首先 activity_main.xml 布局：

<RelativeLayout xmlns:android="/apk/res/android"
xmlns:tools="/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".SmsActivity" >

<TextView
android:id="@+id/phone_lable"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="23dp"
android:text="@string/phon_lable" />

<EditText
android:id="@+id/edit_phone"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/phone_lable"
android:layout_centerHorizontal="true"
android:ems="10"

android:inputType="phone" >

</EditText>

<TextView
android:id="@+id/sms_lable"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/edit_phone"
android:layout_below="@+id/edit_phone"
android:layout_marginTop="22dp"
android:text="@string/sms_lable" />

<Button
android:id="@+id/But_sms"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/edit_sms"
android:layout_alignParentBottom="true"
android:layout_marginBottom="14dp"
android:text="@string/But_sms" />

<EditText
android:id="@+id/edit_sms"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="@+id/But_sms"
android:layout_alignLeft="@+id/sms_lable"
android:ems="10"
android:inputType="textMultiLine" />

</RelativeLayout>

然后在AndroidManifest.xml 中添加 发送短信的权限：
<uses-permission android:name="android.permission.SEND_SMS"/>

接下来就是SmsActivity 中 主要代码 的实现 其功能 ：

public class SmsActivity extends Activity {

// 声明控件对象
private Button butten_sms;
private EditText edit_phone;
private EditText edit_sms;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//设置显示视图
setContentView(yout.activity_sms);

//获取按钮组件
butten_sms=(Button) findViewById(R.id.But_sms);

//获取输入框组件
edit_phone = (EditText) findViewById(R.id.edit_phone);

edit_sms = (EditText) findViewById(R.id.edit_sms);

//注册按钮事件
butten_sms.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {
/**
* 发彩信
*/
//获取电话号
String phone_num = edit_phone.getText().toString();

//创建意图对象
Intent intent = new Intent(Intent.ACTION_SEND);
intent.putExtra(Intent.EXTRA_STREAM, Uri.parse("file:///sdcard/a.jpg"));
intent.putExtra("address", phone_num);
intent.putExtra("exit_on_sent", true);
intent.putExtra("subject", "subject:I love you");
intent.putExtra("sms_body", "content ::XXXX");
intent.setType("image/jpeg");

startActivity(intent);

/*// 获取短信管理器对象
SmsManager smsManager = SmsManager.getDefault();
// 意图对象
PendingIntent pendingIntent = PendingIntent.getBroadcast(
SmsActivity.this, 0, new Intent(), 0);*/

}
});
}


//发短信 功能
public void send(){
//获取号码
String phone_Num = edit_phone.getText().toString();

//获取发送的短信
String phone_sms = edit_sms.getText().toString();

//获取信息管理器对象
SmsManager smsmanager = SmsManager.getDefault();

//意图对象
PendingIntent pendingIntent = PendingIntent.getBroadcast(SmsActivity.this, 0, new Intent(), 0);

//判断 信息长度 大于 70则分两条发送。。默认是70
ArrayList<String> contents = smsmanager
.divideMessage(phone_sms);
for (String c : contents) {
// 发送信息的操作
smsmanager.sendTextMessage(phone_Num, null, c,
pendingIntent, null);
}

/*//发送信息操作
smsmanager.sendTextMessage(phone_Num, null, phone_sms, pendingIntent, null);*/

//吐司的效果
Toast.makeText(SmsActivity.this, "短信发送成功",Toast.LENGTH_LONG).show();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.sms, menu);
return true;
}

}