复杂UI卡顿问题没想到还能这么优化？

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/btn"
        android:layout_width="100dp"
        android:layout_height="50dp"
        android:gravity="center"
        android:text="Hello World!" />

    <ViewStub
        android:id="@+id/viewStub"
        android:layout="@layout/realview"
        android:layout_width="match_parent"
        android:layout_height="200dp" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <View
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:background="#fcc" />
</RelativeLayout>

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addViewInNormalWay();
            }
        });
    }

    public void addViewInNormalWay(){
        ViewStub viewStub = findViewById(R.id.viewStub);
        viewStub.inflate();
    }
}

Schedulers.io().scheduleDirect(new Runnable() {
                    @Override
                    public void run() {
                        addViewInNormalWay();
                    }
                });

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                addView();
            }
        });
    }

    private void addView() {
        Disposable d = Single
                .create(new SingleOnSubscribe<View>() {
                    @Override
                    public void subscribe(SingleEmitter<View> emitter) throws Exception {
                        View view = getLayoutInflater().inflate(R.layout.realview, null);
                        emitter.onSuccess(view);//只做inflated 解析xml的操作
                    }
                })
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Consumer<View>() {
                    @Override
                    public void accept(View view) throws Exception {
                        View stub = findViewById(R.id.viewStub);
                        if (stub == null) return;
                        ViewGroup parent = (ViewGroup) stub.getParent();
                        int index = parent.indexOfChild(stub);//找到原始占位view
                        ViewGroup.LayoutParams vlp = stub.getLayoutParams();//拿到lp
                        view.setLayoutParams(vlp);//把lp给到新view
                        parent.removeViewAt(index);//从树里删除
                        parent.addView(view, index);//替换上去
                    }
                });

    }
}