Path issue while saving and displaying an image in Android

问题

This might be my stupidity in writing paths but here is my code and it is failing to find configured root. getUriForFile is the one causing errors.

@Override
public void onClick(View v) {
    if (v.getId() == R.id.main_activity_camera_access_button) {
        Log.d(TAG, "clicked");
        Toast.makeText(getContext(), R.string.first_activity_toast_opening_camera, Toast.LENGTH_SHORT).show();
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

        if(intent.resolveActivity(getActivity().getPackageManager()) != null) {
            mPhotoFile = null;
            try {
                mPhotoFile = createImageFile();
            } catch (IOException ex) {
                Log.d(TAG, "exception while creating photo file");
            }
            if(mPhotoFile != null){
                mfileUri = FileProvider.getUriForFile(getContext(), "edu.lclark.imagineyourwall.fileprovider", mPhotoFile);
                intent.putExtra(MediaStore.EXTRA_OUTPUT, mfileUri); // set the image file name

                // start the image capture Intent
                startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
            }
        }
            //mfileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE); // create a file to save the image
    }
}

I have a xml directory under res and in there is my my_paths.xml. Here is the code for the my_paths.xml.

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="my_images"
    path="Android/data/edu.lclark.imagineyourwall.name/files/Pictures" />
</paths>

Also, my manifest looks like this, at least the provider part.

 <provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="edu.lclark.imagineyourwall.fileprovider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/my_paths"></meta-data>
    </provider>

回答1:

I think you're following Android Developer documentation for this right? If you're not targeting Android N (Nougat), it is safe to remove the getUriForFile line and modifyintent.putExtra(MediaStore.EXTRA_OUTPUT, mfileUri) to intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(mPhotoFile)).

According to Android developer documentation;

For more recent apps targeting Android N and higher, passing a file:// URI across a package boundary causes a FileUriExposedException. Therefore, we now present a more generic way of storing images using a FileProvider.

来源：https://stackoverflow.com/questions/39135994/path-issue-while-saving-and-displaying-an-image-in-android

标签

android

path

android-fileprovider