getSupportFragmentManager() 不可访问

问题描述

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.net.Uri;
import android.view.Gravity;
import android.view.MotionEvent;
import android.widget.ImageButton;
import android.widget.Toast;
import com.google.ar.core.Anchor;
import com.google.ar.core.HitResult;
import com.google.ar.core.Plane;
import com.google.ar.sceneform.AnchorNode;
import com.google.ar.sceneform.rendering.ModelRenderable;
import com.google.ar.sceneform.ux.ArFragment;
import com.google.ar.sceneform.ux.BaseArFragment;
import com.google.ar.sceneform.ux.TransformableNode;
import com.google.ar.sceneform.math.Quaternion;
import com.google.ar.sceneform.math.Vector3;
import android.view.View;

public class MainActivity extends AppCompatActivity {

    private ArFragment arFragment;
    private ModelRenderable modelRenderable;

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

        arFragment = (ArFragment) getSupportFragmentManager().findFragmentById(R.id.fragment);

出现错误:

Inconvertible types; cannot cast 'androidx.fragment.app.Fragment' to 'com.google.ar.sceneform.ux.ArFragment'

我已经为片段添加了导入?

I have add the import for fragment?

1. 在构建过程中也出现这个错误.

1. Also giving this Error during Build.

sceneformsrc\sceneform\src\main\java\com\google\ar\sceneform\AnchorNode.java:3: 错误:包 android.support.annotation 不存在导入 android.support.annotation.Nullable;

sceneformsrc\sceneform\src\main\java\com\google\ar\sceneform\AnchorNode.java:3: error: package android.support.annotation does not existimport android.support.annotation.Nullable;

因为我收到这些错误而遗漏了什么?

am missing something that I am getting these errors?

我使用的是 Sceneform 1.16 和 Andriod studio 4.1

I am using Sceneform 1.16 and Andriod studio 4.1

推荐答案

<fragment
        android:id="@+id/face_fragment"
        android:name="com.google.ar.sceneform.ux.ArFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

你有没有提到 android:name 标签?

Have you mentioned the android:name tag?

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