<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.msgSend.MainActivity"
    tools:ignore="MergeRootFrame" >

    <TextView
        android:id="@+id/tv_pleaseInputPhoneNum"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/pleaseInputPhoneNum" />

    <EditText
        android:id="@+id/et_phoneNum"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/tv_pleaseInputPhoneNum"
        android:layout_marginTop="14dp"
        android:ems="10"
        android:inputType="phone" />

    <TextView
        android:id="@+id/et_pleaseInputContent"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/et_phoneNum"
        android:layout_marginTop="16dp"
        android:text="@string/pleaseinputcontent" />

    <EditText
        android:id="@+id/et_content"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/et_pleaseInputContent"
        android:layout_marginTop="26dp"
        android:layout_marginRight="10dp"
        android:layout_marginLeft="10dp"
        android:ems="10"
        android:lines="5" >

    </EditText>

    <Button
        android:id="@+id/bt_send"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/et_content"
        android:layout_below="@+id/et_content"
        android:layout_marginTop="26dp"
        android:text="@string/send" />

</RelativeLayout>

package com.example.msgSend;

import java.util.List;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.telephony.SmsManager;
import android.text.TextUtils;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity implements OnClickListener{
	
	/** 电话号码 */
	private EditText etPhoneNum;
	
	/** 短信内容 */
	private EditText etContent;

	/** 发送按钮 */
	private Button btSend;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		//获得组件
		etPhoneNum = (EditText)findViewById(R.id.et_phoneNum);
		etContent = (EditText)findViewById(R.id.et_content);
		btSend = (Button)findViewById(R.id.bt_send);
		System.out.println("获取成功");
		
		//注册点击事件
		btSend.setOnClickListener(this);
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.bt_send:
			sendMessage();
			break;
		default:
			break;
		}
		
	}
	//实现短信发送
	private void sendMessage() {
		String phoneNum = etPhoneNum.getText().toString();
		String content = etContent.getText().toString();
		
		//吐司提示
		if (TextUtils.isEmpty(phoneNum) || TextUtils.isEmpty(content)) {
			Toast.makeText(this, "手机号码和短信都不能为空", Toast.LENGTH_LONG).show();
			return ;
		}
		
		SmsManager smsManager = SmsManager.getDefault();
		//短信是有长度限制的， 直接对内容进行分割
		List<String> contents = smsManager.divideMessage(content);
		//发送
		for (String content1 : contents) {
			smsManager.sendTextMessage(phoneNum, null, content1, null, null);
		}
	}

}