bootstrap之Drag

Drag

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 org.json.JSONObject;import java.util.Hashtable;/** * This handler is used to drag in the Android UI. *  */public class Drag 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)   */  private static class DragArguments {    public AndroidElement el;    public AndroidElement destEl;    public final Point    start;    public final Point    end;    public final Integer  steps;    public DragArguments(final AndroidCommand command) throws JSONException {      final Hashtable<String, Object> params = command.params();      try {        if (params.get("elementId") != JSONObject.NULL) {          el = command.getElement();        }      } catch (final Exception e) {        el = null;      }      try {        if (params.get("destElId") != JSONObject.NULL) {          destEl = command.getDestElement();        }      } catch (final Exception e) {        destEl = null;      }      start = new Point(params.get("startX"), params.get("startY"));      end = new Point(params.get("endX"), params.get("endY"));      steps = (Integer) params.get("steps");    }  }  private AndroidCommandResult drag(final DragArguments dragArgs) {    Point absStartPos = new Point();    Point absEndPos = new Point();    final UiDevice device = UiDevice.getInstance();    try {      absStartPos = getDeviceAbsPos(dragArgs.start);      absEndPos = getDeviceAbsPos(dragArgs.end);    } catch (final InvalidCoordinatesException e) {      return getErrorResult(e.getMessage());    }    Logger.debug("Dragging from " + absStartPos.toString() + " to "        + absEndPos.toString() + " with steps: " + dragArgs.steps.toString());    final boolean rv = device.drag(absStartPos.x.intValue(),        absStartPos.y.intValue(), absEndPos.x.intValue(),        absEndPos.y.intValue(), dragArgs.steps);    if (!rv) {      return getErrorResult("Drag did not complete successfully");    }    return getSuccessResult(rv);  }  private AndroidCommandResult dragElement(final DragArguments dragArgs) {    Point absEndPos = new Point();    if (dragArgs.destEl == null) {      try {        absEndPos = getDeviceAbsPos(dragArgs.end);      } catch (final InvalidCoordinatesException e) {        return getErrorResult(e.getMessage());      }      Logger.debug("Dragging the element with id " + dragArgs.el.getId()          + " to " + absEndPos.toString() + " with steps: "          + dragArgs.steps.toString());      try {        final boolean rv = dragArgs.el.dragTo(absEndPos.x.intValue(),            absEndPos.y.intValue(), dragArgs.steps);        if (!rv) {          return getErrorResult("Drag did not complete successfully");        } else {          return getSuccessResult(rv);        }      } catch (final UiObjectNotFoundException e) {        return getErrorResult("Drag did not complete successfully"            + e.getMessage());      }    } else {      Logger.debug("Dragging the element with id " + dragArgs.el.getId()          + " to destination element with id " + dragArgs.destEl.getId()          + " with steps: " + dragArgs.steps);      try {        final boolean rv = dragArgs.el.dragTo(dragArgs.destEl.getUiObject(),            dragArgs.steps);        if (!rv) {          return getErrorResult("Drag did not complete successfully");        } else {          return getSuccessResult(rv);        }      } catch (final UiObjectNotFoundException e) {        return getErrorResult("Drag did not complete successfully"            + e.getMessage());      }    }  }  @Override  public AndroidCommandResult execute(final AndroidCommand command)      throws JSONException {    // DragArguments is created on each execute which prevents leaking state    // across executions.    final DragArguments dragArgs = new DragArguments(command);    if (command.isElementCommand()) {      return dragElement(dragArgs);    } else {      return drag(dragArgs);    }  }}

首先来看DragArguments对象。该类为Drag中的私有类，它的构造方法回去解析传入的command,然后获得并存储一些drag方法用到的参数。例如拖拽控件时，被拖拽的控件对象，拖拽到的控件对象。坐标拖拽时，起始点坐标、终点坐标、步骤。所以就把它看成一个实体类就行了。然后分控件和坐标分别调用dragElement()和drag()方法。

dragElement()

如果拖拽到的控件不存在，那么就要用到结束坐标。如果拖拽到的控件存在，那么就用该控件计算拖拽到坐标，调用UiObject.dragTo()方法来执行命令。

drag()

这个就好办了，都是坐标值，直接调用UiObject.dragTo来执行。