0

java.lang.RuntimeException：无法启动活动 ComponentInfo{com.amco.scanai/com.amco.scanai.activities.profile.ProfileActivity}：java.lang.IllegalStateException：TabLayoutMediator 在 ViewPager2 在 android.app.ActivityThread 有适配器之前附加android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 上 android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3257) 上 android.app.servertransaction.TransactionExecutor 上的 .performLaunchActivity(ActivityThread.java:3114)。 executeCallbacks(TransactionExecutor.java:108) 在 android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 在 android.app.ActivityThread$H.handleMessage(ActivityThread.java:1948) 在 android.os.Handler.dispatchMessage (Handler.java:106) 在 android.app 的 android.os.Looper.loop(Looper.java:214)。ActivityThread.main(ActivityThread.java:7050) 在 com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494) 在 com.android 的 java.lang.reflect.Method.invoke(Native Method)。 internal.os.ZygoteInit.main(ZygoteInit.java:965) 原因：java.lang.IllegalStateException: TabLayoutMediator 在 ViewPager2 之前附加在 com.google.android.material.tabs.TabLayoutMediator.attach(TabLayoutMediator.java:117 ) 在 com.amco.scanai.utilities.BindingAdapters.setPager2(BindingAdapters.java:163) 在 com.amco.scanai.databinding.ActivityProfileBindingImpl.executeBindings(ActivityProfileBindingImpl.java:207) 在 androidx.databinding.ViewDataBinding.executeBindingsInternal(ViewDataBinding. java:473) 在 com.amco.scanai.mvvm.base.BaseActivity 的 androidx.databinding.ViewDataBinding.executePendingBindings(ViewDataBinding.java:445)。performDataBinding(BaseActivity.java:105) 在 com.amco.scanai.mvvm.base.BaseActivity.onCreate(BaseActivity.java:60) 在 com.amco.scanai.activities.profile.ProfileActivity.onCreate(ProfileActivity.java:25)在 android.app.Activity.performCreate(Activity.java:7327) 在 android.app.Activity.performCreate(Activity.java:7318) 在 android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271) 在 android.app。 ActivityThread.performLaunchActivity(ActivityThread.java:3094) 在 android.app.servertransaction.TransactionExecutor 在 android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78) 在 android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3257) .executeCallbacks(TransactionExecutor.java:108) 在 android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 在 android.app。ActivityThread$H.handleMessage(ActivityThread.java:1948) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:214) at android.app.ActivityThread.main (ActivityThread.java:7050)

我将 ViewPager2 与 Tab 布局一起使用，通过使用绑定适配器我试图将适配器绑定到 ViewPager，然后将 ViewPager 绑定到 Tab 布局。但它不断给出上述错误。以下是代码。

Profile_Activity.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <data>

        <variable
            name="profile"
            type="com.amco.scanai.activities.profile.ProfileViewModel" />

    </data>

    <RelativeLayout xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/white"
        android:orientation="vertical"
        tools:context=".activities.profile.ProfileActivity">

        <RelativeLayout
            android:id="@+id/header"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerHorizontal="true"
            android:padding="@dimen/_10sdp">

            <include
                layout="@layout/view_button_back"
                android:layout_width="@dimen/_30sdp"
                android:layout_height="@dimen/_30sdp"
                android:layout_alignParentStart="true"
                android:layout_centerVertical="true"
                app:viewModel="@{(com.amco.scanai.mvvm.base.BaseViewModel)profile}" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:layout_marginHorizontal="@dimen/_7sdp"
                android:layout_toEndOf="@id/btnBack"
                android:fontFamily="@font/titillium_web_regular"
                android:text="My Profile"
                android:textColor="@color/black"
                android:textSize="@dimen/_16ssp" />

        </RelativeLayout>

        <com.google.android.material.tabs.TabLayout
            android:id="@+id/tab_layout"
            android:layout_width="match_parent"
            android:layout_height="@dimen/_40sdp"
            android:layout_below="@id/header"
            android:layout_centerHorizontal="true"
            android:background="@color/white"
            app:pager2="@{ viewPager }"
            app:tabBackground="@color/white"
            app:tabGravity="fill"
            app:tabIndicatorColor="@color/selected_tab"
            app:tabIndicatorFullWidth="false"
            app:tabIndicatorHeight="@dimen/_4sdp"
            app:tabMode="fixed"
            app:tabSelectedTextColor="@color/selected_tab"
            app:tabTextAppearance="@style/tab"
            app:tabTextColor="@color/unselected_tab" />

        <View
            android:id="@+id/div1"
            android:layout_width="match_parent"
            android:layout_height="@dimen/_1sdp"
            android:layout_below="@id/tab_layout"
            android:layout_marginHorizontal="@dimen/_20sdp"
            android:layout_marginVertical="@dimen/_10sdp"
            android:background="#EFEFEF" />

        <androidx.viewpager2.widget.ViewPager2
            android:id="@+id/view_pager"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_below="@id/div1"
            adapter2="@{profile.adapter}"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"
            app:onPageChangeListener="@{profile.onPageChangeListener}"
            app:setCurrentItem="@{profile.currentPosition}" />

    </RelativeLayout>

</layout>

ProfileViewModel.java

public class ProfileViewModel extends BaseViewModel<ProfileNavigator> {

    private static final String TAG = "ScanningViewModel";
    private int currentPosition;
    private Boolean initializeTabLayout;
    private SectionsPagerAdapter adapter;

    public ProfileViewModel(DataManager dataManager, ResourceProvider resourceProvider, SchedulerProvider schedulerProvider) {
        super(dataManager, resourceProvider, schedulerProvider);
        setCurrentPosition(0);
        setInitializeTabLayout(false);
    }

    public void setActivity(ProfileActivity activity) {
        setAdapter(new SectionsPagerAdapter(activity));
        setInitializeTabLayout(true);
    }

    @Bindable
    public Boolean getInitializeTabLayout() {
        return initializeTabLayout;
    }

    public void setInitializeTabLayout(Boolean initializeTabLayout) {
        this.initializeTabLayout = initializeTabLayout;
        notifyPropertyChanged(BR.initializeTabLayout);
    }

    @Bindable
    public int getCurrentPosition() {
        return currentPosition;
    }

    public void setCurrentPosition(int currentPosition) {
        this.currentPosition = currentPosition;
        notifyPropertyChanged(BR.currentPosition);
    }

    @Bindable
    public ViewPager2.OnPageChangeCallback getOnPageChangeListener() {
        return new ViewPager2.OnPageChangeCallback() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
                super.onPageScrolled(position, positionOffset, positionOffsetPixels);
            }

            @Override
            public void onPageSelected(int position) {
                super.onPageSelected(position);
                setCurrentPosition(position);
            }

            @Override
            public void onPageScrollStateChanged(int state) {
                super.onPageScrollStateChanged(state);
            }
        };
    }

    @Bindable
    public SectionsPagerAdapter getAdapter() {
        return adapter;
    }

    public void setAdapter(SectionsPagerAdapter adapter) {
        this.adapter = adapter;
        notifyPropertyChanged(BR.adapter);
    }

    @Override
    public void goBack() {
        getNavigator().goBack();
    }

    @Override
    public void goNext() {
    }

    public void onBackPressed() {
        if (getCurrentPosition() == 0) {
            getNavigator().goBack();
        } else {
            setCurrentPosition(0);
        }
    }

    public static class SectionsPagerAdapter extends FragmentStateAdapter {

        ProfileActivity activity;

        public SectionsPagerAdapter(FragmentActivity fa) {
            super(fa);
            activity = (ProfileActivity) fa;
        }

        @NotNull
        @Override
        public Fragment createFragment(int position) {
            return position == 0 ? new PersonalFragment(new WeakReference<>(activity)) :
                    position == 1 ? new PasswordFragment(new WeakReference<>(activity)) :
                            new BusinessFragment(new WeakReference<>(activity));
        }

        @Override
        public int getItemCount() {
            return 3;
        }
    }
}

BindingAdapters.java

@BindingAdapter("pager2")
public static void setPager2(TabLayout tabLayout, ViewPager2 viewPager) {

        new TabLayoutMediator(tabLayout, viewPager,
                (tab, position) -> tab.setText(position == 0 ? "Personal" : position == 1 ? "Password" : "Business")
        ).attach();

}

@BindingAdapter("adapter2")
public static void setAdapter2(ViewPager2 viewPager, ProfileViewModel.SectionsPagerAdapter adapter) {

        viewPager.setAdapter(adapter);

    }

@BindingAdapter("onPageChangeListener")
public static void setonPageChangeListener(ViewPager2 viewPager2, ViewPager2.OnPageChangeCallback listener) {

        if (listener != null)
            viewPager2.registerOnPageChangeCallback(listener);

    }
4

0 回答 0