public class ScreenTestActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
SmsContent content = new SmsContent(new Handler());
// 注册短信变化监听
this.getContentResolver().registerContentObserver(
Uri.parse("content://sms/"), true, content);

}

class SmsContent extends ContentObserver {
private Cursor cursor = null;

public SmsContent(Handler handler) {
super(handler);
}

/**
* @Description 当短信表发送改变时，调用该方法 需要两种权限 android.permission.READ_SMS读取短信
* android.permission.WRITE_SMS写短信
* @Author Snake
* @Date 2010-1-12
*/
@Override
public void onChange(boolean selfChange) {
// TODO Auto-generated method stub
super.onChange(selfChange);
// 读取收件箱中指定号码的短信
cursor = managedQuery(Uri.parse("content://sms/inbox"),
new String[] { "_id", "address", "read" },
" address=? and read=?",
new String[] { "15555215556", "0" }, "date desc");

if (cursor != null) {
ContentValues values = new ContentValues();
values.put("read", "1"); // 修改短信为已读模式
cursor.moveToFirst();
while (cursor.isLast()) {
// 更新当前未读短信状态为已读
getContentResolver().update(
Uri.parse("content://sms/inbox"), values, " _id=?",
new String[] { "" + cursor.getInt(0) });
//getContentResolver().delete(Uri.parse("content://sms/inbox"), " _id=?", new String[] { "" + cursor.getInt(0) }); 
cursor.moveToNext();
}
}
}
}

}