Scroview嵌套 viewpager Fragment出现的不显示，和不能动态改变 viewpager 高度问题

1.自定义viewpager

public class MyViewPager extends ViewPager {
    

  private int current;
    private int height = 0;
    /**
     * 保存position与对于的View
     */
    private HashMap<Integer, View> mChildrenViews = new LinkedHashMap<Integer, View>();

    private boolean scrollble = true;

    public MyViewPager(Context context) {
        super(context);
    }

    public MyViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
//禁止滑动
//    @Override
//    public boolean onInterceptTouchEvent(MotionEvent event) {
//        // Never allow swiping to switch between pages
//        return false;
//    }
//


    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        if (mChildrenViews.size() > current) {
            View child = mChildrenViews.get(current);
            child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
            height = child.getMeasuredHeight();
        }

        heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    }

    public void resetHeight(int current) {
        this.current = current;
        if (mChildrenViews.size() > current) {
            LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) getLayoutParams();
            if (layoutParams == null) {
                layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, height);
            } else {
                layoutParams.height = height;
            }
            setLayoutParams(layoutParams);
        }
    }

    /**
     * 保存position与对于的View
     */
    public void setObjectForPosition(View view, int position) {
        mChildrenViews.put(position, view);
    }


    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        if (!scrollble) {
            return true;
        }
        return super.onTouchEvent(ev);
    }


    public boolean isScrollble() {
        return scrollble;
    }

    public void setScrollble(boolean scrollble) {
        this.scrollble = scrollble;
    }

    @Override
    public void setCurrentItem(int item) {
        //去除页面切换时的滑动翻页效果
        super.setCurrentItem(item, false);
    }

}

 

 

2.  在fragment界面的 配置（重写onattach方法，拿到主界面的viewpager,并放置  fragment  在viewpager中的位置）

fragment_home.getView_pager() 是在fragment_home  中的方法

 

3.activity中的配置

 

布局

<com.qikeya.qkyxt.widgets.MyViewPager
    android:id="@+id/view_pager"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>

private MyViewPager view_pager;//声明变量

首先在 放置完fragment列表后，初始viewpager高度

 

2.  在在切换的时候，这里包括点击切换 和滑动切换  分别配置为：（切换到第几页，resetHeight就写几）

//放置fragment  碎片集合
private void setpage(List<Bean_tab> list) {
    fragmentList.clear();   //清空 碎片列表

    fragmentList.add(new Fragment_HotZhiBo());
    fragmentList.add(new Fragment_HotClass());

  

    // 给ViewPager设置适配器
    view_pager.setAdapter(new FragmentVpAdapter(getChildFragmentManager(), fragmentList));
    view_pager.setCurrentItem(0);// 设置当前显示标签页为第一页
    view_pager.addOnPageChangeListener(new MyOnPageChangeListener());// 滑动页面变化时的监听器

    view_pager.resetHeight(0);//设置初始高度未0

}

 

滑动同理

//viewpager  切换监听
class Pagerchage_Listener implements ViewPager.OnPageChangeListener {

    @Override
    public void onPageScrolled(int i, float v, int i1) {

    }

    @Override
    public void onPageSelected(int i) {
        switch (i) {
            case 0:
                tv_hotzhibo.setTextColor(lan);
                tv_hotclass.setTextColor(hei);
                tv_youhui.setTextColor(hei);
                view_pager.resetHeight(0);
                view_pager.setCurrentItem(0);

                break;
            case 1:

                tv_hotzhibo.setTextColor(hei);
                tv_hotclass.setTextColor(lan);
                tv_youhui.setTextColor(hei);
                view_pager.resetHeight(1);
                view_pager.setCurrentItem(1);

                break;
            case 2:

                tv_hotzhibo.setTextColor(hei);
                tv_hotclass.setTextColor(hei);
                tv_youhui.setTextColor(lan);
                view_pager.resetHeight(2);
                view_pager.setCurrentItem(2);


                break;

        }

    }

    @Override
    public void onPageScrollStateChanged(int i) {

    }
}

最后：

//解决不能滑动的 问题的 自定义scroview

/**
 * 不拦截左右滑动
 */

public class MyScroview extends ScrollView {

    public MyScroview(Context context) {
        super(context);
    }

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

    public MyScroview(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @TargetApi(21)
    public MyScroview(Context context, AttributeSet attrs, int defStyleAttr, int
            defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    private float mDownPosX = 0;
    private float mDownPosY = 0;

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        final float x = ev.getX();
        final float y = ev.getY();

        final int action = ev.getAction();
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                mDownPosX = x;
                mDownPosY = y;

                break;
            case MotionEvent.ACTION_MOVE:
                final float deltaX = Math.abs(x - mDownPosX);
                final float deltaY = Math.abs(y - mDownPosY);
                // 这里是否拦截的判断依据是左右滑动，读者可根据自己的逻辑进行是否拦截

                if (deltaX > deltaY) {// 左右滑动不拦截
                    return false;
                }
        }

        return super.onInterceptTouchEvent(ev);
    }

}