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?

azizbekian · Accepted Answer · 2017-12-02T06:33:49.110

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.}

edited Dec 02 '17 at 06:33

answered Dec 01 '17 at 06:38

azizbekian

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Helpful: (https://stackoverflow.com/questions/23365021/how-to-tell-proguard-to-keep-private-fields-without-specifying-each-field) – ColinWa Nov 08 '18 at 11:33

score 1 · Answer 2 · answered Oct 25 '18 at 08:36

Avoid doing reflection. Private field names can change at any time, not to mention that using reflection is slow! Also, from Android 9 Pie (API 28), they're locking down API access so it's not a long-term solution.

Instead, define your own Toolbar in a layout instead. See this question and this answer.

Marquee toolbar title not working when using proguard

2 Answers2