学习使用Material Design控件（四）Android实现标题栏自动缩放、放大效果

<?xml version=”1.0” encoding=”utf-8”?><android.support.design.widget.CoordinatorLayout xmlns:android=“http://schemas.android.com/apk/res/android”  xmlns:app=“http://schemas.android.com/apk/res-auto”  android:layout_width=“match_parent”  android:layout_height=“match_parent”  android:fitsSystemWindows=“true”>  <android.support.design.widget.AppBarLayout    android:layout_width=“match_parent”    android:layout_height=“256dp”    android:fitsSystemWindows=“true”    android:theme=“@style/ThemeOverlay.AppCompat.Dark.ActionBar”>    <android.support.design.widget.CollapsingToolbarLayout      android:id=“@+id/collapsing_toolbar”      android:layout_width=“match_parent”      android:layout_height=“match_parent”      android:fitsSystemWindows=“true”      app:contentScrim=“?attr/colorPrimary”      app:expandedTitleMarginEnd=“64dp”      app:expandedTitleMarginStart=“48dp”      app:layout_scrollFlags=“scroll|exitUntilCollapsed”>      <ImageView        android:id=“@+id/ivImage”        android:layout_width=“match_parent”        android:layout_height=“match_parent”        android:fitsSystemWindows=“true”        android:scaleType=“centerCrop”        android:src=“@drawable/book1”        app:layout_collapseMode=“parallax”        app:layout_collapseParallaxMultiplier=“0.7” />      <android.support.v7.widget.Toolbar        android:id=“@+id/toolbar”        android:layout_width=“match_parent”        android:layout_height=“?attr/actionBarSize”        app:layout_collapseMode=“pin”        app:popupTheme=“@style/ThemeOverlay.AppCompat.Light” />    </android.support.design.widget.CollapsingToolbarLayout>  </android.support.design.widget.AppBarLayout>  <LinearLayout    android:layout_width=“match_parent”    android:layout_height=“match_parent”    android:orientation=“vertical”    app:layout_behavior=“@string/appbar_scrolling_view_behavior”>    <android.support.design.widget.TabLayout      android:id=“@+id/sliding_tabs”      android:layout_width=“match_parent”      android:layout_height=“wrap_content”      app:tabGravity=“fill”      app:tabMode=“fixed” />    <android.support.v4.view.ViewPager      android:id=“@+id/viewpager”      android:layout_width=“match_parent”      android:layout_height=“match_parent” />  </LinearLayout></android.support.design.widget.CoordinatorLayout>

//Toolbar Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); getSupportActionBar().setDisplayHomeAsUpEnabled(true); toolbar.setNavigationOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View view) {     onBackPressed();   } });//使用CollapsingToolbarLayout后，title需要设置到CollapsingToolbarLayout上 CollapsingToolbarLayout collapsingToolbar = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar); collapsingToolbar.setTitle("失控");//设置ViewPager mViewPager = (ViewPager) findViewById(R.id.viewpager); setupViewPager(mViewPager);//给TabLayout增加Tab, 并关联ViewPager TabLayout tabLayout = (TabLayout) findViewById(R.id.sliding_tabs); tabLayout.addTab(tabLayout.newTab().setText("内容简介")); tabLayout.addTab(tabLayout.newTab().setText("作者简介")); tabLayout.addTab(tabLayout.newTab().setText("目录")); tabLayout.setupWithViewPager(mViewPager);