public class MainActivity extends Activity {
  List<Message> smsList;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    smsList = new ArrayList<Message>();
  }
  public void click(View v){
    //访问内容提供者获取短信
    ContentResolver cr = getContentResolver();
    //            短信内容提供者的主机名
    Cursor cursor = cr.query(Uri.parse("content://sms"), new String[]{"address", "date", "body", "type"}, 
        null, null, null);
    while(cursor.moveToNext()){
      String address = cursor.getString(0);
      long date = cursor.getLong(1);
      String body = cursor.getString(2);
      String type = cursor.getString(3);
      Message sms = new Message(body, type, address, date);
      smsList.add(sms);
      Log.e("TAG", sms.toString());
    }
  }
  public void click2(View v){
    XmlSerializer xs = Xml.newSerializer();
    File file = new File("sdcard/sms.xml");
    FileOutputStream fos;
    try {
      fos = new FileOutputStream(file);
      xs.setOutput(fos, "utf-8");
      xs.startDocument("utf-8", true);
      xs.startTag(null, "message");
      for (Message sms : smsList) {
        xs.startTag(null, "sms");
        xs.startTag(null, "body");
        xs.text(sms.getBody());
        xs.endTag(null, "body");
        xs.startTag(null, "date");
        xs.text(sms.getDate() + "");
        xs.endTag(null, "date");
        xs.startTag(null, "type");
        xs.text(sms.getType());
        xs.endTag(null, "type");
        xs.startTag(null, "address");
        xs.text(sms.getAddress());
        xs.endTag(null, "address");
        xs.endTag(null, "sms");
      }
      xs.endTag(null, "message");
      xs.endDocument();
    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  }
} 

<uses-permission android:name="android.permission.READ_SMS"/>
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 

public class MainActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
  }
  public void click(View v){
    Thread t = new Thread(){
      @Override
      public void run() {
        ContentResolver cr = getContentResolver();
        ContentValues values = new ContentValues();
        values.put("address", 95533);
        values.put("type", 1);
        values.put("date", System.currentTimeMillis());
        values.put("body", "您尾号为9999的信用卡收到1,000,000RMB转账，请注意查收");
        cr.insert(Uri.parse("content://sms"), values);
      }
    };
    t.start();
  }
}