viewpage的重写：取消动画，wrap下自适应高度，limit为0不执行预加载，禁止左右滑动

1.wrap下自适应高度

public class WrapViewPager extends ViewPager{
    public WrapViewPager(Context context) {
        super(context);
    }

    public WrapViewPager(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.取消切换动画

@Override
    public void setCurrentItem(int item, boolean smoothScroll) {
        super.setCurrentItem(item, false);
    }

3.limit为0不执行预加载(建议把viewpage重写)

 public void setOffscreenPageLimit(int limit) {
        if (limit < DEFAULT_OFFSCREEN_PAGES) {
            Log.w(TAG, "Requested offscreen page limit " + limit + " too small; defaulting to " +
                    DEFAULT_OFFSCREEN_PAGES);
            limit = DEFAULT_OFFSCREEN_PAGES;
        }
        if (limit != mOffscreenPageLimit) {
            mOffscreenPageLimit = limit;
            populate();
        }

在调用的时候需要limit–》0
如果limit为3，建议最好在一个viewpage切换到其他地方的时候，内部嵌套的viewpage通过setCurrentItem（position，false进入到首部分）

4.禁止左右滑动

public class NoScrollViewPager extends ViewPager {
    public NoScrollViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

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

    @Override
    public boolean onTouchEvent(MotionEvent arg0) {
        return false;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent arg0) {
        return false;
    }
}

来源：CSDN

作者：学习沐

链接：https://blog.csdn.net/qq_36022808/article/details/103608183

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