Android两个ViewPager的联动效果的实现-创新互联

前言

以前做的项目，导航栏基本上是在顶部或者是在底部，但是最近开发的一款app，刚开始拿到设计图也是很懵逼的，导航栏居然是在中间，what fuck！设计图如下：

导航栏在中间就会涉及到两个viewpager之间的联动，viewpager的高度适应等问题，现在来纪录一下是怎么解决问题的？希望给有同样需求的提供一定的帮助。

（一）Viewpager 高度自适应

系统自动viewpager 不能设置wrap_content；

自定义viewpager，注意高度的设置否则底部空白的问题

网上也会有很多相关的教程，我选择了其中一个。具体代码如下：

public class WrapContentHeightViewPager extends ViewPager {
  private int current;
  private int height = 0;
  private boolean scrollble = true;

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

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

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    if (getChildCount() > current) {
      View child = getChildAt(current);
      child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
      int h = child.getMeasuredHeight();
      height = h;

    }
    heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY);
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  }

  public void resetHeight(int current) {
    this.current = current;
    if (getChildCount() > 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);
    }
  }

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

  @Override
  public boolean onInterceptTouchEvent(MotionEvent ev) {
    return scrollble && super.onInterceptTouchEvent(ev);
  }

  public boolean isScrollble() {
    return scrollble;
  }

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

}