first version finished

.idea/gradle.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>

Readme.txt

@@ -0,0 +1,2 @@
+Name: Paul LĂdige
+Matrikel: 15405036

app/src/main/java/com/ploedige/fragments/Fragment1.java

@@ -1,6 +1,11 @@
+/**
+ * @author Paul Lödige (Matrikel: 15405036)
+ */
+
 package com.ploedige.fragments;
 
 import android.app.Activity;
+import android.content.DialogInterface;
 import android.os.Bundle;
 
 import androidx.annotation.NonNull;
@@ -9,13 +14,17 @@ import androidx.fragment.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.EditText;
+
+import java.sql.BatchUpdateException;
 
 public class Fragment1 extends Fragment {
 
     Fragment1Listener buttonCallback;
 
     public interface Fragment1Listener{
-        public void onFragment1ButtonClick();
+        public void onFragment1ButtonClick(String firstName, String lastName);
     }
 
     public Fragment1() {
@@ -30,7 +39,21 @@ public class Fragment1 extends Fragment {
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
         // Inflate the layout for this fragment
-        return inflater.inflate(R.layout.fragment_1, container, false);
+        View view = inflater.inflate(R.layout.fragment_1, container, false);
+
+        Button jump_btn = (Button) view.findViewById(R.id.jump_btn);
+        jump_btn.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                EditText firstName_etxt = (EditText) view.findViewById(R.id.firstName_etxt);
+                EditText lastName_etxt = (EditText) view.findViewById(R.id.lastName_etxt);
+                buttonCallback.onFragment1ButtonClick(
+                        firstName_etxt.getText().toString(),
+                        lastName_etxt.getText().toString());
+            }
+        });
+
+        return view;
     }
 
     @Override
@@ -43,8 +66,4 @@ public class Fragment1 extends Fragment {
             throw new ClassCastException(activity.toString() + "must implement Fragment1Listener");
         }
     }
-
-    public void jumpToFragment2(View view){
-        buttonCallback.onFragment1ButtonClick();
-    }
 }

app/src/main/java/com/ploedige/fragments/Fragment2.java

@@ -1,16 +1,39 @@
+/**
+ * @author Paul Lödige (Matrikel: 15405036)
+ */
+
 package com.ploedige.fragments;
 
+import android.app.Activity;
 import android.os.Bundle;
 
+import androidx.annotation.NonNull;
 import androidx.fragment.app.Fragment;
 
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.TextView;
+
+import org.w3c.dom.Text;
+
 public class Fragment2 extends Fragment {
-    public Fragment2() {
+
-        // Required empty public constructor
+    Fragment2Listener buttonCallback;
+
+    public interface Fragment2Listener{
+        public void onFragment2ButtonClick();
     }
+
+    private String firstName;
+    private String lastName;
+
+    public Fragment2(String firstName, String lastName) {
+       this.firstName = firstName;
+       this.lastName = lastName;
+    }
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -20,6 +43,34 @@ public class Fragment2 extends Fragment {
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
         // Inflate the layout for this fragment
-        return inflater.inflate(R.layout.fragment_2, container, false);
+        View view =  inflater.inflate(R.layout.fragment_2, container, false);
+
+        //write values to the text views
+        TextView firstName_tv = (TextView) view.findViewById(R.id.firstName_tv);
+        TextView lastName_tv = (TextView) view.findViewById(R.id.lastName_tv);
+        firstName_tv.setText(firstName);
+        lastName_tv.setText(lastName);
+
+        //bind the Frament2Listener to the button
+        Button jump_btn = (Button) view.findViewById(R.id.jump_btn);
+        jump_btn.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+               buttonCallback.onFragment2ButtonClick();
+            }
+        });
+
+        return view;
+    }
+
+    @Override
+    public void onAttach(@NonNull Activity activity) {
+        super.onAttach(activity);
+        try{
+            buttonCallback = (Fragment2Listener) activity;
+        }
+        catch (ClassCastException e){
+            throw new ClassCastException(activity.toString() + "must implement Fragment2Listener");
+        }
     }
 }

app/src/main/java/com/ploedige/fragments/MainActivity.java

@@ -1,3 +1,7 @@
+/**
+ * @author Paul Lödige (MatrikeL: 15405036)
+ */
+
 package com.ploedige.fragments;
 
 import androidx.appcompat.app.AppCompatActivity;
@@ -6,7 +10,9 @@ import androidx.fragment.app.FragmentTransaction;
 
 import android.os.Bundle;
 
-public class MainActivity extends FragmentActivity implements Fragment1.Fragment1Listener {
+public class MainActivity
+        extends FragmentActivity
+        implements Fragment1.Fragment1Listener, Fragment2.Fragment2Listener {
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -24,12 +30,22 @@ public class MainActivity extends FragmentActivity implements Fragment1.Fragment
     }
 
     @Override
-    public void onFragment1ButtonClick() {
+    public void onFragment1ButtonClick(String firstName, String lastName) {
-        Fragment2 fragment2 = new Fragment2();
+        Fragment2 fragment2 = new Fragment2(firstName,lastName);
         FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
 
         fragmentTransaction.replace(R.id.fracment_container,fragment2);
         fragmentTransaction.addToBackStack(null);
         fragmentTransaction.commit();
     }
+
+    @Override
+    public void onFragment2ButtonClick() {
+        Fragment1 fragment1 = new Fragment1();
+        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
+
+        fragmentTransaction.replace(R.id.fracment_container,fragment1);
+        fragmentTransaction.addToBackStack(null);
+        fragmentTransaction.commit();
+    }
 }

app/src/main/res/layout/fragment_1.xml

@@ -11,23 +11,65 @@
         android:layout_height="match_parent">
 
         <TextView
-            android:id="@+id/name_tv"
+            android:id="@+id/fragmentName_tv"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             app:layout_constraintTop_toTopOf="parent"
-            app:layout_constraintBottom_toBottomOf="parent"
+            android:layout_marginTop="5mm"
             app:layout_constraintLeft_toLeftOf="parent"
             app:layout_constraintRight_toRightOf="parent"
             android:textSize="5mm"
             android:text="Fragment1" />
 
-        <Button
+        <LinearLayout
+            android:id="@+id/firstName_ll"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            app:layout_constraintTop_toBottomOf="@id/name_tv"
+            android:orientation="horizontal"
+            app:layout_constraintLeft_toLeftOf="parent"
+            app:layout_constraintRight_toRightOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/fragmentName_tv">
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="First Name:"/>
+
+            <EditText
+                android:id="@+id/firstName_etxt"
+                android:minWidth="15mm"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"/>
+        </LinearLayout>
+
+        <LinearLayout
+            android:id="@+id/lastName_ll"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal"
+            app:layout_constraintLeft_toLeftOf="parent"
+            app:layout_constraintRight_toRightOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/firstName_ll">
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="First Name:"/>
+
+            <EditText
+                android:id="@+id/lastName_etxt"
+                android:minWidth="15mm"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"/>
+        </LinearLayout>
+
+        <Button
+            android:id="@+id/jump_btn"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            app:layout_constraintTop_toBottomOf="@id/lastName_ll"
             app:layout_constraintLeft_toLeftOf="parent"
             app:layout_constraintRight_toRightOf="parent"
-            android:onClick="jumpToFragment2"
             android:text="jump to Fragment 2"/>
 
     </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/fragment_2.xml

@@ -3,12 +3,74 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     tools:context=".Fragment2">
 
-    <!-- TODO: Update blank fragment layout -->
+    <androidx.constraintlayout.widget.ConstraintLayout
-    <TextView
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
+        android:layout_height="match_parent">
-        android:text="@string/hello_blank_fragment" />
 
+        <TextView
+            android:id="@+id/fragmentName_tv"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            app:layout_constraintTop_toTopOf="parent"
+            android:layout_marginTop="5mm"
+            app:layout_constraintLeft_toLeftOf="parent"
+            app:layout_constraintRight_toRightOf="parent"
+            android:textSize="5mm"
+            android:text="Fragment 2" />
+
+        <LinearLayout
+            android:id="@+id/firstName_ll"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal"
+            app:layout_constraintLeft_toLeftOf="parent"
+            app:layout_constraintRight_toRightOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/fragmentName_tv">
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="First Name:"/>
+
+            <TextView
+                android:id="@+id/firstName_tv"
+                android:minWidth="15mm"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"/>
+        </LinearLayout>
+
+        <LinearLayout
+            android:id="@+id/lastName_ll"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal"
+            app:layout_constraintLeft_toLeftOf="parent"
+            app:layout_constraintRight_toRightOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/firstName_ll">
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="First Name:"/>
+
+            <TextView
+                android:id="@+id/lastName_tv"
+                android:minWidth="15mm"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"/>
+        </LinearLayout>
+
+        <Button
+            android:id="@+id/jump_btn"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            app:layout_constraintTop_toBottomOf="@id/lastName_ll"
+            app:layout_constraintLeft_toLeftOf="parent"
+            app:layout_constraintRight_toRightOf="parent"
+            android:text="jump to Fragment 1"/>
+
+    </androidx.constraintlayout.widget.ConstraintLayout>
 </FrameLayout>