从UiAutomator在TV测试中的局限性说起：
智能TV的操作和手机的操作有很大不同，一般智能TV的操作为遥控器按键操作，来向TV OS发送 KeyCode，以完成指定操作。
UiAutomator在API中提供了控件和长按操作，也提供了点坐标的长按操作，但无法设置长按的时间。
UiAutomator在API中也提供了模拟发送KeyCode的方法，即UiDevice类中的pressKeyCode方法。
但TV遥控器按键的长按模拟方法，UiAutomator并没有直接提供，而电视中的视频快进等操作需要按 键长按，自动化测试有此方面的要求。
一. KeyCode按键长按操作通过Adb命令模拟
COMMAND: adb shell input keyevent --longpress 3
虽然可以实现长按操作，但长按只能实现简单的长按操作，长按时间较短，针对快进等需较长时间长按实现的操作无用。
二. Appium的KeyCode长按模拟
Appium里面实现了按键的长按操作，实现源码核心如下：
public AndroidCommandResult execute(final AndroidCommand command)
throws JSONException {
try {
InteractionController interactionController = UiAutomatorBridge.getInstance().getInteractionController();
final Hashtable<String, Object> params = command.params();
keyCode = (Integer) params.get("keycode");
metaState = params.get("metastate") != JSONObject.NULL ? (Integer) params
.get("metastate") : 0;
final long eventTime = SystemClock.uptimeMillis();
// Send an initial down event
final KeyEvent downEvent = new KeyEvent(eventTime, eventTime,
KeyEvent.ACTION_DOWN, keyCode, 0, metaState,
KeyCharacterMap.VIRTUAL_KEYBOARD, 0, 0, InputDevice.SOURCE_KEYBOARD);
if (interactionController.injectEventSync(downEvent)) {
// Send a repeat event. This will cause the FLAG_LONG_PRESS to be set.
final KeyEvent repeatEvent = KeyEvent.changeTimeRepeat(downEvent,
eventTime, 1);
interactionController.injectEventSync(repeatEvent);
// Finally, send the up event
final KeyEvent upEvent = new KeyEvent(eventTime, eventTime,
KeyEvent.ACTION_UP, keyCode, 0, metaState,
KeyCharacterMap.VIRTUAL_KEYBOARD, 0, 0, InputDevice.SOURCE_KEYBOARD);
interactionController.injectEventSync(upEvent);
}
return getSuccessResult(true);
} catch (final Exception e) {
return getErrorResult(e.getMessage());
}
}
核心主要是：injectEventSync方法,剖析其源码发现最终是调用了uiautomator JAR包中 com.android.uiautomator.core.InteractionController类的injectEventSync方法
只是在uiautomator JAR包中，上述类类型为default且上述方法private方法
若要调用需要使用反射技术
三. 自己实现的时间可控的长按操作模拟源码
public void execute(int keycode, int times) {
int keyCode = keycode;
int timeCount = times;
try {
// InteractionController interactionController = UiAutomatorBridge.getInstance().getInteractionController();
System.out.println("......ttt....");
UiDevice device = UiDevice.getInstance();
Class UiDevice_class = UiDevice.class;
Field field_UiD = UiDevice_class.getDeclaredField("mUiAutomationBridge");
field_UiD.setAccessible(true);
Object uiAutomatorBridge = field_UiD.get(device);
Class tmp = Class.forName("com.android.uiautomator.core.UiAutomatorBridge");
Field field = tmp.getDeclaredField("mInteractionController");
field.setAccessible(true);
Object interactionController = field.get(uiAutomatorBridge);
metaState = 0;
final long eventTime = SystemClock.uptimeMillis();
// Send an initial down event
final KeyEvent downEvent = new KeyEvent(eventTime, eventTime,
KeyEvent.ACTION_DOWN, keyCode, 0, metaState,
KeyCharacterMap.VIRTUAL_KEYBOARD, 0, 0, InputDevice.SOURCE_KEYBOARD);
System.out.println("......lll,....");
if (injectEventSync(downEvent,interactionController)) {
// Send a repeat event. This will cause the FLAG_LONG_PRESS to be set.
final KeyEvent repeatEvent = KeyEvent.changeTimeRepeat(downEvent,
eventTime, 1);
for(int i=0; i<timeCount; i++){
injectEventSync(repeatEvent,interactionController);
}
// Finally, send the up event
System.out.println("......lll,....");
final KeyEvent upEvent = new KeyEvent(eventTime, eventTime,
KeyEvent.ACTION_UP, keyCode, 0, metaState,
KeyCharacterMap.VIRTUAL_KEYBOARD, 0, 0, InputDevice.SOURCE_KEYBOARD);
injectEventSync(upEvent,interactionController);
}
return ;
} catch (final Exception e) {
return ;
}
}