android报错:Only the original thread that created a view hierarchy can touch its views.

问题的报错位置是我用handler写了一个定时消息,在handleMessage()方法里直接写了ui更新操作,
这个报错的原因一般是因为在子线程中直接操作UI导致的（eg, setText()）。因为Android中相关的view和控件操作都不是线程安全的，所以Android禁止在非UI线程更新UI。
ps. 这里所指的操作一般是能会导致控件重绘(invalidate)的操作，在子线程执行setTextColor此类UI操作不会报错

**那么，如果子线程有需要操作UI的需求怎么办呢？一般来说，可以通过如下几种方式来实现。其原理都是通过间接调用，在主线程中去操作UI：

使用View.post方法，post一个Runnable对象，在run方法中操作UI**

final String text = Thread.currentThread().getId() + "_" + i++;
final TextView txtTime1 = (TextView)mainActivity.findViewById(R.id.txtTime1);
txtTime1.post(new Runnable() {@Overridepublic void run() {txtTime1.setText("[View.post]" + text);}
});

使用Activity.runOnUiThread方法，传入一个Runnable对象，在run方法中操作UI

final TextView txtTime2 = (TextView)mainActivity.findViewById(R.id.txtTime2);
mainActivity.runOnUiThread(new Runnable() {@Overridepublic void run() {txtTime2.setText("[Activity.runOnUiThread]");}
});

在Activity中创建一个Handler对象，在子线程中通过handle.post方法，传入一个Runnable对象，在run方法中操作UI

final TextView txtTime4 = (TextView)mainActivity.findViewById(R.id.txtTime4);
mainActivity.mHandler.post(new Runnable() {@Overridepublic void run() {txtTime4.setText("[Handler.post]" + text);}
});

在Activity中创建一个Handler对象，并且在handlerMessage方法中针对指定的消息去操作UI，而消息则是有子线程通过handler.sendMessage方法发送
1）在Activity的onCreate方法中创建一个Handler对象，并在收到自定义消息UPDATE_TIME_ID之后操作UI

mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);if (msg.what == UPDATE_TIME_ID) {String strTime = msg.getData().getString(UPDATE_TIME_KEY);((TextView)findViewById(R.id.txtTime3)).setText(strTime);} }
};

    2) 在子线程中通过handler.sendMessage方法发送ID为UPDATE_TIME_ID的消息

Message updateTimeMessage = Message.obtain();
Bundle bundle = new Bundle();
bundle.putString(UPDATE_TIME_KEY, "[Handle.sendMessage]" + text);
updateTimeMessage.what = MainActivity.UPDATE_TIME_ID;
updateTimeMessage.setData(bundle);
mainActivity.mHandler.sendMessage(updateTimeMessage);

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