Is it possible to block Outgoing SMS?

Question

Here is the Code which I am using,

public class MyCallControllerActivity extends Activity 
{
    static int Count;
 /** Called when the activity is first created         


        

Answer 1

I make it work but only with rooted device with permission MODIFY_PHONE_STATE

public class OutgoingSMSReceiver extends Service
{

private static final String CONTENT_SMS = "content://sms/";
static String messageId = "";

private class MyContentObserver extends ContentObserver
{

    Context context;
    private SharedPreferences prefs;
    private String phoneNumberBlocked;

    public MyContentObserver(Context context) {
        super(null);
        this.context = context;
    }

    @Override
    public void onChange(boolean selfChange)
    {
        super.onChange(selfChange);

        prefs = context.getSharedPreferences("com.example.testcall", Context.MODE_PRIVATE);
        phoneNumberBlocked = prefs.getString("numero", "");

        Uri uriSMSURI = Uri.parse(CONTENT_SMS);
        Cursor cur = context.getContentResolver().query(uriSMSURI, null, null, null, null);

        if (cur.moveToNext())
        {
            String message_id = cur.getString(cur.getColumnIndex("_id"));
            String type = cur.getString(cur.getColumnIndex("type"));
            String numeroTelephone=cur.getString(cur.getColumnIndex("address")).trim();

            if (numeroTelephone.equals(phoneNumberBlocked))
            {
                if (cur.getString(cur.getColumnIndex("type")).equals("6"))
                {                       
                    ContentValues values = new ContentValues();
                    values.put("type", "5");
                    context.getContentResolver().update(uriSMSURI,values,"_id= "+message_id,null);                          
                }
                else if(cur.getString(cur.getColumnIndex("type")).equals("5"))
                {                           context.getContentResolver().delete(uriSMSURI,"_id=?",new String[] { message_id});                      
                }
            }
        }
    }

    @Override
    public boolean deliverSelfNotifications()
    {
        return false;
    }
}

@Override
public void onCreate()
{
    MyContentObserver contentObserver = new MyContentObserver(getApplicationContext());
    ContentResolver contentResolver = getBaseContext().getContentResolver();
    contentResolver.registerContentObserver(Uri.parse(CONTENT_SMS), true, contentObserver);

}

}

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

Answer 2

You cannot block the Outgoing SMS from the default Message application because there is no Broadcast for Outgoing Text Messages.

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