Add SMS gateway to your android application

There are many websites or companies who provide an API to allow you to send a humongous amount of SMS from your application. Today, I will give you an overview of how to do it with an example.

Step 1:

Get an sms API from this website: https://www.textlocal.in/

• First, sign up on this website.
• Copy your API key.

Step 2:

Make an android project and add two edit text in your xml file to get mobile number and message that needs to be sent.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/number"
        android:inputType="number"
        android:maxLines="1"
        android:hint="Mobile Number"
        android:padding="10dp"/>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/message"
        android:inputType="text"
        android:maxLines="1"
        android:hint="Message"
        android:padding="10dp"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="SEND"
        android:textColor="@color/colorPrimary"
        android:id="@+id/send"
        android:padding="10dp"/>

</LinearLayout>

MainActivity.java

private EditText number;
private EditText message;
private Button send;

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

    number = (EditText)findViewById(R.id.number);
    message = (EditText)findViewById(R.id.message);
    send = (Button)findViewById(R.id.send);

    send.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            String num = number.getText().toString();
            String msg = message.getText().toString();

            if(num.length() == 10){
                if(!TextUtils.isEmpty(num) && !TextUtils.isEmpty(msg)){

                    snms_sender hn = new snms_sender(num,msg);
                    hn.execute();

                }else{
                    Toast.makeText(MainActivity.this, "Please input all the feilds.", Toast.LENGTH_SHORT).show();
                }
            }else{
                Toast.makeText(MainActivity.this, "Please enter a correct number.", Toast.LENGTH_SHORT).show();
            }

        }
    });
}

Now, the layout is done. We will have to make a class which will connect to API and send sms.

sms_sender.java

snms_sender extends AsyncTask<String, String, String> {

    public String num;
    public String msg;

    public snms_sender(String num,String msg){
        this.num = num;
        this.msg = msg;
    }

    @Override
    protected String doInBackground(String... strings) {
        try {
            // Construct data
            String apiKey = "apikey=" + "0QF1KAyJPU0-ah0j81MddpJBrtO4WsOmDoPCnUrEu4";
            String message = "&message=" + msg;
            String sender = "&sender=" + "TXTLCL";
            String numbers = "&numbers=" + "91" + num;

            // Send data
            HttpURLConnection conn = (HttpURLConnection) new URL("https://api.textlocal.in/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);
            }
            rd.close();

            return stringBuffer.toString();
        } catch (Exception e) {
            System.out.println("Error SMS "+e);
            return "Error "+e;
        }
    }
}

Now, you are ready to send SMS with your application.

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