_display_message.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".DisplayMessageActivity">
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/activity_main.xml

@@ -6,13 +6,30 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
+    <Button
+        android:id="@+id/button"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        android:layout_marginStart="16dp"
+        android:layout_marginEnd="16dp"
+        android:onClick="sendMessage"
+        android:text="@string/button_send"
+        app:layout_constraintBaseline_toBaselineOf="@+id/editTextTextPersonName"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toEndOf="@+id/editTextTextPersonName" />
 
+    <EditText
+        android:id="@+id/editTextTextPersonName"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:layout_marginTop="16dp"
+        android:ems="10"
+        android:inputType="textPersonName"
+        android:text="@string/edit_message"
+        app:layout_constraintEnd_toStartOf="@+id/button"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values/strings.xml

@@ -1,3 +1,5 @@
 <resources>
     <string name="app_name">My Second App</string>
+    <string name="edit_message">Enter a message</string>
+    <string name="button_send">Send</string>
 </resources>