Android 活性释放片段

我有一个定制的相机在碎片中运行。 当调用OnPictureTaken函数时，活动释放片段，因此getActivity返回NULL和“片段未附加到活动”

当照片成功拍摄时。 onPictureTaken被称为。 在那里，我想开始一项活动

@Override
    public void onAttach(Context context) {
        super.onAttach(context);
        mOrientationListener = new CameraOrientationListener(context);
    }


    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        mOrientationListener = new CameraOrientationListener(activity);
        activity2 = activity;
    }


    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Restore your state here because a double rotation with this fragment
        // in the backstack will cause improper state restoration
        // onCreate() -> onSavedInstanceState() instead of going through onCreateView()
        if (savedInstanceState == null) {
            mCameraID = getBackCameraID();
            mFlashMode = CameraSettingPreferences.getCameraFlashMode(getActivity());
            mImageParameters = new ImageParameters();

        } else {
            mCameraID = savedInstanceState.getInt(CAMERA_ID_KEY);
            mFlashMode = savedInstanceState.getString(CAMERA_FLASH_KEY);
            mImageParameters = savedInstanceState.getParcelable(IMAGE_INFO);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.squarecamera__fragment_camera_demo, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        mOrientationListener.enable();

        mPreviewView = (SquareCameraPreview) view.findViewById(R.id.camera_preview_view);
        mPreviewView.getHolder().addCallback(CameraFragment.this);

        final View topCoverView = view.findViewById(R.id.cover_top_view);
        final View btnCoverView = view.findViewById(R.id.cover_bottom_view);

        mImageParameters.mIsPortrait =
                getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT;

        if (savedInstanceState == null) {
            ViewTreeObserver observer = mPreviewView.getViewTreeObserver();
            observer.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                @Override
                public void onGlobalLayout() {
                    mImageParameters.mPreviewWidth = mPreviewView.getWidth();
                    mImageParameters.mPreviewHeight = mPreviewView.getHeight();

                    mImageParameters.mCoverWidth = mImageParameters.mCoverHeight
                            = mImageParameters.calculateCoverWidthHeight();

//                    Log.d(TAG, "parameters: " + mImageParameters.getStringValues());
//                    Log.d(TAG, "cover height " + topCoverView.getHeight());
                    resizeTopAndBtmCover(topCoverView, btnCoverView);

                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                        mPreviewView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                    } else {
                        mPreviewView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                    }
                }
            });
        } else {
            if (mImageParameters.isPortrait()) {
                topCoverView.getLayoutParams().height = mImageParameters.mCoverHeight;
                btnCoverView.getLayoutParams().height = mImageParameters.mCoverHeight;
            } else {
                topCoverView.getLayoutParams().width = mImageParameters.mCoverWidth;
                btnCoverView.getLayoutParams().width = mImageParameters.mCoverWidth;
            }
        }

        final ImageView swapCameraBtn = (ImageView) view.findViewById(R.id.change_camera);
        swapCameraBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mCameraID == CameraInfo.CAMERA_FACING_FRONT) {
                    mCameraID = getBackCameraID();
                } else {
                    mCameraID = getFrontCameraID();
                }
                restartPreview();
            }
        });

        final View changeCameraFlashModeBtn = view.findViewById(R.id.flash);
        changeCameraFlashModeBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mFlashMode.equalsIgnoreCase(Camera.Parameters.FLASH_MODE_AUTO)) {
                    mFlashMode = Camera.Parameters.FLASH_MODE_ON;
                } else if (mFlashMode.equalsIgnoreCase(Camera.Parameters.FLASH_MODE_ON)) {
                    mFlashMode = Camera.Parameters.FLASH_MODE_OFF;
                } else if (mFlashMode.equalsIgnoreCase(Camera.Parameters.FLASH_MODE_OFF)) {
                    mFlashMode = Camera.Parameters.FLASH_MODE_AUTO;
                }

                setupFlashMode();
                setupCamera();
            }
        });

        final ImageView takePhotoBtn = (ImageView) view.findViewById(R.id.capture_image_button);
        takePhotoBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                takePicture();
            }
        });
    }
@Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode != Activity.RESULT_OK) return;

        switch (requestCode) {
            case 1:
                Uri imageUri = data.getData();
                break;

            default:
                super.onActivityResult(requestCode, resultCode, data);
        }
    }


    //This is the Function Where it lands after the Picture is taken
    /**
     * A picture has been taken
     * @param data
     * @param camera
     */
    @Override
    public void onPictureTaken(byte[] data, Camera camera) {
          rotation = getPhotoRotation();
        DisplayPicFragment.newInstance(data, rotation,mImageParameters.createCopy());
        startActivity(new Intent(getActivity(), DisplayPicActivity.class));
//        if(isAdded()){
//            startActivity(new Intent(activity2, DisplayPicActivity.class));
//        }

        setSafeToTakePhoto(true);
    }

---

从您的

DisplayPicActivity

中，我了解到您想要显示图片

---

有一种方法-。

你在谈论我们没有的代码。。。请提供一些代码，以便我们能够理解您的片段的结构以及您所引用的回调的生命周期。请查收，好的，贾马尔。谢谢你，我会处理的。