如何在v7工具栏上使用工具栏的主页按钮提供向上导航 [英] How provide Up navigation with toolbar's home button on v7 toolbar
问题描述
我的活动(import android.support.v7.widget.Toolbar;
)中有一个工具栏,我正尝试使用其主页按钮提供Up导航.我所拥有的:
I have a toolbar in my activity ( import android.support.v7.widget.Toolbar;
) and I'm trying to provide Up navigation using its home button. What I have:
清单:
<!-- ... -->
<activity android:name=".SettingsActivity"
android:label="@string/settings"
android:parentActivityName=".MainActivity"/>
<!-- ... -->
view_toolbar.xml:
view_toolbar.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:minHeight="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:elevation="4dp">
</android.support.v7.widget.Toolbar>
activity_settings.xml:
activity_settings.xml :
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- Toolbar -->
<include
layout="@layout/view_toolbar" />
<!-- ... -->
我的onCreate方法:
my onCreate method:
super.onCreate(bundle)
setContentView(R.layout.activity_settings);
// Set the toolbar
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
到目前为止,我不应该具有向上按钮,而我没有.所以我们很好.但是当我尝试添加它时,我做不到.
So far I shouldn't have an up button and I don't. So we're fine. But when I tried to add it, I couldn't.
首先,我尝试了这个:
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
Didn't work. Then I tried this (as shown here):
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(ToolbarActivity.this, "Up clicked",
Toast.LENGTH_SHORT).show();
NavUtils.navigateUpFromSameTask(ToolbarActivity.this);
}
});
我什至尝试了一种在某处看到的解决方法,包括创建一个虚拟菜单并尝试从onOptionsItemSelected
获取事件(该方式从未被调用).
I even tried a workaround I saw somewhere, involving creating a dummy menu and trying to get the event from onOptionsItemSelected
(which is never called by the way).
我该怎么办?通过工具栏提供向上导航的正确方法是什么?
What can I do? What is the correct way to provide Up navigation through toolbar?
推荐答案
这很简单.只需执行以下步骤:
It's very simple. Just do the following steps:
- 将工具栏添加到
activity_child.xml
:
(在我的项目中,此AppBarLayout
放置在
(In my project, this AppBarLayout
is placed inside a ConstraintLayout
)
<android.support.design.widget.AppBarLayout
android:id="@+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
...
- 在
ChildActivity.java
中设置工具栏
- Set up the toolbar in the
ChildActivity.java
public class ChildActivity extends AppCompatActivity
{
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_child);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_arrow_back_black_24dp);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
...
}
- 在
AndroidManifest.xml
中设置
parentActivityName
属性
<activity android:name=".ChildActivity"
android:theme="@style/AppTheme.NoActionBar"
android:parentActivityName=".ParentActivity"/>
重要
为使其正常工作,请在致电startActivity(intent)
后不要在父活动中致电finish()
.
For this to work properly, do not call finish()
in the parent activity after you call startActivity(intent)
.
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