我有以下内容Activity
,这是我的应用程序中的唯一一个:
MainActivity.java:
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
PermissionState state = PermissionState.get(this);
if (state == PermissionState.GRANTED) {
getWindow().setBackgroundDrawable(new ColorDrawable(-1));
}
super.onCreate(savedInstanceState);
ActivityMainBinding mainActivityBinding = DataBindingUtil.setContentView(this, R.layout.activity_main);
setSupportActionBar(mainActivityBinding.toolbarMain);
NavigationUI.setupWithNavController(mainActivityBinding.toolbarMain, Navigation.findNavController(this, R.id.nav_host_fragment));
}
}
与相关的布局Activity
如下并创建如下this https://developer.android.com/topic/libraries/architecture/navigation/navigation-implementing#add_a_navhostfragment_using_the_layout_editorAndroid 开发者教程。
活动_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</com.google.android.material.appbar.AppBarLayout>
<fragment
android:id="@+id/nav_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:navGraph="@navigation/nav_graph" />
</LinearLayout>
</layout>
The 导航图 https://developer.android.com/topic/libraries/architecture/navigation/navigation-implementing#Connect-destinations如下:
nav_graph.xml:
<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/nav_graph"
app:startDestination="@id/mainFragment">
<fragment
android:id="@+id/mainFragment"
android:name="com.example.myapp.MainFragment"
android:label="@string/app_name"
tools:layout="@layout/fragment_main">
<action
android:id="@+id/action_mainFragment_to_settingsFragment"
app:destination="@+id/settingsFragment" />
</fragment>
<fragment
android:id="@+id/settingsFragment"
android:name="com.example.myapp.SettingsFragment"
android:label="@string/settings" />
</navigation>
现在,除了托管Activity
,我的应用程序有两个Fragment
s,一个是主要的,另一个是设置的。
主要的Fragment
是我的应用程序的起始目的地,我想在那里检索主要活动变量“PermissionState state”根据权限状态执行一些操作,例如隐藏或显示某些权限View
s.
使用Android架构组件导航API版本1.0.0-beta01
从此以后,从托管传递数据的正确的、未弃用的策略是什么Activity
到出发目的地Fragment
,也许使用安全参数 https://developer.android.com/topic/libraries/architecture/navigation/navigation-pass-data#Safe-args如果可能的话?