public class MainActivity extends Activity {

     private Handler handler = new Handler(){

         @Override

         public void handleMessage(Message msg) {

             switch (msg.what){

                 case :

                     Log.i("====","执行了");

                     //需要执行的代码放这里

                     break;

             }

         }

     };

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         TimerTask task = new TimerTask() {

             @Override

             public void run() {

                 handler.sendEmptyMessage();

             }

         };

         Timer timer = new Timer(true);

         timer.schedule(task,strToDateLong("2016-06-14 15:33:30"));

     }

     /**

      * string类型时间转换为date

      * @param strDate

      * @return

      */

     public static Date strToDateLong(String strDate) {

         SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

         ParsePosition pos = new ParsePosition();

         Date strtodate = formatter.parse(strDate, pos);

         return strtodate;

     }

 }