发送短信代码 注意加权限

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出去    for (String string : smss) {    sm.sendTextMessage(phone, null, string, null, null);}    }    }