How to make bold text with Android Data Binding Library

Question

Pretty basic, I want to make a title of a message bold based on whether the text it is read or not. I can't seem to find a solution for this.

Here is my XML code:

            <TextView
                android:text="@{message.title}"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_alignParentStart="true"
                android:layout_alignParentTop="true"
                android:layout_marginBottom="5dp"
                android:layout_marginTop="5dp"
                android:layout_toLeftOf="@+id/timestamp"
                android:textSize="18sp"
                android:textStyle='@{message.isRead() ? "bold" : "normal"}'
                android:textColor='@{message.isRead() ? 0xff313131 : 0xff0662ab}' />

Th colorchange is working great, only the bold text is giving me some problems.

Error:Execution failed for task ':app:compileDebugJavaWithJavac'.

java.lang.RuntimeException: Found data binding errors. ****/ data binding error ****msg:Cannot find the setter for attribute 'android:textStyle' with parameter type java.lang.String on android.widget.TextView. file:D:......xml loc:39:41 - 39:79 ****\ data binding error ****

Answer 1

An easy way

public class TextViewBindingAdapter {
    @BindingAdapter("isBold")
    public static void setBold(TextView view, boolean isBold) {
        if (isBold) {
            view.setTypeface(null, Typeface.BOLD);
        } else {
            view.setTypeface(null, Typeface.NORMAL);
        }
    }
}

XML:

    <TextView
        android:id="@+id/text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:isBold="@{item.bold}"/>

Answer 2

I ended up using the following code, it implements DataBinding.

public abstract class BindingAdapter {
    @android.databinding.BindingAdapter("android:typeface")
    public static void setTypeface(TextView v, String style) {
        switch (style) {
            case "bold":
                v.setTypeface(null, Typeface.BOLD);
                break;
            default:
                v.setTypeface(null, Typeface.NORMAL);
                break;
        }
    }
}

And the XML

<TextView
    android:text="@{bericht.titel}"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:layout_marginBottom="5dp"
    android:layout_marginTop="5dp"
    android:layout_toLeftOf="@+id/timestamp"
    android:textSize="18sp"
    android:textColor='@{bericht.isGelezen() ? 0xff313131 : 0xff0662ab}'
    android:typeface='@{bericht.isGelezen() ? "normal" : "bold"}' />