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我想发送附件的邮件，我已经编写了代码，这是工作正常，但在这里我写了文件名，我想附加在程序中，我不想要像这样，我希望它是由用户从SD卡中选择。如何做到这一点。将附件添加到电子邮件
public class DemoVoiceActivity extends Activity {
EditText txtTo,mSubject,mMessageBody,attachment;
String strSubject,strMessageBody;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
txtTo = (EditText)findViewById(R.id.to);
mSubject = (EditText)findViewById(R.id.subject);
mMessageBody = (EditText)findViewById(R.id.message_content);
attachment=(EditText)findViewById(R.id.attachment);
String[] strTo = {txtTo.getText().toString()};
strSubject = mSubject.getText().toString();
strMessageBody = mMessageBody.getText().toString();
Intent objIntent = new Intent(android.content.Intent.ACTION_SEND);
objIntent.putExtra(android.content.Intent.EXTRA_EMAIL, strTo);
objIntent.setType("plain/text"); objIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, strSubject);
objIntent.putExtra(android.content.Intent.EXTRA_TEXT, "MESSAGE"); objIntent.putExtra(android.content.Intent.EXTRA_STREAM,Uri.parse("file://"+Environment.getExternalStorageDirectory()+"/q.mp4"));
startActivity(objIntent);
finish();
}
}