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@GET("api/me/")
Observable<User> getLoggedUserProfile(@Header("token") String token);

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FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();

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public Observable<User> getLoggedUserProfile() {
    return callWithToken(resolvedToken -> api.getLoggedUserProfile(resolvedToken));
}

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tokenResolver.token().flatMap(token -> retrofit.getLoggedUserProfile(token)

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firebaseTokenObservable.flatMap(token -> retrofit.getLoggedUserProfile(token)

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private <T>Observable<T> callWithToken(Func1<String, Observable<T>> apiCall) {
    return tokenResolver
        .token()
        .flatMap(apiCall);
}

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dependencies {
    compile 'agency.tango.android:avatar-view:{latest_release}'

    //if you want to use Picasso for loading images
    compile 'agency.tango.android:avatar-view-picasso:{latest_release}'
}

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<agency.tango.android.avatarview.views.AvatarView
    android:layout_width="100dp"
    android:layout_height="100dp"
    app:av_border_color="@android:color/white"
    app:av_border_width="4dp"
    app:av_text_size_percentage="35" />

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AvatarView avatarView;
IImageLoader imageLoader;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    avatarView = (AvatarView) findViewById(R.id.avatar_view_example);

    imageLoader = new PicassoLoader();

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dependencies {
    compile 'agency.tango.android:avatar-view:{latest_release}'
    compile 'agency.tango.android:avatar-view-bindings:{latest_release}'

    //if you want to use Picasso for loading images
    compile 'agency.tango.android:avatar-view-picasso:{latest_release}'
}