没有应用可以执行此操作（Android）

Question

I'm trying to make this program that when the user clicks a button, a message is sent to a whatsapp number

Here is the code in the onClick method

            Uri uri = Uri.parse("smsto:" + "xxxxxxxxxx"); //xxx.. is the mobile number
            Intent i = new Intent(Intent.ACTION_SENDTO, uri);
            i.putExtra(Intent.EXTRA_TEXT, "Check");
            i.setType("text/plain");
            i.setPackage("com.whatsapp");
            startActivity(Intent.createChooser(i, ""));

It shows that there are no apps that can perform this action. Why?

I removed

            i.setType("text/plain");

And it works. But the text "Check" is not sent. How to do that if this is not the way.

Answer 1

Your format is slightly different from the example given on the WhatsApp FAQ, so I would modify to match.

From this page :

Like most social apps on Android, WhatsApp listens to intents to share media and text. Simply create an intent to share text, for example, and WhatsApp will be displayed by the system picker:

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);

However, if you prefer to share directly to WhatsApp and bypass the system picker, you can do so by using setPackage in your intent:

sendIntent.setPackage("com.whatsapp");

This would simply be set right before you call startActivity(sendIntent);

Answer 2

Try this code to send ON whatsapp

public void SendWhatsapp(View view) {

PackageManager pm=getPackageManager();
try {

    Intent waIntent = new Intent(Intent.ACTION_SEND);
    waIntent.setType("text/plain");
    String text = "YOUR TEXT HERE";

    PackageInfo info=pm.getPackageInfo("com.whatsapp", PackageManager.GET_META_DATA);
    //Check if package exists or not. If not then code 
    //in catch block will be called
    waIntent.setPackage("com.whatsapp");

    waIntent.putExtra(Intent.EXTRA_TEXT, text);
    startActivity(Intent.createChooser(waIntent, "Share with"));

   } catch (NameNotFoundException e) {
    Toast.makeText(this, "WhatsApp not Installed", Toast.LENGTH_SHORT)
            .show();
  }  

 }