# Mobile Application - Messenger

# Messenger
activity_create_message.xml
<pre><code>
<?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:padding="16dp"
android:orientation="vertical"
tools:context=".CreateMessageActivity"
>
<EditText
android:id="@+id/message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:hint="@string/hint"
android:ems="10"
/>
<Button
android:id="@+id/send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:onClick="onSendMessage"
android:text="@string/send"
/>
</LinearLayout>
</code></pre>

strings.xml
<pre><code>
<string name="send">Send Message</string>
<string name="hint">Enter a message</string>
</code></pre>

###### [hint] implements a public method "onSendMessage" of CreateMessageActivity class
<pre><code>
import android.content.Intent;

public void onSendMessage(View view) { }
</code></pre>

CreateMessageActivity.java
<pre><code>
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_message);
}

public void onSendMessage(View view) {
Intent intent = new Intent(this, ReceiveMessageActivity.class);
startActivity(intent);
}
</code></pre>
### Send Message from the activity (CreateMessageActivity) to other activity (ReceiveMessageActivity)
create a Empty activity and give a name "ReceiveMessageActivity.java"
activity_receive_message.xml
<pre><code>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:padding="16dp"
android:orientation="vertical"
tools:context=".ReceiveMessageActivity">
<TextView
android:id="@+id/message"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
</code></pre>

### ReceiveMessageActivity.java
get the information of the intent
<pre><code>
public class ReceiveMessageActivity extends Activity {
public static final String EXTRA_MESSAGE = "message";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_receive_message);
Intent intent = getIntent();
String messageText = intent.getStringExtra(EXTRA_MESSAGE);
TextView messageView = (TextView) findViewById(R.id.message);
messageView.setText(messageText);
}
}
</code></pre>

### CreateMessageActivity.java
put extra message and send the intent
<pre><code>
public void onSendMessage(View view) {
EditText messageView = (EditText) findViewById(R.id.message);
String messageText = messageView.getText().toString();
Intent intent = new Intent(this, ReceiveMessageActivity.class);
intent.putExtra(ReceiveMessageActivity.EXTRA_MESSAGE, messageText);
startActivity(intent);
}
</code></pre>

# Trigger by Extra Activity with a action of the intent
<pre><code>
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("text/plain");
intent.putExtra(Intent.EXTRA_TEXT, messageText);
</code></pre>