Develop Reference

Send a text message for a specific number using WhatsApp

I'm trying to open WhatsApp with both text message and phone number, the phone number is OK but the message are not being displayed
Here's my code:
Intent sendIntent = new Intent("android.intent.action.MAIN");
sendIntent.SetComponent(new ComponentName("com.whatsapp", "com.whatsapp.Conversation"));
sendIntent.SetType("text/plain");
sendIntent.PutExtra("jid", phone_number + "#s.whatsapp.net");
sendIntent.PutExtra(Intent.ExtraText, "extra_text test");
sendIntent.PutExtra("sms_body", "sms_body test");
sendIntent.PutExtra("body", "body test");
sendIntent.PutExtra("text", "text test");
context.StartActivity(sendIntent);
I've tried all these "PutExtra" options but it's not working.
Thanks in advance!

What they allow via Intent extras is limited.
C# Example:
var sendIntent = new Intent();
sendIntent.SetPackage("com.whatsapp");
sendIntent.SetAction(Intent.ActionSend);
sendIntent.PutExtra(Intent.ExtraText, "StackOverflow.");
sendIntent.SetType("text/plain");
StartActivity(sendIntent);
Ref: https://www.whatsapp.com/faq/android/28000012

How to share application link via message share application

For my application, I would like to give share option.
For this, I have edit text to give phone number and a share button. If user gives a valid number and clicks share button, list of all available message sending application should list. If user selects an application from the list then a message with the application link should send his phone using the selected application.
How can I implement this? Please help.

Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, "message link");
sendIntent.setType("text/plain");
startActivity(Intent.createChooser(sendIntent, "Chooser title text"));

try this
Intent sharingIntent = new Intent(Intent.ACTION_SEND);
sharingIntent.setType("text/plain");
sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT,"your application link"));
startActivity(Intent.createChooser(sharingIntent,"Share using"));

Try Below code,This is exactly that you want ,
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(android.content.Intent.EXTRA_TEXT, Your_EditText_object.getText().toString());
sendIntent.setType("text/plain");
startActivity(Intent.createChooser(sendIntent, "Your Title"));

Try this:
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, "This is my text to send.");
sendIntent.setType("text/plain");
startActivity(Intent.createChooser(sendIntent, getResources().getText(R.string.send_to)));
References link:
https://developer.android.com/training/sharing/send.html

public static void callShare(Context theCtx, String theImagePath, String theText)
{
// Pass the message and Image path that you want to share
File myImageFile = new File(theImagePath);
String shareBody = theText; //"Here is the share content body " ;
Intent sharingIntent = new Intent(Intent.ACTION_SEND);
if (myImageFile.exists()) {
// email address is required to be filled.
sharingIntent.setType("image/jpeg");
// "file://" and .getAbsolutePath is very important for Extra_Stream.
sharingIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse("file://" + myImageFile.getAbsolutePath()));
} else if (!theText.isEmpty()) {
sharingIntent.setType("text/*");
}
sharingIntent.putExtra(Intent.EXTRA_SUBJECT, ""); //"Subject here"
sharingIntent.putExtra(Intent.EXTRA_TEXT, shareBody);
sharingIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
theCtx.startActivity(Intent.createChooser(sharingIntent, "Share via"));
}

Action send facebook only

How can I do Action.SEND with Intent to show only facebook app(or to open it at once)?
I did it for all app witg Action.SEND:
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, "Test text");
sendIntent.setType("text/plain");
startActivity(sendIntent);

(Android) Share PNG from Drawable folder direct to WhatsApp

I found the code for sharing text directly to WharsApp from my app:
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, "This is my text to send.");
sendIntent.setType("text/plain");
startActivity(sendIntent);
sendIntent.setPackage("com.whatsapp");
Now I want to share a PNG from my Drawable folder (R.drawable.image2share) directly to WhatsApp. How do I do that?

Try this:
Uri imageUri = Uri.parse("android.resource://" + getPackageName() + "/drawable/image2share");
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, "This is my text to send.");
sendIntent.putExtra(Intent.EXTRA_STREAM, imageUri);
sendIntent.setType("image/png");
sendIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
sendIntent.setPackage("com.whatsapp");
startActivity(Intent.createChooser(sendIntent, "send"));

Is it possible to put a string resource in EXTRA_TEXT

I have this line that I share the text "text to share"
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, "text to share");
sendIntent.setType("text/plain");
startActivity(sendIntent);
but I want to share a #string no "text to share"

You can just use getResources() method to get access to your resources and then use getString():
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, getResources().getString(R.string.text_to_share));
sendIntent.setType("text/plain");
startActivity(sendIntent);