## Android 'UIScrollable' 滑動(swipe): 簡單示例
Android的UIScrollable類在可滑動視圖中查找元素方面很有效。大多數情況下,你應該使用"scrllInfoView"類來執行滑動相關的操作,使得目標元素出現在屏幕中。
Android UIScrollable的[開發文檔](https://developer.android.google.cn/reference/androidx/test/uiautomator/UiScrollable)
以下場景我們可以使用UIScrollable滑動操作:
- 在list中查找元素(例如,國家列表)
- 查找未出現在屏幕中的元素(例如,輸入框,文本,按鈕)
ScrollIntoView使用 UiSelector 作為查詢標準,允許你使用以下方式進行查詢元素:
- 文本 方式(文本內容可以為:精確匹配,包含,匹配,以此文本開始,或是正則文本)
- ID 方式 (支持 精確匹配或正則)
- 其他不常用的方式(參考對應的開發文檔)
- 上述方式組合使用
Android UiSelector的[開發文檔](https://developer.android.google.cn/reference/androidx/test/uiautomator/UiSelector)
此簡單示例中,我們默認只有一個可滾動視圖,滾動方向從屏幕底部滾動到頂部。

### 以 文本 查找
```java
// Page object
@AndroidFindBy(uiAutomator = "new UiScrollable(new UiSelector().scrollable(true))" +
".scrollIntoView(new UiSelector().text(\"exact_text\"))")
MobileElement element;
@AndroidFindBy(uiAutomator = "new UiScrollable(new UiSelector().scrollable(true))" +
".scrollIntoView(new UiSelector().textContains(\"part_text\"))")
MobileElement element;
// FindElement
MobileElement element = (MobileElement) driver.findElement(MobileBy.AndroidUIAutomator(
"new UiScrollable(new UiSelector().scrollable(true))" +
".scrollIntoView(new UiSelector().text(\"exact_text\"))"));
MobileElement element = (MobileElement) driver.findElement(MobileBy.AndroidUIAutomator(
"new UiScrollable(new UiSelector().scrollable(true))" +
".scrollIntoView(new UiSelector().textContains(\"part_text\"))"));
```
### 以 ID 查找
```java
// Page object
@AndroidFindBy(uiAutomator = "new UiScrollable(new UiSelector().scrollable(true))" +
".scrollIntoView(new UiSelector().resourceIdMatches(\".*part_id.*\"))")
MobileElement element;
// FindElement
MobileElement element = (MobileElement) driver.findElement(MobileBy.AndroidUIAutomator(
"new UiScrollable(new UiSelector().scrollable(true))" +
".scrollIntoView(new UiSelector().resourceIdMatches(\".*part_id.*\"))"));
```
### ID和文本 組合查找
```java
// Page object
@AndroidFindBy(uiAutomator = "new UiScrollable(new UiSelector().scrollable(true))" +
".scrollIntoView(new UiSelector().resourceIdMatches(\".*part_id.*\").text(\"exact_text\"))")
MobileElement element;
// FindElement
MobileElement element = (MobileElement) driver.findElement(MobileBy.AndroidUIAutomator(
"new UiScrollable(new UiSelector().scrollable(true))" +
".scrollIntoView(new UiSelector().resourceIdMatches(\".*part_id.*\").text(\"exact_text\"))"));
```
### 長視圖問題
對于一些長視圖,需要設置"setMaxSearchSwipes"的值。這個參數的值決定在停止查找之前,最多滑動幾次。
```java
// set max swipes to 10
// FindElement
MobileElement element = (MobileElement) driver.findElement(MobileBy.AndroidUIAutomator(
"new UiScrollable(new UiSelector().scrollable(true)).setMaxSearchSwipes(10)" +
".scrollIntoView(new UiSelector().text(\"exact_text\"))"));
```
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