java - 如何禁用此特定 View 页面中的滑动功能？

Question

我对 Java 没有那么丰富的经验，所以我自己无法弄清楚。我买了一个带有标签布局的模板，如下所示(图 1):

我想禁用这两个选项卡之间的滑动功能，因此只能通过单击选项卡“TAB 2”来访问“TAB 2”。

互联网上有很多教程，但没有一个适合我的代码，所以我有点困惑。

这是我的 TabFragment:

public class TabFragment extends Fragment {
public static TabLayout tabLayout;
public static ViewPager viewPager;
public static int int_items = 2 ;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {


    View x =  inflater.inflate(R.layout.tab_layout,null);
    tabLayout = (TabLayout) x.findViewById(R.id.tabs);
    viewPager = (ViewPager) x.findViewById(R.id.viewpager);

    viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));

    viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        public void onPageScrollStateChanged(int state) {}
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}



    tabLayout.post(new Runnable() {
        @Override
        public void run() {
            tabLayout.setupWithViewPager(viewPager);
        }
    });

    return x;

}

class MyAdapter extends FragmentPagerAdapter {

    public MyAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position)
    {

        if(position == 0){
            return new Tab1();
        }
        if(position == 1){
            return new Tab2();
        }



        return null;
    }

    @Override
    public int getCount() {

        return int_items;

    }


    @Override
    public CharSequence getPageTitle(int position) {

        switch (position){
            case 0 :
                return "Tab 1";
            case 1 :
                return "Tab 2";

        }
        return null;
    }
}}

和我的 tab_layout.xml

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:layout_height="wrap_content">


    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        app:tabGravity="fill"
        app:tabMode="fixed"
        android:background="@color/material_blue_grey_800"
        app:tabIndicatorColor="@color/orange"
        app:tabSelectedTextColor="@color/orange"
        app:tabTextColor="@color/white"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </android.support.design.widget.TabLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginBottom="50dp">

    </android.support.v4.view.ViewPager>



</LinearLayout>

我尽力想办法解决这个问题，但没有成功，所以我希望你们中的一个人可以帮助我解决这个小问题:)

非常感谢。

Answer 1

您需要创建一个自定义ViewPager来拦截onTouch事件并避免默认行为。这样用户将无法在页面之间滑动，但可以触摸选项卡。

您可以查看已回答的链接:How do disable paging by swiping with finger in ViewPager but still be able to swipe programmatically?

编辑

我将通过步骤进行解释:

1. 创建一个名为 NonSwipeableViewPager 的新类

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.animation.DecelerateInterpolator;
import android.widget.Scroller;
import java.lang.reflect.Field;

public class NonSwipeableViewPager extends ViewPager {

    public NonSwipeableViewPager(Context context) {
        super(context);
        setMyScroller();
    }

    public NonSwipeableViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
        setMyScroller();
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        // Never allow swiping to switch between pages
        return false;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        // Never allow swiping to switch between pages
        return false;
    }

    //down one is added for smooth scrolling

    private void setMyScroller() {
        try {
            Class<?> viewpager = ViewPager.class;
            Field scroller = viewpager.getDeclaredField("mScroller");
            scroller.setAccessible(true);
            scroller.set(this, new MyScroller(getContext()));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public class MyScroller extends Scroller {
        public MyScroller(Context context) {
            super(context, new DecelerateInterpolator());
        }

        @Override
        public void startScroll(int startX, int startY, int dx, int dy, int duration) {
            super.startScroll(startX, startY, dx, dy, 350 /*1 secs*/);
        }
    }
}

修改您的布局以使用新的 ViewPager

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:layout_height="wrap_content">


    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        app:tabGravity="fill"
        app:tabMode="fixed"
        android:background="@color/material_blue_grey_800"
        app:tabIndicatorColor="@color/orange"
        app:tabSelectedTextColor="@color/orange"
        app:tabTextColor="@color/white"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
    </android.support.design.widget.TabLayout>

    <NonSwipeableViewPager <!-- You will need to import this correctly with your class package -->
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginBottom="50dp">

    </NonSwipeableViewPager>



</LinearLayout>

使用新的 ViewPager 更新您的 Activity

public class TabFragment extends Fragment {
public static TabLayout tabLayout;
public static NonSwipeableViewPager viewPager; // This line changed
public static int int_items = 2 ;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {


    View x =  inflater.inflate(R.layout.tab_layout,null);
    tabLayout = (TabLayout) x.findViewById(R.id.tabs);
    viewPager = (NonSwipeableViewPager) x.findViewById(R.id.viewpager); // This line changed

    viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));

    viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        public void onPageScrollStateChanged(int state) {}
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}



    tabLayout.post(new Runnable() {
        @Override
        public void run() {
            tabLayout.setupWithViewPager(viewPager);
        }
    });

    return x;

}

您可以保留相同的适配器MyAdapter。

这将避免在选项卡之间滑动，但会保留每个选项卡上的点击。