Cannot Instantiate CameraView in content_main.xml

[ahmedshah1494]

I am getting the following error trace when I try to place the CameraView in the content_main.xml file. My gradle settings are configured for APK 9-24. I am currently able to take images using the camera2 API but I wanted to switch to CameraView to avoid writing code for the old API as well.

<com.google.android.cameraview.CameraView android:id="@+id/camera" android:layout_width="10px" android:layout_height="10px" android:adjustViewBounds="true" app:autoFocus="true" app:aspectRatio="4:3" app:facing="back"/>

java.lang.UnsupportedOperationException: Unsupported Service: camera at com.android.layoutlib.bridge.android.BridgeContext.getSystemService(BridgeContext.java:602) at com.google.android.cameraview.Camera2.<init>(Camera2.java:191) at com.google.android.cameraview.CameraView.<init>(CameraView.java:102) at com.google.android.cameraview.CameraView.<init>(CameraView.java:85) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at org.jetbrains.android.uipreview.ViewLoader.createNewInstance(ViewLoader.java:465) at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:172) at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:105) at com.android.tools.idea.rendering.LayoutlibCallbackImpl.loadView(LayoutlibCallbackImpl.java:186) at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:334) at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:345) at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:245) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727) at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:858) at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70) at android.view.LayoutInflater.rInflate(LayoutInflater.java:834) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821) at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:861) at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70) at android.view.LayoutInflater.rInflate(LayoutInflater.java:834) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821) at android.view.LayoutInflater_Delegate.parseInclude(LayoutInflater_Delegate.java:197) at android.view.LayoutInflater.parseInclude(LayoutInflater.java:902) at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:854) at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70) at android.view.LayoutInflater.rInflate(LayoutInflater.java:834) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821) at android.view.LayoutInflater.inflate(LayoutInflater.java:518) at android.view.LayoutInflater.inflate(LayoutInflater.java:397) at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:324) at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:429) at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:389) at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:548) at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:533) at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:966) at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:533) at com.android.tools.idea.rendering.RenderTask.lambda$inflate$72(RenderTask.java:659) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)

private View.OnClickListener mOnClickListener = new View.OnClickListener() { @Override public void onClick(View v) { if (mCameraView != null) { mCameraView.takePicture(); } } };

protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); mCameraView = (CameraView) findViewById(R.id.camera); ... shootB.setOnClickListener(mOnClickListener);
`private CameraView.Callback mCallback
= new CameraView.Callback() {

    @Override
    public void onCameraOpened(CameraView cameraView) {
        Log.d("", "onCameraOpened");
    }

    @Override
    public void onCameraClosed(CameraView cameraView) {
        Log.d("", "onCameraClosed");
    }

    @Override
    public void onPictureTaken(CameraView cameraView, final byte[] data) {
        Log.d("", "onPictureTaken " + data.length);
        handler.post(new Runnable() {
            @Override
            public void run() {
                // This demo app saves the taken picture to a constant file.
                // $ adb pull /sdcard/Android/data/com.google.android.cameraview.demo/files/Pictures/picture.jpg
                File file = new File(Environment.getExternalStorageDirectory()+"/"+DATA_COLLECTOR_FOLDER+"/"+mChosenFile+"/picture.jpg");
                OutputStream os = null;
                try {
                    os = new FileOutputStream(file);
                    os.write(data);
                    os.close();
                } catch (IOException e) {
                    Log.w("", "Cannot write to " + file, e);
                } finally {
                    if (os != null) {
                        try {
                            os.close();
                        } catch (IOException e) {
                            // Ignore
                        }
                    }
                }
            }
        });
    }

};`

This is the error log that I get when I try to take a photo
10-14 20:15:19.315 26409-26409/com.thesis.ahmed.datacollector E/AndroidRuntime: FATAL EXCEPTION: main Process: com.thesis.ahmed.datacollector, PID: 26409 java.lang.NullPointerException: Attempt to invoke virtual method 'void android.hardware.camera2.CaptureRequest$Builder.set(android.hardware.camera2.CaptureRequest$Key, java.lang.Object)' on a null object reference at com.google.android.cameraview.Camera2.lockFocus(Camera2.java:547) at com.google.android.cameraview.Camera2.takePicture(Camera2.java:323) at com.google.android.cameraview.CameraView.takePicture(CameraView.java:376) at com.thesis.ahmed.datacollector.MainActivity$1.onClick(MainActivity.java:79) at android.view.View.performClick(View.java:4856) at android.view.View$PerformClick.run(View.java:19956) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:211) at android.app.ActivityThread.main(ActivityThread.java:5389) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)

[yaraki]

Needs more info.

[ahmedshah1494]

I am not sure what more information I could provide since I get this error in the layout preview as soon as I place the aforementioned xml in my content_main.xml file.

I am adding my code that uses CameraView, maybe that might help.

[yaraki]

What is your device? What is the API level of that device?

[andreidiaconu]

This error appears in Preview in Android Studio (not an an actual device). Perhaps we could use View.isInEditMode() as Android Studio suggests?

Tip: Use View.isInEditMode() in your custom views to skip code or show sample data when shown in the IDE.