Android 如何获得 ActionBar 视图？

How to get ActionBar view?

提问by Emil Adz

I'm using the Showcaselibrary to explain my application feature to the user. In some point I need to dim the whole ActionBarto present another feature to the user.

我正在使用该Showcase库向用户解释我的应用程序功能。在某些时候，我需要调暗整体ActionBar以向用户展示另一个功能。

For that I'm using the setAlpha(float num)of the Viewclass. And so for doing that I need to get the actual view instance of my ActionBar

对于我使用setAlpha(float num)的的View类。为此，我需要获取我的实际视图实例ActionBar

By the way, I'm using the support-7-appcompatlibrary that gives ActionBar support for older systems.

顺便说一下，我正在使用support-7-appcompat为旧系统提供 ActionBar 支持的库。

Update

更新

In the meantime I found this option, if you configure a custom view and add it to you ActionBarusing:

同时我找到了这个选项，如果你配置一个自定义视图并将它添加到你ActionBar使用：

getSupportActionBar().setCustomView(v);

Then to get the Viewof the ActionBaryou could do:

然后得到View的ActionBar，你可以这样做：

(View) activity.getSupportActionBar().getCustomView().getParent().getParent()

Is there a simpler or easier way to do that?

有没有更简单或更简单的方法来做到这一点？

回答by idunnololz

Yep. You can actually get the view by using this function:

是的。您实际上可以使用此函数获取视图：

public View getActionBarView() {
    Window window = getWindow();
    View v = window.getDecorView();
    int resId = getResources().getIdentifier("action_bar_container", "id", "android");
    return v.findViewById(resId);
}

Pretty much the way this works is that the actionbar container uses the id android.R.id.action_bar_container, but this id is not public. Therefore we use getIdentifier() to retrieve this id and then the rest is simple.

几乎这种工作方式是 actionbar 容器使用 id android.R.id.action_bar_container，但这个 id 不是公开的。因此我们使用 getIdentifier() 来检索这个 id，然后剩下的就很简单了。

回答by android developer

I think this solution is more complete, handling both normal Activity and ActionBarActivity.

我认为这个解决方案更完整，处理正常的Activity和ActionBarActivity。

It also handles the case that the actionbar was set using a toolbar, but you need to implement it in the activity you've created:

它还处理使用工具栏设置操作栏的情况，但您需要在您创建的活动中实现它：

public static View getActionBarView(final Activity activity) {
    if (activity instanceof IToolbarHolder)
        return ((IToolbarHolder) activity).getToolbar();
    final String packageName = activity instanceof ActionBarActivity ? activity.getPackageName() : "android";
    final int resId = activity.getResources().getIdentifier("action_bar_container", "id", packageName);
    final View view = activity.findViewById(resId);
    return view;
}

public interface IToolbarHolder {
    public android.support.v7.widget.Toolbar getToolbar();
}

回答by Rahmat Rezaei

for support.v7getActionBarView(ById) doesn't work.

对于support.v7getActionBarView(ById) 不起作用。

this returns actionBar Toolbar :

这将返回 actionBar 工具栏：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ViewGroup actionBar = getActionBar(getWindow().getDecorView());
    TextView actionBarTitle = (TextView) actionBar.getChildAt(0);
}

public ViewGroup getActionBar(View view) {
    try {
        if (view instanceof ViewGroup) {
            ViewGroup viewGroup = (ViewGroup) view;

            if (viewGroup instanceof android.support.v7.widget.Toolbar) {
                return viewGroup;
            }

            for (int i = 0; i < viewGroup.getChildCount(); i++) {
                ViewGroup actionBar = getActionBar(viewGroup.getChildAt(i));

                if (actionBar != null) {
                    return actionBar;
                }
            }
        }
    } catch (Exception e) {
    }

    return null;
}

回答by Mohammad Ersan

I made a little fix on @idunnololz code to support ActionBarSherlock

我对@idunnololz 代码做了一些修复以支持 ActionBarSherlock

private View getActionBarView() {

    int actionViewResId = 0;
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) {
        actionViewResId = getResources().getIdentifier(
                "abs__action_bar_container", "id", getPackageName());
    } else {
        actionViewResId = Resources.getSystem().getIdentifier(
                "action_bar_container", "id", "android");
    }
    if (actionViewResId > 0) {
        return this.findViewById(actionViewResId);
    }

    return null;
}

回答by Jared Rummler

This will get the Toolbar/ActionBarwhen using the native ActionBar, your own Toolbarfrom appcompat, or the native Toolbaron Lollipop:

这将在使用 native 时获得Toolbar/ ，您自己的 appcompat 或Lollipop 上的 native ：ActionBarActionBarToolbarToolbar

public static ViewGroup findActionBar(Activity activity) {
    int id = activity.getResources().getIdentifier("action_bar", "id", "android");
    ViewGroup actionBar = null;
    if (id != 0) {
        actionBar = (ViewGroup) activity.findViewById(id);
    }
    if (actionBar == null) {
        actionBar = findToolbar((ViewGroup) activity.findViewById(android.R.id.content)
                .getRootView());
    }
    return actionBar;
}

private static ViewGroup findToolbar(ViewGroup viewGroup) {
    ViewGroup toolbar = null;
    for (int i = 0, len = viewGroup.getChildCount(); i < len; i++) {
        View view = viewGroup.getChildAt(i);
        if (view.getClass().getName().equals("android.support.v7.widget.Toolbar")
                || view.getClass().getName().equals("android.widget.Toolbar")) {
            toolbar = (ViewGroup) view;
        } else if (view instanceof ViewGroup) {
            toolbar = findToolbar((ViewGroup) view);
        }
        if (toolbar != null) {
            break;
        }
    }
    return toolbar;
}