MainActivity.java Source code

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Here is the source code for MainActivity.java

Source

import android.Manifest;
import android.content.pm.PackageManager;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    final int SEND_SMS_PERMISSION_REQUEST_CODE = 1;
    Button mButtonSend;

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

        mButtonSend = (Button) findViewById(R.id.buttonSend);
        mButtonSend.setEnabled(false);

        if (checkPermission(Manifest.permission.SEND_SMS)) {
            mButtonSend.setEnabled(true);
        } else {
            ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.SEND_SMS },
                    SEND_SMS_PERMISSION_REQUEST_CODE);
        }
    }

    private boolean checkPermission(String permission) {
        int permissionCheck = ContextCompat.checkSelfPermission(this, permission);
        return (permissionCheck == PackageManager.PERMISSION_GRANTED);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
        case SEND_SMS_PERMISSION_REQUEST_CODE: {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                mButtonSend.setEnabled(true);
            }
            return;
        }
        }
    }

    public void send(View view) {
        String phoneNumber = ((EditText) findViewById(R.id.editTextNumber)).getText().toString();
        String msg = ((EditText) findViewById(R.id.editTextMsg)).getText().toString();

        if (phoneNumber == null || phoneNumber.length() == 0 || msg == null || msg.length() == 0) {
            return;
        }

        if (checkPermission(Manifest.permission.SEND_SMS)) {
            SmsManager smsManager = SmsManager.getDefault();
            if (msg.length() > 160) {
                ArrayList<String> messages = smsManager.divideMessage(msg);
                smsManager.sendMultipartTextMessage(phoneNumber, null, messages, null, null);
            } else {
                smsManager.sendTextMessage(phoneNumber, null, msg, null, null);
            }
        } else {
            Toast.makeText(MainActivity.this, "No Permission", Toast.LENGTH_SHORT).show();
        }
    }

}