如何在actionBar中的徽标的左右设置空间? [英] How to set space on left&right of the logo in the actionBar?

问题描述

我想在操作标题(确切地说是工具栏)的活动标题的左侧显示位图，所以我使用了这个:

I want to show a bitmap on the left side of the title of the activity, in the actionbar (toolbar, to be exact), so I used this:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setLogo(R.mipmap.ic_launcher);
    ...

问题

事实是，徽标的左侧似乎有太多的空白，而标题文本距离徽标本身很近，因此看起来像这样:

The problem

Thing is, the logo seems to have too much margin on its left, while the title text is very near the logo itself, so it looks like this:

这根本不是对称的...

This is not symmetrical at all...

如果我有一个导航抽屉，这甚至会更糟:

This is even worse in case I have a nav drawer:

1. 我尝试了其他尺寸的图标，此外，我尝试使用位图而不是可绘制/mipmap资源(实际上我仍然需要使用位图)，例如:

1. I tried other sizes of the icon, plus I tried to use a bitmap instead of a drawable/mipmap resource (and I actually need to use a bitmap anyway), as such:

 TypedValue tv = new TypedValue();
 if (getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true)) {
     int actionBarHeight = TypedValue.complexToDimensionPixelSize(tv.data, getResources().getDisplayMetrics());
     Bitmap bitmap = Bitmap.createBitmap(actionBarHeight, actionBarHeight, Config.ARGB_8888);
     Canvas canvas = new Canvas(bitmap);
     final Paint paint = new Paint();
     paint.setColor(0xffff0000);
     canvas.drawPaint(paint);
     getSupportActionBar().setLogo(new BitmapDrawable(getResources(),bitmap));
 }

但我仍然得到相同的结果:

But I still got the same result:

1. 我尝试使用此功能:

1. I tried to use this:

 toolbar.setContentInsetsAbsolute(0,0);

我试图在工具栏的xml标记中使用它:

I tried to use this in the xml tag of the toolbar:

 android:contentInsetLeft="0px"
 android:contentInsetStart="0px"

我还尝试使用其他值在其最右端(至少使空格大小相等)，但它们似乎根本不影响徽标边距.

I also tried to play with the other values to its right&end (at least to make the spaces equal in size), but they don't seem to affect the logo margins at all.

1. 似乎唯一有用的是:

1. Only thing that seem to help is this:

 app:contentInsetStartWithNavigation="0px"

但是它只有在有导航抽屉的情况下才有用:

But it helps only if there is a navigation-drawer:

在没有导航抽屉的情况下，我仍然会看到额外的空间，这使得徽标左侧与其右侧相比看起来像是不均匀的空间.我试图将此值设置为负，但是在没有导航抽屉的情况下它什么也没做.

In the case of no navigation drawer, I still see extra space, which makes it look like un-even spaces on the left of the logo compared to on its right. I tried to set this value to be negative, but it doesn't do anything in the case of no nav-drawer.

我还尝试使用布局检查器"调查它为何具有额外的空间.工具，以便我可以强迫它具有更少的空间，但是我找不到会导致此问题的填充/边距:

1. I've also tried to investigate why it has the extra space, using the "layout inspector" tool so that I might be able to force it to have less space, but I couldn't find any padding/margins that will cause this:

如何避免这种行为?如何最小化/设置徽标左侧和右侧的空间?

How do I avoid this behavior? How can I minimize/set the space on the left&right of the logo?

为什么会发生?

我应该改用自定义视图吗?

Should I just use a custom view instead?

推荐答案

如何最小化/设置徽标左右两侧的空间?

How can I minimize/set the space on the left&right of the logo ?

在工具栏中使用这些属性来处理工具栏视图的边距.

Use these attributes in your toolbar to handle margins of the toolbar view.

        android:layout_marginLeft="-16dp"
        app:titleMarginStart="@dimen/your_required_space"

-16dp 保留约4dp的空间.

-16dpleaves about 4dp space.

使用 layout_marginLeft 的缺点是，当徽标或您的自定义位图之前有另一个视图时，它不能很好地工作.例如，对于导航抽屉，为汉堡图标，在启动儿童活动或打开导航抽屉时为向上箭头图标(后箭头).发生这种情况是因为徽标已被此类视图取代.

The disadvantage of using layout_marginLeft is that it does not work well when there is another view before the logo or your custom bitmap. For example, hamburger icon in case of Navigation Drawer, up-caret icon (back-arrow) when child activity is launched or navigation drawer is opened. This happens because the logo gets replaced by such views.

在这种情况下，您可以使用:

In such case, you can use :

        app:contentInsetStartWithNavigation="0dp"

为什么会发生?

也许，工具栏类使用已经设置的尺寸，开发人员认为这些尺寸是标准尺寸，并且没有明确的方法来更改它们.

Maybe, toolbar class uses already set dimensions which the developers think are the standard dimensions and there is no explicit way to alter them.

我应该改用自定义视图吗?

Should I just use a custom view instead?

您可以在完全控制的情况下使用自定义视图，但是有了自定义视图，您会遇到自定义难题.

You can use custom views as you've complete control but with custom views, you get custom headaches.

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