Show-Hide content on Cardview

activity_main.xml

<?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:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin">

    <android.support.v7.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:padding="10dp">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Click Load More!"
                android:textSize="17sp"
                android:textStyle="bold" />

            <Button
                android:id="@+id/btn_load_more"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Show"/>

            <TextView
                android:id="@+id/txt_more"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Hai!"
                android:textSize="17sp"
                android:textStyle="bold"
                android:visibility="gone"
                android:layout_marginStart="10dp"/>

        </LinearLayout>

    </android.support.v7.widget.CardView>
</LinearLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity {
    @BindView(R.id.btn_load_more)
    Button btnLoadMore;

    @BindView(R.id.txt_more)
    TextView txtMore;
  
    boolean showContent = true;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
    }
  
    @OnClick(R.id.btn_load_more)
    public void onLoadMore() {
        if (showContent) {
            txtMore.setVisibility(View.VISIBLE);
            btnLoadMore.setText("Hide");
            showContent = false;
        } else {
            txtMore.setVisibility(View.GONE);
            btnLoadMore.setText("Show");
            showContent = true;
        }
    }
}