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<?xml version="1.0" encoding="utf-8"?>
<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"
    android:layout_gravity="center"
    android:gravity="center">

        <ListView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/listLevels"
            android:layout_gravity="center_horizontal"
            tools:listitem="@layout/item_level"
            android:dividerHeight="20dp"
            android:layout_marginLeft="20dp"
            android:layout_marginRight="20dp"
            android:paddingTop="0dp"
            android:divider="@null"
            android:dividerHeight="0dp"/>


</LinearLayout>

        ListView listLevels = (ListView)findViewById(R.id.listLevels);
        listLevels.setOnItemClickListener(this);
        LevelsAdapter levelsAdapter=new LevelsAdapter();
        listLevels.setAdapter(levelsAdapter);