Question 247511 in Android Studio Question posted in
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I don't have a title bar in Android studio. When I press the Show System UI button, my title bar does not appear

Look the image:
image: enter image description here

I don’t know what code this is caused by. That’s why I will only share themes.xml codes.

//Themes.xml

<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Base application theme. -->
    <style name="Base.Theme.TitleBarSettings" parent="Theme.Material3.DayNight.NoActionBar">
        <!-- Customize your light theme here. -->
        <!-- <item name="colorPrimary">@color/my_light_primary</item> -->
    </style>

    <style name="Theme.TitleBarSettings" parent="Base.Theme.TitleBarSettings" />
</resources>
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2

Answers


  1. 0 
     <style name="Base.Theme.TitleBarSettings" parent="Theme.Material3.DayNight.NoActionBar">

    You have set NoActionBar theme. Thats why it is not appearing.

    use this as your parent theme:

    parent="Theme.AppCompat.Light.DarkActionBar"

    It will have actionbar with the app name but it will not have 3 dotted menu on the right side.

    For changing the color of the ActionBar add following code in your onCreate of the mainActivity.

    // Define ActionBar object
        ActionBar actionBar;
        actionBar = getSupportActionBar();

        // Define ColorDrawable object and parse color
        // using parseColor method
        // with color hash code as its parameter
        ColorDrawable colorDrawable
                = new ColorDrawable(Color.parseColor("#0F9D58"));

        // Set BackgroundDrawable
        actionBar.setBackgroundDrawable(colorDrawable);

    You can change the "#0F9D58" to any color code you want.

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  2. 0

    there is another way to add a default toolbar to your app while setting your parent theme same as:

    parent="Theme.Material3.DayNight.NoActionBar"

    activity_main.xml

    by following this approach you don’t need to change background color from the java code but you can easily change background color as a simple attribute of toolbar.

    <?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <com.google.android.material.appbar.MaterialToolbar
        android:id="@+id/myToolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#1F6C23"
        android:elevation="4dp"
        android:minHeight="?attr/actionBarSize"
        android:theme="?attr/actionBarTheme"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

    MainActivity.class

    import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Toolbar myToolbar = (Toolbar) findViewById(R.id.myToolbar);
        setSupportActionBar(myToolbar);
    }
}

    see the official documentation here :
    https://developer.android.com/develop/ui/views/components/appbar/setting-up

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