Question

我有这样的代码，问题是当我想将它保存到sqlite时，错误消息显示我在图像路径中为空。这是主要活动

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

        if (resultCode == RESULT_OK) {
            if (requestCode == SELECT_PICTURE) {
                Uri selectedImageUri = data.getData();
                System.out.println("Data Image : "+selectedImageUri);
                selectedImagePath = getPath(selectedImageUri);
                System.out.println("Image Path : " + selectedImagePath);
                image1.setVisibility(View.VISIBLE);
                image1.setImageURI(selectedImageUri);
            }
        }
    }
private String getRealPathFromURI(Uri contentURI) {
        String result;
        Cursor cursor = getContentResolver().query(contentURI, null, null, null, null);
        if (cursor == null) { // Source is Dropbox or other similar local file path
            result = contentURI.getPath();
        } else {
            cursor.moveToFirst();
            int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
            result = cursor.getString(idx);
            cursor.close();
        }
        return result;
    }
public String getPath(Uri uri) {
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = managedQuery(uri, projection, null, null, null);
        int column_index = cursor
                .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    }

Answer 1

我使用这种方法从相机拍摄照片。

public abstract class Window2<TViewModel> : Window {

    protected TViewModelViewModel {
        get { return (TViewModel)this.DataContext; }
    }
}

然后onActivityResult将如下所示：

private void capturePhoto() {
// save this Uri in a field variable.
    uri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
            new ContentValues());
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
    startActivityForResult(intent, CAMERA_REQUEST);
}

Answer 2

在清单文件集权限
中
检查onActivityResult方法授予的权限及其授予后的READ_EXTERNAL_STORAGE
如果它具有权限，则调用doCreatePath()并在onRequestPermissionsResult上设置相同的权限。

void doCreatePath()
 {

        try {

            Uri originalUri = filePath;
            String pathsegment[] = originalUri.getLastPathSegment().split(":");
            String id = pathsegment[0];
            final String[] imageColumns = {MediaStore.Images.Media.DATA};
            final String imageOrderBy = null;
            Uri uri = getUri();
            Cursor imageCursor = getActivity().getContentResolver().query(uri, imageColumns,
                    null, null, null);

            if (imageCursor.moveToFirst()) {
                int column_index_data = imageCursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                realPath = imageCursor.getString(column_index_data);
                System.out.print("value" + realPath);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

有效！。

Android中的图片路径为null

2 个答案: