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概念：pinchIn和pinchOut

a.2个手指同时按住A和B，同时将A滑向A1,B滑向B1，称为pinchIn

b.2个手指同时按住A1和B1，同时将A1滑向A，B1滑向B，成为pinchOut.

那么Pinch类就是接受这一指令的，传入的参数有方向direction，percent代表滑到对角线百分之几停止，steps代表滑到时间，一个step代表5毫秒。根据direction来判断是调用UiObject.pinchIn和UiObject.pinchOut.

Pinch代码：

package io.appium.android.bootstrap.handler;

import com.android.uiautomator.core.UiObjectNotFoundException;

import io.appium.android.bootstrap.*;

import org.json.JSONException;

import java.util.Hashtable;

/**

* This handler is used to pinch in/out elements in the Android UI.

*

* Based on the element Id, pinch in/out that element.

*

*/

public class Pinch 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();

AndroidElement el;

final String direction = params.get("direction").toString();

final Integer percent = (Integer) params.get("percent");

final Integer steps = (Integer) params.get("steps");

try {

el = command.getElement();

if (el == null) {

return getErrorResult("Could not find an element with elementId: "

+ params.get("elementId"));

}

} catch (final Exception e) { // JSONException, NullPointerException, etc.

return getErrorResult("Unknown error:" + e.getMessage());

}

Logger.debug("Pinching " + direction + " " + percent.toString() + "%"

+ " with steps: " + steps.toString());

boolean res;

if (direction.equals("in")) {

try {

res = el.pinchIn(percent, steps);

} catch (final UiObjectNotFoundException e) {

return getErrorResult("Selector could not be matched to any UI element displayed");

}

} else {

try {

res = el.pinchOut(percent, steps);

} catch (final UiObjectNotFoundException e) {

return getErrorResult("Selector could not be matched to any UI element displayed");

}

}

if (res) {

return getSuccessResult(res);

} else {

return getErrorResult("Pinch did not complete successfully");

}

}

}