Android Studio-在拨号盘中执行USSD代码

Question

I have a problem right now with my code, i dont know if anybody can help me. I need to run a USSD code in my dial pad, and i'm using this code:

Intent i = new Intent(Intent.ACTION_DIAL);
i.setData(Uri.parse("tel:"+  Uri.encode("##873283#")));

startActivity(i);

So that open the dial pad and doesn't do anything. If i insert that manually, the USSD code is run correctly.

Beware this USSD code, executes without the call button.

You can check this video where i'm running the code manually: Video 1

Running the code from the app (it will receives a command 'update' and execute the code i posted): Video 2

I think that code is only executed if we have keypress's. Its that the problem? There is a way i can simulate that?

Thank you so much

Answer 1

If you want to initiate the call directly without user's interaction , you can use action Intent.ACTION_CALL. Due to security on the latest SDKs, you initially have to ask for some permissions:

private void dialNumber(final String phoneNumber) {
    //permission is automatically granted on sdk<23 upon installation
    if (Build.VERSION.SDK_INT >= 23) {
        //Check if you have permissions to execute a call (number or USSD)
        if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
            Log.v("TAG","Permission is granted");
            startActivity(new Intent(ACTION_CALL, Uri.fromParts("tel", phoneNumber, null)));

        } else {
            //Request permissions if we don't have them
            Log.v("TAG","Permission is revoked");
            ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.CALL_PHONE}, 1);
            startActivity(new Intent(ACTION_CALL, Uri.fromParts("tel", phoneNumber, null)));
        }
    }
    else {
        Log.v("TAG","Permission is granted");
        startActivity(new Intent(ACTION_CALL, Uri.fromParts("tel", phoneNumber, null)));
    }

}

Add the following permission (before application tag) in your AndroidManifest.xml:

<uses-permission android:name="android.permission.CALL_PHONE" />

Call the method when you need to use it and pass in a phone number as string:

dialNumber("##323232#");

OR

dialNumber(123456789.toString());

Video I just took now here