使用EditText實(shí)現(xiàn)搜索框，優(yōu)化數(shù)據(jù)請(qǐng)求 ，實(shí)現(xiàn)實(shí)時(shí)搜索展示

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1. 當(dāng)EditText內(nèi)容發(fā)生改變時(shí)等待1000毫秒，Message攜帶當(dāng)前EditText的內(nèi)容數(shù)據(jù)通知Hadnler去進(jìn)行處理
2. 通過(guò)判斷handler攜帶數(shù)據(jù)和EditText已存在的內(nèi)容數(shù)據(jù)是否相同決定是否進(jìn)行數(shù)據(jù)請(qǐng)求。
3. 當(dāng)handler攜帶數(shù)據(jù)不為空并且和EditText已存在內(nèi)容數(shù)據(jù)相同時(shí)進(jìn)行網(wǎng)絡(luò)請(qǐng)求，減少在輸入過(guò)程中不必要的請(qǐng)求發(fā)生

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())) {//進(jìn)行判斷
                pageNum = 1;
                getDataList(pageNum, etSearch.getText().toString());
            }
        }
    }
};

etSearch.addTextChangedListener(new MyTextWatcher());

List resultDataList;
public vo getDataList(int pageNum,String searchContext){
    ... 請(qǐng)求結(jié)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(); //攜帶當(dāng)前值
            mHandler.sendMessageDelayed(msg, 1000);//隔一小段時(shí)間發(fā)送msg
        } else {
            resultDataList.clear();
            userSelectAdapter.notifyDataSetChanged();
        }
    }
}