android - Android Handler更新界面报错

Question

Handler handler = new Handler() {
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        ReturnShow.setText(sMsg);//ReturnShow EditText
        ReturnShow.setSelection(ReturnShow.length());
    }
};

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

每次运行时，setText线路都会出错，我不知道为什么？

谢谢你的帮助。

Answer 1

确保ReturnShow在设置之前对其进行初始化..

就像是..

ReturnShow = (EditText)findViewById(R.id.edittext);