How to fix getActionBar method may produce java.lang.NullPointerException

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醉酒成梦
醉酒成梦 2020-12-02 18:06

I am using a toolbar as my actionbar in an activity. I am trying to add the method getActionBar().setDisplayHomeAsUpEnabled(true); to the Activity.java file fo

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  •  甜味超标
    2020-12-02 18:40

    use this theme: android:theme="@style/Theme.AppCompat.Light.NoActionBar"

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    toolbar.setTitle("Title");
    setSupportActionBar(toolbar);
    ActionBar actionBar = getSupportActionBar();
    actionBar.setHomeButtonEnabled(true);
    actionBar.setHomeAsUpIndicator(R.drawable.ic_action_previous_item);
    actionBar.setDisplayHomeAsUpEnabled(true);
    

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