一. 配置您项目的 build.gradle 文件,相关AR项目引用

官网地址
官网demo地址

1.确保您项目的 build.gradle 包括 Google 的 Maven 代码库：

allprojects {
    repositories {
        google()
        jcenter()
    }
}

2.更新您应用的 build.gradle 以添加最新的 ARCore 和 Sceneform 用户体验依赖项，确保您的项目设置与两个库都兼容。

android {
    …
    defaultConfig {
        // Sceneform requires minSdkVersion >= 24.
        minSdkVersion 24
        …
    }
    // Sceneform libraries use language constructs from Java 8.
    // Add these compile options if targeting minSdkVersion < 26.
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    …
    // Provides ARCore Session and related resources.
    implementation 'com.google.ar:core:1.5.0'

    // Provides ArFragment, and other UX resources.
    implementation 'com.google.ar.sceneform.ux:sceneform-ux:1.5.0'

    // Alternatively, use ArSceneView without the UX dependency.
    implementation 'com.google.ar.sceneform:core:1.5.0'
}

3.更新您的 AndroidManifest.xml

修改您的 AndroidManifest.xml 来指示您的应用使用（AR 可选）或需要（AR 必备）ARCore 和摄像头访问权限：

<!-- Both "AR Optional" and "AR Required" apps require CAMERA permission. -->
<uses-permission android:name="android.permission.CAMERA" />

<!-- Indicates that app requires ARCore ("AR Required"). Ensures app is only
     visible in the Google Play Store on devices that support ARCore.
     For "AR Optional" apps remove this line. -->
<uses-feature android:name="android.hardware.camera.ar" />

<application>
    …
    <!-- Indicates that app requires ARCore ("AR Required"). Causes Google
         Play Store to download and install ARCore along with the app.
         For an "AR Optional" app, specify "optional" instead of "required".
    -->
    <meta-data android:name="com.google.ar.core" android:value="required" />
</application>

二. Android Studio中预览3D模型文件 官网说明

1.安装 Google Sceneform Tools (Beta) 插件

在 Android Studio 中，打开 Plugins 设置：

Windows：File > Settings > Plugins > Browse Repositories
macOS：Android Studio > Preferences > Plugins
然后点击 Browse repositories 并安装 Google Sceneform Tools (Beta)。

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2.导入3D asset, 添加Sampledata文件(已经有,可以不再新建)

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3.copy模型文件到sampledata中,如果没有模型文件, 可下载官网demo官网demo地址

4.选择.obj文件导入模型在Android studio中查看

image.png
image.png

更新您的应用的 build.gradle 文件，为新导入的 asset 添加一个 apply plugin 行和一个 sceneform.asset() 条目：

apply plugin: 'com.google.ar.sceneform.plugin'
//导入成功后,下面代码会自动生成
sceneform.asset('sampledata/models/andy.obj', // 'Source Asset Path' specified during import.
        'default',                            // 'Material Path' specified during import.
        'sampledata/models/andy.sfa',         // '.sfa Output Path' specified during import.
        'src/main/res/raw/andy')              // '.sfb Output Path' specified during import.

4.检查是否支持ARCore,并且检查权限

//检查是否支持ARCore
 /**
   * Returns false and displays an error message if Sceneform can not run, true if Sceneform can run
   * on this device.
   *
   * <p>Sceneform requires Android N on the device as well as OpenGL 3.0 capabilities.
   *
   * <p>Finishes the activity if Sceneform can not run
   */
  public static boolean checkIsSupportedDeviceOrFinish(final Activity activity) {
    if (Build.VERSION.SDK_INT < VERSION_CODES.N) {
      Log.e(TAG, "this APP requires Android N or later");
      Toast.makeText(activity, "this APP Android N or later", Toast.LENGTH_LONG).show();
      activity.finish();
      return false;
    }
    String openGlVersionString =
        ((ActivityManager) activity.getSystemService(Context.ACTIVITY_SERVICE))
            .getDeviceConfigurationInfo()
            .getGlEsVersion();
    if (Double.parseDouble(openGlVersionString) < MIN_OPENGL_VERSION) {
      Log.e(TAG, "Sceneform requires OpenGL ES 3.0 later");
      Toast.makeText(activity, "Sceneform requires OpenGL ES 3.0 or later", Toast.LENGTH_LONG)
          .show();
      activity.finish();
      return false;
    }
    return true;
  }

//检查申请权限
 public static final int PERMISSION_REQUESTCODE = 0;
    public static void checkPermissions(final Activity activity) {
        List<String> needRequestPermissionList = findDeniedPermissions(activity,needPermissions);
        if (needRequestPermissionList != null
                && needRequestPermissionList.size() > 0) {
            String[] array = needRequestPermissionList.toArray(new String[needRequestPermissionList.size()]);
            activity.requestPermissions(array, PERMISSION_REQUESTCODE);
        }
    }

    public static List<String> findDeniedPermissions(final Activity activity,String[] permissions) {
        List<String> needRequestPermissionList = new ArrayList<String>();
        try {
            for (String perm : permissions) {
                Method checkSelfMethod = activity.getClass().getMethod("checkSelfPermission", String.class);
                Method shouldShowRequestPermissionRationaleMethod = activity.getClass().getMethod("shouldShowRequestPermissionRationale",
                        String.class);
                if ((Integer)checkSelfMethod.invoke(activity, perm) != PackageManager.PERMISSION_GRANTED
                        || (Boolean)shouldShowRequestPermissionRationaleMethod.invoke(activity, perm)) {
                    needRequestPermissionList.add(perm);
                }
            }
        } catch (Throwable e) {

        }
        return needRequestPermissionList;
    }

三. 代码部分

1.xml文件部分

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".activity.PlaneModelActvity">

   <fragment android:name="com.google.ar.sceneform.ux.ArFragment"
       android:id="@+id/ux_fragment"
       android:layout_width="match_parent"
       android:layout_height="match_parent" />

</FrameLayout>

2.java代码部分

private ArFragment fragment;
private ModelRenderable andyRenderable;

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

//初始化模型文件
ModelRenderable.builder()
                .setSource(this, Uri.parse("andy.sfb"))  //加载模型资源
                .build()
                .thenAccept(renderable -> andyRenderable = renderable)
                .exceptionally(
                        throwable -> {
                            Toast toast =
                                    Toast.makeText(this, "Unable to load andy renderable", Toast.LENGTH_LONG);
                            toast.setGravity(Gravity.CENTER, 0, 0);
                            toast.show();
                            return null;
                        });

        fragment.setOnTapArPlaneListener(
                (HitResult hitResult, Plane plane, MotionEvent motionEvent) -> {
                    if (andyRenderable == null) {
                        return;
                    }

                    // Create the Anchor. 创建定位点
                    Anchor anchor = hitResult.createAnchor();
                    AnchorNode anchorNode = new AnchorNode(anchor);
                    anchorNode.setParent(fragment.getArSceneView().getScene());

                    // Create the transformable andy and add it to the anchor.
                    TransformableNode andy = new TransformableNode(fragment.getTransformationSystem());
                    andy.setParent(anchorNode);
                    andy.setRenderable(andyRenderable);
                    andy.select();
                });

常见问题

1. 如果点击 Sample Data Directory并没有新建出sampledata文件夹, 可以手动创建, 并将模型文件Copy进去, 再进行 Import Sceneform Asset 操作。

2.点击obj/fbx文件,发现并没有Import Sceneform Asset 选项
解决方案:
2.1 回到文章上端查看安装 Google Sceneform Tools (Beta) 插件, 不安装肯定是找不到Import Sceneform Asset选项的

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