ARCoreでText表示

#表示するテキストの作成
背景を白で、テキストの色を濃い青に設定
TextView tv = new TextView(this);
tv.setTextColor(Color.rgb(0x0,0x0,0xaa));
tv.setBackgroundColor(Color.rgb(0xff,0xff,0xff));
tv.setText("練習だよ");

```MainActivity.java
public class MainActivity extends AppCompatActivity {
    private static final int CAMERA_PERMISSION_CODE = 0;
    private static final String CAMERA_PERMISSION = Manifest.permission.CAMERA;
    private ViewRenderable textViewRenderable;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ArCoreApk.Availability availability =
                ArCoreApk.getInstance().checkAvailability(this);
        if (availability.isSupported()) {
            Toast.makeText(this, "AR機能が利用できます", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(this, "AR機能を利用することができません", Toast.LENGTH_SHORT).show();
            finish();
            return;
        }

        setContentView(R.layout.activity_main);

        TextView tv = new TextView(this);
        tv.setTextColor(Color.rgb(0x0,0x0,0xaa));
        tv.setBackgroundColor(Color.rgb(0xff,0xff,0xff));
        tv.setText("練習だよ");

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

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            ViewRenderable.builder()
                    .setView(this, tv)
                    .build()
                    .thenAccept(renderable -> textViewRenderable = renderable);
        }

        if(arFragment != null ) {

            arFragment.setOnTapArPlaneListener(
                    (HitResult hitResult, Plane plane, MotionEvent motionEvent) -> {

                        Anchor anchor = hitResult.createAnchor();
                        AnchorNode anchorNode = new AnchorNode(anchor);
                        anchorNode.setParent(arFragment.getArSceneView().getScene());
                        TransformableNode text = new TransformableNode(arFragment.getTransformationSystem());
                        text.setParent(anchorNode);
                        text.setRenderable(textViewRenderable);
                     
                    });
        }
    }


    @Override
    protected void onResume() {
        super.onResume();
        if (ContextCompat.checkSelfPermission(this, CAMERA_PERMISSION) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[] {CAMERA_PERMISSION}, CAMERA_PERMISSION_CODE);
        }
    }
}
```

```activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".MainActivity">
<androidx.fragment.app.FragmentContainerView
        android:id="@+id/arfragment"
        android:name="com.google.ar.sceneform.ux.ArFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</androidx.constraintlayout.widget.ConstraintLayout>
```
```app.gradle
apply plugin: 'com.android.application'
apply plugin: 'com.google.ar.sceneform.plugin'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "jp.shsit.arcore3"
        minSdkVersion 24
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    //ARCore関係
    implementation "com.gorisse.thomas.sceneform:sceneform:1.21.0"
}
```
これがないと、エラーが出ます
```compileOptions {
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }
```

```build.gradle
buildscript {
    repositories {
        google()
        jcenter()
        
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.3'
        classpath 'com.google.ar.sceneform:plugin:1.15.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

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

task clean(type: Delete) {
    delete rootProject.buildDir
}
```
```AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="jp.shsit.arcore3">

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.ar" android:required="true"/>



    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <meta-data android:name="com.google.ar.core" android:value="requireed"/>
        <activity android:name=".TextActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".MainActivity" />
        <activity android:name=".ViewActivity" />



    </application>

</manifest>
```
AR機能を必須(requireed)とするか？選択(Optional)とするか？を記述します。今回は、必須としました。
 meta-data android:name="com.google.ar.core" android:value="requireed"


実行結果
![text.jpg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/560948/32af1d23-4233-f9c3-8c72-c5a7bee44f10.jpeg)