Android: How to send message programmatically by using WhatsApp, WeChat?

Question

How to use messaging in android application by using WhatsApp and WeChat?

Actually requirement is to send sms using WhatsApp and We

Answer 1

This is the simplest example that I get

/**
 * sends message to the specific application
 * @param text The message that user wants to send
 * @param view is the activity view of the application
 */
public void sendMessage(String text, View view){
    Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.setType("text/plain");
    intent.setPackage("com.example.appname");//For whatsapp you can use com.whatsapp
    if (intent !=null){
        intent.putExtra(Intent.EXTRA_TEXT, text);
        startActivity(intent);
    }else{
        Snackbar.make(this, "Application not found.", Snackbar.LENGTH_SHORT).show();
    }
}