Marquee toolbar title not working when using proguard

Question

I'm trying to marquee title in toolbar, but the marquee is not working if I build it with proguard enable.

    Field f = toolbar.getClass().getDeclaredField("mTitleTextView");
    f.setAccessible(true);

    TextView titleTextView = (TextView) f.get(toolbar);
    titleTextView.setEllipsize(TextUtils.TruncateAt.MARQUEE);
    titleTextView.setMarqueeRepeatLimit(-1);
    titleTextView.setSelected(true);

Seem like "mTitleTextView" is obfuscated by proguard.

 java.lang.NoSuchFieldException: mTitleTextView
        at java.lang.Class.getDeclaredField(Class.java:631)

But it doesn't work, any idea?

Answer 1

You can instruct proguard not to touch private fields with following syntax:

    -keepclassmembers class android.widget.Toolbar {
        private android.widget.TextView mTitleTextView;   
    }

For the toolbar from support library:

    -keepclassmembers class android.support.v7.widget.Toolbar {
        private android.widget.TextView mTitleTextView;
     }

^{See this question for more details.}