Android中列表的復(fù)用機(jī)制提高了APP的運(yùn)行效率,但隨之而來(lái)的復(fù)用的問(wèn)題總是讓程序員們頭痛,一個(gè)
創(chuàng)新互聯(lián)公司主營(yíng)常熟網(wǎng)站建設(shè)的網(wǎng)絡(luò)公司,主營(yíng)網(wǎng)站建設(shè)方案,APP應(yīng)用開(kāi)發(fā),常熟h5小程序定制開(kāi)發(fā)搭建,常熟網(wǎng)站營(yíng)銷推廣歡迎常熟等地區(qū)企業(yè)咨詢bug找頭天也找不到。我就把自己解決這方面的經(jīng)驗(yàn)貢獻(xiàn)出來(lái)供大家參考:
問(wèn)題1:什么是復(fù)用
復(fù)用其實(shí)指的是復(fù)用View,而綁定View的數(shù)據(jù)是變化的。
問(wèn)題2:復(fù)用的原理探究
為了徹底弄清楚復(fù)用的原理,和特地寫(xiě)了段小程序。
Adapter代碼:
class MyAdapter extends BaseAdapter{
@Override
public int getCount() {
return 20;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Log.i(TAG, "aaaaaaaaaa---------- getView: position = " + position + ",convertView = " + convertView);
ViewHolder holder;
if(convertView == null){
convertView = LayoutInflater.from(SimpleCheckBoxListActivity.this).inflate(R.layout.adapter_simple_checkbox_item,null,false);
holder = new ViewHolder();
holder.tv = (TextView) convertView.findViewById(R.id.tv);
holder.cb = (CheckBox) convertView.findViewById(R.id.cb);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.tv.setText("index = " + position);
Log.i(TAG, "bbbbbbbbbb---------- getView: position = " + position + ",convertView = " + convertView.toString());
//將convertView緩存起來(lái),方便后面的分析。
itemViews.put(position,convertView);
//分析當(dāng)前position是否復(fù)用了之前哪個(gè)位置的view
int reusePosition = analyseReusedWhichPosition(position);
if(reusePosition != -1){
Log.i(TAG, "getView: 位置 " + position + "復(fù)用了位置" + reusePosition + "的view");
}
return convertView;
}
class ViewHolder{
TextView tv;
CheckBox cb;
}
//分析當(dāng)前position是否復(fù)用了之前哪個(gè)位置的view
private int analyseReusedWhichPosition(int currentPosition){
View currentPositionView = itemViews.get(currentPosition);
for (int i = 0; i < currentPosition; i++) {
View beforePositionView = itemViews.get(i);
if(beforePositionView == null){
continue;
}
if(beforePositionView == currentPositionView){
return i;
}
}
return -1;
}
}日志分析:
1)程序初次運(yùn)行

打印的日志:
aaaaaaaaaa---------- getView: position = 0,convertView = null
bbbbbbbbbb---------- getView: position = 0,convertView = android.widget.LinearLayout{42eceab0 V.E..... ......I. 0,0-0,0}
aaaaaaaaaa---------- getView: position = 1,convertView = null
bbbbbbbbbb---------- getView: position = 1,convertView = android.widget.LinearLayout{42ee4650 V.E..... ......I. 0,0-0,0}
aaaaaaaaaa---------- getView: position = 2,convertView = null
bbbbbbbbbb---------- getView: position = 2,convertView = android.widget.LinearLayout{42ee6140 V.E..... ......I. 0,0-0,0}
aaaaaaaaaa---------- getView: position = 3,convertView = null
bbbbbbbbbb---------- getView: position = 3,convertView = android.widget.LinearLayout{42ee7c10 V.E..... ......I. 0,0-0,0}
aaaaaaaaaa---------- getView: position = 4,convertView = null
bbbbbbbbbb---------- getView: position = 4,convertView = android.widget.LinearLayout{42ee96e0 V.E..... ......I. 0,0-0,0}
aaaaaaaaaa---------- getView: position = 5,convertView = null
bbbbbbbbbb---------- getView: position = 5,convertView = android.widget.LinearLayout{42eeb1e8 V.E..... ......I. 0,0-0,0}
aaaaaaaaaa---------- getView: position = 6,convertView = null
bbbbbbbbbb---------- getView: position = 6,convertView = android.widget.LinearLayout{42eeccb8 V.E..... ......I. 0,0-0,0}
aaaaaaaaaa---------- getView: position = 7,convertView = null
bbbbbbbbbb---------- getView: position = 7,convertView = android.widget.LinearLayout{42eee788 V.E..... ......I. 0,0-0,0}2)接著向下滑動(dòng),索引0沒(méi)有完全消失,索引8就出現(xiàn)了,這時(shí)還沒(méi)有復(fù)用。

打印的日志:
aaaaaaaaaa---------- getView: position = 8,convertView = null
bbbbbbbbbb---------- getView: position = 8,convertView = android.widget.LinearLayout{42ef5150 V.E..... ......I. 0,0-0,0}3)位置9出現(xiàn),索引0已經(jīng)完全消失(復(fù)用開(kāi)始出現(xiàn))

打印的日志:
aaaaaaaaaa---------- getView: position = 9,convertView = android.widget.LinearLayout{42eceab0 V.E..... ........ 0,-215-1080,1}
bbbbbbbbbb---------- getView: position = 9,convertView = android.widget.LinearLayout{42eceab0 V.E..... .......D 0,-215-1080,1}
getView: 位置 9復(fù)用了位置0的view
可以發(fā)現(xiàn)索引9處的hashCode與索引0處的hashCode都是42eceab04)緊接著向下滾動(dòng)到最后(注意是慢慢地滾動(dòng))

打印的日志:
aaaaaaaaaa---------- getView: position = 10,convertView = android.widget.LinearLayout{42ee4650 V.E..... ........ 0,-213-1080,3}
bbbbbbbbbb---------- getView: position = 10,convertView = android.widget.LinearLayout{42ee4650 V.E..... .......D 0,-213-1080,3}
getView: 位置 10復(fù)用了位置1的view
aaaaaaaaaa---------- getView: position = 11,convertView = android.widget.LinearLayout{42ee6140 V.E..... ........ 0,-205-1080,11}
bbbbbbbbbb---------- getView: position = 11,convertView = android.widget.LinearLayout{42ee6140 V.E..... .......D 0,-205-1080,11}
getView: 位置 11復(fù)用了位置2的view
aaaaaaaaaa---------- getView: position = 12,convertView = android.widget.LinearLayout{42ee7c10 V.E..... ........ 0,-202-1080,14}
bbbbbbbbbb---------- getView: position = 12,convertView = android.widget.LinearLayout{42ee7c10 V.E..... .......D 0,-202-1080,14}
getView: 位置 12復(fù)用了位置3的view
aaaaaaaaaa---------- getView: position = 13,convertView = android.widget.LinearLayout{42ee96e0 V.E..... ........ 0,-201-1080,15}
bbbbbbbbbb---------- getView: position = 13,convertView = android.widget.LinearLayout{42ee96e0 V.E..... .......D 0,-201-1080,15}
getView: 位置 13復(fù)用了位置4的view
aaaaaaaaaa---------- getView: position = 14,convertView = android.widget.LinearLayout{42eeb1e8 V.E..... ........ 0,-188-1080,28}
bbbbbbbbbb---------- getView: position = 14,convertView = android.widget.LinearLayout{42eeb1e8 V.E..... .......D 0,-188-1080,28}
getView: 位置 14復(fù)用了位置5的view
aaaaaaaaaa---------- getView: position = 15,convertView = android.widget.LinearLayout{42eeccb8 V.E..... ........ 0,-213-1080,3}
bbbbbbbbbb---------- getView: position = 15,convertView = android.widget.LinearLayout{42eeccb8 V.E..... .......D 0,-213-1080,3}
getView: 位置 15復(fù)用了位置6的view
aaaaaaaaaa---------- getView: position = 16,convertView = android.widget.LinearLayout{42eee788 V.E..... ........ 0,-179-1080,37}
bbbbbbbbbb---------- getView: position = 16,convertView = android.widget.LinearLayout{42eee788 V.E..... .......D 0,-179-1080,37}
getView: 位置 16復(fù)用了位置7的view
aaaaaaaaaa---------- getView: position = 17,convertView = android.widget.LinearLayout{42ef5150 V.E..... ........ 0,-181-1080,35}
bbbbbbbbbb---------- getView: position = 17,convertView = android.widget.LinearLayout{42ef5150 V.E..... .......D 0,-181-1080,35}
getView: 位置 17復(fù)用了位置8的view
aaaaaaaaaa---------- getView: position = 18,convertView = android.widget.LinearLayout{42eceab0 V.E..... ........ 0,-195-1080,21}
bbbbbbbbbb---------- getView: position = 18,convertView = android.widget.LinearLayout{42eceab0 V.E..... .......D 0,-195-1080,21}
getView: 位置 18復(fù)用了位置0的view
aaaaaaaaaa---------- getView: position = 19,convertView = android.widget.LinearLayout{42ee4650 V.E..... ........ 0,-210-1080,6}
bbbbbbbbbb---------- getView: position = 19,convertView = android.widget.LinearLayout{42ee4650 V.E..... .......D 0,-210-1080,6}
getView: 位置 19復(fù)用了位置1的view可以看到向下慢慢滑動(dòng)的時(shí)候,復(fù)用是很有規(guī)律的。
但是如果快速的向下滑動(dòng)的時(shí)候,又發(fā)現(xiàn)不了什么規(guī)律:復(fù)用并非是連續(xù)的
aaaaaaaaaa---------- getView: position = 8,convertView = android.widget.LinearLayout{42f9a780 V.E..... ........ 0,-85-1080,131}
bbbbbbbbbb---------- getView: position = 8,convertView = android.widget.LinearLayout{42f9a780 V.E..... .......D 0,-85-1080,131}
getView: 位置 8復(fù)用了位置0的view
aaaaaaaaaa---------- getView: position = 9,convertView = android.widget.LinearLayout{42f9f818 V.E..... ........ 0,384-1080,600}
bbbbbbbbbb---------- getView: position = 9,convertView = android.widget.LinearLayout{42f9f818 V.E..... .......D 0,384-1080,600}
getView: 位置 9復(fù)用了位置3的view
aaaaaaaaaa---------- getView: position = 10,convertView = android.widget.LinearLayout{42f9dd48 V.E..... ........ 0,138-1080,354}
bbbbbbbbbb---------- getView: position = 10,convertView = android.widget.LinearLayout{42f9dd48 V.E..... .......D 0,138-1080,354}
getView: 位置 10復(fù)用了位置2的view
aaaaaaaaaa---------- getView: position = 11,convertView = android.widget.LinearLayout{42f9c278 V.E..... ........ 0,-108-1080,108}
bbbbbbbbbb---------- getView: position = 11,convertView = android.widget.LinearLayout{42f9c278 V.E..... .......D 0,-108-1080,108}
getView: 位置 11復(fù)用了位置1的view
aaaaaaaaaa---------- getView: position = 12,convertView = null
bbbbbbbbbb---------- getView: position = 12,convertView = android.widget.LinearLayout{42fad3a0 V.E..... ......I. 0,0-0,0}
aaaaaaaaaa---------- getView: position = 13,convertView = android.widget.LinearLayout{42fa2df0 V.E..... ........ 0,60-1080,276}
bbbbbbbbbb---------- getView: position = 13,convertView = android.widget.LinearLayout{42fa2df0 V.E..... .......D 0,60-1080,276}
getView: 位置 13復(fù)用了位置5的view
aaaaaaaaaa---------- getView: position = 14,convertView = android.widget.LinearLayout{42fa12e8 V.E..... ........ 0,-186-1080,30}
bbbbbbbbbb---------- getView: position = 14,convertView = android.widget.LinearLayout{42fa12e8 V.E..... .......D 0,-186-1080,30}
getView: 位置 14復(fù)用了位置4的view
aaaaaaaaaa---------- getView: position = 15,convertView = android.widget.LinearLayout{42fa48c0 V.E..... ........ 0,-150-1080,66}
bbbbbbbbbb---------- getView: position = 15,convertView = android.widget.LinearLayout{42fa48c0 V.E..... .......D 0,-150-1080,66}
getView: 位置 15復(fù)用了位置6的view
aaaaaaaaaa---------- getView: position = 16,convertView = android.widget.LinearLayout{42f9a780 V.E..... ........ 0,78-1080,294}
bbbbbbbbbb---------- getView: position = 16,convertView = android.widget.LinearLayout{42f9a780 V.E..... .......D 0,78-1080,294}
getView: 位置 16復(fù)用了位置0的view
aaaaaaaaaa---------- getView: position = 17,convertView = android.widget.LinearLayout{42f9f818 V.E..... ........ 0,13-1080,229}
bbbbbbbbbb---------- getView: position = 17,convertView = android.widget.LinearLayout{42f9f818 V.E..... .......D 0,13-1080,229}
getView: 位置 17復(fù)用了位置3的view
aaaaaaaaaa---------- getView: position = 18,convertView = android.widget.LinearLayout{42f9dd48 V.E..... ........ 0,-28-1080,188}
bbbbbbbbbb---------- getView: position = 18,convertView = android.widget.LinearLayout{42f9dd48 V.E..... .......D 0,-28-1080,188}
getView: 位置 18復(fù)用了位置2的view
aaaaaaaaaa---------- getView: position = 19,convertView = android.widget.LinearLayout{42fa6390 V.E..... ........ 0,-168-1080,48}
bbbbbbbbbb---------- getView: position = 19,convertView = android.widget.LinearLayout{42fa6390 V.E..... .......D 0,-168-1080,48}
getView: 位置 19復(fù)用了位置7的view5)最后,向上滾動(dòng)到索引為0的位置
aaaaaaaaaa---------- getView: position = 11,convertView = android.widget.LinearLayout{4304de70 V.E..... ........ 0,-212-1080,4}
bbbbbbbbbb---------- getView: position = 11,convertView = android.widget.LinearLayout{4304de70 V.E..... .......D 0,-212-1080,4}
getView: 位置 11復(fù)用了位置8的view
aaaaaaaaaa---------- getView: position = 10,convertView = android.widget.LinearLayout{4303ee70 V.E..... ........ 0,1829-1080,2045}
bbbbbbbbbb---------- getView: position = 10,convertView = android.widget.LinearLayout{4303ee70 V.E..... .......D 0,1829-1080,2045}
getView: 位置 10復(fù)用了位置1的view
aaaaaaaaaa---------- getView: position = 9,convertView = android.widget.LinearLayout{43040940 V.E..... ........ 0,1829-1080,2045}
bbbbbbbbbb---------- getView: position = 9,convertView = android.widget.LinearLayout{43040940 V.E..... .......D 0,1829-1080,2045}
getView: 位置 9復(fù)用了位置2的view
aaaaaaaaaa---------- getView: position = 8,convertView = android.widget.LinearLayout{4303d378 V.E..... ........ 0,1830-1080,2046}
bbbbbbbbbb---------- getView: position = 8,convertView = android.widget.LinearLayout{4303d378 V.E..... .......D 0,1830-1080,2046}
getView: 位置 8復(fù)用了位置0的view
aaaaaaaaaa---------- getView: position = 7,convertView = android.widget.LinearLayout{430474b8 V.E..... ........ 0,1825-1080,2041}
bbbbbbbbbb---------- getView: position = 7,convertView = android.widget.LinearLayout{430474b8 V.E..... .......D 0,1825-1080,2041}
getView: 位置 7復(fù)用了位置6的view
aaaaaaaaaa---------- getView: position = 6,convertView = android.widget.LinearLayout{43048f88 V.E..... ........ 0,1824-1080,2040}
bbbbbbbbbb---------- getView: position = 6,convertView = android.widget.LinearLayout{43048f88 V.E..... .......D 0,1824-1080,2040}
aaaaaaaaaa---------- getView: position = 5,convertView = android.widget.LinearLayout{43043ee0 V.E..... ........ 0,1822-1080,2038}
bbbbbbbbbb---------- getView: position = 5,convertView = android.widget.LinearLayout{43043ee0 V.E..... .......D 0,1822-1080,2038}
getView: 位置 5復(fù)用了位置4的view
aaaaaaaaaa---------- getView: position = 4,convertView = android.widget.LinearLayout{430459e8 V.E..... ........ 0,1823-1080,2039}
bbbbbbbbbb---------- getView: position = 4,convertView = android.widget.LinearLayout{430459e8 V.E..... .......D 0,1823-1080,2039}
aaaaaaaaaa---------- getView: position = 3,convertView = android.widget.LinearLayout{43042410 V.E..... ........ 0,1829-1080,2045}
bbbbbbbbbb---------- getView: position = 3,convertView = android.widget.LinearLayout{43042410 V.E..... .......D 0,1829-1080,2045}
aaaaaaaaaa---------- getView: position = 2,convertView = android.widget.LinearLayout{4304de70 V.E..... ........ 0,1826-1080,2042}
bbbbbbbbbb---------- getView: position = 2,convertView = android.widget.LinearLayout{4304de70 V.E..... .......D 0,1826-1080,2042}
aaaaaaaaaa---------- getView: position = 1,convertView = android.widget.LinearLayout{4303ee70 V.E..... ........ 0,1828-1080,2044}
bbbbbbbbbb---------- getView: position = 1,convertView = android.widget.LinearLayout{4303ee70 V.E..... .......D 0,1828-1080,2044}
aaaaaaaaaa---------- getView: position = 0,convertView = android.widget.LinearLayout{43040940 V.E..... ........ 0,1788-1080,2004}
bbbbbbbbbb---------- getView: position = 0,convertView = android.widget.LinearLayout{43040940 V.E..... .......D 0,1788-1080,2004}如上所述,到底誰(shuí)復(fù)用了誰(shuí)是隨機(jī)不定的,這個(gè)我們也沒(méi)有必要去關(guān)心。我們只要知道position是不變的就行了。
另外,除了打日志。可以選中某一個(gè)位置的checkbox,然后上下滑動(dòng),如果某個(gè)checkbox也莫名的選中了,那就說(shuō)明這個(gè)位置的checkbox復(fù)用了之前選中的那個(gè)checkbox。
問(wèn)題3:Adapter的notifyDataSetChanged()方法作了什么事情
notifyDataSetChanged,會(huì)重新走一遍可見(jiàn)的position的getView方法。
問(wèn)題4:復(fù)用出現(xiàn)的場(chǎng)景
1.if-else的坑:在Adapter中,如果綁定View的數(shù)據(jù)的時(shí)候如果有if判斷,往往很多人忘記了加else,這是大多數(shù)復(fù)用問(wèn)題出現(xiàn)的根源之一。在一般情況下else不寫(xiě)沒(méi)有邏輯錯(cuò)誤,但是在ListView復(fù)
用的情況下如果不寫(xiě)錯(cuò)誤就會(huì)帶來(lái)錯(cuò)亂的麻煩。
實(shí)際場(chǎng)景:
比如每個(gè)item可能有或沒(méi)有圖片picarrList,之前我只加了if判斷,如果有圖片就顯示。但后來(lái)上下一滑動(dòng)之后發(fā)現(xiàn)沒(méi)有圖片的item竟然也顯示了其它了item的圖片,于是追根溯源發(fā)現(xiàn)是這里的問(wèn)題。
2.checkbox等的復(fù)用問(wèn)題:果如下圖,是一個(gè)簡(jiǎn)單的CheckBox列表

第1頁(yè)剛好0-8索引,我將0索引處的checkbox設(shè)置為選中狀態(tài),然后向下滑動(dòng),發(fā)現(xiàn)下一個(gè)出現(xiàn)的checkbox(索引為10,不是9,也不一定就是10,而是索引0完全消失之后第一個(gè)出現(xiàn)的item)竟然也選中了。
百度了一下,可以用Map<Interger,Boolean>來(lái)記錄對(duì)應(yīng)position的checkbox的選中狀態(tài)。而且網(wǎng)上
的這個(gè)Map是事先就是預(yù)訂好大小的了,但實(shí)際中Map的大小是確定的。
細(xì)節(jié)1):Map<Interger,Boolean>來(lái)記錄對(duì)應(yīng)position的checkbox的選中狀態(tài),怎么初始化?
--1-- 可以先在成員或者構(gòu)造方法里實(shí)例化Map對(duì)象
Map<Integer,Boolean> isTitleCheckBoxSelected = new HashMap();
--2-- 在getView方法里初始化Map對(duì)象,默認(rèn)checkbox都是未選中狀態(tài)
if(!isTitleCheckBoxSelected.containsKey(position)){
Log.i(TAG, "bindData: init checkbox " + position);
isTitleCheckBoxSelected.put(position,false);
//如果啟動(dòng)了全選,則新出現(xiàn)的view也要選中。
if(isSelectedAllStarted){
isTitleCheckBoxSelected.put(position,true);
}
}上面的這段代碼其實(shí)是非常妙的,通過(guò)contains判斷,保證了初始化。如果后面操作了map,
也不會(huì)影響這段代碼對(duì)map的初始化。
map這種數(shù)據(jù)結(jié)構(gòu),由于key是唯一,可以做去重操作。這一點(diǎn)List則不可直接做到。
細(xì)節(jié)2):響應(yīng)checkbox的OnCheckedChangeListener事件,將改變后的狀態(tài)保存到map中。
header_checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if(isCheckedByCode) return;
isTitleCheckBoxSelected.put(position, !isTitleCheckBoxSelected.get(position));
}
});在onCheckedChanged方法里將對(duì)應(yīng)position的checkbox的狀態(tài)反轉(zhuǎn)。
細(xì)節(jié)3):將map中的對(duì)應(yīng)position的狀態(tài)值賦值給當(dāng)前的checkbox
但是有個(gè)問(wèn)題,checkbox的setChecked方法,看其源碼,會(huì)走OnCheckedChangeListener的回調(diào)

而此時(shí),setChecked方法我只想設(shè)置View的狀態(tài),并不想走它的回調(diào)方法。下面有2種方法可以解決這個(gè)問(wèn)題
方法1:在setChecked方法的前后用一個(gè)變量夾住,在回調(diào)方法里通過(guò)這個(gè)變量判斷回調(diào)是不是在代碼
里通過(guò)setChecked觸發(fā),如果是setChecked觸發(fā)的,則不執(zhí)行map的取反的操作。
isCheckedByCode = true; header_checkbox.setChecked(isTitleCheckBoxSelected.get(position)); isCheckedByCode = false;
這種方法多申請(qǐng)了個(gè)變量,耦合度比較高。
方法2:在setChecked方法之前將checkbox的監(jiān)聽(tīng)設(shè)置為null,在setChecked方法之后設(shè)置真正的監(jiān)聽(tīng)。
除了checkbox,其它的一些view,也可以通過(guò)以上的方法來(lái)解決復(fù)用的問(wèn)題。解決復(fù)用要遵循一個(gè)原則:MV分離,在view一些事件監(jiān)聽(tīng)里,一般情況下改變記錄狀態(tài)的Map值之后,切記立馬就將值設(shè)置給View,而應(yīng)該通過(guò)notifyDatasetChanged()方法將狀態(tài)更新到view上。
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網(wǎng)頁(yè)標(biāo)題:Android中復(fù)用問(wèn)題哲理性解析-創(chuàng)新互聯(lián)
標(biāo)題鏈接:http://chinadenli.net/article10/cdosgo.html
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