Develop Reference

How can I create chooser Intent to choose from gmail app, yahoo mail app or browser?

I tried to search on Google but didn't find an appropriate answer.
I want to click a TextView and it will show a dialog that allows the user to choose optional email.
Any suggestion? Thanks in advance

Try this:
Intent intet = new Intent(Intent.ACTION_SEND);
intet.setType("message/rfc822");
intet.putExtra(android.content.Intent.EXTRA_TEXT, body);
startActivity(intet);
This will open up a dialog that contains a list of apps installed on the device that can send an email.
Hope this helps. :)

A better option is to use the following, it will only open the applications that provide mail facility and not all apps that can share data.
Intent emailIntent = new Intent(Intent.ACTION_VIEW);
Uri data = Uri.parse("mailto:?subject=" + "subject" + "&body=" + "body" + "&to=" + email_id);
emailIntent.setData(data);
startActivity(emailIntent);
"subject" is the subject of mail, "body" is the content of the mail, and "email_id" is the id of the receiver of the mail.
You can keep the subject , body and email_id empty if you want the user to fill in the spaces.

for open gmail app
try this code:
Intent gmail = new Intent(Intent.ACTION_VIEW);
gmail.setClassName("com.google.android.gm","com.google.android.gm.ConversationListActivity");
startActivity(gmail);

How to find out a contact is a whatsapp user or not

I'm trying to find out whether a particular contact is a whatsapp user or not.
This goes my requirement:
I have a text to share and also have a phone number of a person as well. The priority of my sharing goes as follows
If the phone number is already present in CONTACTS and :
if the contact is a whatsapp user, I should call sharing intent of SEND with package set as "com.whatsapp"
i.e:
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("text/plain");
intent.setPackage("com.whatsapp");
intent.putExtra(Intent.EXTRA_TEXT, message);
startActivity(intent);
if the contact not a whatsapp user, I should call intent for default messaging app.
i.e :
Intent intent = new Intent( Intent.ACTION_VIEW, Uri.parse( "sms:" + phoneNumber ) );
intent.putExtra( "sms_body", message );
startActivity(intent);
If the phone number is not present, create a contact and do as above.
My question now is, how do I find out whether my contact is a whatsapp user or not? Is whatsapp providing any API to find out that?
Thanks in advance
PS: I do not want to show a general sharing intent which shows a list of sharing apps. I may do that only if the device does not have whatsapp application at all.

send a whatsapp message automatically

how to send a whatsapp message to a specific contact automatically?I have searched but it just opens the chat of that specific person but does not send the message automatically
Here is the code that am using:
private void openWhatsappContact(String number) {
Uri uri = Uri.parse("smsto:" + number);
Intent i = new Intent(Intent.ACTION_SENDTO, uri);
i.setPackage("com.whatsapp");
startActivity(Intent.createChooser(i, ""));

I'm not sure you can send the message automatically, but try this to specify the message you want to send:
i.putExtra(Intent.EXTRA_TEXT, "This is my text to send.");
Reference:
https://www.whatsapp.com/faq/en/android/28000012

There is no direct way to do this because whatsapp does not offer an SDK interface.
You might have some luck with writing some accessibility automations or if you have root may be some xposed module.

Android: how to pre-populate an SMS message

I am writing an application that needs to pre-populate an SMS message with the first name of the contact when using the stock android SMS messenger.
For example if my contacts name is Alex Smith.
When I select Alex Smith to type a message to, I want the text box to already have
'Alex, '
at the beginning of the SMS.
Please how can I achieve that?

Fetch the contact name from contacts, and do like as follows:
String contactName = "Alex"; // get it from selected contact
Intent intent = new Intent( Intent.ACTION_VIEW, Uri.parse( "sms:" + phoneNumber ) );
intent.putExtra( "sms_body", contactName+"," );
startActivity( intent );

Just look over here:
Send SMS via intent
You use a Intent to send the SMS and attach some pre defined text via the EXTRA_TEXT attribute. Quite easy to do. And it works for the normal SHARE intent as well.

You can't change system apps, but you can send "share intent" from your app to SMS App. As you remember, when you push "share" button in some apps, you can share smth with SMS. (You'll have SMS with text that app put in intent). SO, put contact's name in "share intent" and send it to SMS app.

it's bit late, but i hope it will help future users.
void prePopulateSMS(final String mblNumVar, final String smsMsgVar) {
Log.d(TAG, "prePopulateSMS called. smsMsgVar: " + smsMsgVar);
Intent smsIntent = new Intent(android.content.Intent.ACTION_VIEW);
smsIntent.setType("vnd.android-dir/mms-sms");
smsIntent.putExtra("address", mblNumVar);
smsIntent.putExtra("sms_body", smsMsgVar);
startActivity(smsIntent);
}

show gmail screen directly... not thru selection

I am sort of new to android.
I am trying to send a msg via gmail and this is my code.
Intent intent = new Intent(Intent.ACTION_SENDTO);
String uriText;
uriText = "mailto:test#gmail.com?subject=Subject&body=this is test.";
uriText = uriText.replace(" ", "%20");
Uri uri = Uri.parse(uriText);
intent.setData(uri);
startActivity(Intent.createChooser(intent, "Select mailer"));
It works. But, before sending the msg, it shows a selection box
and asks me to choose either gmail or email.
How can I skip the selection box ?
Any help would be so appreciated.. Thanks.

How can I skip the selection box ?
You don't. You allow the user to choose what application they wish to use to send the message. Some users do not use Gmail.