hamburger icon display in release build in place of back icon if move from one fragment to another fragment

user_6720648 0
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I am using Navigation Architecture.

For debug build :

debug {
        debuggable true
        minifyEnabled false
        useProguard false
    }

and For release build :-

 release {

        minifyEnabled true
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
  1. I am using navigation drawer and when app is opened show hamburger icon in Toolbar. Thanks in advance for help.
  2. But when I am moving from one fragment to another fragment . I have to show back icon(Navigation back).
  3. In debug build it works fine.
  4. But in release build ,hamburger icon is showing in toolbar in place of back icon.

But I need to show back icon in place of hamburger icon in release build.

navigation-drawer android-architecture-navigation android-architecture-components android
2 Answers

I ran into this, I inspected logs and found an error that suggested something went wrong with obfuscation of hamburger/back arrow drawable in the toolbar. It said something like - startAnimation method could not be found.

Now I dont really know whats the real problem behind it, I just added these lines in proguard file and it worked again: 

-keep class androidx.appcompat.app.ActionBarDrawerToggle{}

-keep class androidx.appcompat.graphics.drawable.DrawerArrowDrawable{ *; }
user_68556030

Update for anyone looking at this recently as I was, updating to the latest Navigation Component library solved this for me (2.3.1 at the time of writing this).

user_87903900
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