提供商城网站建设,做网站为什么图片上传不了,四川建设网站信息查询中心,阿里巴巴国际站用户规模Android scrollView和viewpager嵌套 指示器吸顶 根据viewpager每Android scrollView和viewpager嵌套 指示器吸顶 根据viewpager每个页面的内容适配高度这几天 朋友问我了个问题 有个特别的需求 页面如下就是当viewpager里面的当前页面内容足够多的时候 要去能滑上去 并且指示…Android scrollView和viewpager嵌套 指示器吸顶 根据viewpager每Android scrollView和viewpager嵌套 指示器吸顶 根据viewpager每个页面的内容适配高度这几天 朋友问我了个问题 有个特别的需求 页面如下就是当viewpager里面的当前页面内容足够多的时候 要去能滑上去 并且指示器吸顶 但是当内容不多的时候 能滑到哪就停在哪 当时第一反应是用coordinatelayout 结果不行 内容少的时候 也直接滑到顶部了activity的xml文件后来就直接用scrollView包裹来实现了 自定义scrollView实现滚动监听 用来实现指示器吸顶效果public classMyScrollview extendsScrollView {privateScrollViewListener scrollViewListener null;publicMyScrollview(Context context) {super(context);}publicMyScrollview(Context context,AttributeSet attrs) {super(context,attrs);}publicMyScrollview(Context context,AttributeSet attrs, intdefStyleAttr) {super(context,attrs,defStyleAttr);}public voidsetScrollViewListener(ScrollViewListener scrollViewListener) {this.scrollViewListener scrollViewListener;}Overrideprotected voidonScrollChanged(intl, intt, intoldl, intoldt) {super.onScrollChanged(l,t,oldl,oldt);if(scrollViewListener! null) {scrollViewListener.onScrollChanged(this,l,t,oldl,oldt);}}public interfaceScrollViewListener {voidonScrollChanged(MyScrollview scrollView, intl, intt, intoldl, intoldt);}}在activity里面设置监听scroll.setScrollViewListener(newMyScrollview.ScrollViewListener() {Overridepublic voidonScrollChanged(MyScrollview scrollView, intl, intt, intoldl, intoldt) {if(t iv.getHeight() mTabLayout.getParent() layout) {layout.removeView(mTabLayout);rl_layout.addView(mTabLayout);} else if(t iv.getHeight() mTabLayout.getParent() rl_layout) {rl_layout.removeView(mTabLayout);layout.addView(mTabLayout);}}});然后就是实现viewpager的每个页面的内容高度适配了 从写viewpagerpublic classCustomViewPager extendsViewPager {private intcurrent;private intheight 0;/*** 保存position与对于的View*/privateHashMap mChildrenViews newLinkedHashMap();private booleanscrollble true;publicCustomViewPager(Context context) {super(context);}publicCustomViewPager(Context context,AttributeSet attrs) {super(context,attrs);}Overrideprotected voidonMeasure(intwidthMeasureSpec, intheightMeasureSpec) {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 voidresetHeight(intcurrent) {this.current current;if(mChildrenViews.size() current) {LinearLayout.LayoutParams layoutParams (LinearLayout.LayoutParams) getLayoutParams();if(layoutParams null) {layoutParams newLinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,height);} else{layoutParams.height height;}setLayoutParams(layoutParams);}}/*** 保存position与对于的View*/public voidsetObjectForPosition(View view, intposition) {mChildrenViews.put(position,view);}Overridepublic booleanonTouchEvent(MotionEvent ev) {if(!scrollble) {return true;}return super.onTouchEvent(ev);}public booleanisScrollble() {returnscrollble;}public voidsetScrollble(booleanscrollble) {this.scrollble scrollble;}}用法是在每个fragment 的onCreatView里面添加一行代码就行然后在viewpager所在的activity里面设置监听 就可以了mViewPager.setOnPageChangeListener(newViewPager.OnPageChangeListener() {Overridepublic voidonPageScrolled(intposition, floatpositionOffset, intpositionOffsetPixels) {}Overridepublic voidonPageSelected(intposition) {mViewPager.resetHeight(position);}Overridepublic voidonPageScrollStateChanged(intstate) {}});下面是整个activity的代码packagecom.example.wenlaisu.myapplication;importandroid.os.Bundle;importandroid.support.design.widget.TabLayout;importandroid.support.v4.app.Fragment;importandroid.support.v4.view.ViewPager;importandroid.support.v7.app.AppCompatActivity;importandroid.widget.ImageView;importandroid.widget.LinearLayout;importandroid.widget.RelativeLayout;importjava.util.ArrayList;importjava.util.List;/*** Created by wenlaisu on 2018/4/12.*/public classViewPagerSample extendsAppCompatActivity {CustomViewPager mViewPager;List mFragments;String[] mTitles newString[]{主页,微博,相册};privateTabLayout mTabLayout;privateMyScrollview scroll;privateLinearLayout layout;privateRelativeLayout rl_layout;privateImageView iv;Overrideprotected voidonCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_third);// 第一步初始化ViewPager和TabLayoutmViewPager (CustomViewPager) findViewById(R.id.viewpager);mTabLayout (TabLayout) findViewById(R.id.tabs);layout (LinearLayout) findViewById(R.id.layout);rl_layout (RelativeLayout) findViewById(R.id.rl_layout);scroll (MyScrollview) findViewById(R.id.scroll);iv (ImageView) findViewById(R.id.iv);setupViewPager();}private voidsetupViewPager() {mFragments newArrayList();ListFragment listFragment newListFragment(mViewPager,0);ListFragment2 listFragment2 newListFragment2(mViewPager,1);ListFragment3 listFragment3 newListFragment3(mViewPager,2);mFragments.add(listFragment);mFragments.add(listFragment2);mFragments.add(listFragment3);// 第二步为ViewPager设置适配器BaseFragmentAdapter adapter newBaseFragmentAdapter(getSupportFragmentManager(),mFragments,mTitles);mViewPager.setAdapter(adapter);// 第三步将ViewPager与TableLayout 绑定在一起mTabLayout.setupWithViewPager(mViewPager);mViewPager.setOnPageChangeListener(newViewPager.OnPageChangeListener() {Overridepublic voidonPageScrolled(intposition, floatpositionOffset, intpositionOffsetPixels) {}Overridepublic voidonPageSelected(intposition) {mViewPager.resetHeight(position);}Overridepublic voidonPageScrollStateChanged(intstate) {}});scroll.setScrollViewListener(newMyScrollview.ScrollViewListener() {Overridepublic voidonScrollChanged(MyScrollview scrollView, intl, intt, intoldl, intoldt) {if(t iv.getHeight() mTabLayout.getParent() layout) {layout.removeView(mTabLayout);rl_layout.addView(mTabLayout);} else if(t iv.getHeight() mTabLayout.getParent() rl_layout) {rl_layout.removeView(mTabLayout);layout.addView(mTabLayout);}}});}}就可以了demo的github地址Android scrollView和viewpager嵌套 指示器吸顶 根据viewpager每相关教程
