先说下最近做应用市场，想要的效果如下：
1、上面actionbar使用的toolbar最新的工具条来代替acionbar.
2、toolbar下面有一个 app详情
3、app详情下面有一个滑动tab ，tab下是viewpage ，viewpage里面嵌套的是2个Fragment，一个是Scrollview,一个是ListView。
要实现，监听Scrollview或者ListView滚动事件，来推挤tab向上移动，并且悬停在Toolbar下面。
http://download.csdn.net/detail/xufeifandj/8431071
具体效果如图：
代码不多解释，直接下载demo自行运行demo哈。稍后放源码。
声明：本代码基于其他开源项目，修改而来。
package com.github.ksoichiro.android.observablescrollview.samples;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.view.ViewCompat;import android.support.v4.view.ViewPager;import android.support.v7.app.ActionBarActivity;import android.support.v7.widget.Toolbar;import android.view.View;import com.example.toolbar.R;import com.github.ksoichiro.android.observablescrollview.ObservableScrollView;import com.github.ksoichiro.android.observablescrollview.ObservableScrollViewCallbacks;import com.github.ksoichiro.android.observablescrollview.ScrollState;import com.github.ksoichiro.android.observablescrollview.ScrollUtils;import com.google.samples.apps.iosched.ui.widget.SlidingTabLayout;import com.nineoldandroids.view.ViewHelper;import com.nineoldandroids.view.ViewPropertyAnimator;public class ViewPagerTabScrollViewActivity extends ActionBarActivity implements ObservableScrollViewCallbacks { private View mHeaderView; private View appinfo; private int mBaseTranslationY; private ViewPager mPager; private NavigationAdapter mPagerAdapter; private Toolbar toolbar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_viewpagertab); toolbar=(Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); mHeaderView = findViewById(R.id.header); ViewCompat.setElevation(mHeaderView, getResources().getDimension(R.dimen.toolbar_elevation)); appinfo = findViewById(R.id.apptitleview); mPagerAdapter = new NavigationAdapter(getSupportFragmentManager()); mPager = (ViewPager) findViewById(R.id.pager); mPager.setAdapter(mPagerAdapter); SlidingTabLayout slidingTabLayout = (SlidingTabLayout) findViewById(R.id.sliding_tabs); slidingTabLayout.setCustomTabView(R.layout.tab_indicator, android.R.id.text1); slidingTabLayout.setSelectedIndicatorColors(getResources().getColor(R.color.accent)); slidingTabLayout.setDistributeEvenly(true); slidingTabLayout.setViewPager(mPager); // When the page is selected, other fragments' scrollY should be adjusted // according to the toolbar status(shown/hidden) slidingTabLayout.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { @Override public void onPageScrolled(int i, float v, int i2) { } @Override public void onPageSelected(int i) { propagateToolbarState(toolbarIsShown()); } @Override public void onPageScrollStateChanged(int i) { } }); propagateToolbarState(toolbarIsShown()); } @Override public void onScrollChanged(int scrollY, boolean firstScroll, boolean dragging) { //判断如果是拖动 if (dragging) { int toolbarHeight = appinfo.getHeight(); float currentHeaderTranslationY = ViewHelper.getTranslationY(mHeaderView); if (firstScroll) { if (-toolbarHeight < currentHeaderTranslationY) { mBaseTranslationY = scrollY; } } float headerTranslationY = ScrollUtils.getFloat(-(scrollY - mBaseTranslationY), -toolbarHeight, 0); ViewPropertyAnimator.animate(mHeaderView).cancel(); ViewHelper.setTranslationY(mHeaderView, headerTranslationY); }else{ if(!firstScroll){ int toolbarHeight = appinfo.getHeight(); float headerTranslationY = ScrollUtils.getFloat(-(scrollY - mBaseTranslationY), -toolbarHeight, 0); ViewPropertyAnimator.animate(mHeaderView).cancel(); ViewHelper.setTranslationY(mHeaderView, headerTranslationY); } } } @Override public void onDownMotionEvent() { } @Override public void onUpOrCancelMotionEvent(ScrollState scrollState) { mBaseTranslationY = 0; Fragment fragment = getCurrentFragment(); if (fragment == null) { return; } View view = fragment.getView(); if (view == null) { return; } int toolbarHeight = appinfo.getHeight(); final ObservableScrollView scrollView = (ObservableScrollView) view.findViewById(R.id.scroll); if (scrollView == null) { return; } int scrollY = scrollView.getCurrentScrollY(); if (scrollState == ScrollState.DOWN) {//按下 //判断滑动到顶部的时候，开始显示 toolbar 不是顶部的 隐藏toolbar if(scrollView.getScrollY()<=toolbarHeight){ showToolbar(); }else{ hideToolbar(); } } else if (scrollState == ScrollState.UP) {//抬起 if (toolbarHeight <= scrollY) { hideToolbar(); } else { showToolbar(); } } else { // // Even if onScrollChanged occurs without scrollY changing, toolbar should be adjusted if (toolbarIsShown() || toolbarIsHidden()) { // Toolbar is completely moved, so just keep its state // and propagate it to other pages propagateToolbarState(toolbarIsShown()); } else { // Toolbar is moving but doesn't know which to move: // you can change this to hideToolbar() showToolbar(); } } } private Fragment getCurrentFragment() { return mPagerAdapter.getItemAt(mPager.getCurrentItem()); } private void propagateToolbarState(boolean isShown) { int toolbarHeight = appinfo.getHeight(); //设置scrollY尚未创建的片段 // Set scrollY for the fragments that are not created yet mPagerAdapter.setScrollY(isShown ? 0 : toolbarHeight); //设置活动scrollY碎片 // Set scrollY for the active fragments for (int i = 0; i < mPagerAdapter.getCount(); i++) { // Skip current item if (i == mPager.getCurrentItem()) { continue; } // Skip destroyed or not created item Fragment f = mPagerAdapter.getItemAt(i); if (f == null) { continue; } ObservableScrollView scrollView = (ObservableScrollView) f.getView().findViewById(R.id.scroll); if (isShown) { // Scroll up if (0 < scrollView.getCurrentScrollY()) {//滚动到 顶部 scrollView.scrollTo(0, 0); } } else { // Scroll down (to hide padding)//滚动到底部 if (scrollView.getCurrentScrollY() < toolbarHeight) { scrollView.scrollTo(0, toolbarHeight); } } } } private boolean toolbarIsShown() { return ViewHelper.getTranslationY(mHeaderView) == 0; } private boolean toolbarIsHidden() { return ViewHelper.getTranslationY(mHeaderView) == -appinfo.getHeight(); } private void showToolbar() { float headerTranslationY = ViewHelper.getTranslationY(mHeaderView); if (headerTranslationY != 0) { ViewPropertyAnimator.animate(mHeaderView).cancel(); ViewPropertyAnimator.animate(mHeaderView).translationY(0).setDuration(200).start(); } propagateToolbarState(true); } private void hideToolbar() { float headerTranslationY = ViewHelper.getTranslationY(mHeaderView); int toolbarHeight = appinfo.getHeight(); if (headerTranslationY != -toolbarHeight) { ViewPropertyAnimator.animate(mHeaderView).cancel(); ViewPropertyAnimator.animate(mHeaderView).translationY(-toolbarHeight).setDuration(200).start(); } propagateToolbarState(false); } private static class NavigationAdapter extends CacheFragmentStatePagerAdapter { private static final String[] TITLES = new String[]{"Applepie", "Butter Cookie"}; private int mScrollY; public NavigationAdapter(FragmentManager fm) { super(fm); } public void setScrollY(int scrollY) { mScrollY = scrollY; } @Override protected Fragment createItem(int position) { Fragment f = new ViewPagerTabScrollViewFragment(); if (0 <= mScrollY) { Bundle args = new Bundle(); args.putInt(ViewPagerTabScrollViewFragment.ARG_SCROLL_Y, mScrollY); f.setArguments(args); } return f; } @Override public int getCount() { return TITLES.length; } @Override public CharSequence getPageTitle(int position) { return TITLES[position]; } }}- 1楼sjw890821sjw昨天 22:51
- 项目报错啊，不知道环境配的有啥问题