Question

在Android中，是否可以通过向上/向下按下音量按钮或通过按下电源按钮2或3次来发送消息？

我创建了一个SQLite数据库，其中包含名称，手机号码和消息。我想将保存的邮件发送到保存的号码。

Answer 1

对于音量按钮，您可以执行以下操作

int counter = 0;
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if ((keyCode == KeyEvent.KEYCODE_VOLUME_DOWN))
        {
            counter++;
            if (counter == 3)
            {
                //Do something
                //Send msg
            }

        }
        return true;
    }

Answer 2

我还没有测试。请尝试一下。

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN){
        // Your code here when pressing volumn down
        return true;
    } else if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
        // Your code here when pressing volumn up
        return true;
    } else if (keyCode == KeyEvent.KEYCODE_POWER) {
        // Your code here when pressing power
        return true;
    }
    return super.onKeyDown(keyCode, event);
}

Answer 3

将onKeyMultiple()与repeatCount一起使用以检查点击次数。

@Override
public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
    if ((keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) && repeatCount == 3) {
        //Send Message...
    }
    return super.onKeyMultiple(keyCode, repeatCount, event);
}

onKeyMultiple的Java文档：

        /**
         * Called when a user's interaction with an analog control, such as
         * flinging a trackball, generates simulated down/up events for the same
         * key multiple times in quick succession.
         *
         * @param keyCode The value in event.getKeyCode().
         * @param count Number of pairs as returned by event.getRepeatCount().
         * @param event Description of the key event.
         *
         * @return If you handled the event, return true.  If you want to allow
         *         the event to be handled by the next receiver, return false.
         */
        boolean onKeyMultiple(int keyCode, int count, KeyEvent event);

检测音量/电源按钮的多次单击以发送消息-Android

3 个答案: