This is the lab task of 1707086. Here first a activity called ShowAct…

app/src/androidTest/java/com/example/simpleparadox/listycity/ShowActivityTest.java

@@ -0,0 +1,75 @@
+package com.example.simpleparadox.listycity;
+
+import static junit.framework.TestCase.assertTrue;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+
+import android.app.Activity;
+import android.widget.EditText;
+import android.widget.ListView;
+
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.rule.ActivityTestRule;
+
+import com.robotium.solo.Solo;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/**
+ * Test class for MainActivity. All the UI tests are written here. Robotium test framework is used
+ */
+@RunWith(AndroidJUnit4.class)
+public class ShowActivityTest {
+
+    private Solo solo;
+
+    @Rule
+    public ActivityTestRule<ShowActivity> rule =
+            new ActivityTestRule<>(ShowActivity.class, true, true);
+    /**
+     * Runs before all tests and creates solo instance.
+     * @throws Exception
+     */
+    @Before
+    public void setUp() throws Exception{
+
+        solo = new Solo(InstrumentationRegistry.getInstrumentation(),rule.getActivity());
+    }
+    /**
+     * Gets the Activity
+     * @throws Exception
+     */
+    @Test
+    public void start() throws Exception{
+        Activity activity = rule.getActivity();
+    }
+    /**
+     * Add a city to the listview and check the city name using assertTrue
+     * Clear all the cities from the listview and check again with assertFalse
+     */
+    @Test
+    public void checkButton(){
+        // Asserts that the current activity is the Show Activity. Otherwise, show “Wrong Activity”
+        solo.assertCurrentActivity("Wrong Activity", ShowActivity.class);
+
+        solo.clickOnButton("MAIN"); //Click Button
+
+        solo.assertCurrentActivity("Wrong Activity", MainActivity.class);
+
+    }
+
+
+    /**
+     * Close activity after each test
+     * @throws Exception
+     */
+    @After
+    public void tearDown() throws Exception{
+        solo.finishOpenedActivities();
+    }
+}

app/src/main/AndroidManifest.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     package="com.example.simpleparadox.listycity">
 
     <application
@@ -9,10 +10,20 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name=".MainActivity">
+        <activity android:name=".MainActivity"
+            android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity android:name=".ShowActivity"
+            android:exported="true"
+            tools:ignore="DuplicateActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.SHOW" />
+
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>

app/src/main/java/com/example/simpleparadox/listycity/MainActivity.java

@@ -2,20 +2,16 @@
 
 import androidx.appcompat.app.AppCompatActivity;
 
+import android.content.Intent;
 import android.os.Bundle;
-import android.util.Log;
-import android.util.SparseBooleanArray;
 import android.view.View;
-import android.widget.AdapterView;
 import android.widget.ArrayAdapter;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.LinearLayout;
-import android.widget.ListAdapter;
 import android.widget.ListView;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 
 public class MainActivity extends AppCompatActivity {
 
@@ -71,6 +67,14 @@ public void onClick(View v) {
             }
         });
 
+        final Button gotoShowActivity = findViewById(R.id.button_goto_showActivity);
+        gotoShowActivity.setOnClickListener(new View.OnClickListener() {
+            public void onClick(View v) {
+                Intent intent2 = new Intent(MainActivity.this, ShowActivity.class);
+                startActivity(intent2);
+            }
+        });
+
     }
 
 

app/src/main/java/com/example/simpleparadox/listycity/ShowActivity.java

@@ -0,0 +1,27 @@
+package com.example.simpleparadox.listycity;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+
+public class ShowActivity extends AppCompatActivity {
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_show);
+
+
+        final Button gotoMainActivity = findViewById(R.id.button_goto_Main);
+        gotoMainActivity.setOnClickListener(new View.OnClickListener() {
+            public void onClick(View v) {
+                Intent intent = new Intent(ShowActivity.this, MainActivity.class);
+                startActivity(intent);
+            }
+        });
+
+    }
+
+}

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

@@ -14,15 +14,21 @@
 
         <Button
             android:id="@+id/button_add"
-            android:layout_width="180dp"
+            android:layout_width="100dp"
             android:layout_height="wrap_content"
             android:text="ADD CITY" />
 
         <Button
             android:id="@+id/button_clear"
-            android:layout_width="180dp"
+            android:layout_width="100dp"
             android:layout_height="wrap_content"
             android:text="ClEAR ALL" />
+
+        <Button
+            android:id="@+id/button_goto_showActivity"
+            android:layout_width="100dp"
+            android:layout_height="wrap_content"
+            android:text="NEW ACTIVITY" />
     </LinearLayout>
 
     <ListView

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

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    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:orientation="vertical"
+    tools:context=".ShowActivity">
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal">
+
+        <Button
+            android:id="@+id/button_goto_Main"
+            android:layout_width="100dp"
+            android:layout_height="wrap_content"
+            android:text="MAIN" />
+
+    </LinearLayout>
+
+</LinearLayout>