<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical"

    >

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="@string/number" />

    <EditText

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:hint="@null"

        android:id="@+id/number2"

        />

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/content" />

    <EditText

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:minLines="3"

        android:id="@+id/content"

        android:hint="@null"

        />

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/button"

        android:id="@+id/button"

        />

</LinearLayout>

package com.example.sms;

import java.util.ArrayList;

import android.app.Activity;

import android.os.Bundle;

import android.telephony.gsm.SmsManager;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

public class MainActivity extends Activity {

    EditText numberText;

    EditText contentText;

    Button button;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        numberText = (EditText)this.findViewById(R.id.number2);

        contentText = (EditText)this.findViewById(R.id.content);

        button = (Button)this.findViewById(R.id.button);

        button.setOnClickListener(new ButtonClickListener());    

    }

    private final class ButtonClickListener implements View.OnClickListener{

        @SuppressWarnings("deprecation")

        @Override

        public void onClick(View v) {

            // TODO 自动生成的方法存根

            String number = numberText.getText().toString();

            String content = contentText.getText().toString();

            SmsManager manager = SmsManager.getDefault();

            //如果短信过长，可以自动拆分，如果字数超过70,需拆分成多条短信发送

            ArrayList<String> texts = manager.divideMessage(content);

            for(String text : texts)

            {

                //发送短信指令

                manager.sendTextMessage(number, null, text, null, null);

                //最后第二个参数为短信已发送的广播意图,最后一个参数为短信对方已收到短信的广播意图

            }

            //显示发送成功

            Toast.makeText(MainActivity.this, R.string.success, Toast.LENGTH_LONG).show();

        }

    }

}

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <string name="app_name">sms</string>

    <string name="hello_world">Hello world!</string>

    <string name="number">请输入手机号：</string>

    <string name="content">请输入内容：</string>

    <string name="button">发送</string>

    <string name="success">发送成功</string>

</resources>