安卓實現群發簡訊：

1.首先獲取到即將要群發的聯絡人的集合：

private List<UploadContactBean> selectContactList = new ArrayList<>();

2.群發簡訊：

public void sendGroupMessage(String value) {
    for (UploadContactBean uploadContactBean : selectContactList) {
        Intent deliverIntent = new Intent(SENT_SMS_ACTION);
        PendingIntent deliverPI = PendingIntent.getBroadcast(this, 0, deliverIntent, 0);
        SmsManager smsManager = SmsManager.getDefault();
        List<String> divideContents = smsManager.divideMessage(value);
        for (String text : divideContents) {
            LogUtils.d("MainActivity   uploadContactBean.getPhoneNumber() = " + uploadContactBean.getPhoneNumber() + "  text = " + text);
            smsManager.sendTextMessage(uploadContactBean.getPhoneNumber(), null, text, null, deliverPI);
        }
        ToastHelper.showShortMessage("Send group message success");
    }
}

需要的許可權：

<uses-permission android:name="android.permission.READ_CONTACTS"/>
<uses-permission android:name="android.permission.WRITE_CONTACTS"/>
<uses-permission android:name="android.permission.GET_ACCOUNTS"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.SEND_SMS" />

常用到的相關方法：

/**
 * 打電話
 *
 * @param tel 電話號碼
 */
private void callPhone1(String tel) {
    Intent intent = new Intent(Intent.ACTION_DIAL);
    intent.setData(Uri.parse("tel:" + tel));
    startActivity(intent);
}

/**
 * 打電話
 *
 * @param tel 電話號碼
 */
@SuppressLint("MissingPermission")
private void callPhone2(String tel) {
    Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + tel));
    startActivity(intent);
}

/**
 * 傳送簡訊
 *
 * @param tel     電話號碼
 * @param content 短息內容
 */
private void sendMessage1(String tel, String content) {
    Intent sendIntent = new Intent(SENT_SMS_ACTION);
    PendingIntent sendPI = PendingIntent.getBroadcast(this, 0, sendIntent, 0);

    SmsManager smsManager = SmsManager.getDefault();
    List<String> divideContents = smsManager.divideMessage(content);
    for (String text : divideContents) {
        smsManager.sendTextMessage(tel, null, text, sendPI, null);
    }
}

/**
 * 傳送簡訊
 *
 * @param tel     電話號碼
 * @param content 短息內容
 */
private void sendMessage2(String tel, String content) {
    Intent deliverIntent = new Intent(DELIVERED_SMS_ACTION);
    PendingIntent deliverPI = PendingIntent.getBroadcast(this, 0, deliverIntent, 0);

    SmsManager smsManager = SmsManager.getDefault();
    List<String> divideContents = smsManager.divideMessage(content);
    for (String text : divideContents) {
        smsManager.sendTextMessage(tel, null, text, null, deliverPI);
    }
}

/**
 * 傳送簡訊(掉起發簡訊頁面)
 *
 * @param tel     電話號碼
 * @param content 短息內容
 */
private void sendMessage3(String tel, String content) {
    if (PhoneNumberUtils.isGlobalPhoneNumber(tel)) {
        Intent intent = new Intent(Intent.ACTION_SENDTO, Uri.parse("smsto:" + tel));
        intent.putExtra("sms_body", content);
        startActivity(intent);
    }
}

Demo 地址：https://github.com/HuaDanJson/AndroidGetContacts