手機自動化測試：appium源碼分析之bootstrap十七 2

控件

performMultiPointerGesture

public boolean performMultiPointerGesture(PointerCoords[] ...touches) {

    try {

      if (API_18) {

        // The compile-time SDK expects the wrong arguments, but the runtime

        // version in the emulator is correct. So we cannot do:

        //   `return el.performMultiPointerGesture(touches);`

        // Instead we need to use Reflection to do it all at runtime.

        Method method = this.el.getClass().getMethod("performMultiPointerGesture", PointerCoords[][].class);

        Boolean rt = (Boolean)method.invoke(this.el, (Object)touches);

        return rt;

      } else {

        Logger.error("Device does not support API < 18!");

        return false;

      }

    } catch (final Exception e) {

      Logger.error("Exception: " + e + " (" + e.getMessage() + ")");

      return false;

    }

  }

UiObject中有直接可以調用的performMultiPointerGesture方法，為什麼還要用反射呢。上面的方法裡的注釋是這樣解釋的：編譯的時候sdk會認為參數是錯誤的，但是運作時卻認為是正确的，是以隻有在運作時調用才能保證正确性。反射調用的就是運作時的環境，是以它使用了反射調用了performMultiPointerGesture。

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