如何使用Android发送HTML附件(Java)

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

import java.io.File;

public class MainActivity extends AppCompatActivity {

    private Button sendButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        sendButton = findViewById(R.id.send_button);
        sendButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sendEmailWithAttachment();
            }
        });
    }

    private void sendEmailWithAttachment() {
        Intent emailIntent = new Intent(Intent.ACTION_SEND);
        emailIntent.setType("text/html");
        emailIntent.putExtra(Intent.EXTRA_EMAIL, new String[]{"recipient@example.com"});
        emailIntent.putExtra(Intent.EXTRA_SUBJECT, "Email with HTML attachment");
        emailIntent.putExtra(Intent.EXTRA_TEXT, "Please see the attached HTML file.");

        // Attach the HTML file
        File file = new File(getFilesDir(), "attachment.html");
        Uri uri = Uri.fromFile(file);
        emailIntent.putExtra(Intent.EXTRA_STREAM, uri);

        startActivity(Intent.createChooser(emailIntent, "Send email..."));
    }
}

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />