在最近的项目中，要用到ViewPager，但是viewpager是放在recycleview里面，高度是不确定的，只好重写measure方法来根据子布局的高度来动态生成viewpager的高度，但是有个缺点，就是不能根据子布局的高度来收缩viewpager的高度，为了这个优化，在网上找了一个多小时，终于找到个方法，下面直接贴使用的方法:

1.将自定义viewpager放进自己的项目

package com.plyou.leintegration.view; import android.content.Context;import android.support.v4.view.ViewPager;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.widget.LinearLayout; import java.util.HashMap;import java.util.LinkedHashMap; /** * Created by admin on 2017/10/25. */ public class CustomViewPager extends ViewPager {     private int current;    private int height = 0;    /**     * 保存position与对于的View     */    private HashMap
    
      mChildrenViews = new LinkedHashMap
     
      ();     private boolean scrollble = true;     public CustomViewPager(Context context) {        super(context);    }     public CustomViewPager(Context context, AttributeSet attrs) {        super(context, attrs);    }      @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        if (mChildrenViews.size() > current) {            View child = mChildrenViews.get(current);            if (child != null) {                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;    }  }
     
    

2.在fragemnt的oncreatview里面调用viewpager方法

@Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {        // TODO: inflate a fragment view        view = LayoutInflater.from(getActivity()).inflate(R.layout.fragment_course_comment, container, false);        unbinder = ButterKnife.bind(this, view);        initView();        initData();        return view;    }private void initView() {        Bundle bundle = getArguments();        courseId = bundle.getString(Constant.COURSE_ID);        position = bundle.getInt(Constant.POSITION);        viewPager.setObjectForPosition(view, position);//调用viewpager的方法        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));        recyclerView.setNestedScrollingEnabled(false);        commentAdapter = new CourseCommentAdapter(getActivity());        recyclerView.setAdapter(commentAdapter);    }

3.每次滑动viewpager重新设置高度

viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {                            @Override                            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {                                viewPager.resetHeight(position);//重设高度                            }                            @Override                            public void onPageSelected(int position) {                            }                            @Override                            public void onPageScrollStateChanged(int state) {                            }                        });