Navigation bar is not visible in my app Android (Eclipse)

Question

When I create an Android app in Eclipse, navigation bar is not displayed in activity_main :

Does anyone know how to fix?

Answer 1

You have to be sure that your android:theme in the Android manifest is like this:

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
</style>

And since Android 5 actionBar is not used, is recommended to use Toolbar. Your Activity has to extend AppCompatActivity

import android.support.v7.app.AppCompatActivity;
//...

public class MainActivity extends AppCompatActivity {
    //...
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Toolbar toolbar = (Toolbar) findViewById(R.id.appbar);
        setSupportActionBar(toolbar);
    }
}

You can custom the toolbar:

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <android.support.v7.widget.Toolbar
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/appbar"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:minHeight="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        android:elevation="4dp"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light" >

    </android.support.v7.widget.Toolbar>


</LinearLayout>