我如何在android studio中发送私人字符串短信？

Question

我正在做一个类似跌落探测器的android项目，现在我被卡在短信部分，任何人都可以告诉我当加速度计检测到震动时我如何自动发送紧急短信到选定的联系人，我的意思是说每当吐司出现＆＃34;检测到跌倒＆＃34;短信＆＃34;帮助我＆＃34;将自动发送给选定的联系人。

public class MyService extends Service implements SensorEventListener {

    public MyService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        throw new UnsupportedOperationException("Not yet implemented");
    }

    int count = 1;
    private boolean init;
    private Sensor mySensor;
    private SensorManager SM;
    private float x1, x2, x3;
    private static final float ERROR = (float) 7.0;
    private static final float SHAKE_THRESHOLD = 15.00f; // m/S**2
    private static final int MIN_TIME_BETWEEN_SHAKES_MILLISECS = 1000;
    private long mLastShakeTime;
    private TextView counter;

    @Override
    public void onCreate() {

    }

    @Override


    public void onSensorChanged(SensorEvent event) {
        if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
            long curTime = System.currentTimeMillis();
            if ((curTime - mLastShakeTime) > MIN_TIME_BETWEEN_SHAKES_MILLISECS) {

                float x = event.values[0];
                float y = event.values[1];
                float z = event.values[2];

                double acceleration = Math.sqrt(Math.pow(x, 2) +
                        Math.pow(y, 2) +
                        Math.pow(z, 2)) - SensorManager.GRAVITY_EARTH;
                Log.d("mySensor", "Acceleration is " + acceleration + "m/s^2");

                if (acceleration > SHAKE_THRESHOLD) {
                    mLastShakeTime = curTime;
                    Toast.makeText(getApplicationContext(), "FALL DETECTED",
                            Toast.LENGTH_LONG).show();
                }
            }
        }
    }


    public int onStartCommand(Intent intent, int flags, int startId) {
        Toast.makeText(this, "Start Detecting", Toast.LENGTH_LONG).show();
        SM = (SensorManager) getSystemService(SENSOR_SERVICE);
        mySensor = SM.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        SM.registerListener(this, mySensor, SensorManager.SENSOR_DELAY_NORMAL);

        //here u should make your service foreground so it will keep working even if app closed


        return Service.START_STICKY;

    }


    @Override
    public void onDestroy() {
        Toast.makeText(this, "Stop Detecting", Toast.LENGTH_LONG).show();

    }

    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        //Noting to do!!
    }

    //Register the Listener when the Activity is resumed
}

这个用于保存联系人：

public class Main22Activity extends AppCompatActivity {
    EditText nameInput,phoneInput;
    TextView LargeText;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main22);
        nameInput = (EditText) findViewById(R.id.nameInput);
        phoneInput = (EditText) findViewById(R.id.phoneInput);

        LargeText = (TextView) findViewById(R.id.textView2);
    }

    public void saveInfo (View view){
        SharedPreferences sharedPref = getSharedPreferences("nameInfo" , Context.MODE_PRIVATE);
        SharedPreferences.Editor editor= sharedPref.edit();
        editor.putString("name", nameInput.getText().toString());
        editor.putString("phone", phoneInput.getText().toString());
        editor.apply();
        Toast.makeText(this, "Saved", Toast.LENGTH_LONG).show();
    }

    public void displayData(View view){
        SharedPreferences sharedPref = getSharedPreferences("nameInfo" , Context.MODE_PRIVATE);
        String name = sharedPref.getString("name", "");
        String ph = sharedPref.getString ("phone","");
        LargeText.setText(name + " " + ph);
    }
}