解决ViewPager 高度wrap_content无效问题

今天做了的项目中.用了tabhost,然后下边切换部分用的viewPager.当我把viewPager设置为wrap_content的时候,发现.怎么也不能显示其中的子内容.然后百度一顿搜.没找到真正能完成的结果.然后google.在stackflow里发现了老外解决了该问题.下边把代码下!

/** * ViewPager wrapContent解决方案 */
public class WrapContentHeightViewPager extends ViewPager {/** * Constructor * * @param context the context */
    public WrapContentHeightViewPager(Context context) {
        super(context);
    }

    /** * Constructor * * @param context the context * @param attrs the attribute set */
    public WrapContentHeightViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

// @Override// protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {// super.onMeasure(widthMeasureSpec, heightMeasureSpec);//
//        // find the first child view// View view = getChildAt(0);// if (view != null) {//            // measure the first child view with the specified measure spec// view.measure(widthMeasureSpec, heightMeasureSpec);// }//
// setMeasuredDimension(getMeasuredWidth(), measureHeight(heightMeasureSpec, view));// }
    @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);
    }
    /** * Determines the height of this view * * @param measureSpec A measureSpec packed into an int * @param view the base view with already measured height * * @return The height of the view, honoring constraints from measureSpec */
    private int measureHeight(int measureSpec, View view) {
        int result = 0;
        int specMode = MeasureSpec.getMode(measureSpec);
        int specSize = MeasureSpec.getSize(measureSpec);

        if (specMode == MeasureSpec.EXACTLY) {
            result = specSize;
        } else {
            // set the height from the base view if available
            if (view != null) {
                result = view.getMeasuredHeight();
            }
            if (specMode == MeasureSpec.AT_MOST) {
                result = Math.min(result, specSize);
            }
        }
        return result;
    }

}

转载自： http://www.tuicool.com/articles/2YrmE3