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

Question

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 onC

Answer 1

Intent intent = new Intent(Intent.ACTION_SEND).setType("text/plain")
                        .putExtra(Intent.EXTRA_EMAIL, new String[]{emails});
                List matches = activity.getPackageManager().queryIntentActivities(intent, 0);
                ResolveInfo best = null;
                for (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);
                }
                activity.startActivity(intent);