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

<?xml version="1.0" encoding="utf-8"?> 
<paths xmlns:android="http://schemas.android.com/apk/res/android"> 
  <external-path name="external_files" path="."/> 
</paths>

... 
imageUri = Uri.fromFile(createImageFile()); 
 
 
replace with : 
 
 
File file = createImageFile(); 
        imageUri = FileProvider.getUriForFile(mActivity, mActivity.getPackageName() + ".provider", file); 
 
 
...