Android EditText实现搜索框实时处理，优化数据请求

使用EditText实现搜索框，优化数据请求 ，实现实时搜索展示##

当EditText内容发生改变时等待1000毫秒，Message携带当前EditText的内容数据通知Hadnler去进行处理，通过判断携带数据和EditText此时的内容数据是否相同决定是否进行数据请求。减少多余的请求，提高效率

private final int searchWhat = 1;
private Handler mHandler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        if (msg.what == searchWhat) {
            if (msg.obj.toString().equals(etSearch.getText().toString())) {//进行判断
                pageNum = 1;
                getDataList(pageNum, etSearch.getText().toString());
            }
        }
    }
};

etSearch.addTextChangedListener(new MyTextWatcher());

List resultDataList;
public vo getDataList(int pageNum,String searchContext){
    ... 请求结果result 省略ListView和Adapter填充部分
    resultDataList = result;
    userSelectAdapter.notifyDataSetChanged();
}

private class MyTextWatcher implements TextWatcher {

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
    }

    @Override
    public void afterTextChanged(Editable s) {
        if (s.length() != 0 && s.toString().trim().length() != 0) {
            Message msg = Message.obtain();
            msg.what = searchWhat;
            msg.obj = s.toString(); //携带当前值
            mHandler.sendMessageDelayed(msg, 1000);//隔一小段时间发送msg
        } else {
            resultDataList.clear();
            userSelectAdapter.notifyDataSetChanged();
        }
    }
}