Practical-12

Mobile Application

Practical List

Create an android program to send a message between two emulators and read messages from any one emulator (mobile).

Steps

1. Create a new Android project in Android Studio.
2. Open the activity_main.xml layout file.
3. Add two EditText elements to the layout with the following attributes:

   • android:id="@+id/editTextSender"

   • android:layout_width="match_parent"

   • android:layout_height="wrap_content"

   • android:hint="Enter message to send"

   • android:inputType="text"

   • android:layout_marginTop="16dp"

   • android:layout_marginBottom="16dp"

   • android:layout_marginStart="16dp"

   • android:layout_marginEnd="16dp"

   • android:imeOptions="actionSend"

   • android:maxLines="1"

   • android:singleLine="true"

   • android:textSize="16sp"

   • android:textColor="@android:color/black"

   • android:id="@+id/editTextReceiver"

   • android:layout_width="match_parent"

   • android:layout_height="wrap_content"

   • android:hint="Received message will be displayed here"

   • android:inputType="text"

   • android:layout_marginTop="16dp"

   • android:layout_marginBottom="16dp"

   • android:layout_marginStart="16dp"

   • android:layout_marginEnd="16dp"

   • android:imeOptions="actionDone"

   • android:maxLines="1"

   • android:singleLine="true"

   • android:textSize="16sp"

   • android:textColor="@android:color/black"

   • android:enabled="false"

4. Open the MainActivity.java file.
5. Inside the onCreate method, add the following code to set the content view to the activity_main.xml layout:

   setContentView(R.layout.activity_main);
6. Create a new method called sendMessage to send a message between two emulators:

   private void sendMessage() {
       EditText editTextSender = findViewById(R.id.editTextSender);
       EditText editTextReceiver = findViewById(R.id.editTextReceiver);
       String message = editTextSender.getText().toString();
       editTextReceiver.setText(message);
   }
7. Inside the onCreate method, add the following code to set the OnClickListener for the send button:

   Button sendButton = findViewById(R.id.sendButton);
   sendButton.setOnClickListener(new View.OnClickListener() {
       @Override
       public void onClick(View v) {
           sendMessage();
       }
   });
8. Run the application on two emulators or devices.
9. Enter a message in the sender emulator/device and click the send button.
10. The message should be displayed in the receiver emulator/device.