This is a simple app with a tag navigation. And I can’t open it with getting a mistake. A part of it is:
Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead. at androidx.appcompat.app.AppCompatDelegateImpl.setSupportActionBar(AppCompatDelegateImpl.java:572) at androidx.appcompat.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:159) at com.example.tabexperiment.MainActivity.onCreate(MainActivity.java:29)
And here is a 28-th and 29-th lines in MainActivity(the message above says mistake is in 29-th line):
androidx.appcompat.widget.Toolbar toolbar = findViewById(R.id.toolbar); setSupportActionBar(toolbar);
I tried to cope with the problem but all what I found is that I should add this code in themes file:
<item name="windowActionBar">false</item> <item name="windowNoTitle">true</item>
and this line in Manifest:
android:theme="@style/Theme.TabExperiment"
So, I have that in my code but nothing is still working. Help me, please.
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Answer
you can use this:
<style name="NoActionBarTheme" parent="Theme.AppCompat.Light.NoActionBar"> <item name="colorPrimary">@color/colorPrimary</item> <item name="colorPrimaryDark">@color/colorPrimaryDark</item> <item name="colorAccent">@color/colorAccent</item> <item name="windowActionBar">false</item> <item name="windowNoTitle">true</item> </style>
OR
<activity android:name=".activity.YourActivity" android:theme="@style/AppTheme.NoActionBar"/>