How to Send Free SMS using Android?[With Source Code]

Steps:

1. Watch the video for the designing part:


2. Declare the EditText and Button on MainActivity.java file as:

EditText _txtapi, _txtmess, _txtsender, _txtnum;
Button _btnsend; 

3. Initialize  button and textfield inside the onCreate method as:

_txtapi = (EditText)findViewById(R.id.txtapi);
_txtmess=(EditText)findViewById(R.id.txtmess);
_txtsender=(EditText)findViewById(R.id.txtsender);
_txtnum=(EditText)findViewById(R.id.txtphone);
_btnsend=(Button)findViewById(R.id.btnsend);

4. Create the listening event of button and write the following code inside that listening event as:

       

 _btnsend.setOnClickListener(new View.OnClickListener() {
    @Override    public void onClick(View v) {
        try {
            // Construct data            String apiKey = "apikey=" + _txtapi.getText().toString();
            String message = "&message=" + _txtmess.getText().toString();
            String sender = "&sender=" + _txtsender.getText().toString();
            String numbers = "&numbers=" + _txtnum.getText().toString();

            // Send data            HttpURLConnection conn = (HttpURLConnection) new URL("https://api.txtlocal.com/send/?").openConnection();
            String data = apiKey + numbers + message + sender;
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Length", Integer.toString(data.length()));
            conn.getOutputStream().write(data.getBytes("UTF-8"));
            final BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            final StringBuffer stringBuffer = new StringBuffer();
            String line;
            while ((line = rd.readLine()) != null) {
                //stringBuffer.append(line);                Toast.makeText(getApplicationContext(), "the message is "+line, Toast.LENGTH_LONG).show();
            }
            rd.close();

            //return stringBuffer.toString();        } catch (Exception e) {
            //System.out.println("Error SMS "+e);            Toast.makeText(getApplicationContext(), "the error message is"+e, Toast.LENGTH_LONG).show();
            //return "Error "+e;        }
    }
});



       
 

5. Create the thread and write the above code inside that thread or strict the thread and write the following code inside the onCreate method but outsize the listening event of button.

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);

Video: