Question

我希望使用设备相机显示图像捕获，并且我已使用下面的代码。但是我在onActivityResult中返回的数据中获得空值。所以请为我提供解决方案..

感谢，

我的代码是：

          File root = new File(Environment.getExternalStorageDirectory()+"/TestCameraGallery");
                 root.mkdirs();
                 MyCameraGallery = new File(root, "mycamerapicname");

                 Uri outputFileUri = Uri.fromFile(MyCameraGallery );

                 Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                 intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);

                 startActivityForResult(intent, CAMERA_PIC_REQUEST);

     @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{
    super.onActivityResult(requestCode, resultCode, data);

            if(requestCode == CAMERA_PIC_REQUEST)
    {
        Uri uri = data.getData();
             }
     }

uri的值为null并给出空指针异常所以请帮助我

Answer 1

使用您的代码，您将获得低分辨率图像。如果您想获得高分辨率图像，可以参考this answer.

您也可以参考this blog

Answer 2

最终得到解决方案



       String  imageName = "image.jpg" ;    

       ContentValues values = new ContentValues();

        values.put(MediaStore.Images.Media.TITLE, imageName);

       uri_captureImage = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);

        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, uri_captureImage);

        startActivityForResult(intent, requestCode_camera);

String imageName = "image.jpg" ; ContentValues values = new ContentValues(); values.put(MediaStore.Images.Media.TITLE, imageName); uri_captureImage = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values); Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); intent.putExtra(MediaStore.EXTRA_OUTPUT, uri_captureImage); startActivityForResult(intent, requestCode_camera);

和onAcitivity为结果

String[] projection = new String[] {MediaStore.Images.Media.DATA};

     Cursor cursor = managedQuery(uri_captureImage, projection, null, null, null);
     cursor.moveToFirst();

String capimage_path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA));

在Android设备中使用相机显示图像捕获

2 个答案: