Grant external access to files in android (FileUriExposedException)

file_permission_android.txt

1- Create Android resource directory (XML type) in res folder;
2- Create new xml file inside de directory called (provider_paths.xml), with content:

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

3- Create provider tag on AndroidManifest.xml inside the application tag:

    <application
        android:name=".MainApplication"
        android:allowBackup="false"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        tools:replace="android:allowBackup">
        
        <!-- Provide to grant access to files for share -->
        <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>    
    
4- Now you can open, edit and share files throught Intent. 

Sharing image example:

      Intent intent = new Intent(Intent.ACTION_SEND);
      intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {

          Uri fileURI = FileProvider.getUriForFile(
                  getContext(),
                  getContext().getApplicationContext()
                          .getPackageName() + ".provider", file);

          intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
          intent.setDataAndType(fileURI, "image/*");
          intent.putExtra(Intent.EXTRA_STREAM, fileURI);

          startActivity(intent);

      } else {
          intent.setType("image/*");
          intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file));
          startActivity(Intent.createChooser(intent, "Compartilhar imagem via"));
      }