//=========================================================================
//== Utility Methods ===
//=========================================================================
/**
* 同步事件注入只可在测试线程中调用，不可在被测试者的主线程中调用，否则会导致被测试主线程阻塞
* Helper method injects a click event at a point on the active screen via the UiAutomation object.
* @param x the x position on the screen to inject the click event
* @param y the y position on the screen to inject the click event
* @param automation a UiAutomation object received through the current Instrumentation
*/
@WorkerThread
static void injectClickEvent(float x, float y, UiAutomation automation){
//A MotionEvent is a type of InputEvent.
//The event time must be the current uptime.
final long eventTime = SystemClock.uptimeMillis();
//A typical click event triggered by a user click on the touchscreen creates two MotionEvents,
//first one with the action KeyEvent.ACTION_DOWN and the 2nd with the action KeyEvent.ACTION_UP
MotionEvent motionDown = MotionEvent.obtain(eventTime, eventTime, KeyEvent.ACTION_DOWN,
x, y, 0);
//We must set the source of the MotionEvent or the click doesn't work.
motionDown.setSource(InputDevice.SOURCE_TOUCHSCREEN);
automation.injectInputEvent(motionDown, true);
MotionEvent motionUp = MotionEvent.obtain(eventTime, eventTime, KeyEvent.ACTION_UP,
x, y, 0);
motionUp.setSource(InputDevice.SOURCE_TOUCHSCREEN);
automation.injectInputEvent(motionUp, true);
//Recycle our events back to the system pool.
motionUp.recycle();
motionDown.recycle();
}
注意：injectInputEvent 的第二个参数 sync 当被设置为 true 的时候，只可在测试框架的子线程中调用，不可在被测试者的主线程（UI线程）中调用，否则会导致被测试UI线程阻塞。原因是调用之后需要在另一个线程中等待执行结果。
参考链接
How to inject click event with Android UiAutomation.injectInputEvent
