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Hi guys my app runs in portrait mode but when i try landscape mode the app stops running.I am making face tracking and applying masks on face.

This app is running properly on portrait mode but stops working as soon as i switched to landscape mode can anybody please help me

here is source code

import android.content.Context;
import android.content.res.Configuration;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.ViewGroup;

 import com.google.android.gms.common.images.Size;
 import com.google.android.gms.vision.CameraSource;

 import java.io.IOException;

  public class CameraSourcePreview extends ViewGroup {

  private static final String TAG = "CameraSourcePreview";

private Context mContext;
private SurfaceView mSurfaceView;
private boolean mStartRequested;
private boolean mSurfaceAvailable;
private CameraSource mCameraSource;

private GraphicOverlay mOverlay;

public CameraSourcePreview(Context context, AttributeSet attrs) {
    super(context, attrs);
    mContext = context;
    mStartRequested = false;
    mSurfaceAvailable = false;

    mSurfaceView = new SurfaceView(context);
    mSurfaceView.getHolder().addCallback(new SurfaceCallback());
    addView(mSurfaceView);
 }

 public void start(CameraSource cameraSource) throws IOException {
    if (cameraSource == null) {
        stop();
    }

    mCameraSource = cameraSource;

    if (mCameraSource != null) {
        mStartRequested = true;
        startIfReady();
    }
 }

  public void start(CameraSource cameraSource, GraphicOverlay overlay)                throws IOException {
    mOverlay = overlay;
    start(cameraSource);
}

public void stop() {
    if (mCameraSource != null) {
        mCameraSource.stop();
    }
}

public void release() {
    if (mCameraSource != null) {
        mCameraSource.release();
        mCameraSource = null;
    }
}

private void startIfReady() throws IOException {
    if (mStartRequested && mSurfaceAvailable) {
        mCameraSource.start(mSurfaceView.getHolder());
        if (mOverlay != null) {
            Size size = mCameraSource.getPreviewSize();
            int min = Math.min(size.getWidth(), size.getHeight());
            int max = Math.max(size.getWidth(), size.getHeight());
            if (isPortraitMode()) {
                // Swap width and height sizes when in portrait, since it will be rotated by
                // 90 degrees
                mOverlay.setCameraInfo(min, max, mCameraSource.getCameraFacing());
            } else {
                mOverlay.setCameraInfo(max, min, mCameraSource.getCameraFacing());
            }
            mOverlay.clear();
        }
        mStartRequested = false;
    }
}

private class SurfaceCallback implements SurfaceHolder.Callback {
    @Override
    public void surfaceCreated(SurfaceHolder surface) {
        mSurfaceAvailable = true;
        try {
            startIfReady();
        } catch (IOException e) {
            Log.e(TAG, "Could not start camera source.", e);
        }
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder surface) {
        mSurfaceAvailable = false;
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    }

}

@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
    int previewWidth = 320;
    int previewHeight = 240;
    if (mCameraSource != null) {
        Size size = mCameraSource.getPreviewSize();
        if (size != null) {
            previewWidth = size.getWidth();
            previewHeight = size.getHeight();
        }
    }

    // Swap width and height sizes when in portrait, since it will be rotated 90 degrees
    if (isPortraitMode()) {
        int tmp = previewWidth;
        previewWidth = previewHeight;
        previewHeight = tmp;
    }

    final int viewWidth = right - left;
    final int viewHeight = bottom - top;

    int childWidth;
    int childHeight;
    int childXOffset = 0;
    int childYOffset = 0;
    float widthRatio = (float) viewWidth / (float) previewWidth;
    float heightRatio = (float) viewHeight / (float) previewHeight;

    // To fill the view with the camera preview, while also preserving the correct aspect ratio,
    // it is usually necessary to slightly oversize the child and to crop off portions along one
    // of the dimensions.  We scale up based on the dimension requiring the most correction, and
    // compute a crop offset for the other dimension.
    if (widthRatio > heightRatio) {
        childWidth = viewWidth;
        childHeight = (int) ((float) previewHeight * widthRatio);
        childYOffset = (childHeight - viewHeight) / 2;
    } else {
        childWidth = (int) ((float) previewWidth * heightRatio);
        childHeight = viewHeight;
        childXOffset = (childWidth - viewWidth) / 2;
    }

    for (int i = 0; i < getChildCount(); ++i) {
        // One dimension will be cropped.  We shift child over or up by this offset and adjust
        // the size to maintain the proper aspect ratio.
        getChildAt(i).layout(
                -1 * childXOffset, -1 * childYOffset,
                childWidth - childXOffset, childHeight - childYOffset);
    }

    try {
        startIfReady();
    } catch (IOException e) {
        Log.e(TAG, "Could not start camera source.", e);
    }
}

private boolean isPortraitMode() {
    int orientation = mContext.getResources().getConfiguration().orientation;
    if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
        return false;
    }
    if (orientation == Configuration.ORIENTATION_PORTRAIT) {
        return true;
    }

    Log.d(TAG, "isPortraitMode returning false by default");
    return false;
}

}

here is the error i am getting 

  05-02 08:59:20.983 2307-2307/com.miscreality.stickar E/AndroidRuntime:                            FATAL EXCEPTION: main
  Process: com.miscreality.stickar, PID: 2307
  java.lang.RuntimeException: Unable to start activity                                            ComponentInfo{com.miscreality.stickar/com.miscreality.stickar.Camera.FaceActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2706)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2767)
    at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4592)
    at android.app.ActivityThread.-wrap19(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1522)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:163)
    at android.app.ActivityThread.main(ActivityThread.java:6221)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794)
 Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
    at com.miscreality.stickar.Camera.FaceActivity.onCreate(FaceActivity.java:65)
    at android.app.Activity.performCreate(Activity.java:6864)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2659)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2767) 
    at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4592) 
    at android.app.ActivityThread.-wrap19(ActivityThread.java) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1522) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:163) 
    at android.app.ActivityThread.main(ActivityThread.java:6221) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:794) 

05-02 08:59:21.007 2307-2307/com.miscreality.stickar I/Process: Sending signal. PID: 2307 SIG: 9

Janvi Vyas
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Shubham Gupta
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  • you are getting a NullPointerException because you have not initialized the view before adding OnClickListener to it. – Dinesh Neupane May 02 '18 at 03:45
  • I am also getting error on method startIfready method in line 3 mCameraSource. The error is call require permission which maybe rejected by user should explicity check to see if permission is available or explicity handle a potential SecurityException – Shubham Gupta May 02 '18 at 03:48
  • handle the orienation change case also on orienationchange – Quick learner May 02 '18 at 04:44
  • @ShubhamGupta https://stackoverflow.com/questions/33327984/call-requires-permissions-that-may-be-rejected-by-user?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa – IntelliJ Amiya May 02 '18 at 05:46

1 Answers1

0
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.miscreality.stickar.Camera.FaceActivity.onCreate(FaceActivity.java:65)

This line of the error message is giving you the hint: on the onCreate() method of your FaceActivity class you are setting the OnClickListener to a view that hasn't been initialized yet.

You probably forgot to bind the view to the variable.

Keep in mind that when you change the orientation, the activity is recreated.

Ana Varani
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