How to open Gmail Compose when a button is clicked in Android App?

Question

Hi

I am trying to open up Gmail Compose screen when a button is clicked in my Android App. Do I need some API key for this from Google? or what do I need to do in my button onClickListener?

Any kind of insight is much appreciated.

Answer 1

I don't know that you can specifically launch gmail. Have you tried this in your onClickListener

Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
emailIntent.setType("plain/text");
startActivity(emailIntent);  

You can find more details here: Email android intent

Answer 2

As JeffC pointed out, it is easy to essentially tell Android that you want to send something email-like and have Android give users a list of choices, which will probably include GMail. If you specifically want GMail, you have to be a bit cleverer. (Note that the correct MIME type is actually "text/plain", not "plain/text". Do to an implementation oddity, GMail seems to be the only activity which responds to the latter, but this isn't a behavior I would count on.)

The following App demonstrates the principle you can follow: actually examine all of the activities which say they can handle your SEND intent and see if any of them look like GMail.

package com.stackoverflow.beekeeper;

import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;

import java.util.List;

public class StackOverflowTest extends Activity {
  /** Called when the activity is first created. */
  @Override public void onCreate(final Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    final Intent intent = new Intent(android.content.Intent.ACTION_SEND);
    intent.setType("text/plain");
    final PackageManager pm = getPackageManager();
    final List<ResolveInfo> matches = pm.queryIntentActivities(intent, 0);
    ResolveInfo best = null;
    for (final ResolveInfo info : matches)
      if (info.activityInfo.packageName.endsWith(".gm") ||
          info.activityInfo.name.toLowerCase().contains("gmail")) best = info;
    if (best != null)
      intent.setClassName(best.activityInfo.packageName, best.activityInfo.name);
    startActivity(intent);
  }
}