黑马Android:短信发送器

public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }   public void send(View v){       //拿到用用户输入的号码和内容       EditText et_phone = (EditText) findViewById(R.id.et_phone);       EditText et_content = (EditText) findViewById(R.id.et_content);       String phone = et_phone.getText().toString();       String content = et_content.getText().toString();       //1.获取短信管理器       SmsManager sm = SmsManager.getDefault();       //2.切割短信，把长短信分成若干个小短信       ArrayList<String> smss = sm.divideMessage(content);       //3.for循环把集合中所有短信全部发送出去       for(String string : smss){           sm.sendTextMessage(phone, null, string, null, null);       }   }}

<!--添加权限--> <uses-permission android:name="android.permission.SEND_SMS"/>

<!--布局文件--><LinearLayout 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="indi.cc.smssender.MainActivity"     android:orientation="vertical"    >    <EditText         android:id="@+id/et_phone"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:inputType="phone"        android:hint="请输入对方号码"        />    <EditText         android:id="@+id/et_content"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:lines="5"        android:hint="请输入短信内容"        android:gravity="top"        />    <Button         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="发送"        android:onClick="send"        /></LinearLayout>

界面显示