TableRow数据更新时加上高亮背景

    一般Table的数据(行)更新时，要配合一定的动画效果，才能引起用户注意。
    在Android里，颜色值用8位的16进制来表示，其中前两2位用来表示 alpha channel, 后6位用来表示rgb. 在程序里面，只要在指定时间内，将alpha channel从 0调整到 0xff,就实现了 highlight TableRow.

• 下面是用线程来实现:

class ColorRefreshTask extends TimerTask {
			final static int  DELAY_ONCE =200;
			final static int TOTAL_RUNTIME = 3000;
			final static int POWER_16_16 = 16 * 16* 16 * 16 * 16 * 16;
			final static int INCREASE_ONCE =  0xff / (TOTAL_RUNTIME / DELAY_ONCE);
			int color;
			int id;
			int startTime;
			int alphaChannel;
			
			/**
			 * 
			 * @param color (TableRow's current background color)
			 * @param id TableRow's id(user id)
			 */
			public ColorRefreshTask(int color, int id) {
				super();
				Log.d("color", "ready to set color!");
				this.color = color;
				this.id = id;
				this.startTime = 0;
				this.alphaChannel = 0;
			}
			
			public void run(){
				
				int colorComm = color -0xff000000;  //RGB color value;
				int currColor = color;
				
				if(startTime < TOTAL_RUNTIME) {
						startTime +=  DELAY_ONCE;
						alphaChannel +=  INCREASE_ONCE;
						currColor = POWER_16_16 *  alphaChannel  + colorComm;
						Log.d("color", Integer.toHexString(currColor));
						sendMsg(currColor);
						messageHandler.postDelayed(this,DELAY_ONCE);
						
				}
				else {
					sendMsg(currColor);
				}
				
			
			}
			
			public void startTimer(){
				  messageHandler.postDelayed(this,DELAY_ONCE);
			}
			
			
			private void sendMsg(int currColor){
				Message message = messageHandler.obtainMessage(); 
				message.what = MESSAGE_HANDLE_ID_UPDATEROW_BACKGROUND;
				Bundle bundle = new Bundle();
				bundle.putInt(MESSAGE_KEY_ID, id);
				bundle.putInt(MESSAGE_KEY_COLOR, currColor);
				message.setData(bundle);
				messageHandler.sendMessage(message);
			}
			
			public void stopTimer(){
				  this.cancel();
			}
			
			
	  }

• 消息处理部分:

 private static final int MESSAGE_HANDLE_ID = 800;
	  private static final int MESSAGE_HANDLE_ID_UPDATEROW_DATA = MESSAGE_HANDLE_ID + 1;
	  private static final int MESSAGE_HANDLE_ID_UPDATEROW_BACKGROUND = MESSAGE_HANDLE_ID +2;
	  private  Handler messageHandler = new Handler() {

		@Override
		public void handleMessage(Message msg) {
			
		switch(msg.what) {
			case  MESSAGE_HANDLE_ID_UPDATEROW_DATA:{
				int id = msg.getData().getInt(MESSAGE_KEY_ID);
				String fields[] = new String[5];
				fields[0] = msg.getData().getString("fields1");
				fields[1] = msg.getData().getString("fields2");
				fields[2] = msg.getData().getString("fields3");
				fields[3] = msg.getData().getString("fields4");
				fields[4] = msg.getData().getString("fields5");
				updateRowInTable(id, fields);
				break;
			}
						
			case  MESSAGE_HANDLE_ID_UPDATEROW_BACKGROUND:
			{
				int id = msg.getData().getInt(MESSAGE_KEY_ID);
				int color = msg.getData().getInt(MESSAGE_KEY_COLOR);
				TableRow tableRow= (TableRow)findViewById( id);
				if(tableRow != null) {
					int count = tableRow.getChildCount();
					for(int index = 0; index < count; index++) {
						TextView child = (TextView)(tableRow.getChildAt(index));
						if(child != null) {
							child.setBackgroundColor(color);
							
						}
					}
				}
				break;
			}
			default:
					
		}
			
		}
		  
	  };

• 数据更新(其他线程会调用)部分:

private final void updateRowInTable(int code,String[] otherFields) {
	  TableRow tableRow= (TableRow)findViewById(code);
	  if(tableRow == null)  {
		  Log.d("tablerow", "can't find row in the table!");
		  return;
	  }
	  int bgColorEnd = (otherFields[2].indexOf("-") >= 0)  ?  0xff2e8b57 : 0xffb22222;
      for(int index = 0; index < otherFields.length; index++) {
    	   int identity = code * 13  +(index+1);
    	  
    	  TextView textView=  (findViewById(identity)!= null)  ?  (TextView) findViewById(identity) :  new TextView(this);  
    	 
    	  if(otherFields[index].indexOf('-') >=0) {
    		  textView.setTextColor(Color.GREEN);
    	  }
    	  else if( index == 2) {
    		  textView.setTextColor(Color.RED);
    	  }
    	  else  {
    		  textView.setTextColor(Color.WHITE);
    	  }
    	  textView.setText(otherFields[index]);
    	  Log.d("tablerow", "updated  id:" + (code)  + ", value="  + otherFields[index] );
    	  if(findViewById(identity) == null){
    		  textView.setId(identity);
    		  tableRow.addView(textView);  
    	  	  Log.d("tablerow", "add new view!");
    	  }
    	  else {
    		  Log.d("tablerow", "upate view!");
    	  }
    	  textView.postInvalidate();
    	  //textView.invalidate();
      }
      tableRow.postInvalidate();
      //tableRow.invalidate();
      ColorRefreshTask refresh = new ColorRefreshTask(bgColorEnd,code);
      messageHandler.postDelayed(refresh, 50);  
      
}