目前我有一个扩展AppCompatActivity的自定义抽屉式活动,如下所示:
public class DrawerActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener{
...
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.activity_drawer);
...
}
@Override
public void setContentView(int layoutResID) {
frameLayout = findViewById(R.id.drawer_frame);
LayoutInflater.from(getApplicationContext()).inflate(layoutResID, frameLayout);
super.setContentView(drawerLayout);
}
...
}
正如你在这里所看到的,我覆盖了setContentView方法,所以扩展这个drawer Activity的Activity的布局id将被传递到这个方法中,并在drawer Activity的子视图中膨胀。简单地说,我希望所有扩展这个drawer Activity的Activity都有一个导航drawer。它对一般Activity工作得很好。
但是现在,我有一个Activity,它包含一个片段容器视图和扩展抽屉Activity。当我启动这个Activity时,应用程序崩溃并出现以下错误:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.aaa, PID: 10730
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.aaa/com.example.aaa.gym.GymActivity}: android.view.InflateException: Binary XML file line #29 in com.example.aaa:layout/activity_gym: Binary XML file line #29 in com.example.aaa:layout/activity_gym: Error inflating class androidx.fragment.app.FragmentContainerView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3635)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3792)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2210)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7839)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
Caused by: android.view.InflateException: Binary XML file line #29 in com.example.aaa:layout/activity_gym: Binary XML file line #29 in com.example.aaa:layout/activity_gym: Error inflating class androidx.fragment.app.FragmentContainerView
Caused by: android.view.InflateException: Binary XML file line #29 in com.example.aaa:layout/activity_gym: Error inflating class androidx.fragment.app.FragmentContainerView
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Constructor.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:343)
at android.view.LayoutInflater.createView(LayoutInflater.java:858)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1010)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:965)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1127)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1088)
at android.view.LayoutInflater.inflate(LayoutInflater.java:686)
at android.view.LayoutInflater.inflate(LayoutInflater.java:538)
at android.view.LayoutInflater.inflate(LayoutInflater.java:485)
at com.example.aaa.DrawerActivity.setContentView(DrawerActivity.java:57)
at com.example.aaa.gym.GymActivity.onCreate(GymActivity.java:62)
at android.app.Activity.performCreate(Activity.java:8051)
at android.app.Activity.performCreate(Activity.java:8031)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1329)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3608)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3792)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:103)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2210)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7839)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
Caused by: java.lang.UnsupportedOperationException: FragmentContainerView must be within a FragmentActivity to use android:name="com.example.aaa.gym.PlaceFragment"
E/AndroidRuntime: at androidx.fragment.app.FragmentContainerView.<init>(FragmentContainerView.java:142)
at androidx.fragment.app.FragmentContainerView.<init>(FragmentContainerView.java:120)
... 28 more
正如你在这里看到的,根本原因是java.lang.UnsupportedOperationException: FragmentContainerView must be within a FragmentActivity to use android:name="com.example.aaa.gym.PlaceFragment"
。但是,活动应该能够膨胀片段,因为它扩展了DrawerActivity,DrawerActivity扩展了AppCompatActivity,AppCompatActivity扩展了Fragment Activity。我对此非常困惑。
以下是活动代码:
public class GymActivity extends DrawerActivity implements OnMapReadyCallback, GoogleMap.OnMarkerClickListener {
private ActivityGymBinding binding;
...
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
markers = new ArrayList<>();
binding = ActivityGymBinding.inflate(getLayoutInflater());
// here crashes, the actual crash line is the second line of the drawer activity's setContentView
setContentView(binding.getRoot().getSourceLayoutResId());
...
}
...
}
这是活动xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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/mapLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".gym.GymActivity">
<com.google.android.gms.maps.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="@string/title_activity_gym"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.fragment.app.FragmentContainerView
android:id="@+id/place_fragment"
android:name="com.example.aaa.gym.PlaceFragment"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:layout="@layout/place_fragment" />
</androidx.constraintlayout.widget.ConstraintLayout>
而这个片段,几乎没有什么改变
public class PlaceFragment extends Fragment {
private PlaceViewModel mViewModel;
private PlaceFragmentBinding binding;
public static PlaceFragment newInstance() {
return new PlaceFragment();
}
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
mViewModel = new ViewModelProvider(requireActivity()).get(PlaceViewModel.class);
mViewModel.getName().observe(getViewLifecycleOwner(), s -> binding.name.setText(s));
mViewModel.getLocation().observe(getViewLifecycleOwner(), s -> binding.location.setText(s));
return inflater.inflate(R.layout.place_fragment, container, false);
}
}
fragment.xml,只是一个简单的框架布局
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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"
tools:context=".gym.PlaceFragment">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/name"
android:text="Hello" />
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/location"
android:text="Hello" />
</FrameLayout>
有人知道为什么我的应用程序崩溃吗?任何建议将不胜感激。
1条答案
按热度按时间xqk2d5yq1#
问题就在这里:
您使用的是应用程序上下文--特别是而不是您的Activity,因此不使用Activity的主题,Application类也不扩展
FragmentActivity
。您将希望使用LayoutInflater.from(this)
来实际将Activity用作布局inflater。然而,虽然这将修复崩溃,但
GymActivity
仍然无法正常工作,因为存在以下代码行:在这里,您创建了一个
binding
对象,但实际上并没有将其添加到Activity中。相反,您调用了setContentView
覆盖,该覆盖会膨胀该View的一个全新示例。这意味着对binding
的任何更改都不会反映在UI中。相反,您可能希望提供
setContentView
的覆盖,该覆盖接受View
并在FrameLayout上调用addView
,以将已膨胀的View添加到布局中。这样您就可以像这样使用它: