如何在android studio中实现半窗口

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">

    <LinearLayout
        android:id="@+id/mainContent"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:background="#ffffff"
        android:gravity="center"
        android:orientation="vertical">

        <!-- 主要内容视图 -->

    </LinearLayout>

    <LinearLayout
        android:id="@+id/halfWindowContent"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:background="#f0f0f0"
        android:gravity="center"
        android:orientation="vertical"
        android:visibility="gone">

        <!-- 半窗口内容视图 -->

    </LinearLayout>

</LinearLayout>

public class MainActivity extends AppCompatActivity {

    private LinearLayout mainContent;
    private LinearLayout halfWindowContent;

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

        mainContent = findViewById(R.id.mainContent);
        halfWindowContent = findViewById(R.id.halfWindowContent);

        // 设置需要显示半窗口内容的按钮点击事件
        Button showHalfWindowButton = findViewById(R.id.showHalfWindowButton);
        showHalfWindowButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showHalfWindowContent();
            }
        });
    }

    private void showHalfWindowContent() {
        halfWindowContent.setVisibility(View.VISIBLE);
    }
}