Android Error [Attempt to invoke virtual method 'void android.app.ActionBar' on a null object reference]

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误落风尘
误落风尘 2020-11-28 22:13

I have a code module which implements viewpager with navigation drawer, however, when I run the code I get the following error

01-26 09:20:02.958: D/AndroidR         


        
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  •  无人及你
    2020-11-28 22:45

    when you extend appcompatActivity then use

    this.getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    

    and when you extend ActionBar then use

    this.getActionBar().setDisplayHomeAsUpEnabled(true);
    

    dont forget to call this function in oncreate after initializing the toolbar/actionbar

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