public class PowerTool extends Activity implements OnClickListener{ 
          
         private TextView mTimeDisplay; 
     private DBAdapter mDbHelper; 
     private int mRowId; 
      
     /** Called when the activity is first created. */ 
     @Override 
     public void onCreate(Bundle savedInstanceState) { 
         super.onCreate(savedInstanceState); 
         setContentView(R.layout.main); 
        
         mDbHelper = new DBAdapter(this); 
         mDbHelper.open(); 
         mRowId = -1; 
         
         int hour = 03; 
         int minute = 20; 
          
         Cursor timesCursor = mDbHelper.fetchAllTimes(); 
         //startManagingCursor(timesCursor); 
         if (timesCursor.getCount() != 0){ 
                 timesCursor.moveToFirst(); 
                 mRowId = timesCursor.getInt( timesCursor.getColumnIndexOrThrow(DBAdapter.KEY_ROWID)); 
                 hour = timesCursor.getInt( timesCursor.getColumnIndexOrThrow(DBAdapter.KEY_HOUR)); 
                 minute = timesCursor.getInt( timesCursor.getColumnIndexOrThrow(DBAdapter.KEY_MINUTE)); 
                  
             AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE); 
             Shutdown st = new Shutdown(this,am); 
                 st.SetPoweroffSchedule(hour,minute);
         } 
          
         mTimeDisplay = (TextView) findViewById(R.id.TextView);    
  
         TimePicker timePicker = (TimePicker) findViewById(R.id.TimePicker); 
         timePicker.setIs24HourView(true); 
         timePicker.setCurrentHour(hour); 
         timePicker.setCurrentMinute(minute); 
          
         timePicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() { 
             public void onTimeChanged(TimePicker view, int hourOfDay, int minute) { 
                 updateDisplay(hourOfDay, minute); 
             } 
         }); 
          
         Button btnOK = (Button) findViewById(R.id.btnOK);  
         btnOK.setOnClickListener(mSetSchedule);  
         
         InputMethodManager imm =  
          (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); 
              imm.hideSoftInputFromWindow(timePicker.getWindowToken(), 0); 
     } 
  
     private OnClickListener mSetSchedule = new OnClickListener() { 
         public void onClick(View v) { 
             TimePicker timePicker = (TimePicker) findViewById(R.id.TimePicker); 
             
             InputMethodManager in = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE); 
             in.hideSoftInputFromWindow(timePicker.getApplicationWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS); 
              
             int hour = timePicker.getCurrentHour(); 
             int minute = timePicker.getCurrentMinute(); 
              
             AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE); 
             Shutdown st = new Shutdown(PowerTool.this,am); 
             st.SetPoweroffSchedule(hour,minute); 
             
             getWindow().addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
             
             if(mRowId == -1){ 
                     mDbHelper.createTime(hour, minute); 
             }else { 
                     mDbHelper.updateTime(mRowId, hour, minute); 
             }
             InputMethodManager imm =  
              (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); 
                  imm.hideSoftInputFromWindow(timePicker.getWindowToken(), 0);
             finish();
         } 
         
     }; 
  
         private void updateDisplay(int hourOfDay, int minute) { 
         mTimeDisplay.setText( 
                     new StringBuilder() 
                     .append(pad(hourOfDay)).append(":") 
                     .append(pad(minute))); 
     } 
  
     private static String pad(int c) { 
         if (c >= 10) 
             return String.valueOf(c); 
         else 
             return "0" + String.valueOf(c); 
     }