# Swipe
我定义为滑动，但它字面的意思又不是，事件的形式类似于小时候拿着一块石头片，朝水面飞过去，如果你手法可以那么就是swipe走的路线，如果你手法不行，接触水面的时候就没再飞起来那就会被人嘲笑的。
~~~
package io.appium.android.bootstrap.handler;
import com.android.uiautomator.core.UiDevice;
import com.android.uiautomator.core.UiObjectNotFoundException;
import io.appium.android.bootstrap.*;
import io.appium.android.bootstrap.exceptions.InvalidCoordinatesException;
import io.appium.android.bootstrap.utils.Point;
import org.json.JSONException;
import java.util.Hashtable;
/**
* This handler is used to swipe.
*
*/
public class Swipe extends CommandHandler {
/*
* @param command The {@link AndroidCommand} used for this handler.
*
* @return {@link AndroidCommandResult}
*
* @throws JSONException
*
* @see io.appium.android.bootstrap.CommandHandler#execute(io.appium.android.
* bootstrap.AndroidCommand)
*/
@Override
public AndroidCommandResult execute(final AndroidCommand command)
throws JSONException {
final Hashtable<String, Object> params = command.params();
final Point start = new Point(params.get("startX"), params.get("startY"));
final Point end = new Point(params.get("endX"), params.get("endY"));
final Integer steps = (Integer) params.get("steps");
final UiDevice device = UiDevice.getInstance();
Point absStartPos = new Point();
Point absEndPos = new Point();
if (command.isElementCommand()) {
try {
final AndroidElement el = command.getElement();
absStartPos = el.getAbsolutePosition(start);
absEndPos = el.getAbsolutePosition(end, false);
} catch (final UiObjectNotFoundException e) {
return getErrorResult(e.getMessage());
} catch (final InvalidCoordinatesException e) {
return getErrorResult(e.getMessage());
} catch (final Exception e) { // handle NullPointerException
return getErrorResult("Unknown error");
}
} else {
try {
absStartPos = getDeviceAbsPos(start);
absEndPos = getDeviceAbsPos(end);
} catch (final InvalidCoordinatesException e) {
return getErrorResult(e.getMessage());
}
}
Logger.debug("Swiping from " + absStartPos.toString() + " to "
+ absEndPos.toString() + " with steps: " + steps.toString());
final boolean rv = device.swipe(absStartPos.x.intValue(),
absStartPos.y.intValue(), absEndPos.x.intValue(),
absEndPos.y.intValue(), steps);
if (!rv) {
return getErrorResult("The swipe did not complete successfully");
}
return getSuccessResult(rv);
}
}
~~~
不管它如何定义，先分析源码最后再定义。
~~~
final Hashtable<String, Object> params = command.params();
final Point start = new Point(params.get("startX"), params.get("startY"));
final Point end = new Point(params.get("endX"), params.get("endY"));
final Integer steps = (Integer) params.get("steps");
final UiDevice device = UiDevice.getInstance();
Point absStartPos = new Point();
Point absEndPos = new Point();
~~~
首先从命令里取得参数，然后解析出所需要的3个变量：起始点start、终点end、步骤steps。然后获得设备对象，定义2个私有Point对象,以备后用。
然后分条件处理，处理控件还是处理坐标。
## 控件
~~~
final AndroidElement el = command.getElement();
absStartPos = el.getAbsolutePosition(start);
absEndPos = el.getAbsolutePosition(end, false);
~~~
首先获取控件对象，再通过getAbsolutePosition传入不同的参数获得在该控件上点击的起始点和结束点。
~~~
public Point getAbsolutePosition(final Point point,
final boolean boundsChecking) throws UiObjectNotFoundException,
InvalidCoordinatesException {
final Rect rect = el.getBounds();
final Point pos = new Point();
Logger.debug("Element bounds: " + rect.toShortString());
if (point.x == 0) {
pos.x = rect.width() * 0.5 + rect.left;
} else if (point.x <= 1) {
pos.x = rect.width() * point.x + rect.left;
} else {
pos.x = rect.left + point.x;
}
if (boundsChecking) {
if (pos.x > rect.right || pos.x < rect.left) {
throw new InvalidCoordinatesException("X coordinate ("
+ pos.x.toString() + " is outside of element rect: "
+ rect.toShortString());
}
}
if (point.y == 0) {
pos.y = rect.height() * 0.5 + rect.top;
} else if (point.y <= 1) {
pos.y = rect.height() * point.y + rect.top;
} else {
pos.y = rect.left + point.y;
}
if (boundsChecking) {
if (pos.y > rect.bottom || pos.y < rect.top) {
throw new InvalidCoordinatesException("Y coordinate ("
+ pos.y.toString() + " is outside of element rect: "
+ rect.toShortString());
}
}
return pos;
}
~~~
上面的一大段代码,看起来很复杂，其实很简单，业务很容易理解，处理这种点的时候就需要判断很多东西。上面的代码首先分析x坐标然后分析y坐标。x和y坐标的判断和处理时一样的，所以我只讲一下x坐标。
首先判断x坐标是否为0，如果为0，定义初始点的x坐标为控件的中心点的横坐标。如果x的坐标小于1，说明坐标为相对坐标，用百分比来求值，此时就要与宽度做乘积运算得到具体值。如果上面2种情况都不符合，那就是具体坐标值，那就直接元素的x坐标值加上控件的边框左坐标值。最后根据传入的boolean值来判断是否做一个超出边界的验证。如果超出边界就跑出异常。y坐标的获取方式类似。最后得到坐标值并返回，回到execute方法中。
## 坐标
~~~
absStartPos = getDeviceAbsPos(start);
absEndPos = getDeviceAbsPos(end);
~~~
通过调用getDeviceAbsPos()方法得到坐标值来初始化之前声明的私有Point对象.
~~~
protected static Point getDeviceAbsPos(final Point point)
throws InvalidCoordinatesException {
final UiDevice d = UiDevice.getInstance();
final Point retPos = new Point(point); // copy inputed point
final Double width = (double) d.getDisplayWidth();
if (point.x < 1) {
retPos.x = width * point.x;
}
if (retPos.x > width || retPos.x < 0) {
throw new InvalidCoordinatesException("X coordinate ("
+ retPos.x.toString() + " is outside of screen width: "
+ width.toString());
}
final Double height = (double) d.getDisplayHeight();
if (point.y < 1) {
retPos.y = height * point.y;
}
if (retPos.y > height || retPos.y < 0) {
throw new InvalidCoordinatesException("Y coordinate ("
+ retPos.y.toString() + " is outside of screen height: "
+ height.toString());
}
return retPos;
}
~~~
类似于上面的方法，也是要先判断传过来的坐标值是否小于1，如果小于1，当作百分比来球坐标值。如果超出屏幕的范围抛出异常，最后返回坐标值回到execute方法。
===============================================================================================================================
~~~
final boolean rv = device.swipe(absStartPos.x.intValue(),
absStartPos.y.intValue(), absEndPos.x.intValue(),
absEndPos.y.intValue(), steps);
~~~
最后调用UiDevice.swipe方法来执行命令，判断是否执行成功。
# 总结
执行swipe命令有2中命令格式
* 控件
* 坐标
坐标又分为相对坐标百分比和绝对坐标两种方法。
- 前言
- appium框架之bootstrap
- bootstrap之Click事件
- bootstrap之WaitForIdle&&Clear
- bootstrap之Orientation
- bootstrap之Swipe
- bootstrap之Flick
- bootstrap之Drag
- bootstrap之Pinch
- bootstrap之鼠标操作
- bootstrap之文本框的操作
- bootstrap之GetName&&GetAttribute&&GetDeviceSize&&GetSize&&GetLocation&&GetDataDir
- bootstrap之ScrollTo
- bootstrap之Wake&&PressBack&&TakeScreenshot&&OpenNotification
- bootstrap之PressKeyCode&&LongPressKeyCode
- bootstrap之DumpWindowHierarchy
- bootstrap之UpdateStrings
- bootstrap之MultiPointerGesture