آموزشی - ارسال ایمیل از طریق گوشی

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;


public class MainActivity extends Activity implements OnClickListener {

       EditText editTextEmail, editTextSubject, editTextMessage;
       Button btnSend, btnAttachment;
       String email, subject, message, attachmentFile;
       Uri URI = null;
       private static final int PICK_FROM_GALLERY = 101;
       int columnIndex;

       @Override
       protected void onCreate(Bundle savedInstanceState) {
              super.onCreate(savedInstanceState);
              setContentView(R.layout.activity_main);
              editTextEmail = (EditText) findViewById(R.id.editTextTo);
              editTextSubject = (EditText) findViewById(R.id.editTextSubject);
              editTextMessage = (EditText) findViewById(R.id.editTextMessage);
              btnAttachment = (Button) findViewById(R.id.buttonAttachment);
              btnSend = (Button) findViewById(R.id.buttonSend);

              btnSend.setOnClickListener(this);
              btnAttachment.setOnClickListener(this);
       }

       protected void onActivityResult(int requestCode, int resultCode, Intent data) {
              if (requestCode == PICK_FROM_GALLERY && resultCode == RESULT_OK) {
                     /**
                      * Get Path
                      */
                     Uri selectedImage = data.getData();
                     String[] filePathColumn = { MediaStore.Images.Media.DATA };

                     Cursor cursor = getContentResolver().query(selectedImage,filePathColumn, null, null, null);
                     cursor.moveToFirst();
                     columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                     attachmentFile = cursor.getString(columnIndex);
                     Log.e("Attachment Path:", attachmentFile);
                     URI = Uri.parse("file://" + attachmentFile);
                     cursor.close();
              }
       }

       @Override
       public void onClick(View v) {

              if (v == btnAttachment) {
                     openGallery();

              }
              if (v == btnSend) {
                     try {
                           email = editTextEmail.getText().toString();
                           subject = editTextSubject.getText().toString();
                           message = editTextMessage.getText().toString();

                           final Intent emailIntent = new Intent(
                                         android.content.Intent.ACTION_SEND);
                           emailIntent.setType("plain/text");
                           emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL,
                                         new String[] { email });
                           emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT,
                                         subject);
                           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 openGallery() {
              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);

       }

}