你如何从InstrumentationTestCase发送长按？

Question

在Android中，如何从InstrumentationTestCase发送长按？例如，我想做一个sendKeys(KEYCODE_DPAD_CENTER)，但要长按一下。

Answer 1

不知道这是否是唯一/正确的方式，但我设法这样做：

public void longClickDpadCenter() throws Exception {
    getInstrumentation().sendKeySync(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DPAD_CENTER));
    Thread.sleep(ViewConfiguration.get(mContext).getLongPressTimeout());
    getInstrumentation().sendKeySync(new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_DPAD_CENTER));
}

Answer 2

您可以尝试以下辅助方法：

private void longPress(int key) {
    long downTime = SystemClock.uptimeMillis();
    long eventTime = SystemClock.uptimeMillis();
    KeyEvent event1 = new KeyEvent(downTime, eventTime, KeyEvent.ACTION_DOWN, key, 0);
    KeyEvent event2 = new KeyEvent(downTime, eventTime, KeyEvent.ACTION_DOWN, key, 1);
    getInstrumentation().sendKeySync(event1);
    getInstrumentation().sendKeySync(event2);
}

使用示例：

longPress(KeyEvent.KEYCODE_ENTER);

Answer 3

android source code中的第179行：

Ex : TextController firstname;

firstname.text='' or null;