Android data.getData() returns null from CameraActivity for some phones

问题

I have a fatal error occurring in my onActivityResult coming back from a camera activity. What has me scratching my head is that the error is only happening on a handful of phones (based on the number of affected users) while there seems to be nothing wrong for the majority. I can duplicate the error on my Nexus 6 (running Lollipop 5.1.1) while my Note 5 (also 5.1.1) has no problems at all.

The problem is when I am trying to assign the imageUri from data.getData(). Debugging on the Note 5, data.mData equals "content://media/external/images/media/2215" while on the Nexus 6, data.mData is null.

I know this is a common question asked on SO but I haven't found anything that has helped me so far. Can anyone point me to the solution for this and provide an answer?

Method Starting Camera Activity for Result

@OnClick(R.id.change_image_camera) public void takePicture(){
    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);}

onActvityResult

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

    if (resultCode == Activity.RESULT_OK) {

        Uri imageUri = data.getData(); //The trouble is here

        String realPath = Image.getPath(this, imageUri); //getPath crashes because imageUri is null

        Image.compressImage(realPath);

        File file = new File(realPath);

        Bundle extra = new Bundle();
        extra.putString("URL", realPath);
        returnIntent.putExtras(extra);

        setResult(RESULT_OK, returnIntent);
        finish();
    }
}

I greatly appreciate any help on this one!

回答1:

Uri imageUri = data.getData(); //The trouble is here

There is no requirement for a camera app to return a Uri pointing to the photo, as that is not part of the ACTION_IMAGE_CAPTURE Intent protocol. Either:

Supply EXTRA_OUTPUT in your ACTION_IMAGE_CAPTURE Intent, in which case you know where the image should be stored, and do not need to rely upon getData(), or
Use the data extra in the response Intent, which will be a Bitmap of a thumbnail of the image

Your next bug is here:

String realPath = Image.getPath(this, imageUri);

There is no requirement that the image be stored as a file that you can access, unless you provide a path to that location via EXTRA_OUTPUT.

来源：https://stackoverflow.com/questions/32403265/android-data-getdata-returns-null-from-cameraactivity-for-some-phones

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