在 VerticalViewPager 中滚动/滑动时 VideoView 消失

Question

我在使用 VerticalViewPager 时遇到了 VideoView 问题。

当我滚动/滑动 ViewPager 时，VideoView 变为黑色。实际上这里 VideoView 正在消失，黑色是 ViewPager 的背景。

我在使用水平 ViewPager 时没有这个问题，即使当前自定义 VerticalViewpager 设置为水平。 当我滚动时，VideoView 消失，当我从屏幕上抬起手指时，VideoView 再次出现。

我尝试了很多 VerticalViewpager 库，几乎所有的库都有同样的问题。

以前有人遇到过这个问题吗？如何解决这个问题？

这些是屏幕截图：

不滑动时的视频视图：

垂直滑动时的视频视图：

这是我的代码

VerticalViewpager.java

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

public class VerticalViewpager extends ViewPager {
    public VerticalViewpager(Context context) {
        super(context);
        init();
    }

    public VerticalViewpager(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
        // The majority of the magic happens here
        setPageTransformer(true, new VerticalPageTransformer());
        // The easiest way to get rid of the overscroll drawing that happens on the left and right
        setOverScrollMode(OVER_SCROLL_NEVER);
    }

    private class VerticalPageTransformer implements ViewPager.PageTransformer {

        @Override
        public void transformPage(View view, float position) {

            if (position < -1) { // [-Infinity,-1)
                // This page is way off-screen to the left.
                view.setAlpha(0);

            } else if (position <= 1) { // [-1,1]
                view.setAlpha(1);

                // Counteract the default slide transition
                view.setTranslationX(view.getWidth() * -position);

                //set Y position to swipe in from top
                float yPosition = position * view.getHeight();
                view.setTranslationY(yPosition);

            } else { // (1,+Infinity]
                // This page is way off-screen to the right.
                view.setAlpha(0);
            }
        }
    }

    /**
     * Swaps the X and Y coordinates of your touch event.
     */
    private MotionEvent swapXY(MotionEvent ev) {
        float width = getWidth();
        float height = getHeight();

        float newX = (ev.getY() / height) * width;
        float newY = (ev.getX() / width) * height;

        ev.setLocation(newX, newY);

        return ev;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev){
        boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
        swapXY(ev); // return touch coordinates to original reference frame for any child views
        return intercepted;
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        return super.onTouchEvent(swapXY(ev));
    }
}

MainActivity.java

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v7.app.AppCompatActivity;

import java.util.ArrayList;
import java.util.List;


public class MainActivity extends AppCompatActivity {

    MyPagerAdapter adapterViewPager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        VerticalViewpager vpPager = (VerticalViewpager) findViewById(R.id.vpPAger);
        adapterViewPager = new MyPagerAdapter(getSupportFragmentManager());
        vpPager.setAdapter(adapterViewPager);


        for (int i = 0; i < 2; i++) {
            adapterViewPager.addFragment(FragmentWithOneImage.newInstance("Frag "+ i,R.drawable.jackie));
        }

        vpPager.setAdapter(adapterViewPager);
    }

    public static class MyPagerAdapter extends FragmentStatePagerAdapter {
        private final List<Fragment> mFragments = new ArrayList<>();

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

        public void addFragment(Fragment fragment) {
            mFragments.add(fragment);
        }

        @Override
        public Fragment getItem(int position) {
            return mFragments.get(position);
        }

        @Override
        public int getCount() {
            return mFragments.size();
        }

        @Override
        public float getPageWidth(int position) {
            return super.getPageWidth(position);
        }
    }
}

FragmentWithOneImage.java

import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.VideoView;

public class FragmentWithOneImage extends Fragment {
    private String title;
    private int image;


    public static FragmentWithOneImage newInstance(String title, int resImage) {
        FragmentWithOneImage fragment = new FragmentWithOneImage();
        Bundle args = new Bundle();
        args.putInt("image", resImage);
        args.putString("title", title);
        fragment.setArguments(args);
        return fragment;
    }


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        image = getArguments().getInt("image", 0);
        title = getArguments().getString("title");
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_one_img, container, false);

        ImageView imageView = (ImageView) view.findViewById(R.id.imgMain);
        imageView.setImageResource(image);

        Uri uri = Uri.parse("http://abhiandroid-8fb4.kxcdn.com/ui/wp-content/uploads/2016/04/videoviewtestingvideo.mp4");
        VideoView simpleVideoView = (VideoView) view.findViewById(R.id.simpleVideoView); // initiate a video view
        simpleVideoView.setVideoURI(uri);
        simpleVideoView.start();
        return view;
    }

    @Override
    public void onResume() {
        super.onResume();
    }
}

activiy_main.xml

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

    <com.example.sudheeshm.verticalviewpager.VerticalViewpager
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/vpPAger"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:swipe_orientation="vertical"
        android:background="@android:color/black"/>

</LinearLayout>

fragment_one_img.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/white"
    >

    <VideoView
        android:id="@+id/simpleVideoView"
        android:layout_width="match_parent"
        android:layout_height="300dp" />
    <ImageView
        android:layout_below="@+id/simpleVideoView"
        android:id="@+id/imgMain"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <declare-styleable name="VerticalViewpager" >
        <attr name="swipe_orientation" format="enum" >
            <enum name="horizontal" value="0" />
            <enum name="vertical" value="1" />
        </attr>
    </declare-styleable>
</resources>

Answer 1

这与基于 SurfaceView 的 VideoView 有关，并且此视图未针对翻译进行优化（在 ViewPager 中滚动）。在以下链接中查看与 ViewPager 中的 VideoViews 相关的这些答案：发布 1、2。

也许您可以找到解决问题的方法。