Android ViewPager嵌套滑动问题解决

ViewPager中间嵌套ViewPager时，默认事件会被内部ViewPager拦截，当滑动到最左边或者最右边时，会被外部ViewPager接收，如下图所示：

默认截图

现项目有一需求，要求内部ViewPager使用手动切换，左右滑动事件由外部ViewPager接收，待实现效果如下图所示：

内部ViewPager禁止滑动的截图

解决方案

自定义内部ViewPager，拦截内部滑动事件，重写canScrollHorizontally即可，直接返回false。

public class NoScrollViewPager extends ViewPager {
    public NoScrollViewPager(@NonNull Context context) {
        super(context);
    }

    public NoScrollViewPager(@NonNull Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean canScrollHorizontally(int direction) {
        return false;
    }
}

引用代码，布局全部使用java实现

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        final ViewPager contentView=new ViewPager(this);
        setContentView(contentView);
        final List views = new ArrayList<>();
        TextView view = new TextView(this);
        ViewGroup.LayoutParams params=new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.MATCH_PARENT);
        view.setLayoutParams(params);
        //数据填充
        view.setText("我是第一个TextView");
        view.setGravity(Gravity.CENTER);
        views.add(view);
        final ViewPager viewPager=new NoScrollViewPager(this);
        viewPager.setAdapter(new PagerAdapter() {
            @Override
            public int getCount() {
                return 2;
            }

            @Override
            public boolean isViewFromObject(@NonNull View view, @NonNull Object o) {
                return view == o;
            }
            @NonNull
            @Override
            public Object instantiateItem(@NonNull ViewGroup container, final int position) {
                TextView view = new TextView(MainActivity.this);
                ViewGroup.LayoutParams params=new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.MATCH_PARENT);
                view.setLayoutParams(params);
                //数据填充
                view.setText("我是第二个ViewPager——position："+position);
                view.setGravity(Gravity.CENTER);
                view.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        viewPager.setCurrentItem(position==0?1:0);
                    }
                });
                container.addView(view);
                return view;
            }

            @Override
            public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
                container.removeView((View) object);
            }
        });
        views.add(viewPager);
        PagerAdapter adapter = new PagerAdapter() {
            @Override
            public int getCount() {
                return views.size();
            }

            @Override
            public boolean isViewFromObject(@NonNull View view, @NonNull Object o) {
                return view == o;
            }

            @NonNull
            @Override
            public Object instantiateItem(@NonNull ViewGroup container, int position) {
                View view = views.get(position);
                container.addView(view);
                return view;
            }

            @Override
            public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
                container.removeView((View) object);
            }
        };
        contentView.setAdapter(adapter);
    }
}