自定义通知布局和文本颜色 [英] Custom notification layouts and text colors

问题描述

我的应用程序会显示一些通知，并且根据用户偏好，它可能会在通知中使用自定义布局.它运行良好，但有一个小问题 -- 文本颜色.Stock Android 和几乎所有制造商的皮肤都使用浅色背景的黑色文本作为通知文本，但三星没有:他们的通知下拉菜单具有深色背景，并且默认通知布局中的文本为白色.

My application shows some notifications, and depending on user preferences it might use a custom layout in a notification. It works well, but there is a small problem -- text colors. Stock Android and almost all manufacturer skins use black text against a light background for notification text, but Samsung doesn't: their notification pulldown has a dark background and the text in the default notification layout is white.

所以这会导致一个问题:不使用任何花哨布局的通知显示正常，但使用自定义布局的通知很难阅读，因为文本是黑色而不是默认的白色.甚至 官方文档 也只是设置了一个 #TextView 的 000 颜色，所以我在那里找不到任何指针.

So this causes a problem: the notifications that don't use any fancy layouts show up fine, but the one that uses a custom layout is hard to read because the text is black instead of the default white. Even the official documentation just sets a #000 color for a TextView, so I couldn't find any pointers there.

一位用户很友好地对问题进行了截图:

A user was kind enough to take a screenshot of the problem:

那么如何在布局中使用设备的默认通知文本颜色?我宁愿不开始根据手机型号动态更改文本颜色，因为这需要大量更新，而使用自定义 ROM 的人可能仍然会遇到问题，具体取决于他们使用的皮肤.

So how do I use the default notification text color from the device in my layouts? I'd rather not start dynamically altering the text color based on phone model, since that requires a lot of updating and people with custom ROM's might still get the problem, depending on the skin they're using.

推荐答案

Malcolm 的解决方案适用于 API>=9.这是旧 API 的解决方案:

Solution by Malcolm works fine with API>=9. Here's the solution for older API:

诀窍是创建标准的通知对象，然后遍历由 Notification.setLatestEventInfo(...) 创建的默认 contentView.当您找到合适的 TextView 时，只需获取 tv.getTextColors().getDefaultColor().

The trick is to create the standard notification object and then traverse the default contentView created by Notification.setLatestEventInfo(...). When you find the right TextView, just get the tv.getTextColors().getDefaultColor().

这是提取默认文本颜色和文本大小(以缩放密度像素为单位 - sp)的代码.

Here's the code that extracts the default text color and text size (in scaled density pixels - sp).

private Integer notification_text_color = null;
private float notification_text_size = 11;
private final String COLOR_SEARCH_RECURSE_TIP = "SOME_SAMPLE_TEXT";

private boolean recurseGroup(ViewGroup gp)
{
    final int count = gp.getChildCount();
    for (int i = 0; i < count; ++i)
    {
        if (gp.getChildAt(i) instanceof TextView)
        {
            final TextView text = (TextView) gp.getChildAt(i);
            final String szText = text.getText().toString();
            if (COLOR_SEARCH_RECURSE_TIP.equals(szText))
            {
                notification_text_color = text.getTextColors().getDefaultColor();
                notification_text_size = text.getTextSize();
                DisplayMetrics metrics = new DisplayMetrics();
                WindowManager systemWM = (WindowManager)getSystemService(Context.WINDOW_SERVICE);
                systemWM.getDefaultDisplay().getMetrics(metrics);
                notification_text_size /= metrics.scaledDensity;
                return true;
            }
        }
        else if (gp.getChildAt(i) instanceof ViewGroup)
            return recurseGroup((ViewGroup) gp.getChildAt(i));
    }
    return false;
}

private void extractColors()
{
    if (notification_text_color != null)
        return;

    try
    {
        Notification ntf = new Notification();
        ntf.setLatestEventInfo(this, COLOR_SEARCH_RECURSE_TIP, "Utest", null);
        LinearLayout group = new LinearLayout(this);
        ViewGroup event = (ViewGroup) ntf.contentView.apply(this, group);
        recurseGroup(event);
        group.removeAllViews();
    }
    catch (Exception e)
    {
        notification_text_color = android.R.color.black;
    }
}

调用 extractColors 即.在您的服务的 onCreate() 中.然后当你创建自定义通知时，你想要的颜色和文本大小在 notification_text_color 和 notification_text_size 中:

Call extractColors ie. in onCreate() of your service. Then when you're creating the custom notification, the color and text size you want are in notification_text_color and notification_text_size:

Notification notification = new Notification();
RemoteViews notification_view = new RemoteViews(getPackageName(), R.layout.notification);       
notification_view.setTextColor(R.id.label, notification_text_color);
notification_view.setFloat(R.id.label, "setTextSize", notification_text_size);

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