CoordinatorLayout
翻译为协调者布局,是在 Google IO/15 大会发布的,是用来协调其子View们之间动作的一个容器,遵循Material Design风格,包含在 com.android.support:design
中。CoordinatorLayout
是一个超级强大的FrameLayout
,结合AppBarLayout
、 CollapsingToolbarLayout
等可产生各种炫酷的效果。
在项目的build.gradle
引入material design
库
老版本(项目未迁移至AndroidX):
implementation 'com.android.support:design:28.0.0'
新版本(项目已迁移至AndroidX),本文使用:
implementation 'com.google.android.material:material:1.1.0'
CoordinatorLayout
结合AppBarLayout
使用效果图:
布局文件使用:
<androidx.coordinatorlayout.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">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="100dp"
android:background="#222222"
android:gravity="center"
android:text="该区域可折叠"
android:textColor="@android:color/white"
android:textSize="30sp"
app:layout_scrollFlags="scroll" />
<TextView
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#DD012D"
android:gravity="center"
android:text="该区域为上滑至头部固定区域"
android:textColor="@android:color/white"
android:textSize="20sp" />
com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:id="@+id/rv_demo1_content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<TextView
android:layout_width="match_parent"
android:text="这是一个滚动布局"
android:textSize="200sp"
android:background="#00ff00"
android:layout_height="wrap_content"/>
androidx.core.widget.NestedScrollView>
androidx.coordinatorlayout.widget.CoordinatorLayout>
说明:
CoordinatorLayout
须要作为顶层父View,子View想要与CoordinatorLayout
实现"联动性"效果的首要条件是这个View必须实现了NestedScrollingChild
接口(例如:NestedScrollView
、RecyclerView
等控件)。CoordinatorLayout
子控件如果需要联动,需要设置app:layout_behavior
属性,上面AppBarLayout
没有设置是因为本身有个默认的app:layout_behavior
查看源码如下:
@CoordinatorLayout.DefaultBehavior(AppBarLayout.Behavior.class)
public class AppBarLayout extends LinearLayout {
XML使用app:layout_scrollFlags
设置,代码中获取该控件AppBarLayout.LayoutParams
再使用setScrollFlags(int)
设置
XML设置方法:
app:layout_scrollFlags="scroll|enterAlways"
代码中设置方法:
TextView text= ... //确保该View是被AppBarLayout包裹的
AppBarLayout.LayoutParams params =
(AppBarLayout.LayoutParams) text.getLayoutParams();
params.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL
| AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS);
几种设置效果如下:
app:layout_scrollFlags="scroll"
app:layout_scrollFlags="scroll|enterAlways"
android:minHeight="30dip"
app:layout_scrollFlags="scroll|enterAlways|enterAlwaysCollapsed"
android:minHeight="30dip"
app:layout_scrollFlags="scroll|exitUntilCollapsed" />
app:layout_scrollFlags="scroll|snap"
CollapsingToolbarLayout
使用效果图:
布局文件:
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:fitsSystemWindows="true"
android:layout_height="match_parent"
>
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:fitsSystemWindows="true"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<com.google.android.material.appbar.CollapsingToolbarLayout
android:id="@+id/toolbar_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:contentScrim="#ff0000"
app:collapsedTitleGravity="center"
app:expandedTitleGravity="left|bottom"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
app:title="杨幂"
app:toolbarId="@+id/toolbar">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="centerCrop"
app:layout_collapseMode="parallax"
app:srcCompat="@mipmap/ym" />
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="50dp"
app:layout_collapseMode="pin"
/>
com.google.android.material.appbar.CollapsingToolbarLayout>
com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:id="@+id/rv_demo1_content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<TextView
android:layout_width="match_parent"
android:text="这是一个滚动布局"
android:textSize="200sp"
android:background="#00ff00"
android:layout_height="wrap_content"/>
androidx.core.widget.NestedScrollView>
androidx.coordinatorlayout.widget.CoordinatorLayout>
CollapsingToolbarLayout部分属性
CoordinatorLayout
中的 Behavior
Behavior行为控制器:实现了用户可以在子视图上进行的一个或多个交互。这些交互可能包括拖动,滑动,甩动或任何其他手势。
Behavior中常用的重写的方法:
/**
* 确定使用Behavior的View要依赖的View的类型
* 只要是CoordinatorLayout内的View的状态发送了变化,该方法就会执行
* @param parent 顶层父控件CoordinatorLayout
* @param child 我们设置这个Behavior的View
* @param dependency 值会不断的变化,他会轮询CoordinatorLayout下所有所属的子View
* @return 这里判断dependency所属的View是哪一个, 返回true,onDependentViewChanged才执行,否则不执行
*/
@Override
public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency)
/**
* 当被依赖的View状态改变时回调
* @param parent 顶层父控件CoordinatorLayout
* @param child 我们设置这个Behavior的View
* @param dependency 值会不断的变化,他会轮询CoordinatorLayout下所有所属的子View
* @return 当我们改变了child的大小或者位置的时候我们需要返回true
*/
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, View child, View dependency)
/**
* 当被依赖的View移除时回调
* @param parent 顶层父控件CoordinatorLayout
* @param child 我们设置这个Behavior的View
* @param dependency 值会不断的变化,他会轮询CoordinatorLayout下所有所属的子View
*/
@Override
public void onDependentViewRemoved(@NonNull CoordinatorLayout parent, @NonNull View child, @NonNull View dependency)
效果
自定义一个Behavior
public class Demo1Behavior extends CoordinatorLayout.Behavior<View> {
public Demo1Behavior() {
super();
}
public Demo1Behavior(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) {
//这里判断dependency所属的View是哪一个,返回true,onDependentViewChanged才执行,否则不执行
return dependency instanceof AppBarLayout;
}
@Override
public boolean onDependentViewChanged(CoordinatorLayout parent, View child, View dependency) {
/*
*这里获取dependency的top值,也就是AppBarLayout的top,因为AppBarLayout
*在是向上滚出界面的,我们的因为是和AppBarLayout相反,所以取绝对值.
*/
float translationY = Math.abs(dependency.getTop());
child.setTranslationY(translationY);
return true;
}
}
<androidx.coordinatorlayout.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">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="100dp"
android:background="#222222"
android:gravity="center"
android:text="该区域可折叠"
android:textColor="@android:color/white"
android:textSize="30sp"
app:layout_scrollFlags="scroll" />
<TextView
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#DD012D"
android:gravity="center"
android:text="该区域为上滑至头部固定区域"
android:textColor="@android:color/white"
android:textSize="20sp" />
com.google.android.material.appbar.AppBarLayout>
<androidx.core.widget.NestedScrollView
android:id="@+id/rv_demo1_content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<TextView
android:layout_width="match_parent"
android:text="这是一个滚动布局"
android:textSize="200sp"
android:background="#00ff00"
android:layout_height="wrap_content"/>
androidx.core.widget.NestedScrollView>
//行为控制器引用 app:layout_behavior=".demo1.Demo1Behavior"
<TextView
android:layout_gravity="bottom"
app:layout_behavior=".demo1.Demo1Behavior"
android:layout_width="match_parent"
android:background="#ff00ff"
android:layout_height="50dip"/>
androidx.coordinatorlayout.widget.CoordinatorLayout>
防招商银行8.1全部菜单布局,上滑顶部区域隐藏,导航条悬浮,点击导航条可快速定位。
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".demo5.Demo5Activity">
<com.google.android.material.appbar.AppBarLayout
android:id="@+id/abl_demo5_content"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="match_parent"
android:layout_height="100dp"
android:background="#222222"
android:gravity="center"
android:text="该区域可折叠"
android:textColor="@android:color/white"
android:textSize="30sp"
app:layout_scrollFlags="scroll|enterAlwaysCollapsed" />
<com.google.android.material.tabs.TabLayout
android:id="@+id/tb_demo5_content"
android:layout_width="match_parent"
android:layout_height="50dip"
android:background="#ffffff">
com.google.android.material.tabs.TabLayout>
com.google.android.material.appbar.AppBarLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rv_demo5_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
androidx.coordinatorlayout.widget.CoordinatorLayout>
public class Demo5Activity extends AppCompatActivity {
private RecyclerView rv_demo5_content;
private List<Demo5Bean> data;
private TabLayout tb_demo5_content;
private AppBarLayout abl_demo5_content;
private GridLayoutManager gridLayoutManager;
private RecyclerView.SmoothScroller smoothScroller;
private List<Integer> titlePosition;
//是否正在滚动
private boolean isScroll;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_demo5);
tb_demo5_content = findViewById(R.id.tb_demo5_content);
rv_demo5_content = findViewById(R.id.rv_demo5_content);
abl_demo5_content = findViewById(R.id.abl_demo5_content);
initData();
initTabLayout();
initRecyclerView();
}
private void initData() {
data = new ArrayList<Demo5Bean>();
titlePosition = new ArrayList<Integer>();
Demo5Bean bean = null;
for (int i = 0; i < 5; i++) {
bean = new Demo5Bean("标题" + i, Demo5Adapter.VIEW_TYPE_TITLE);
data.add(bean);
titlePosition.add(i + (i * 10));
for (int i1 = 0; i1 < 10; i1++) {
bean = new Demo5Bean(i + "_内容" + i1, Demo5Adapter.VIEW_TYPE_MENU);
data.add(bean);
}
}
}
private void initTabLayout() {
for (Demo5Bean datum : data) {
if (datum.getItemType() == Demo5Adapter.VIEW_TYPE_TITLE) {
tb_demo5_content.addTab(tb_demo5_content.newTab().setText(datum.getName()));
}
}
tb_demo5_content.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
if(!isScroll) {
//收缩折叠区
abl_demo5_content.setExpanded(false);
int tabPosition = tab.getPosition();
int titlePosition = getTitlePosition(tabPosition);
smoothScroller.setTargetPosition(titlePosition);
gridLayoutManager.startSmoothScroll(smoothScroller);
}
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
private void initRecyclerView() {
gridLayoutManager = new GridLayoutManager(this, 4);
gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
@Override
public int getSpanSize(int position) {
if (position < data.size()) {
Demo5Bean bean = data.get(position);
if (bean.getItemType() == Demo5Adapter.VIEW_TYPE_TITLE) {
//是标题则占4个item
return 4;
} else if (bean.getItemType() == Demo5Adapter.VIEW_TYPE_MENU) {
//是menu则正常占用一个item
return 1;
} else {
return 0;
}
} else {
//FooterView 占4个item
return 4;
}
}
});
//计算最后填充FooterView填充高度,全屏高度-状态栏高度-tablayout的高度(这里固定高度50dp)-title标题高度(40)-最后分组高度(3排menu每个70),用于recyclerView的最后一个item FooterView填充高度
int screenH = getScreenHeight();
int statusBarH = getStatusBarHeight(this);
int tabH = dip2px(this,50);
int titleH = dip2px(this,40);
int lastMenusH= dip2px(this,70)*3;
int lastH = screenH - statusBarH - tabH -titleH-lastMenusH;
if(lastH<=0){
lastH=0;
}
Demo5Adapter mAdapter = new Demo5Adapter(data, this,lastH);
rv_demo5_content.setLayoutManager(gridLayoutManager);
rv_demo5_content.setAdapter(mAdapter);
//RecyclerView平滑Scroller
smoothScroller = new LinearSmoothScroller(this) {
@Override
protected int getVerticalSnapPreference() {
return LinearSmoothScroller.SNAP_TO_START;
}
@Nullable
@Override
public PointF computeScrollVectorForPosition(int targetPosition) {
return gridLayoutManager.computeScrollVectorForPosition(targetPosition);
}
};
rv_demo5_content.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if(newState==RecyclerView.SCROLL_STATE_IDLE){
isScroll=false;
}else{
isScroll=true;
}
}
@Override
public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
TabLayout.Tab tabAt = tb_demo5_content.getTabAt(getTabPosition(gridLayoutManager.findFirstVisibleItemPosition()));
if (tabAt != null && !tabAt.isSelected()) {
tabAt.select();
}
}
});
}
private int getTitlePosition(int tabPosition) {
//根据tabPosition找出TitlePosition
return titlePosition.get(tabPosition);
}
private int getTabPosition(int menuPosition) {
return titlePosition.indexOf(menuPosition);
}
private int getScreenHeight() {
return getResources().getDisplayMetrics().heightPixels;
}
public int getStatusBarHeight(Context context) {
int result = 0;
int resourceId = context.getResources()
.getIdentifier("status_bar_height", "dimen", "android");
if (resourceId > 0) {
result = context.getResources().getDimensionPixelSize(resourceId);
}
return result;
}
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
}
public class Demo5Adapter extends RecyclerView.Adapter {
public static final int VIEW_TYPE_TITLE = 0;
public static final int VIEW_TYPE_MENU = 1;
public static final int VIEW_TYPE_FOOTER = 2;
private final LayoutInflater inflater;
private List<Demo5Bean> data;
private Context context;
private int lastH;
public Demo5Adapter(List<Demo5Bean> data, Context context,int lastH) {
this.data = data;
this.context = context;
this.lastH = lastH;
inflater = LayoutInflater.from(context);
}
@Override
public int getItemViewType(int position) {
if (position == data.size()) {
return VIEW_TYPE_FOOTER;
} else {
Demo5Bean demo5Bean = data.get(position);
return demo5Bean.getItemType();
}
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
RecyclerView.ViewHolder viewHolder = null;
switch (viewType) {
case VIEW_TYPE_TITLE:
viewHolder = new Demo5TitleViewHolder(inflater.inflate(R.layout.itme_demo5_title, parent, false));
break;
case VIEW_TYPE_MENU:
viewHolder = new Demo5MenuViewHolder(inflater.inflate(R.layout.itme_demo5_menu, parent, false));
break;
case VIEW_TYPE_FOOTER:
View view = new View(parent.getContext());
view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, lastH));
viewHolder = new Demo5FooterViewHolder(view);
break;
}
return viewHolder;
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
switch (getItemViewType(position)) {
case VIEW_TYPE_TITLE:
((Demo5TitleViewHolder) holder).tv_item_demo5_title.setText(data.get(position).getName());
Log.i("TTT",holder.itemView.getMeasuredHeight()+"VIEW_TYPE_TITLE");
break;
case VIEW_TYPE_MENU:
((Demo5MenuViewHolder) holder).tv_item_demo5_menu.setText(data.get(position).getName());
Log.i("TTT",holder.itemView.getMeasuredHeight()+"VIEW_TYPE_MENU");
break;
}
}
@Override
public int getItemCount() {
return data.size() + 1;
}
public static class Demo5TitleViewHolder extends RecyclerView.ViewHolder {
private final TextView tv_item_demo5_title;
public Demo5TitleViewHolder(@NonNull View itemView) {
super(itemView);
tv_item_demo5_title = itemView.findViewById(R.id.tv_item_demo5_title);
}
}
public static class Demo5MenuViewHolder extends RecyclerView.ViewHolder {
private final TextView tv_item_demo5_menu;
public Demo5MenuViewHolder(@NonNull View itemView) {
super(itemView);
tv_item_demo5_menu = itemView.findViewById(R.id.tv_item_demo5_menu);
}
}
public static class Demo5FooterViewHolder extends RecyclerView.ViewHolder {
public Demo5FooterViewHolder(@NonNull View itemView) {
super(itemView);
}
}
}
public class Demo5Bean {
private String name;
private int itemType;
public Demo5Bean(String name, int itemType) {
this.name = name;
this.itemType = itemType;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getItemType() {
return itemType;
}
public void setItemType(int itemType) {
this.itemType = itemType;
}
}
AppBarLayout代码主动折叠与打开
//打开AppBarLayout
appBarLayout.setExpanded(true);
//关闭AppBarLayout
appBarLayout.setExpanded(false);
源码下载地址:Demo全部代码