1-on-1 Video Chat App with Java on Android
Tags: videosdk, videochatapp, androiddev, javadevelopment
Published: 2024-03-14 05:12:51

In this tutorial, You'll learn about a 1-on-1 Video Chat Application. Also, a Step-by-Step Guide for building an Android video chat application using Java and VideoSDK.

Remote communication has become the most important part of communication after the pandemic. It will likely play a significant role in the future too. Today's mobile applications often include voice or video chat functionality. But it's extremely complex and takes a lot of time to build. This is where [VideoSDK](https://www.videosdk.live/) comes into the picture.

VideoSDK is a platform that allows developers to create rich in-app experiences such as embedding real-time video, voice, real-time recording, live streaming, and real-time messaging.

VideoSDK is available for JavaScript, ReactJS, React-Native, IOS, Android, and Flutter to be integrated seamlessly. VideoSDK also provides a Pre-built SDK that enables the opportunity to integrate real-time communication with your application in just 10 minutes!

Let's create a 1-on-1 video chat/call app using VideoSDK. But first, we need to create a VideoSDK account and generate the token.

## Requirement
First of all, Your development environment should meet the following requirements:

[Java Development Kit](https://www.oracle.com/in/java/technologies/downloads/).
[Android Studio](https://developer.android.com/studio) 3.0 or later.
Android SDK API Level 21 or higher.
A mobile device that runs Android 5.0 or later.

## Setup the project

### STEP 1: Create a new project

Let’s start by creating a new project. In Android Studio, create a new project with an Empty Activity.

Then, provide a name. We will name it as OneToOneDemo.

### STEP 2: Integrate VideoSDK

Add the repository to `settings.gradle` file.

```
dependencyResolutionManagement{
  repositories {
    // ...
    google()
    mavenCentral()
    maven { url 'https://jitpack.io' }
    maven { url "https://maven.aliyun.com/repository/jcenter" }
  }
}
```
Add the following dependencies in `build.gradle` file.

```
dependencies {
  implementation 'live.videosdk:rtc-android-sdk:0.1.13'

  // library to perform Network call to generate a meeting id
  implementation 'com.amitshekhar.android:android-networking:1.0.2'

  // other app dependencies
  }
```
If your project has set `android.useAndroidX = true`, then set `android.enableJetifier = true` in the `gradle.properties` file to migrate your project to AndroidX and avoid duplicate class conflict.

### STEP 3: Add permissions to your project

In `/app/Manifests/AndroidManifest.xml`, add the following permissions after `</application>`.

```
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />
```

### STEP 4: Getting started with the code!
(a) 📋 Structure of project
We'll create two screens. The first screen will be the `Joining screen` that allows users to create/join the meeting, and another one is `Meeting screen` that will show participants like WhatsApp views.

Our project structure would look like this.

```
   app
   ├── java
   │    ├── packagename
   │         ├── JoinActivity
   │         ├── MeetingActivity
   ├── res
   │    ├── layout
   │    │    ├── activity_join.xml
   │    │    ├── activity_meeting.xml
```
**(b) Creating Joining Screen**
Create a new Activity named `JoinActivity`

**(c) Creating UI for Joining the Screen**
The Joining screen will include :

Create Button - Creates a new meeting.
TextField for MeetingID - Contains the `meetingId `you want to join.
Join Button - Joins the meeting with the `meetingId `provided.

In `/app/res/layout/activity_join.xml file`, replace the content with the following.

```
<?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:gravity="center"
    android:orientation="vertical"
    tools:context=".JoinActivity">

    <com.google.android.material.appbar.MaterialToolbar
        android:id="@+id/material_toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        app:contentInsetStart="0dp"
        android:background="?attr/colorPrimary"
        app:titleTextColor="@color/white" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="vertical">


        <Button
            android:id="@+id/btnCreateMeeting"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="16dp"
            android:text="Create Meeting" />

        <TextView
            style="@style/TextAppearance.AppCompat.Headline"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="OR" />

        <com.google.android.material.textfield.TextInputLayout        	style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginVertical="16dp"
            android:hint="Enter Meeting ID">

            <EditText
                android:id="@+id/etMeetingId"
                android:layout_width="250dp"
                android:layout_height="wrap_content" />
        </com.google.android.material.textfield.TextInputLayout>

        <Button
            android:id="@+id/btnJoinMeeting"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Join Meeting" />
    </LinearLayout>

</LinearLayout>
```

**(d) Integration of Create Meeting API**
You need to create a field `sampleToken `in `JoinActivity `that holds the generated token from the [VideoSDK dashboard](https://app.videosdk.live/api-keys). This token will be used in the VideoSDK config as well as generating meetingId.

```
public class JoinActivity extends AppCompatActivity {

  //Replace with the token you generated from the VideoSDK Dashboard
  private String sampleToken = ""; 

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    //...
  }
}
```
On Join Button `onClick `the event, it will navigate to `MeetingActivity `with token and meetingId.

```
public class JoinActivity extends AppCompatActivity {

  //Replace with the token you generated from the VideoSDK Dashboard
  private String sampleToken =""; 

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_join);

    final Button btnCreate = findViewById(R.id.btnCreateMeeting);
    final Button btnJoin = findViewById(R.id.btnJoinMeeting);
    final EditText etMeetingId = findViewById(R.id.etMeetingId);

    //set title
    Toolbar toolbar = findViewById(R.id.material_toolbar);
    toolbar.setTitle("OneToOneDemo");
    setSupportActionBar(toolbar);
        
    btnCreate.setOnClickListener(v -> {
      // we will explore this method in the next step
      createMeeting(sampleToken);
    });

    btnJoin.setOnClickListener(v -> {
      Intent intent = new Intent(JoinActivity.this, MeetingActivity.class);
      intent.putExtra("token", sampleToken);
      intent.putExtra("meetingId", etMeetingId.getText().toString());
      startActivity(intent);
    });
  }

  private void createMeeting(String token) {
  }
}
```
For the Create Button, under `createMeeting `method we will generate `meetingId `by calling API and navigating to `MeetingActivity `with token and generated meetingId.

```
public class JoinActivity extends AppCompatActivity {
  //...onCreate

  private void createMeeting(String token) {
      // we will make an API call to VideoSDK Server to get a roomId
      AndroidNetworking.post("https://api.videosdk.live/v2/rooms")
        .addHeaders("Authorization", token) //we will pass the token in the Headers
        .build()
        .getAsJSONObject(new JSONObjectRequestListener() {
            @Override
            public void onResponse(JSONObject response) {
                try {
                    // response will contain `roomId`
                    final String meetingId = response.getString("roomId");

                    // starting the MeetingActivity with received roomId and our sampleToken
                    Intent intent = new Intent(JoinActivity.this, MeetingActivity.class);
                    intent.putExtra("token", sampleToken);
                    intent.putExtra("meetingId", meetingId);
                    startActivity(intent);
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void onError(ANError anError) {
                anError.printStackTrace();
                Toast.makeText(JoinActivity.this, anError.getMessage(), Toast.LENGTH_SHORT).show();
            }
        });
  }
}
```
Our App is completely based on audio and video commutation, that's why we need to ask for runtime permissions `RECORD_AUDIO` and `CAMERA`. So, we will implement permission logic on `JoinActivity`.

```
public class JoinActivity extends AppCompatActivity {
  private static final int PERMISSION_REQ_ID = 22;

  private static final String[] REQUESTED_PERMISSIONS = {
    Manifest.permission.RECORD_AUDIO,
    Manifest.permission.CAMERA
  };

  private boolean checkSelfPermission(String permission, int requestCode) {
    if (ContextCompat.checkSelfPermission(this, permission) != PackageManager.PERMISSION_GRANTED) {
      ActivityCompat.requestPermissions(this, REQUESTED_PERMISSIONS, requestCode);
      return false;
    }
    return true;
  }

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    //... button listeneres
    checkSelfPermission(REQUESTED_PERMISSIONS[0], PERMISSION_REQ_ID);
    checkSelfPermission(REQUESTED_PERMISSIONS[1], PERMISSION_REQ_ID);
  }
}
```
You'll get `Unresolved reference: MeetingActivity` error, but don't worry. It will be solved automatically once you create `MeetingActivity`.

We're done with the Joining screen now, and it is time to create the participant's view in the Meeting screen.

### STEP 5: Creating Meeting Screen

Create a new Activity named `MeetingActivity`.

**(a) Creating the UI for Meeting Screen**
In `/app/res/layout/activity_meeting.xml` file, replace the content with the following.

```
<?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:id="@+id/mainLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:animateLayoutChanges="true"
    android:gravity="center"
    android:orientation="vertical"
    tools:context=".MeetingActivity">

    <com.google.android.material.appbar.MaterialToolbar
        android:id="@+id/material_toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@color/black"
        app:contentInsetStart="0dp"
        app:titleTextColor="@color/white">

        <LinearLayout
            android:id="@+id/meetingLayout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="14dp"
            android:layout_marginTop="10dp"
            android:orientation="horizontal">

            <RelativeLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content">

                <TextView
                    android:id="@+id/txtMeetingId"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:fontFamily="sans-serif-medium"
                    android:textColor="@color/white"
                    android:textFontWeight="600"
                    android:textSize="16sp" />

                <ImageButton
                    android:id="@+id/btnCopyContent"
                    android:layout_width="22dp"
                    android:layout_height="22sp"
                    android:layout_marginLeft="7dp"
                    android:layout_toRightOf="@+id/txtMeetingId"
                    android:backgroundTint="@color/black"
                    android:src="@drawable/ic_outline_content_copy_24" />

            </RelativeLayout>

        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="end"
            android:layout_marginEnd="10dp">

            <ImageButton
                android:id="@+id/btnSwitchCameraMode"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:background="@color/black"
                android:contentDescription="Switch Camera mode"
                android:src="@drawable/ic_baseline_flip_camera_android_24" />

        </LinearLayout>

    </com.google.android.material.appbar.MaterialToolbar>

    <FrameLayout
        android:id="@+id/participants_frameLayout"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="@color/black">

        <androidx.cardview.widget.CardView
            android:id="@+id/ParticipantCard"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginLeft="12dp"
            android:layout_marginTop="3dp"
            android:layout_marginRight="12dp"
            android:layout_marginBottom="3dp"
            android:backgroundTint="#2B3034"
            android:visibility="gone"
            app:cardCornerRadius="8dp"
            app:strokeColor="#2B3034">

            <ImageView
                android:layout_width="150dp"
                android:layout_height="150dp"
                android:layout_gravity="center"
                android:src="@drawable/ic_baseline_person_24" />

            <live.videosdk.rtc.android.VideoView
                android:id="@+id/participantView"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:visibility="gone" />

        </androidx.cardview.widget.CardView>

        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        </FrameLayout>

        <androidx.cardview.widget.CardView
            android:id="@+id/LocalCard"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginLeft="12dp"
            android:layout_marginTop="3dp"
            android:layout_marginRight="12dp"
            android:layout_marginBottom="3dp"
            android:backgroundTint="#1A1C22"
            app:cardCornerRadius="8dp"
            app:strokeColor="#1A1C22">

            <ImageView
                android:id="@+id/localParticipant_img"
                android:layout_width="150dp"
                android:layout_height="150dp"
                android:layout_gravity="center"
                android:src="@drawable/ic_baseline_person_24" />

            <live.videosdk.rtc.android.VideoView
                android:id="@+id/localView"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:visibility="gone" />

        </androidx.cardview.widget.CardView>

    </FrameLayout>
    
    <!-- add bottombar here-->

</LinearLayout>
```

```
<com.google.android.material.bottomappbar.BottomAppBar
        android:id="@+id/bottomAppbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:animateLayoutChanges="true"
        android:backgroundTint="@color/black"
        android:gravity="center_horizontal"
        android:paddingVertical="5dp"
        tools:ignore="BottomAppBar">

        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:paddingStart="16dp"
            android:paddingEnd="16dp">

            <com.google.android.material.floatingactionbutton.FloatingActionButton
                android:id="@+id/btnLeave"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:contentDescription="Leave Meeting"
                android:src="@drawable/ic_end_call"
                app:backgroundTint="#FF5D5D"
                app:fabSize="normal"
                app:tint="@color/white" />

            <com.google.android.material.floatingactionbutton.FloatingActionButton
                android:id="@+id/btnMic"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginStart="90dp"
                android:layout_toEndOf="@+id/btnLeave"
                android:contentDescription="Toggle Mic"
                android:src="@drawable/ic_mic_off"
                app:backgroundTint="@color/white"
                app:borderWidth="1dp"
                app:fabSize="normal" />

            <com.google.android.material.floatingactionbutton.FloatingActionButton
                android:id="@+id/btnWebcam"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginStart="90dp"
                android:layout_toEndOf="@+id/btnMic"
                android:backgroundTint="@color/white"
                android:contentDescription="Toggle Camera"
                android:src="@drawable/ic_video_camera_off"
                app:backgroundTint="@color/white"
                app:borderWidth="1dp"
                app:fabSize="normal" />

        </RelativeLayout>

    </com.google.android.material.bottomappbar.BottomAppBar>


```
Copy the required icons from [here ](https://github.com/videosdk-live/videosdk-rtc-android-kotlin-sdk-example/tree/one-to-one-demo/app/src/main/res/drawable)and paste into your project's `res/drawable` folder.

**(b) Initializing the Meeting**
After getting the token and `meetingId `from `JoinActivity`, we need to...

Initialize VideoSDK
Configure VideoSDK with the token.
Initialize the meeting with required params such as `meetingId`, `participantName`, `micEnabled`, `webcamEnabled`, `participantId `and map of `CustomStreamTrack`.
Join the room with `meeting.join()` method

```
public class MeetingActivity extends AppCompatActivity {

    private static Meeting meeting;
    private boolean micEnabled = true;
    private boolean webcamEnabled = true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_meeting);

        //
        Toolbar toolbar = findViewById(R.id.material_toolbar);
        toolbar.setTitle("");
        setSupportActionBar(toolbar);

        //
        String token = getIntent().getStringExtra("token");
        final String meetingId = getIntent().getStringExtra("meetingId");

        // set participant name
        String localParticipantName = "Alex";

        // Initialize VideoSDK
        VideoSDK.initialize(getApplicationContext());

        // pass the token generated from api server
        VideoSDK.config(token);

        // create a new meeting instance
        meeting = VideoSDK.initMeeting(
                MeetingActivity.this, meetingId, localParticipantName,
                micEnabled, webcamEnabled, null, null
        );

        // join the meeting
        if (meeting != null) meeting.join();

        //
        TextView textMeetingId = findViewById(R.id.txtMeetingId);
        textMeetingId.setText(meetingId);

	 // copy meetingId to clipboard
         ((ImageButton) findViewById(R.id.btnCopyContent)).setOnClickListener(v -> copyTextToClipboard(meetingId));

   }
      
      private void copyTextToClipboard(String text) {
        ClipboardManager clipboard = (ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE);
        ClipData clip = ClipData.newPlainText("Copied text", text);
        clipboard.setPrimaryClip(clip);

        Toast.makeText(MeetingActivity.this, "Copied to clipboard!", Toast.LENGTH_SHORT).show();
    }

}
```

### STEP 6: Handle Local Participant Media

We need to implement clicks for the following `Views`:

Mic Button
Webcam Button
Switch Camera Button
Leave Button
Add the following implementation:

```
public class MeetingActivity extends AppCompatActivity {

	private FloatingActionButton btnWebcam, btnMic, btnLeave;
    private ImageButton btnSwitchCameraMode;
    
  @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_meeting);
    
    //
    btnMic = findViewById(R.id.btnMic);
    btnWebcam = findViewById(R.id.btnWebcam);
    btnLeave = findViewById(R.id.btnLeave);
    btnSwitchCameraMode = findViewById(R.id.btnSwitchCameraMode);
        
    //...

    // actions
    setActionListeners();
  }
  
  private void setActionListeners() {
        // Toggle mic
        btnMic.setOnClickListener(view -> toggleMic());

        // Toggle webcam
        btnWebcam.setOnClickListener(view -> toggleWebCam());
        
        // Leave meeting
        btnLeave.setOnClickListener(view -> {
            // this will make the local participant leave the meeting
            meeting.leave();
        });

        // Switch camera
        btnSwitchCameraMode.setOnClickListener(view -> {
            //a participant can change stream from front/rear camera during the meeting.
            meeting.changeWebcam();
        });
    
   }
}
```

```
private void toggleMic() {
        if (micEnabled) {
            // this will mute the local participant's mic
            meeting.muteMic();
        } else {
            // this will unmute the local participant's mic
            meeting.unmuteMic();
        }
        micEnabled = !micEnabled;
        // change mic icon according to micEnable status
        toggleMicIcon();
    }

    @SuppressLint("ResourceType")
    private void toggleMicIcon() {
        if (micEnabled) {
            btnMic.setImageResource(R.drawable.ic_mic_on);
            btnMic.setColorFilter(Color.WHITE);
            Drawable buttonDrawable = btnMic.getBackground();
            buttonDrawable = DrawableCompat.wrap(buttonDrawable);
            //the color is a direct color int and not a color resource
            if (buttonDrawable != null) DrawableCompat.setTint(buttonDrawable, Color.TRANSPARENT);
            btnMic.setBackground(buttonDrawable);

        } else {
            btnMic.setImageResource(R.drawable.ic_mic_off);
            btnMic.setColorFilter(Color.BLACK);
            Drawable buttonDrawable = btnMic.getBackground();
            buttonDrawable = DrawableCompat.wrap(buttonDrawable);
            //the color is a direct color int and not a color resource
            if (buttonDrawable != null) DrawableCompat.setTint(buttonDrawable, Color.WHITE);
            btnMic.setBackground(buttonDrawable);
        }
    }
```

```
private void toggleWebCam() {
        if (webcamEnabled) {
            // this will disable the local participant webcam
            meeting.disableWebcam();
        } else {
            // this will enable the local participant webcam
            meeting.enableWebcam();
        }
        webcamEnabled = !webcamEnabled;
        // change webCam icon according to webcamEnabled status
        toggleWebcamIcon();
    }

    @SuppressLint("ResourceType")
    private void toggleWebcamIcon() {
        if (webcamEnabled) {
            btnWebcam.setImageResource(R.drawable.ic_video_camera);
            btnWebcam.setColorFilter(Color.WHITE);
            Drawable buttonDrawable = btnWebcam.getBackground();
            buttonDrawable = DrawableCompat.wrap(buttonDrawable);
            //the color is a direct color int and not a color resource
            if (buttonDrawable != null) DrawableCompat.setTint(buttonDrawable, Color.TRANSPARENT);
            btnWebcam.setBackground(buttonDrawable);

        } else {
            btnWebcam.setImageResource(R.drawable.ic_video_camera_off);
            btnWebcam.setColorFilter(Color.BLACK);
            Drawable buttonDrawable = btnWebcam.getBackground();
            buttonDrawable = DrawableCompat.wrap(buttonDrawable);
            //the color is a direct color int and not a color resource
            if (buttonDrawable != null) DrawableCompat.setTint(buttonDrawable, Color.WHITE);
            btnWebcam.setBackground(buttonDrawable);
        }
    }
```

**(a) Setting up Local participant view
To set up participant view, we have to implement all the methods of the `ParticipantEventListener `Abstract Class and add the listener to `Participant `class using the `addEventListener()` method of `Participant `Class. `ParticipantEventListener `class has two methods :

`onStreamEnabled `- Whenever a participant enables mic/webcam in the meeting, This event will be triggered and return `Stream`.
`onStreamDisabled` - Whenever a participant disables mic/webcam in the meeting, This event will be triggered and return `Stream`.

```
public class MeetingActivity extends AppCompatActivity {

    private VideoView localView;
    private VideoView participantView;
    private CardView localCard, participantCard;
    private ImageView localParticipantImg;
    
  @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_meeting);
    
    //... 
    
    localCard = findViewById(R.id.LocalCard);
    participantCard = findViewById(R.id.ParticipantCard);
    localView = findViewById(R.id.localView);
    participantView = findViewById(R.id.localParticipant);
    localParticipantImg = findViewById(R.id.localParticipant_img);
        
    //...

    // setup local participant view
    setLocalListeners();
  }

  private void setLocalListeners() {
        meeting.getLocalParticipant().addEventListener(new ParticipantEventListener() {
            @Override
            public void onStreamEnabled(Stream stream) {
                if (stream.getKind().equalsIgnoreCase("video")) {
                    VideoTrack track = (VideoTrack) stream.getTrack();
                    localView.setVisibility(View.VISIBLE);
                    localView.addTrack(track);
                    localView.setZOrderMediaOverlay(true);
                    localCard.bringToFront();
                }
            }

            @Override
            public void onStreamDisabled(Stream stream) {
                if (stream.getKind().equalsIgnoreCase("video")) {
                    localView.removeTrack();
                    localView.setVisibility(View.GONE);
                }
            }
        });
    }
}
```
**(b) Setting up Remote participant view**

```
private final ParticipantEventListener participantEventListener = new ParticipantEventListener() {
        // trigger when participant enabled mic/webcam
        @Override
        public void onStreamEnabled(Stream stream) {
            if (stream.getKind().equalsIgnoreCase("video")) {
                localView.setZOrderMediaOverlay(true);
                localCard.bringToFront();
                VideoTrack track = (VideoTrack) stream.getTrack();
                participantView.setVisibility(View.VISIBLE);
                participantView.addTrack(track);
            }
        }

        // trigger when participant disabled mic/webcam
        @Override
        public void onStreamDisabled(Stream stream) {
            if (stream.getKind().equalsIgnoreCase("video")) {
                participantView.removeTrack();
                participantView.setVisibility(View.GONE);
            }
        }
    };

```
**(c) Handle meeting events & manage participant's view**
Add `MeetingEventListener `for listening events such as Meeting Join/Left and Participant Join/Lef.

```
public class MeetingActivity extends AppCompatActivity {
  @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_meeting);
    //...

    // handle meeting events
    meeting.addEventListener(meetingEventListener);
  }
  
  private final MeetingEventListener meetingEventListener = new MeetingEventListener() {
        @Override
        public void onMeetingJoined() {
            // change mic,webCam icon after meeting successfully joined
            toggleMicIcon();
            toggleWebcamIcon();
        }

        @Override
        public void onMeetingLeft() {
            if (!isDestroyed()) {
                Intent intent = new Intent(MeetingActivity.this, JoinActivity.class);
                startActivity(intent);
                finish();
            }
        }

        @Override
        public void onParticipantJoined(Participant participant) {
            // Display local participant as miniView when other participant joined
            changeLocalParticipantView(true);
            Toast.makeText(MeetingActivity.this, participant.getDisplayName() + " joined",
                    Toast.LENGTH_SHORT).show();
            participant.addEventListener(participantEventListener);
        }

        @Override
        public void onParticipantLeft(Participant participant) {
            // Display local participant as largeView when other participant left
            changeLocalParticipantView(false);
            Toast.makeText(MeetingActivity.this, participant.getDisplayName() + " left",
                    Toast.LENGTH_SHORT).show();
        }
    };
}
```
`changeLocalParticipantView(isMiniView: Boolean)` function first checks whether the video of a local participant is displayed as a MiniView or a LargeView.
If the meeting has only one participant (local participant), then the local participant is displayed as LargeView.
When another participant (other than the local participant) joins, `changeLocalParticipantView(true)` is called. As a result, the local participant is shown as MiniView, while the other participant is shown as LargeView.

```
private void changeLocalParticipantView(boolean isMiniView) {
        if(isMiniView)
        {
            // show localCard as miniView
            localCard.setLayoutParams(new CardView.LayoutParams(300, 430, Gravity.RIGHT | Gravity.BOTTOM));
            ViewGroup.MarginLayoutParams cardViewMarginParams = (ViewGroup.MarginLayoutParams) localCard.getLayoutParams();
            cardViewMarginParams.setMargins(30, 0, 60, 40);
            localCard.requestLayout();
            // set height-width of localParticipant_img
            localParticipantImg.setLayoutParams(new FrameLayout.LayoutParams(150, 150, Gravity.CENTER));
            participantCard.setVisibility(View.VISIBLE);
        }else{
            // show localCard as largeView
            localCard.setLayoutParams(new CardView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
            ViewGroup.MarginLayoutParams cardViewMarginParams = (ViewGroup.MarginLayoutParams) localCard.getLayoutParams();
            cardViewMarginParams.setMargins(30, 5, 30, 30);
            localCard.requestLayout();
            // set height-width of localParticipant_img
            localParticipantImg.setLayoutParams(new FrameLayout.LayoutParams(400, 400, Gravity.CENTER));
            participantCard.setVisibility(View.GONE);
        }
    }
```
**(d) Destroying everything**
We need to release resources when the app is closed and is no longer being used. Override the `onDestroy `with the following code:

```
protected void onDestroy() {
        if(meeting !=null)
        {
            meeting.removeAllListeners();
            meeting.getLocalParticipant().removeAllListeners();
            meeting.leave();
            meeting = null;
        }
        if (participantView != null) {
            participantView.setVisibility(View.GONE);
            participantView.releaseSurfaceViewRenderer();
        }

        if (localView != null) {
            localView.setVisibility(View.GONE);
            localView.releaseSurfaceViewRenderer();
        }

        super.onDestroy();
    }
```

`java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.`
If you face this error at Runtime, Include these lines in `theme.xml` file.
`<item name="windowActionBar">false</item>`
`<item name="windowNoTitle">true</item>`

## App Demo
Tadaa!! Our app is ready. Easy, isn't it?
Install and run the app on two different devices and make sure that they are connected to the internet.

This app only supports 2 participants, it does not manage more than 2 participants. If you want to handle more than 2 participant then check out our Group call example [HERE](rtc-android-java-sdk-example).

## Conclusion
In this blog, we have learned what videoSDK is, how to obtain an access token from the [VideoSDK Dashboard](https://app.videosdk.live/api-keys), and how to create a one-to-one video chat app with the VideoSDK.
Go ahead and create advanced features like screen-sharing, chat, and others. [Browse Our Documentation](https://docs.videosdk.live/).
To see the full implementation of the app, check out this [GitHub Repository](https://github.com/videosdk-live/videosdk-rtc-android-java-sdk-example/tree/one-to-one-demo).
If you face any problems or have questions, please join our [Discord Community](https://discord.com/invite/Gpmj6eCq5u).