首先，先创建一个安卓项目(我的版本号是4.4.2的)，名字为"短信发送器"

然后在res目录下找到layout目录，找到activity_main.xml或fragment_main.xml，在里面输入或拖拽button

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

    xmlns:tools="http://schemas.android.com/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="com.csdn.sms.MainActivity$PlaceholderFragment" >

    <TextView

        android:id="@+id/pl_input_number"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:text="@string/please_input_number"

        android:textAppearance="?android:attr/textAppearanceMedium" />

    <EditText

        android:id="@+id/input_number"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_below="@+id/pl_input_number"

        android:layout_marginTop="22dp"

        android:ems="10"

        android:inputType="phone" />

    <TextView

        android:id="@+id/pl_content"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/input_number"

        android:layout_below="@+id/input_number"

        android:layout_marginTop="47dp"

        android:text="@string/dx_content"

        android:textAppearance="?

android:attr/textAppearanceLarge" />

    <EditText

        android:id="@+id/content"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/pl_content"

        android:layout_below="@+id/pl_content"

        android:layout_marginTop="22dp"

        android:ems="10"

        android:inputType="textMultiLine" >

        <requestFocus />

    </EditText>

    <Button

        android:id="@+id/dx_send"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/content"

        android:layout_below="@+id/content"

        android:layout_marginTop="64dp"

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

</RelativeLayout>

最后在src下的java文件中MainActivity.java

package com.csdn.sms;

import java.util.ArrayList;

import android.app.Activity;

import android.os.Bundle;

import android.telephony.SmsManager;

import android.text.TextUtils;

import android.view.Menu;

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 Activity {

	private Button dx_send;

	private EditText dx_content, dx_number;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.fragment_main);

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

		dx_number = (EditText) this.findViewById(R.id.input_number);

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

		//第一种方法：通过点击事件来完毕

		dx_send.setOnClickListener(new OnClickListener() {

			@Override

			public void onClick(View v) {

				switch (v.getId()) {

				case R.id.dx_send:

					String content = dx_content.getText().toString().trim();

					String number = dx_number.getText().toString().trim();

					if (TextUtils.isEmpty(content) || TextUtils.isEmpty(number)) {

						Toast.makeText(MainActivity.this, "电话号码不能为空",

								Toast.LENGTH_SHORT).show();

						return;

					} else {

						// 短信管理器

						SmsManager smsManager = SmsManager.getDefault();

						// 假设超过字数限制，则自己主动拆分短信

						ArrayList<String> c = smsManager.divideMessage(content);

						for (String str : c) {

							smsManager.sendTextMessage(number, null, str, null,

									null);

						}

					}

					break;

				}

			}

		});

	}

	//另外一种：通过让该类实现 OnClickListener接口来重写方法完毕，和上面点击方法的内容是一样的

	@Override

	public boolean onCreateOptionsMenu(Menu menu) {

		getMenuInflater().inflate(R.menu.main, menu);

		return true;

	}

}

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