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public abstract class BaseActivity extends AppCompatActivity {

    @Override
    protected void onDestroy() {
        super.onDestroy();
        RxBus.unregister(this);
    }
}

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public abstract class BaseFragment extends Fragment {

    @Override
    public void onDestroy() {
        super.onDestroy();
        RxBus.unregister(this);
    }
}

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public class DatabaseUpgradeHelper extends DaoMaster.OpenHelper {

    public DatabaseUpgradeHelper(Context context, String name) {
        super(context, name);
    }

    @Override
    public void onUpgrade(Database db, int oldVersion, int newVersion) {
        List<Migration> migrations = getMigrations();

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@Module
public class BusModule {

    public static final String PROVIDER_TOP_SUBJECT = "PROVIDER_TOP_SUBJECT";
    public static final String PROVIDER_BOTTOM_SUBJECT = "PROVIDER_BOTTOM_SUBJECT";

    @Provides
    @Singleton
    @Named(PROVIDER_TOP_SUBJECT)
    static PublishSubject<String> provideTopSubject() {

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@Component(modules = BusModule.class)
@Singleton
public interface BusComponent {

    @Named(BusModule.PROVIDER_TOP_SUBJECT)
    PublishSubject<String> getTopSubject();

    @Named(BusModule.PROVIDER_BOTTOM_SUBJECT)
    PublishSubject<String> getBottomSubject();
}

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public class App extends Application {
    
    private static BusComponent sBusComponent;

    @Override
    public void onCreate() {
        super.onCreate();
        sBusComponent = DaggerBusComponent.create();
    }

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//Subscribe to a subject
App.getBusComponent().getTopSubject().subscribe((message) -> {
            if (mMessageView != null) {
                mMessageView.setText(message);
            }
        });

//Send an item to subscribers of a subject
App.getBusComponent().getBottomSubject().onNext("Hello!");

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List<String> dataList;
//dataList gets populated here

List<DataModel> result = new ArrayList<>();
for (String data : dataList) {
    result.add(DataParser.createData(data));
}

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<activity
    android:name=".activity.MainEmptyActivity"
    android:theme="@android:style/Theme.NoDisplay">
    <intent-filter>
        <action android:name="android.intent.action.MAIN"/>

        <category android:name="android.intent.category.LAUNCHER"/>
    </intent-filter>
</activity>

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public class CustomView extends LinearLayout {

    public CustomView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        setOrientation(LinearLayout.VERTICAL);
        LayoutInflater.from(context).inflate(R.layout.customview, this, true);

        String title;
        String subtitle;
        TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CustomView, 0, 0);