Android使用setContentView实现页面的转换效果

public class ExampleActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_page_layout);
    
    Button button = findViewById(R.id.buttonGoToLayout2);
    button.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        // 跳转到第二个页面
        jumpToLayout2();
      }
    });
  }

  private void jumpToLayout2() {
    // 设置第二个页面的布局
    setContentView(R.layout.layout2);
    Button button2 = findViewById(R.id.buttonGoToLayout1);
    button2.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        // 在第二个页面中，点击Button，跳转到第一个页面
        jumpToLayout1();
      }
    });
  }

  private void jumpToLayout1() {
    // 设置第一个页面d的布局
    setContentView(R.layout.main_page_layout);
    Button button = findViewById(R.id.buttonGoToLayout2);
    button.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        // 点击第一个页面的Button，跳转到第二个页面
        jumpToLayout2();
      }
    });
  }
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center">
    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="This is Layout One"
        android:paddingTop="20dp"
        android:textSize="30sp"/>
    <Button
        android:text="Go to Layout Two"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/buttonGoToLayout2"
        android:layout_marginTop="20dp"
        android:layout_below="@id/textView1"/>
</RelativeLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:background="@android:color/black" >
  <TextView
      android:id="@+id/textView2"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:text="This is Layout Two"
      android:paddingTop="20dp"
      android:textColor="@android:color/white"
      android:textSize="30sp"/>
  <Button
      android:text="Go to Layout One"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/buttonGoToLayout1"
      android:layout_marginTop="20dp"
      android:layout_below="@id/textView2"/>
</RelativeLayout>