use the permission on AndroidManifest.xml as:
Video:
<uses-permission android:name="android.permission.SEND_SMS"></uses-permission>
Write the following Code in MainActivity.java section:
import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.text.TextUtils; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.telephony.SmsManager; import android.widget.Toast; public class MainActivity extends AppCompatActivity { Button send; EditText phone, message; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); send=(Button)findViewById(R.id.btnsend); phone = (EditText)findViewById(R.id.txtPhone); message=(EditText)findViewById(R.id.txtMessage); send.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { sendmessage(); } }); } public void sendmessage(){ String number= phone.getText().toString().trim(); String mess= message.getText().toString().trim(); if(number==null || number.equals("")||mess==null|| mess.equals("")){ Toast.makeText(this,"field can't be empty",Toast.LENGTH_LONG).show(); } else { if(TextUtils.isDigitsOnly(number)){ SmsManager smsManager = SmsManager.getDefault(); smsManager.sendTextMessage(number,null,mess,null,null); Toast.makeText(this,"message send successfully" +number,Toast.LENGTH_LONG).show(); } else { Toast.makeText(this,"please enter integer only",Toast.LENGTH_LONG).show(); } } } }See the designing part in the video.
Video:
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