android crop image from gallery nullpointexception

问题

I'm working in Camera.i want to choose image from my gallery and crop selected photo and then show it in my imageview.i wrote some code but i have problem in cropping. this is a my error

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




  private void CropPictureFromGallery()
{



    Intent pickImageIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

    pickImageIntent.setType("image/*");
    pickImageIntent.putExtra("crop", "true");
    pickImageIntent.putExtra("outputX", 200);
    pickImageIntent.putExtra("outputY", 200);
    pickImageIntent.putExtra("aspectX", 1);
    pickImageIntent.putExtra("aspectY", 1);
    pickImageIntent.putExtra("scale", true);
    pickImageIntent.putExtra("outputFormat",
    startActivityForResult(pickImageIntent, PICK_FROM_GALLERY);

}




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

    if (resultCode == Activity.RESULT_OK){
        Uri targetUri = data.getData();
        Bitmap bitmap;
        try {
            bitmap = BitmapFactory.decodeStream(getActivity().getContentResolver().openInputStream(targetUri));
            mAvatar.setImageBitmap(bitmap);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

this is a my code I have problem in Cropping image because when i removed crop my app working perfect what am i doing wrong? if anyone knows solution please help me

回答1:

Select Action_Pick intent

                        Intent intent;
                        intent = new Intent(
                                Intent.ACTION_PICK,
                                android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                        intent.setType("image/*");
                        Intent chooser = Intent.createChooser(intent,
                                "Choose a Picture");
                        startActivityForResult(chooser,
                                RequestCode.REQ_GALLERY);

OnActivityResult get the image from URI

       case RequestCode.REQ_GALLERY:
        if (resultCode == Activity.RESULT_OK) {
            Uri PhotoURI = data.getData();
            Bitmap bitmapImage = null;
            try {
                bitmapImage = decodeBitmap(PhotoURI);
                BitmapFactory.decodeStream(getCurrActivity().getContentResolver().openInputStream(PhotoURI));

                doCrop(getImageUri(getCurrActivity(), bitmapImage));
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }
        break;

public Uri getImageUri(Context inContext, Bitmap inImage) {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);
String path = MediaStore.Images.Media.insertImage(inContext.getContentResolver(), inImage, "Title", null);
return Uri.parse(path);
 }

Apply crop operation

private void doCrop(Uri mCurrentPhotoPath) {
Intent cropIntent = new Intent("com.android.camera.action.CROP");
cropIntent.setDataAndType(mCurrentPhotoPath, "image/*");
cropIntent.putExtra("crop", "true");
cropIntent.putExtra("aspectX", 1);
cropIntent.putExtra("aspectY", 1);
cropIntent.putExtra("outputX", 320);
cropIntent.putExtra("outputY", 320);

File cameraFolder;

cameraFolder = new File(AppConstants.BASE_FOLDER);

if (!cameraFolder.exists()) {
    cameraFolder.mkdirs();
}

mSourceFileName = "/IMG_" + System.currentTimeMillis() + ".jpg";

File photo = new File(cameraFolder, mSourceFileName);
try {
    photo.createNewFile();
} catch (IOException e) {
    e.printStackTrace();
}

Uri mCropImageUri = Uri.fromFile(photo);

cropIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCropImageUri);

startActivityForResult(cropIntent, RequestCode.REQ_CROP_IMG);
 }

来源：https://stackoverflow.com/questions/33734107/android-crop-image-from-gallery-nullpointexception

标签

android

android-camera

android-bitmap

android-crop