很多Android开发者会遇到的问题，ViewPager无法自适应内容的高度 下面根据内容动态设置ViewPager的高度，总结给出2种方式：
第一种 : 取所有view中最大高度作为ViewPager的高度，此方法试用所有page页高度相差不多的时候，否则下面会有空白的部分，代码如下：
public class AutoHeightViewPager extends ViewPager { public AutoHeightViewPager (Context context) { super(context); } public AutoHeightViewPager (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); } }使用方法也很简单，直接在xml布局里面替换原来的ViewPager就行：
xxx.xxx.xxx代表路径 <xxx.xxx.xxx.AutoHeightViewPager android:id="@+id/viewpager_my" android:layout_width="match_parent" android:layout_height="match_parent" />第二种 在遇到不是所有界面高度一样的情况下，会导致高度低的页面中出现空白，下面就介绍第二种方式动态设置高度：
public class AutoHeightViewPager extends ViewPager { public AutoHeightViewPager(Context context, AttributeSet attrs) { super(context, attrs); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); // find the current child view // and you must cache all the child view // use setOffscreenPageLimit(adapter.getCount()) View view = getChildAt(getCurrentItem()); if (view != null) { // measure the current child view with the specified measure spec view.measure(widthMeasureSpec, heightMeasureSpec); } setMeasuredDimension(getMeasuredWidth(), measureHeight(heightMeasureSpec, view)); } /** * 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; } /** * 单独测量view获取尺寸 * * @param view */ public void measeureView(View view) { int intw = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED); int inth = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED); // 重新测量view view.measure(intw, inth); // 以上3句可简写成下面一句 //view.measure(0,0); // 获取测量后的view尺寸 int intwidth = view.getMeasuredWidth(); int intheight = view.getMeasuredHeight(); } }注释中有详细解释，使用方法如下：
xml布局中配置xxx.xxx.xxx代表路径
<xxx.xxx.xxx.AutoHeightViewPager android:id="@+id/viewpager_my" android:layout_width="match_parent" android:layout_height="match_parent" /> 代码中调用 mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } @Override public void onPageSelected(final int position) { // 切换到当前页面，重置高度 mViewPager.requestLayout(); } @Override public void onPageScrollStateChanged(int state) { } }); 设置offset属性，预先加载全部view，防止下面的方法获取到没有加载的view是高度为0 // View view = getChildAt(getCurrentItem()); // 如果不设置，可能第三个页面以后就显示不出来了，因为offset就是默认值1了 mViewPager.setOffscreenPageLimit(adapter.getCount());以上就是总结的2种ViewPager自适应高度的方式，希望对你有帮助，不足之处还望大佬指教
