Sending SMS using Android Studio 3.0

Question

Sending an SMS (not just creating the text and requiring the user to hit send) can't be that difficult, and yet I've spent the past eleven hours reading every stackoverflow entry and failing nonetheless. I'm now wondering if maybe the method has changed recently since none of the examples seem to work. If someone could help me with this, I'd be grateful. This is my first post, so my apologies if I'm not following the conventions of the community.

Here is my AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="joe.sms">

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

And here is my MainActivity:

package.joe.sms;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.telephony.SmsManager;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        SmsManager smsManager = SmsManager.getDefault();
        smsManager.sendTextMessage("+1716255xxxx", null, "Test message", null, null);
    }
}

Note: I use my full phone number in the actual code.

And here is the result:

error message screen shot

Thanks, in advance, for your assistance.

Answer 1

Implement the code like this,

  private static final int SEND_SMS_CODE = 23;

Checking permission is given, if permission is granted send SMS else asking for the permission.

private void permissionCheck(){
    if (isSendSmsAllowed()) {
          sendSms();
          return;
      }

    requestSmsSendPermission();}

Function to send SMS.

private void sendSms(){
    SmsManager sms = SmsManager.getDefault();
              ArrayList<String> parts = sms.divideMessage("MESSAGE");
              sms.sendMultipartTextMessage(90******, null, parts, null,
                null);}

Requesting permission if not granted.

//Requesting permission
  private void requestSmsSendPermission() {

    if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.SEND_SMS)) {
      //If the user has denied the permission previously your code will come to this block
      //Here you can explain why you need this permission
      //Explain here why you need this permission
    }

    //And finally ask for the permission
    ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.SEND_SMS },
      SEND_SMS_CODE);
  }

Hope it may help you.