对于某些手机，Android data.getData()从CameraActivity返回null [英] Android data.getData() returns null from CameraActivity for some phones

问题描述

我的onActivityResult中发生致命错误，原因是相机活动回来了.我挠头的是，该错误仅在少数几部手机上发生(基于受影响的用户数量)，而大多数手机似乎都没错.我可以在Nexus 6(运行Lollipop 5.1.1)上复制该错误，而我的Note 5(也是5.1.1)完全没有问题.

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.

问题是当我尝试从data.getData()分配imageUri时.在Note 5上进行调试，data.mData等于"content://media/external/images/media/2215"，而在Nexus 6上，data.mData为null.

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.

我知道这是一个关于SO的常见问题，但到目前为止，我还没有发现任何对我有帮助的东西.谁能指出我的解决方案并提供答案?

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?

为结果启动相机活动的方法

@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();
    }
}

非常感谢您对此提供的任何帮助！

I greatly appreciate any help on this one!

推荐答案

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

相机应用程序无需返回指向照片的Uri，因为它不属于

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:

• 在ACTION_IMAGE_CAPTURE Intent中提供EXTRA_OUTPUT，在这种情况下，您知道应该将图像存储在什么位置，而不必依赖getData()或

• 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

在响应Intent中使用data附加字符，它将是图像缩略图的Bitmap

Use the data extra in the response Intent, which will be a Bitmap of a thumbnail of the image

您的下一个bug在这里:

Your next bug is here:

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

除非您通过EXTRA_OUTPUT提供了到该位置的路径，否则无需将图像存储为可以访问的文件.

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.

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