FileProvider crash - npe attempting to invoke XmlResourceParser on a null String

Question

The problem was that in Manifest I had this line:

android:authorities="com.example.asd.fileprovider"

and when calling getUriForFile I was passing:

Uri contentUri = FileProvider.getUriForFile(getApplicationContext(), "com.example.asd", newFile); 

So changed from "com.example.asd" to "com.example.asd.fileprovider" and it worked

You can do this without hardcoding the package name with an additional benefit of being able to run multiple variants on the same device (think release and debug with applicationIdSuffix, see these issues):

Based on FileProvider.java:560

final ProviderInfo info = context.getPackageManager()
        .resolveContentProvider(authority, PackageManager.GET_META_DATA);
final XmlResourceParser in = info.loadXmlMetaData( //560
        context.getPackageManager(), META_DATA_FILE_PROVIDER_PATHS);

you were using the wrong authority and it didn't find the ContentProvider (info == null).

Change your manifest to (${applicationId} will be replaced by Manifest Merger)

android:authorities="${applicationId}.share"

and

Uri uri = FileProvider.getUriForFile(context, context.getPackageName() + ".share", result);

The .share suffix is optional, in case you have a real ContentProvider which is better to have the package name as the authority.

In my case, I got the error because the

BuildConfig.APPLICATION_ID

was being imported from

import android.support.v4.BuildConfig;

So the string it returned was "android.support.v4" instead of my project package name. Check out the import file is from your import project.Buildconfig and not another. Example:

import com.example.yourProjectName.BuildConfig;

Finally, in <provider> tag in Manifest I have android:authorities="${applicationId}" to always get my project package name as the authority

<manifest>
   ..
   ..
   <application>
    ..
    ..
       <provider
            android:name="android.support.v4.content.FileProvider"
            android:authorities="${applicationId}"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/ruta_fileprovider" />
        </provider>

    </application>

</manifest>

First, be sure that you provider android:authorities does not conflict with your other providers. Besides that you may choose any name for the last part of its name: "provider", "fileprovider" etc., but app crashes when there are more than one android:authorities listed, while documentation states that it allows multiple values listed.

file:// scheme is now not allowed to be attached with Intent on targetSdkVersion >= 24 (Android N 7.0), only content:// is always passed for all devices (Android 5, 6 and 7). But we encountered that Xiaomi breaks this Google convention and sends file://, hence data.getData().getAuthority() gives empty string.

final String uriScheme = currentUri.getScheme();
if ("content".equals(uriScheme)) {
    // getting full file path (works with some providers, i.e. Gallery)
    path = FileUtils.getPath(getContext(), currentUri);
    if (path != null) {
         currentFile = new File(path);
    }
} else if ("file".equals(uriScheme)) {
    // in a rare case we received file:// in currentUri, we need to:
    // 1. create new File variable from currentUri that looks like "file:///storage/emulated/0/download/50044382b.jpg"
    // 2. generate a proper content:// Uri for it
    currentFile = new File(currentUri.getPath());
    String authority = data.getData().getAuthority();
    if (authority != null && !authority.isEmpty()) {
        currentUri = FileProvider.getUriForFile(getActivity(), authority, currentFile);
    }
} else {
    // throw exception
}

Also, the bug when FileProvider.getUriForFile() resulted in crash java.lang.IllegalArgumentException: Failed to find configured root that contains /storage/emulated/0/Android/data/com.example/files/attachments/image.jpg was fixed in Android Support Library v24.2.0. The problem was that FileProvider.java did not see external-path folders.

If you're building your AUTHORITY at runtime using BuildConfig make sure you use the full class name including your package name.

Bad:

final String AUTHORITY = BuildConfig.APPLICATION_ID + ".provider";

Good:

final String AUTHORITY = com.mycompany.myapp.BuildConfig.APPLICATION_ID + ".provider";