Android Handler更新界面出错,

Question

    Handler handler = new Handler() {
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        ReturnShow.setText(sMsg);//ReturnShow是一个EditText 错误在这里
        ReturnShow.setSelection(ReturnShow.length());
    }
};

class ReadThread extends Thread {
    public void run() {
        sMsg = "...";
        handler.sendMessage(handler.obtainMessage());
    }
}

代码如上, setText那里每次都要出错, 是什么原因? 附上错误信息

Answer 1

RerurnShow为null
 ReturnShow = (EditText) findViewById(R.id.ResultShow);这句里面的ID搞错了,弄成一个非当前Activity的ID;

太粗心了