Le Tutoriel de Android SMS

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

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.o7planning.smsmanagerexample">

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    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"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="20dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:text="Phone Number"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editText_phoneNumber"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:ems="10"
        android:hint="Phone Number"
        android:inputType="phone"
        android:text="+15555215554"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:text="Message:"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText_phoneNumber" />

    <EditText
        android:id="@+id/editText_message"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:ems="10"
        android:inputType="text"
        android:text="Hello, How are you?"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView2" />

    <Button
        android:id="@+id/button_send"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="Send By SmsManager"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText_message" />

</androidx.constraintlayout.widget.ConstraintLayout>

package org.o7planning.smsmanagerexample;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
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.Toast;

public class MainActivity extends AppCompatActivity {

    private static final int MY_PERMISSION_REQUEST_CODE_SEND_SMS = 1;

    private static final String LOG_TAG = "AndroidExample";

    private EditText editTextPhoneNumber;
    private EditText editTextMessage;

    private Button buttonSend;

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

        this.editTextPhoneNumber = (EditText) this.findViewById(R.id.editText_phoneNumber);
        this.editTextMessage = (EditText) this.findViewById(R.id.editText_message);

        this.buttonSend = (Button) this.findViewById(R.id.button_send);

        this.buttonSend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                askPermissionAndSendSMS();
            }
        });
    }

    private void askPermissionAndSendSMS() {

        // With Android Level >= 23, you have to ask the user
        // for permission to send SMS.
        if (android.os.Build.VERSION.SDK_INT >=  android.os.Build.VERSION_CODES.M) { // 23

            // Check if we have send SMS permission
            int sendSmsPermisson = ActivityCompat.checkSelfPermission(this,
                    Manifest.permission.SEND_SMS);

            if (sendSmsPermisson != PackageManager.PERMISSION_GRANTED) {
                // If don't have permission so prompt the user.
                this.requestPermissions(
                        new String[]{Manifest.permission.SEND_SMS},
                        MY_PERMISSION_REQUEST_CODE_SEND_SMS
                );
                return;
            }
        }
        this.sendSMS_by_smsManager();
    }

    private void sendSMS_by_smsManager()  {

        String phoneNumber = this.editTextPhoneNumber.getText().toString();
        String message = this.editTextMessage.getText().toString();

        try {
            // Get the default instance of the SmsManager
            SmsManager smsManager = SmsManager.getDefault();
            // Send Message
            smsManager.sendTextMessage(phoneNumber,
                    null,
                    message,
                    null,
                    null);

            Log.i( LOG_TAG,"Your sms has successfully sent!");
            Toast.makeText(getApplicationContext(),"Your sms has successfully sent!",
                    Toast.LENGTH_LONG).show();
        } catch (Exception ex) {
            Log.e( LOG_TAG,"Your sms has failed...", ex);
            Toast.makeText(getApplicationContext(),"Your sms has failed... " + ex.getMessage(),
                    Toast.LENGTH_LONG).show();
            ex.printStackTrace();
        }
    }


    // When you have the request results
    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {

        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        //
        switch (requestCode) {
            case MY_PERMISSION_REQUEST_CODE_SEND_SMS: {

                // Note: If request is cancelled, the result arrays are empty.
                // Permissions granted (SEND_SMS).
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    Log.i( LOG_TAG,"Permission granted!");
                    Toast.makeText(this, "Permission granted!", Toast.LENGTH_LONG).show();

                    this.sendSMS_by_smsManager();
                }
                // Cancelled or denied.
                else {
                    Log.i( LOG_TAG,"Permission denied!");
                    Toast.makeText(this, "Permission denied!", Toast.LENGTH_LONG).show();
                }
                break;
            }
        }
    }

    // When results returned
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == MY_PERMISSION_REQUEST_CODE_SEND_SMS) {
            if (resultCode == RESULT_OK) {
                // Do something with data (Result returned).
                Toast.makeText(this, "Action OK", Toast.LENGTH_LONG).show();
            } else if (resultCode == RESULT_CANCELED) {
                Toast.makeText(this, "Action canceled", Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(this, "Action Failed", Toast.LENGTH_LONG).show();
            }
        }
    }
}

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

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.o7planning.smsintentexample">

    <uses-permission android:name="android.permission.SEND_SMS"/>
    
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    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"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/textView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="20dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:text="Phone Number"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/editText_phoneNumber"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:ems="10"
        android:hint="Phone Number"
        android:inputType="phone"
        android:text="+15555215554"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:text="Message:"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText_phoneNumber" />

    <EditText
        android:id="@+id/editText_message"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:ems="10"
        android:inputType="text"
        android:text="Hello, How are you?"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView2" />

    <Button
        android:id="@+id/button_send"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="Send By Intent.ACTION_SEND"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText_message" />

</androidx.constraintlayout.widget.ConstraintLayout>

package org.o7planning.smsintentexample;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private static final String LOG_TAG = "AndroidExample";

    private EditText editTextPhoneNumber;
    private EditText editTextMessage;

    private Button buttonSend;

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

        this.editTextPhoneNumber = (EditText) this.findViewById(R.id.editText_phoneNumber);
        this.editTextMessage = (EditText) this.findViewById(R.id.editText_message);

        this.buttonSend = (Button) this.findViewById(R.id.button_send);

        this.buttonSend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sendSMS_by_Intent_ACTION_SEND();
            }
        });
    }

    private void sendSMS_by_Intent_ACTION_SEND()  {
        String phoneNumber = this.editTextPhoneNumber.getText().toString();
        String message =  this.editTextMessage.getText().toString();

        // Add the phone number in the data
        Uri uri = Uri.parse("smsto:" + phoneNumber);

        Intent smsIntent = new Intent(Intent.ACTION_SENDTO, uri);
        // Add the message at the sms_body extra field
        smsIntent.putExtra("sms_body", message);
        try {
            startActivity(smsIntent);
        } catch (Exception ex) {
            Log.e(LOG_TAG, "Your sms has failed... " + ex.getMessage(), ex);
            Toast.makeText(MainActivity.this, "Your sms has failed... " + ex.getMessage(),
                    Toast.LENGTH_LONG).show();
            ex.printStackTrace();
        }
    }
}