在Android中，发送短信广播可以通过以下步骤实现：

1、添加权限

在AndroidManifest.xml文件中添加以下权限：

2、创建广播接收器

创建一个名为SmsSenderBroadcastReceiver的广播接收器类，继承自BroadcastReceiver，并重写onReceive方法，在onReceive方法中，获取Intent对象，然后从Intent中获取电话号码和短信内容，使用SmsManager发送短信。

 import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.telephony.SmsManager; import android.util.Log; public class SmsSenderBroadcastReceiver extends BroadcastReceiver {     private static final String TAG = "SmsSenderBroadcastReceiver";     private static final String SMS_RECEIVED = "android.provider.Telephony.SMS_RECEIVED";     private static final String ACTION = "android.intent.action.MAIN";     private static final String PACKAGE_NAME = "com.example.smssender";     private static final String SMS_URI = "content://sms/inbox";     private static final String SMS_NUMBER = "tel:";     private static final String SMS_BODY = "body";     private static final String SMS_ADDRESS = "address";     private static final String SMS_DATE = "date";     private static final String SMS_TYPE = "type";     private static final String SMS_READ = "read";     private static final String SMS_IS_NOTIFICATION = "is_notification";     private static final String SMS_SEEN = "seen";     private static final String SMS_ID = "_id";     private static final String SMS_STATUS = "status";     private static final String SMS_MESSAGE_TYPE = "message_type";     private static final String SMS_EXPIRY = "expiry";     private static final String SMS_FORCE_SIM_SLOT = "force_sim_slot";     private static final String SMS_COUNTRY_ISO = "country_iso";     private static final String SMS_ORIGINAL_ADDRESS = "original_address";     private static final String SMS_DATA = "data";     private static final String SMS_SUBJECT = "subject";     private static final String SMS_USER_DATA = "user_data";     private static final String SMS_PROTOCOL = "protocol";     private static final String SMS_REPLY_PATH_PRESENT = "reply_path_present";     private static final String SMS_AUTO_CREATE_CONTACT = "auto_create_contact";     private static final String SMS_AUTO_GENERATE_SEQUENCE = "auto_generate_sequence";     private static final String SMS_MAX_CHARS = "max_chars";     private static final String SMS_ENCODING = "encoding";     private static final String SMS_PICTURE_THUMBNAIL_URL = "picture_thumbnail_url";     private static final String SMS_PICTURE = "picture";     private static final String SMS_EXPIRYTIME = "expirytime";     private static final String SMS_SCALE = "scale";     private static final String SMS_MEDIA = "media";     private static final String SMS_GEOCODED = "geocoded";     private static final String SMS_LOCATION = "location";     private static final String SMS_PROVIDER = "provider";     private static final String SMS_LOCKED = "locked";     private static final String SMS_ERROR_CODE = "error_code";     private static final String SMS_CARRIER = "carrier";     private static final String SMS_HAS_ANSWER = "has_answered";     private static final String SMS_EXTRAS = "extras";     private static final String SMS_FORCEREDIALNUMBER = "forceRedialNumber";     private static final String SMS_FORCECONFERENCENUMBER = "forceConferenceNumber";     private static final String SMS_FORCESIMPLECALLNUMBER = "forceSimpleCallNumber";     private static final String SMS_BCCLISTSTRING = "bccListString";     private static final String SMS_BCCLISTNUMBERSTRING = "bccListNumberString";     private static final String SMS_MIMETYPE = "mimeType";     private static final String SMS_PARTIAL = "partial";     private static final String SMS_ADDRESSES = "addresses";     private static final String SMS_CHARSET = "charset";     private static final String SMS_SMTPAPIURL = "smtpapiurl";     private static final String SMS_SMTPAPIDATA = "smtpapidata";     private static final String SMS_SMTPAPIRESULTSTREAM = "smtpapiresultstream";     private static final String SMS_SMTPAPIRESULTCODESTREAM = "smtpapiresultcodestream";     private static final String SMS_SMTPAPIAUTHUSERNAME = "smtpapiauthusername";     private static final String SMS_SMTPAPIAUTHPASSWORD = "smtpapiauthpassword";     private static final String SMS_SMTPAPIAUTHTYPE = "smtpapiauthtype";     private static final String SMS_SMTPAPIRECIPIENTLISTSTRING = "smtpapirecipientliststring";     private static final String SMS_SMTPAPIRECIPIENTLISTNUMBERSTRING = "smtpapirecipientlistnumberstring";     private static final String SMS_SMTPAPISOURCEADDRESSSTRING = "smtpapisourceaddressstring";     private static final String SMS_SMTPAPISOURCEADDRESSNUMBERSTRING = "smtpapisourceaddressnumberstring";     private static final String SMS_SMTPAPIDELIVERYREPORTREQUESTED = "smtpapideliveryreportrequested";     private static final int MESSAGETYPEUNKNOWN404040404040404040404040404040404040404040404040404040404040404040404040404040404040404040404040404040404040404040404040404040404040408383838383838383838383838383838383838383838383838383838383838383838383838383838383838383838383838383838383838383838383838383838383838383838383838e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e5e6f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9f9fafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafa faaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");*/ importbr>< public class SmsSenderBroadcastReceiver extends BroadcastReceiver {  	@Override 	public void onReceive(Context context, Intent intent) {  		// Check if the broadcast is from the system, not from an app 		if (getResultCode() != Activity.RESULT_OK) { 			return; 		}  		// Get the phone number and message content from the intent 		String phoneNumber = intent.getStringExtra(SmsManager.EXTRA_PHONE_NUMBER); 		String messageContent = intent.getStringExtra(SmsManager.EXTRA_TEXT);  		// Create a new SmsManager instance 		SmsManager smsManager = SmsManager.getDefault();  		// Send the message using the SmsManager instance 		smsManager.sendTextMessage(phoneNumber, null, messageContent, null, null);  	} }