如何从 InstrumentationTestCase 发送长按？答案

【问题标题】：How do you send a long press from an InstrumentationTestCase?如何从 InstrumentationTestCase 发送长按？
【发布时间】：2010-05-26 16:02:52
【问题描述】：

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。

【问题讨论】：

标签： android unit-testing keyevent

【解决方案1】：

不知道这是否是唯一/正确的方法，但我设法做到了：

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));
}

【讨论】：

也可以通过以下代码实现- KeyEvent event = new KeyEvent(downTime, eventTime, KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DPAD_CENTER, 1); getInstrumentation.sendKeySync(event);

【解决方案2】：

你可以试试下面的辅助方法：

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);
}

及用法示例：

longPress(KeyEvent.KEYCODE_ENTER);

【讨论】：

【解决方案3】：

android source code 中的第 179 行：

class InputKeyEvent implements InputCmd {
    @Override
    public void run(int inputSource, int displayId) {
        String arg = nextArgRequired();
        final boolean longpress = "--longpress".equals(arg);
        if (longpress) {
            arg = nextArgRequired();
        }

        do {
            final int keycode = KeyEvent.keyCodeFromString(arg);
            sendKeyEvent(inputSource, keycode, longpress, displayId);
        } while ((arg = nextArg()) != null);
    }

    private void sendKeyEvent(int inputSource, int keyCode, boolean longpress, int displayId) {
        final long now = SystemClock.uptimeMillis();
        int repeatCount = 0;

        KeyEvent event = new KeyEvent(now, now, KeyEvent.ACTION_DOWN, keyCode, repeatCount,
                0 /*metaState*/, KeyCharacterMap.VIRTUAL_KEYBOARD, 0 /*scancode*/, 0 /*flags*/,
                inputSource);
        event.setDisplayId(displayId);

        injectKeyEvent(event);
        if (longpress) {
            repeatCount++;
            injectKeyEvent(KeyEvent.changeTimeRepeat(event, now, repeatCount,
                    KeyEvent.FLAG_LONG_PRESS));
        }
        injectKeyEvent(KeyEvent.changeAction(event, KeyEvent.ACTION_UP));
    }
}

【讨论】：