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，假设你手法能够那么就是swipe走的路线，假设你手法不行，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);
  }
}

无论它怎样定义，先分析源代码最后再定义。

    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();

首先从命令里取得參数，然后解析出所须要的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传入不同的參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,看起来非常复杂，事实上非常easy，业务非常容易理解，处理这样的点的时候就须要推断非常多东西。上面的代码首先分析x坐标然后分析y坐标。x和y坐标的推断和处理时一样的，所以我仅仅讲一下x坐标。

首先推断x坐标是否为0，假设为0，定义初始点的x坐标为控件的中心点的横坐标。假设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详细值。假设上面2种情况都不符合，那就是详细坐标值，那就直接元素的x坐标值加上控件的边框左坐标值。最后依据传入的boolean值来推断是否做一个超出边界的验证。假设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，也是要先推断传过来的坐标值是否小于1，假设小于1，当作百分比来球坐标值。假设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方法来运行命令，推断是否运行成功。

总结

运行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。

bootstrap之Swipe