compile 'com.android.support:appcompat-v7:26.0.0-alpha1' compile 'com.android.support:design:26.0.0-alpha1' compile 'com.android.support:cardview-v7:26.0.0-alpha1'
2).修改style.xml文件,用AppCompat兼容库中的主题,且设置成NoActionBar(没有活动栏)
注意事项:
item的name是colorPrimary而不是android:colorPrimary
html
<resources> <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar"> <!-- Customize your theme here. --> <item name="colorPrimary">#269fe2</item> <item name="colorPrimaryDark">#3A5FCD</item> </style> </resources>
<resources> <string name="app_name">折叠工具栏</string> <string name="content">Learn and Share Android,Learn and Share Android,Learn and Share Android,Learn and Share Android,Learn and Share Android</string> </resources>
<?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" xmlns:app="http://schemas.android.com/apk/res-auto"> <android.support.design.widget.AppBarLayout android:id="@+id/app_bar" android:layout_width="match_parent" android:layout_height="200dp"> <!-- app:contentScrim 设置当工具栏收缩必定程度时所展现的主体颜色,--> <android.support.design.widget.CollapsingToolbarLayout android:id="@+id/collapsing_toolbar_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:minHeight="200dp" app:collapsedTitleGravity="left" app:expandedTitleMarginStart="10dp" app:expandedTitleMarginEnd="10dp" app:contentScrim="?attr/colorPrimary" app:layout_scrollFlags="scroll|exitUntilCollapsed"> <!--ImageView应当方Toolbar上面,由于CollapsingToolbarLayout是帧式布 局,如方下面就在最上层,会被覆盖--> <ImageView android:layout_width="match_parent" android:layout_height="match_parent" android:src="@mipmap/ic_bg" android:scaleType="centerCrop" app:layout_collapseMode="parallax" app:layout_collapseParallaxMultiplier="0.3"/> <!--这里工具栏颜色默认是透明,当工具栏折叠后CollapsingToolbarLayout的颜色充当Toolbar背景颜色--> <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" app:layout_collapseMode="pin"> </android.support.v7.widget.Toolbar> </android.support.design.widget.CollapsingToolbarLayout> </android.support.design.widget.AppBarLayout> <android.support.v4.widget.NestedScrollView android:layout_width="match_parent" android:layout_height="match_parent" app:layout_behavior="@string/appbar_scrolling_view_behavior"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:paddingTop="24dp"> <include layout="@layout/item_card"/> <include layout="@layout/item_card"/> <include layout="@layout/item_card"/> <include layout="@layout/item_card"/> <include layout="@layout/item_card"/> <include layout="@layout/item_card"/> </LinearLayout> </android.support.v4.widget.NestedScrollView> </android.support.design.widget.CoordinatorLayout>
<?xml version="1.0" encoding="utf-8"?> <android.support.v7.widget.CardView 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="wrap_content" android:layout_margin="10dp" app:contentPadding="10dp" app:cardElevation="10dp" app:cardCornerRadius="10dp"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Card" android:textSize="20sp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="20dp" android:text="@string/content"/> </android.support.v7.widget.CardView>
public class MainActivity extends AppCompatActivity { Toolbar toolbar; CollapsingToolbarLayout mCollapsingToolbarLayout; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); mCollapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar_layout); mCollapsingToolbarLayout.setCollapsedTitleTextColor(Color.WHITE); mCollapsingToolbarLayout.setExpandedTitleColor(Color.WHITE); } }