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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()

直接调用UiObject.dragTo来执行