Best Way to Get the View's Great Great Grand Parent View?

Question

I need to obtain a reference to the great great grandparent's view. Currently I am doing it successfully using the following code:

FabToolbar fabToolbar = (FabToolbar) view.getParent().getParent().getParent().getParent();

This seems somewhat ridiculous, or, is it just the way it's done?

The reason I did it this way was due to my preference to want to use data binding in my layout, and my inability to obtain a reference to any view but the view being clicked. This is given the following code you will see below, ex:

@{(view) -> viewModel.onClickPart(view)}

The view being passed into the method is the MaterialIconView, this appears to be the only view I can reference, or is there a way to pass additional parameters to this method? My full layout is as below, please keep in mind that FabToolbar contains a LinearLayout child and a RelativeLayout child, hence why you see four calls to getParent() and not two (looking at the layout below).

<com.bowyer.app.fabtoolbar.FabToolbar
            android:id="@+id/fab_toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            app:tb_anim_duration="400"
            app:tb_color="@color/primary"
            app:tb_container_gravity="center"
            app:tb_fab_type="normal">

        <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@color/accent"
                android:gravity="center"
                android:orientation="horizontal">

            <net.steamcrafted.materialiconlib.MaterialIconView
                    android:id="@+id/ic_part"
                    android:layout_width="48dp"
                    android:layout_height="48dp"
                    android:onClick="@{(view) -> viewModel.onClickPart(view)}"
                    android:layout_marginLeft="@dimen/content_space"
                    android:layout_marginRight="@dimen/content_space"
                    android:background="@null"
                    android:scaleType="center"
                    app:materialIcon="engine"
                    app:materialIconColor="#fff"
                    app:materialIconSize="24dp"
                    />

            <net.steamcrafted.materialiconlib.MaterialIconView
                    android:id="@+id/ic_dyno"
                    android:layout_width="48dp"
                    android:layout_height="48dp"
                    android:onClick="@{(view) -> viewModel.onClickDyno(view)}"
                    android:layout_marginLeft="@dimen/content_space"
                    android:layout_marginRight="@dimen/content_space"
                    android:background="@null"
                    android:scaleType="center"
                    app:materialIcon="chart_line"
                    app:materialIconColor="#fff"
                    app:materialIconSize="24dp"
                    />

            <net.steamcrafted.materialiconlib.MaterialIconView
                    android:id="@+id/ic_timeslip"
                    android:layout_width="48dp"
                    android:layout_height="48dp"
                    android:onClick="@{(view) -> viewModel.onClickTimeslip(view)}"
                    android:layout_marginLeft="@dimen/content_space"
                    android:layout_marginRight="@dimen/content_space"
                    android:background="@null"
                    android:scaleType="center"
                    app:materialIcon="timer_10"
                    app:materialIconColor="#fff"
                    app:materialIconSize="24dp"
                    />

            <net.steamcrafted.materialiconlib.MaterialIconView
                    android:id="@+id/ic_laptime"
                    android:layout_width="48dp"
                    android:onClick="@{(view) -> viewModel.onClickLaptime(view)}"
                    android:layout_height="48dp"
                    android:layout_marginLeft="@dimen/content_space"
                    android:layout_marginRight="@dimen/content_space"
                    android:background="@null"
                    android:scaleType="center"
                    app:materialIcon="timer"
                    app:materialIconColor="#fff"
                    app:materialIconSize="24dp"
                    />

            <net.steamcrafted.materialiconlib.MaterialIconView
                    android:id="@+id/ic_fuel"
                    android:layout_width="48dp"
                    android:onClick="@{(view) -> viewModel.onClickFuel(view)}"
                    android:layout_height="48dp"
                    android:layout_marginLeft="@dimen/content_space"
                    android:layout_marginRight="@dimen/content_space"
                    android:background="@null"
                    android:scaleType="center"
                    app:materialIcon="gas_station"
                    app:materialIconColor="#fff"
                    app:materialIconSize="24dp"
                    />

            <net.steamcrafted.materialiconlib.MaterialIconView
                    android:id="@+id/ic_repair"
                    android:layout_width="48dp"
                    android:layout_height="48dp"
                    android:onClick="@{(view) -> viewModel.onClickRepair(view)}"
                    android:layout_marginLeft="@dimen/content_space"
                    android:layout_marginRight="@dimen/content_space"
                    android:background="@null"
                    android:scaleType="center"
                    app:materialIcon="wrench"
                    app:materialIconColor="#fff"
                    app:materialIconSize="24dp"
                    />
        </LinearLayout>

    </com.bowyer.app.fabtoolbar.FabToolbar>

Thank you for the advice.

Answer 1

You can pass other Views from your layout with DataBinding :

<com.bowyer.app.fabtoolbar.FabToolbar
        android:id="@+id/fab_toolbar">

    <LinearLayout>

        <net.steamcrafted.materialiconlib.MaterialIconView
                android:id="@+id/ic_part"
                android:onClick="@{(view) -> viewModel.onClickPart(view, fabToolbar)}"/>

    </LinearLayout>

</com.bowyer.app.fabtoolbar.FabToolbar>

In your ViewModel :

public void onClickPart(View view, FabToolbar fabToolbar){ ... }

You need to use the camel case writing for any referenced view in data binding.

You can also pass properties of a view like that. (for example Visibility , isChecked , ... )

Here is an article from George Mount where he uses this (under "View attributes"). (Only for other properties, but I think you'll get the idea)