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package com.google.ara.app.manager;

import java.util.List;

public class NameJoiner {

    private NameJoiner() {
    }

    public static String join(List<String> names, int index, String... separators) {

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import android.content.Intent;
import android.view.View;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    ...  
    public void tomarFoto(View view) {
        Intent intent = new Intent(this, CameraActivity.class);
        startActivity(intent);

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<manifest ... >
    <uses-feature android:name="android.hardware.camera"
                  android:required="true" />
    ...
</manifest>

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import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ImageView;

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import android.os.AsyncTask;
import android.widget.TextView;

public class CameraActivity extends AppCompatActivity {
    ...
    private TextView progress;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ...

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public void someMethod() {
    bus.post(new SomeKindOfEvent(optionalParam1, optionalParam2));
}

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@Subscribe
public void someAppropriateName(SomeKindOfEvent event) {
     //Your action here
}

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//MainActivity.java
public class MainActivity extends AppCompatActivity {
    private MainPresenter presenter;
    //Simply a singleton of Bus
    private Bus bus = BusManager.getInstance(); 
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);

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public class MainPresenter {
    private final MainModel model;
    private final MainView view;

    public MainPresenter(MainView view, MainModel model) {
        this.view = view;
        this.model = model;
    }
}

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public class MainView {
    private final Bus bus;
    private WeakReference<AppCompatActivity> activityRef;
  
    public MainView(AppCompatActivityactivity, Bus bus) {
        activityRef = new WeakReference<>(activity);
        this.bus = bus;
    }

    @Nullable