1、不显示问题–重写ViewPager

public class MyViewPager extends ViewPager {    public MyViewPager(Context context) {        super(context);    }    public MyViewPager(Context context, AttributeSet attrs) {        super(context, attrs);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        int height = 0;        for (int i = 0; i < getChildCount(); i++) {            View child = getChildAt(i);            child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));            int h = child.getMeasuredHeight();            if (h > height)                height = h;        }        heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);        super.onMeasure(widthMeasureSpec, heightMeasureSpec);    }}

2、不显示+空白问题—同样的重写Viewpager

public class ViewPagerForScrollView extends ViewPager{    private int current;    private int height = 0;    /**     * 保存position与对于的View（保存view对应的索引）     */    private HashMap<Integer, View> mChildrenViews = new LinkedHashMap<Integer, View>();    private boolean scrollble = true;    public ViewPagerForScrollView(Context context) {        super(context);    }    public ViewPagerForScrollView(Context context, AttributeSet attrs) {        super(context, attrs);    }    @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();        }if (mChildrenViews.size() != 0) {        heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); }        super.onMeasure(widthMeasureSpec, heightMeasureSpec);    }    /**     * 重新设置高度     *     * @param current     */    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（保存View对应的索引）,需要自适应高度的一定要设置这个     */    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;    }}

调用：

fragment需要这样写

Activity需要这样写

参考：https://blog.csdn.net/qq_27400335/article/details/81116982

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