EmailUtil.java

package org.edx.mobile.util;

import android.content.Intent;
import android.support.v4.app.FragmentActivity;
import android.widget.Toast;
import org.edx.mobile.R;
import org.edx.mobile.logger.Logger;
import org.edx.mobile.view.dialog.IDialogCallback;

public class EmailUtil {

    private static final Logger logger = new Logger(EmailUtil.class.getName());

    public static void openEmailClient(final FragmentActivity activityContext, final String to,
                                 final String subject, final String email, Config config) {
        // verify if the app is running on zero-rated mobile data?
        if (NetworkUtil.isConnectedMobile(activityContext) && NetworkUtil.isOnZeroRatedNetwork(activityContext, config)) {
            // inform user they may get charged for sending email
            IDialogCallback callback = new IDialogCallback() {
                @Override
                public void onPositiveClicked() {
                    sendEmailIntent(activityContext, to, subject, email);
                }

                @Override
                public void onNegativeClicked() {
                }
            };

            MediaConsentUtils.showLeavingAppDataDialog(activityContext, callback);
        } else {
            sendEmailIntent(activityContext, to, subject, email);
        }
    }

    private static void sendEmailIntent(FragmentActivity activityContext, String to, String subject,
                                        String email){
        Intent email_intent = new Intent(Intent.ACTION_SEND);
        email_intent.putExtra(Intent.EXTRA_EMAIL, new String[] { to });
        email_intent.putExtra(Intent.EXTRA_SUBJECT, subject);
        email_intent.putExtra(Intent.EXTRA_TEXT, email);
        email_intent.setType("plain/text");

        try {
            email_intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

            if(activityContext!=null){
                // add flag to make sure this call works from non-activity context
                Intent targetIntent = Intent.createChooser(email_intent,
                        activityContext.getString(R.string.email_chooser_header));
                targetIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                activityContext.startActivity(targetIntent);
            }

        } catch (android.content.ActivityNotFoundException ex) {
            //There is no activity which can perform the intended share Intent
            Toast.makeText(activityContext, activityContext.getString(R.string.email_client_not_present),
                    Toast.LENGTH_SHORT)
                    .show();
            logger.error(ex);
        }
    }
}