从未设置过的工具栏导航图标 [英] Toolbar navigation icon never set

问题描述

我正在试用新的工具栏组件，但在导航图标方面遇到了一些问题.我想为后退导航实现自定义图标:

I'm trying the new Toolbar component and having some trouble with the navigation icon. I want to implement a custom icon for back navigation :

在我的清单中，我为我的活动设置了一个父项:

In my manifest i set a parent to my activity :

<activity android:name=".CardsActivity" android:parentActivityName=".MainActivity">
    <!-- Parent activity meta-data to support API level 7+ -->
    <meta-data
        android:name="android.support.PARENT_ACTIVITY"
        android:value=".MainActivity" />
</activity>

我像这样声明工具栏:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="com.example.lollitest.MainActivity" >
    
    <android.support.v7.widget.Toolbar
        android:id="@+id/my_awesome_toolbar"
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        android:minHeight="?attr/actionBarSize"
        android:layout_marginBottom="10dp"
        android:background="?attr/colorPrimary" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/my_awesome_toolbar"
        android:text="@string/hello_world" />

</RelativeLayout>

然后在我的活动中，我像这样配置工具栏:

Then in my activity i configure the Toolbar like this :

Toolbar toolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar);
toolbar.setNavigationIcon(R.drawable.ic_good);
toolbar.setTitle("Title");
toolbar.setSubtitle("Sub");
toolbar.setLogo(R.drawable.ic_launcher);
setSupportActionBar(toolbar);

这给了我:

后退图标不是我用setNavigationIcon()设置的！无论我给方法提供什么可绘制的导航图标始终是后退箭头.

The back icon is not the one i set with setNavigationIcon() ! Whatever drawable i give to the method the navigation icon is always the back arrow.

我试图删除清单中的父关联，但唯一的效果是(显然)防止按钮返回.

I have tried to remove the parent association in the manifest but the only effect is (obviously) to prevent the button to go back.

相反，如果我想要默认的后退箭头图标并且不调用 setNavigationIcon() 我根本没有任何图标.

On contrary if i want the default back arrow icon and don't call setNavigationIcon() i don't have any icon at all.

处理工具栏中导航图标的正确方法是什么(自定义和默认)?

注意:我在 Android 4.4 上运行我的测试

NOte : i'm running my test on Android 4.4

推荐答案

目前可以使用了，换个顺序:(好像是bug)

Currently you can use it, changing the order: (it seems to be a bug)

Toolbar toolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar);
setSupportActionBar(toolbar);

toolbar.setNavigationIcon(R.drawable.ic_good);
toolbar.setTitle("Title");
toolbar.setSubtitle("Sub");
toolbar.setLogo(R.drawable.ic_launcher);

这篇关于从未设置过的工具栏导航图标的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！