How do I format a double using Android view data bindings?

Question

Say I have an Earthquake class which has a field public final double magnitude;, and I have a layout similar to this one:

<layout xmlns:android="http://schemas.android.com/apk/res/android">
    <data>
        <variable name="earthquake" type="com.example.Earthquake"/>
    </data>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="48dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:text="@{String.format(earthquake.magnitude)}" />
        ...
    </LinearLayout>
</layout>

Note I have to use "@{String.format(earthquake.magnitude)}" to use this field, else I get this error:

Cannot find the setter for attribute 'android:text' on android.widget.TextView with parameter type double.

Unfortunately, this results in the double being printed at full accuracy. How can I format the double value that is shown?

Answer 1

I haven't yet looked at the binding expression language in the M SDK preview, so I might be jumping to conclusions, but if this calls through to the normal String.format() method, then it requires a pattern. Have you tried this?

android:text='@{String.format("%.1f", earthquake.magnitude)}'

Answer 2

String.valueOf() is also an option:

android:text="@{String.valueOf(earthquake.magnitude)}"