我的问题是与主机活动，我发现它与一个设置android:launchMode=“标准”，我删除它临时，它工作!

选项1:

如果你从片段调用startActivityForResult()，那么你应该调用startActivityForResult()，而不是getActivity().startActivityForResult()，因为它将导致片段onActivityResult()。

如果你不确定你在哪里调用startActivityForResult()和你将如何调用方法。

选项2:

由于Activity获得onActivityResult()的结果，您将需要覆盖活动的onActivityResult()并调用super.onActivityResult()来传播到未处理的结果代码或所有的各自片段。

如果以上两个选项都不管用，那么请参考选项3，因为它肯定会起作用。

选项3:

从fragment显式调用onActivityResult函数如下所示。

在父Activity类中，重写onActivityResult()方法，甚至在Fragment类中重写同样的方法，并像下面的代码一样调用。

在父类中:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.dualPane);
    fragment.onActivityResult(requestCode, resultCode, data);
}

在儿童班:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // In fragment class callback
}

我在使用ChildFragmentManager时有同样的问题。管理器不会将结果传递给嵌套片段，您必须在基本片段中手动执行此操作。

public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    super.onActivityResult(requestCode, resultCode, intent);
    Fragment fragment = (Fragment) getChildFragmentManager().findFragmentByTag(childTag);
    if (fragment != null) {
        fragment.onActivityResult(requestCode, resultCode, intent);
    }
}

你的代码有一个嵌套的片段。调用超。onActivityForResult不起作用

你不希望修改你的片段可以被调用的每个活动，或者绕过调用片段链中的每个片段。

这是许多可行的解决方案之一。动态地创建一个片段，并使用支持片段管理器将其直接连接到活动。然后从新创建的片段调用startActivityForResult。

private void get_UserEmail() {

    if (view == null) {
        return;
    }
    ((TextView) view.findViewById(R.id.tvApplicationUserName))
            .setText("Searching device for user accounts...");

    final FragmentManager fragManager = getActivity().getSupportFragmentManager();

    Fragment f = new Fragment() {
        @Override
        public void onAttach(Activity activity) {
            super.onAttach(activity);
            startActivityForResult(AccountPicker.newChooseAccountIntent(null, null,
                    new String[]{"com.google"}, false, null, null, null, null), REQUEST_CODE_PICK_ACCOUNT);
        }

        @Override
        public void onActivityResult(int requestCode, int resultCode,
                                     Intent data) {
            if (requestCode == REQUEST_CODE_PICK_ACCOUNT) {
                String mEmail = "";
                if (resultCode == Activity.RESULT_OK) {
                    if (data.hasExtra(AccountManager.KEY_ACCOUNT_NAME)) {
                        mEmail = data
                                .getStringExtra(AccountManager.KEY_ACCOUNT_NAME);
                    }
                }
                if (mActivity != null) {
                    GoPreferences.putString(mActivity, SettingApplication.USER_EMAIL, mEmail);
                }
                doUser();
            }
            super.onActivityResult(requestCode, resultCode, data);
            fragManager.beginTransaction().remove(this).commit();
        }
    };
    FragmentTransaction fragmentTransaction = fragManager
            .beginTransaction();
    fragmentTransaction.add(f, "xx" + REQUEST_CODE_PICK_ACCOUNT);
    fragmentTransaction.commit();
}

Kotlin版本(在你的活动onActivityResult()中)

 override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    //add following lines in your activity
    if(supportFragmentManager?.fragments!=null && supportFragmentManager?.fragments!!.size>0)
     for (i in 0..supportFragmentManager?.fragments!!.size-1) {
         val fragment= supportFragmentManager?.fragments!!.get(i)
         fragment.onActivityResult(requestCode, resultCode, data)
    }
 }

public class takeimage extends Fragment {

    private Uri mImageCaptureUri;
    private static final int PICK_FROM_CAMERA = 1;
    private static final int PICK_FROM_FILE = 2;
    private String mPath;
    private ImageView mImageView;
    Bitmap bitmap = null;
    View view;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.activity_send_image, container, false);
        final String[] items = new String[] { "From Camera", "From SD Card" };
        mImageView = (ImageView)view.findViewById(R.id.iv_pic);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.select_dialog_item, items);
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle("Select Image");

        builder.setAdapter(adapter, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int item) {
                if (item == 0) {
                    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    File file = new File(Environment.getExternalStorageDirectory(), "tmp_avatar_"
                        + String.valueOf(System.currentTimeMillis())
                        + ".jpg");
                    mImageCaptureUri = Uri.fromFile(file);

                    try {
                        intent.putExtra(
                            android.provider.MediaStore.EXTRA_OUTPUT,
                            mImageCaptureUri);
                        intent.putExtra("return-data", true);

                        getActivity().startActivityForResult(intent,
                            PICK_FROM_CAMERA);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }

                    dialog.cancel();
                } else {
                    Intent intent = new Intent();

                    intent.setType("image/*");
                    intent.setAction(Intent.ACTION_GET_CONTENT);

                    getActivity().startActivityForResult(
                        Intent.createChooser(intent,
                            "Complete action using"), PICK_FROM_FILE);
                }
            }
        });
        final AlertDialog dialog = builder.create();

        Button show = (Button) view.findViewById(R.id.btn_choose);
        show.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // Switch the tab content to display the list view.
                dialog.show();
            }
        });

    return view;
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (resultCode != Activity.RESULT_OK)
            return;

        if (requestCode == PICK_FROM_FILE) {
            mImageCaptureUri = data.getData();
            // mPath = getRealPathFromURI(mImageCaptureUri); //from Gallery

            if (mPath == null)
                mPath = mImageCaptureUri.getPath(); // from File Manager

            if (mPath != null)
                bitmap = BitmapFactory.decodeFile(mPath);
        } else {
            mPath = mImageCaptureUri.getPath();
            bitmap = BitmapFactory.decodeFile(mPath);
        }
        mImageView.setImageBitmap(bitmap);  
    }

    public String getRealPathFromURI(Uri contentUri) {
        String [] proj = {MediaStore.Images.Media.DATA};
        Cursor cursor = managedQuery(contentUri, proj, null, null,null);

        if (cursor == null) return null;

        int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    }
}