onActivityResult : android.net.Uri android.content.Intent.getData()' on a null object reference

Question

当我从相机中单击图像或从相机中按下时，它的工作完美。

当我 select 来自图库的图像时，Ii 也能完美工作，但是当我从图库返回时发生错误，而没有 select 在这一行 filePath = data.getData(); 上输入任何图像。

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.net.Uri android.content.Intent.getData()' on a null object reference

private void changeProfileImage() {
        try {
            PackageManager pm = getPackageManager();
            int hasPerm = pm.checkPermission(Manifest.permission.CAMERA, getPackageName());
            if (hasPerm == PackageManager.PERMISSION_GRANTED) {
                final CharSequence[] options = {"Take Photo", "Choose From Gallery", "Cancel"};
                android.support.v7.app.AlertDialog.Builder builder = new android.support.v7.app.AlertDialog.Builder(AddProduct.this);
                builder.setTitle("Select Option");
                builder.setItems(options, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int item) {
                        if (options[item].equals("Take Photo")) {
                            dialog.dismiss();
                            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                            startActivityForResult(intent, PICK_IMAGE_CAMERA);
                        } else if (options[item].equals("Choose From Gallery")) {
                            dialog.dismiss();
                            Intent pickPhoto = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                            startActivityForResult(pickPhoto, PICK_IMAGE_GALLERY);
                        } else if (options[item].equals("Cancel")) {
                            dialog.dismiss();
                        }
                    }
                });
                builder.show();
            } else Toast.makeText(this, "Camera Permission error", Toast.LENGTH_SHORT).show();
        } catch (Exception e) {
            Toast.makeText(this, "Camera Permission error", Toast.LENGTH_SHORT).show();
            e.printStackTrace();
        }
    }    

---

@Override
        public void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
            if (requestCode == PICK_IMAGE_CAMERA) {
                try {
                    bitmap = (Bitmap) data.getExtras().get("data");
                    pro_img.setImageBitmap(bitmap);
                    img = getEncoded64ImageStringFromBitmap(bitmap);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            } else if (requestCode == PICK_IMAGE_GALLERY) {
                try {
                    filePath = data.getData();
                    if (filePath != null) {
                        bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), data.getData());
                        pro_img.setImageBitmap(bitmap);
                        img = getEncoded64ImageStringFromBitmap(bitmap);
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

Answer 1

是的，如果您没有选择任何图像而只是从图库中返回，则 Intent 数据中将 return 为空。在获取 getData()

之前检查 data!=null

@Override
        public void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
            if (requestCode == PICK_IMAGE_CAMERA) {
                try {
                    bitmap = (Bitmap) data.getExtras().get("data");
                    pro_img.setImageBitmap(bitmap);
                    img = getEncoded64ImageStringFromBitmap(bitmap);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            } else if (requestCode == PICK_IMAGE_GALLERY) {
                try {
                      if(data!=null)
                     { // user selects some Image
                    filePath = data.getData();
                    if (filePath != null) {
                        bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), data.getData());
                        pro_img.setImageBitmap(bitmap);
                        img = getEncoded64ImageStringFromBitmap(bitmap);
                    }
                   }
                   else
                   { // user simply backpressed from gallery
                   }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }