i want to import 3D in live image i have null pointer exception

package com.example.umair.dragfinal;

import android.net.Uri; import android.support.v7.app.AlertDialog; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.ImageView; import android.widget.LinearLayout;

import com.google.ar.core.Anchor; import com.google.ar.core.Frame; import com.google.ar.core.HitResult; import com.google.ar.core.Plane; import com.google.ar.core.Trackable; import com.google.ar.core.TrackingState; import com.google.ar.sceneform.AnchorNode; import com.google.ar.sceneform.rendering.ModelRenderable; import com.google.ar.sceneform.rendering.Renderable; import com.google.ar.sceneform.ux.ArFragment; import com.google.ar.sceneform.ux.TransformableNode;

import java.util.List; import java.util.concurrent.CompletableFuture;

public class MainActivity extends AppCompatActivity { private ArFragment fragment; private PointerDrawable pointer = new PointerDrawable(); private boolean isTracking; private boolean isHitting;

@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); fragment = (ArFragment) getSupportFragmentManager().findFragmentById(R.id.sceneform_fragment);

fragment.getArSceneView().getScene().addOnUpdateListener(frameTime -> {
    fragment.onUpdate(frameTime);
    onUpdate();
});
initializeGallery();

}

private void onUpdate() { boolean trackingChanged = updateTracking(); View contentView = findViewById(android.R.id.content); if (trackingChanged) { if (isTracking) { contentView.getOverlay().add(pointer); } else { contentView.getOverlay().remove(pointer); } contentView.invalidate(); }

if (isTracking) {
    boolean hitTestChanged = updateHitTest();
    if (hitTestChanged) {
        pointer.setEnabled(isHitting);
        contentView.invalidate();
    }
}

} private boolean updateTracking() { Frame frame = fragment.getArSceneView().getArFrame(); boolean wasTracking = isTracking; isTracking = frame != null && frame.getCamera().getTrackingState() == TrackingState.TRACKING; return isTracking != wasTracking; } private boolean updateHitTest() { Frame frame = fragment.getArSceneView().getArFrame(); android.graphics.Point pt = getScreenCenter(); List hits; boolean wasHitting = isHitting; isHitting = false; if (frame != null) { hits = frame.hitTest(pt.x, pt.y); for (HitResult hit : hits) { Trackable trackable = hit.getTrackable(); if (trackable instanceof Plane && ((Plane) trackable).isPoseInPolygon(hit.getHitPose())) { isHitting = true; break; } } } return wasHitting != isHitting; }

private android.graphics.Point getScreenCenter() { View vw = findViewById(android.R.id.content); return new android.graphics.Point(vw.getWidth()/2, vw.getHeight()/2); } private void initializeGallery() { LinearLayout gallery = findViewById(R.id.gallery_layout);

ImageView andy = new ImageView(this);
andy.setImageResource(R.drawable.droid_thumb);
andy.setContentDescription("andy");
andy.setOnClickListener(view ->{addObject(Uri.parse("andy.sfb"));});
gallery.addView(andy);

ImageView cabin = new ImageView(this);
cabin.setImageResource(R.drawable.cabin_thumb);
cabin.setContentDescription("cabin");
cabin.setOnClickListener(view ->{addObject(Uri.parse("Cabin.sfb"));});
gallery.addView(cabin);

ImageView house = new ImageView(this);
house.setImageResource(R.drawable.house_thumb);
house.setContentDescription("house");
house.setOnClickListener(view ->{addObject(Uri.parse("House.sfb"));});
gallery.addView(house);

ImageView igloo = new ImageView(this);
igloo.setImageResource(R.drawable.igloo_thumb);
igloo.setContentDescription("igloo");
igloo.setOnClickListener(view ->{addObject(Uri.parse("igloo.sfb"));});
gallery.addView(igloo);

} //Add the addObject method private void addObject(Uri model) { Frame frame = fragment.getArSceneView().getArFrame(); android.graphics.Point pt = getScreenCenter(); List hits; if (frame != null) { hits = frame.hitTest(pt.x, pt.y); for (HitResult hit : hits) { Trackable trackable = hit.getTrackable(); if (trackable instanceof Plane && ((Plane) trackable).isPoseInPolygon(hit.getHitPose())) { placeObject(fragment, hit.createAnchor(), model); break;

        }
    }
}

} //Add placeObject method private void placeObject(ArFragment fragment, Anchor anchor, Uri model) { CompletableFuture renderableFuture = ModelRenderable.builder() .setSource(fragment.getContext(), model) .build() .thenAccept(renderable -> addNodeToScene(fragment, anchor, renderable)) .exceptionally((throwable -> { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage(throwable.getMessage()) .setTitle("Codelab error!"); AlertDialog dialog = builder.create(); dialog.show(); return null; })); } //add obj private void addNodeToScene(ArFragment fragment, Anchor anchor, Renderable renderable) { AnchorNode anchorNode = new AnchorNode(anchor); TransformableNode node = new TransformableNode(fragment.getTransformationSystem()); node.setRenderable(renderable); node.setParent(anchorNode); fragment.getArSceneView().getScene().addChild(anchorNode); node.select(); } } null pointer execption are Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.ar.sceneform.ArSceneView com.google.ar.sceneform.ux.ArFragment.getArSceneView()' on a null object reference at com.example.umair.dragfinal.MainActivity.onCreate(MainActivity.java:39)

google-ar / sceneform-android-sdk

i want to import 3D in live image i have null pointer exception #351