Android mailto：带附件的链接

Question

我遇到此代码的问题，不知何故我无法将图片附加到电子邮件中。

package com.example.video.MenuItems;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import com.example.video.R;

public class Appointment extends AppCompatActivity {
    private static final int PICK_FROM_GALLERY = 101;
    EditText etEmail,etSubject,etMessage;
    TextView tvAttachment;
    String email;
    String subject;
    String message;
    Uri URI = null;       

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_appointment);
        
        etEmail = findViewById(R.id.etTo);
        etSubject = findViewById(R.id.etSubject);
        etMessage = findViewById(R.id.etMessage);
        tvAttachment = findViewById(R.id.tvAttachment);
        
        Button attachment = findViewById(R.id.btAttachment);
        attachment.setOnClickListener(v -> openFolder());
        Button Sent = findViewById(R.id.btnSenTemail);
        Sent.setOnClickListener(v -> sendEmail());
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == PICK_FROM_GALLERY && resultCode == RESULT_OK) {
            URI = data.getData();
            tvAttachment.setText(URI.getLastPathSegment());
            tvAttachment.setVisibility(View.VISIBLE);
        }
    }

    public void sendEmail() {
        try {
            email = etEmail.getText().toString();
            subject = etSubject.getText().toString();
            message = etMessage.getText().toString();
            final Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
            Intent intent = new Intent(Intent.ACTION_SEND);
            intent.setData(Uri.parse("mailto:"));
            intent.putExtra(Intent.EXTRA_EMAIL, new String[]{"klavia3000@gmail.com"});
            intent.putExtra(Intent.EXTRA_SUBJECT,subject);
            intent.putExtra(Intent.EXTRA_TEXT,message);

            intent.setType("message/rfc822");
            startActivity(Intent.createChooser(intent, "Choose your Email"));

            if (URI != null) {
                emailIntent.putExtra(Intent.EXTRA_STREAM, URI);
            }
            emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, message);
            this.startActivity(Intent.createChooser(emailIntent, "Sending email..."));
        } catch (Throwable t) {
            Toast.makeText(this, "Request failed try again: "+ t.toString(), Toast.LENGTH_LONG).show();
        }
    }

    public void openFolder() {
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        intent.putExtra("return-data", true);
        startActivityForResult(Intent.createChooser(intent, "Complete action using"), PICK_FROM_GALLERY);
    }
}