项目未在viewpager适配器中获取onclick方法

Question

我已经在viewpager适配器中添加了两个片段..我只添加了一个带简单吐司的按钮... onclick方法没有触发

我已经设置了可点击，可聚焦的所有属性在xml中没有任何作用。

设置viewpager适配器

        ViewPagerAdapter viewPagerAdapter=new 
        ViewPagerAdapter(getSupportFragmentManager(),contactModels);
        viewPager=findViewById(R.id.loc_viewPager);
        viewPager.setAdapter(viewPagerAdapter);
        viewPager.setCurrentItem(0);
        viewPager.setOffscreenPageLimit(2);
        tabLayout.setupWithViewPager(viewPager);

Viewpager适配器

public class ViewPagerAdapter extends FragmentStatePagerAdapter

 {

    private static final String TAG = "ViewPagerAdapter";
ArrayList<ContactModel> arrayList=new ArrayList<>();
    public ViewPagerAdapter(FragmentManager fm,ArrayList<ContactModel> arrayList ) {
        super(fm);
        this.arrayList=arrayList;
    }


    @Override
    public Fragment getItem(int i) {
        Fragment selectedFragment=null;
        switch (i)
        {
            case 0:
                selectedFragment=ListOfContacts.newInstance(arrayList);
                break;
            case 1:
                selectedFragment= DueList.getInstance();
                break;



        }

        return selectedFragment;
    }



    @Override
    public int getCount() {
        return 2;
    }
    @Override
    public CharSequence getPageTitle(int position) {
        String s=null;
        switch (position)
        {
            case 0:
                s="List of contacts";
                break;
            case 1:
                s="Due list";
                break;



        }

        return s;
    }
}

Vieppager hml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:clickable="true"
    android:focusable="true"
    tools:context=".activities.MainActivity">

    <ImageView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:scaleType="centerCrop"
        android:src="@drawable/account_circle"
        app:layout_constraintBottom_toTopOf="@+id/guideline15"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="@+id/guideline16"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.45" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline15"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.1" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline16"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.8" />

    <android.support.design.widget.TabLayout
        android:id="@+id/tabLayout"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toTopOf="@+id/guideline17"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/guideline15" />

    <android.support.constraint.Guideline
        android:id="@+id/guideline17"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.2" />

    <android.support.v4.view.ViewPager
        android:id="@+id/loc_viewPager"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/tabLayout" />

</android.support.constraint.ConstraintLayout>

我的Duelist片段添加了一些onclick方法

public class DueList extends Fragment implements View.OnClickListener {
    private static final String TAG = "DueList";

    Button button;

    public static DueList getInstance()
    {
        DueList dueList=new DueList();
        Bundle bundle=new Bundle();
        dueList.setArguments(bundle);
        return dueList;
    }
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View  view = inflater.inflate(R.layout.fragment_due_list, container, false);
        button=view.findViewById(R.id.button);
        button.setOnClickListener(this);

        return view;
    }

    @Override
    public void onClick(View v) {
        Log.d(TAG, "onClick: ");
        Toast.makeText(getActivity(), "clicked", Toast.LENGTH_SHORT).show();
    }
}

到期清单xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    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">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

Answer 1

您无法确定该视图是否已在onCreateView中膨胀。

尝试在qazxsw poi中设置click Listener

Answer 2

尝试首先获取视图寻呼机适配器哪个片段在该片段内部加载点击事件后加载..将这两个方法添加到viewpager适配器中..

onViewCreated()

在使用viewpager之后获取片段之后...

 fun getCurrentFragment(): Fragment? {
    return mCurrentFragment
}

override fun setPrimaryItem(container: ViewGroup, position: Int, `object`: Any) {
    if (getCurrentFragment() !== `object`) {
        mCurrentFragment = `object` as Fragment
    }
    super.setPrimaryItem(container, position, `object`)

}