Android CoordinatorLayout

作者: Demons_96 | 来源:发表于2020-08-25 22:19 被阅读0次

    CoordinatorLayout 协调布局,可以理解为功能更强大的 FrameLayout 布局。它在普通情况下作用和 FrameLayout 基本一致,通常适用于两种使用方式:第一,最为界面最顶层的装饰布局;第二,作为包含一个或多个子视图的特定交互容器。
    CoordinatorLayout 可以监听其所有子控件的各种事件,然后帮我们做出最为合理的响应。
    下面看一个简单的例子,代码如下。

    <?xml version="1.0" encoding="utf-8"?>
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".TestCoordinatorLayout.TestCoordinatorActivity">
    
        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|end"
            android:layout_margin="16dp"
            android:src="@mipmap/ic_launcher_round" />
    
    </FrameLayout>
    

    在 FrameLayout 布局的右下角放了一个悬浮按钮

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_test_coordinator);
    
            findViewById(R.id.fab).setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Snackbar.make(v, "正在格式化...", Snackbar.LENGTH_SHORT)
                            .setAction("不!", new View.OnClickListener() {
                                @Override
                                public void onClick(View v) {
                                    Toast.makeText(TestCoordinatorActivity.this, "操作已扯回", Toast.LENGTH_SHORT).show();
                                }
                            })
                            .show();
                }
            });
        }
    

    为其添加点击事件,当点击按钮时弹出一个 Snackbar 提示框。

    可以看到如果使用的是普通的 FrameLayout 当父布局则提示框弹出时会有一小部分挡住悬浮按钮, 要是以前可以选择调整 layout_margin 来避免这类情况的发生,但现在有了更优雅的解决方法,只需将布局文件里的 FrameLayout 改成 android.support.design.widget.CoordinatorLayout 即可。

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".TestCoordinatorLayout.TestCoordinatorActivity">
    
        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|end"
            android:layout_margin="16dp"
            android:src="@mipmap/ic_launcher_round" />
    
    </android.support.design.widget.CoordinatorLayout>
    
    • CoordinatorLayout 本身就是一个加强版的 FrameLayout,所以这种替换不会有任何副作用。
    • Snackbar 虽然不是 CoordinatorLayout 的子控件,但是因其在调用时在 make() 里传入了一个 View 对象,这个对象是在浮动按钮的监听事件里获取的,而浮动按钮又是 CoordinatorLayout 中的子控件,所以 Snackbar 也能被其监听到。
    • 修改后的运行效果如下。

    多个视图进行交互操作

    CoordinatorLayout 通过为子控件设置交互行为 Behavior 就可以实现一些特殊的效果,它是 CoordinatorLayout 的一个抽象内部类,实现时需要重写相应的方法。

    • 某个 view 监听另一个 view 的状态变化,例如大小、位置、显示状态
        /**
         * 在此设置需要关注的 view
         * 
         * @param parent     当前的 CoordinatorLayout
         * @param child      设置了 layout_behavior 的 View
         * @param dependency 待观察的 View
         * @return 返回 true 则关注
         */
        @Override
        public boolean layoutDependsOn(@NonNull CoordinatorLayout parent, @NonNull View child, @NonNull View dependency) {
            return super.layoutDependsOn(parent, child, dependency);
        }
    
        /**
         * 当所关注的 view 状态发生改变时调用
         */
        @Override
        public boolean onDependentViewChanged(@NonNull CoordinatorLayout parent, @NonNull View child, @NonNull View dependency) {
            return super.onDependentViewChanged(parent, child, dependency);
        }
    

    下面看一个例子,写一个可移动的 view

    public class MoveView extends View {
        private int lastX;
        private int lastY;
    
        public MoveView(Context context) {
            super(context);
            initView();
        }
    
        public MoveView(Context context, AttributeSet attrs) {
            super(context, attrs);
            initView();
        }
    
        public MoveView(Context context, AttributeSet attrs, int defStyleAttr) {
            super(context, attrs, defStyleAttr);
            initView();
        }
    
        private void initView() {
            setBackgroundColor(Color.BLUE);
        }
    
        // 绝对坐标方式
        @Override
        public boolean onTouchEvent(MotionEvent event) {
            int rawX = (int) (event.getRawX());
            int rawY = (int) (event.getRawY());
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    // 记录触摸点坐标
                    lastX = rawX;
                    lastY = rawY;
                    break;
                case MotionEvent.ACTION_MOVE:
                    // 计算偏移量
                    int offsetX = rawX - lastX;
                    int offsetY = rawY - lastY;
                    // 在当前left、top、right、bottom的基础上加上偏移量
                    layout(getLeft() + offsetX,
                            getTop() + offsetY,
                            getRight() + offsetX,
                            getBottom() + offsetY);
                    // 重新设置初始坐标
                    lastX = rawX;
                    lastY = rawY;
                    break;
            }
            return true;
        }
    }
    

    修改之前的布局

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".TestCoordinatorLayout.TestCoordinatorActivity">
    
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="标题" />
    
        <cn.demon96.androidintensify.TestCoordinatorLayout.MoveView
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:layout_gravity="center|right"
            android:layout_margin="16dp" />
    
        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|end"
            android:layout_margin="16dp"
            android:src="@mipmap/ic_launcher_round" />
    
    </android.support.design.widget.CoordinatorLayout>
    

    运行后滑动蓝色方块,效果如下。

    现在新建一个 DependentBehavior 类并继承 CoordinatorLayout.Behavior

    public class DependentBehavior extends CoordinatorLayout.Behavior<View> {
    
        public DependentBehavior(Context context, AttributeSet attrs) {
            super(context, attrs);
        }
    
        @Override
        public boolean layoutDependsOn(@NonNull CoordinatorLayout parent, @NonNull View child, @NonNull View dependency) {
            // 观察自定义的 MoveView 的移动
            return dependency instanceof MoveView;
        }
    
        @Override
        public boolean onDependentViewChanged(@NonNull CoordinatorLayout parent, @NonNull View child, @NonNull View dependency) {
            int offset = dependency.getTop() - child.getTop();
            ViewCompat.offsetTopAndBottom(child, offset);
            return true;
        }
    }
    
    

    在想要实现联动效果的 view 的 xml 代码中加上 app:layout_behavior="自定义 Behavior 的包名. 自定义 Behavior"

    <?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"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".TestCoordinatorLayout.TestCoordinatorActivity">
    
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="标题"
            app:layout_behavior="cn.demon96.androidintensify.TestCoordinatorLayout.DependentBehavior" />
    
        ......
    </android.support.design.widget.CoordinatorLayout>
    

    运行效果如下

    书中例子

    Activity

    public class CoordinatorMainActivity extends AppCompatActivity {
    
        // 控制ToolBar的变量
        private static final float PERCENTAGE_TO_SHOW_TITLE_AT_TOOLBAR = 0.9f;
        private static final float PERCENTAGE_TO_HIDE_TITLE_DETAILS = 0.3f;
    
        private static final int ALPHA_ANIMATIONS_DURATION = 200;
    
        private boolean mIsTheTitleVisible = false;
        private boolean mIsTheTitleContainerVisible = true;
    
        @Bind(R.id.main_iv_placeholder)
        ImageView mIvPlaceholder; // 大图片
    
        @Bind(R.id.main_ll_title_container)
        LinearLayout mLlTitleContainer; // Title的LinearLayout
    
        @Bind(R.id.main_fl_title)
        FrameLayout mFlTitleContainer; // Title的FrameLayout
    
        @Bind(R.id.main_abl_app_bar)
        AppBarLayout mAblAppBar; // 整个可以滑动的AppBar
    
        @Bind(R.id.main_tv_toolbar_title)
        TextView mTvToolbarTitle; // 标题栏Title
    
        @Bind(R.id.main_tb_toolbar)
        Toolbar mTbToolbar; // 工具栏
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_coordinator_main);
            ButterKnife.bind(this);
    
            mTbToolbar.setTitle("");
    
            // 向上或向下滑动AppBar就会触发监听
            mAblAppBar.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
                @Override
                public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
                    int maxScroll = appBarLayout.getTotalScrollRange();
                    float percentage = (float) Math.abs(verticalOffset) / (float) maxScroll;
                    handleAlphaOnTitle(percentage);
                    handleToolbarTitleVisibility(percentage);
                }
            });
    
            initParallaxValues(); // 设置自动滑动(视差)效果
        }
    
        // 设置自动滑动(视差)效果
        private void initParallaxValues() {
            CollapsingToolbarLayout.LayoutParams petDetailsLp =
                    (CollapsingToolbarLayout.LayoutParams) mIvPlaceholder.getLayoutParams();
    
            CollapsingToolbarLayout.LayoutParams petBackgroundLp =
                    (CollapsingToolbarLayout.LayoutParams) mFlTitleContainer.getLayoutParams();
    
            petDetailsLp.setParallaxMultiplier(0.9f);
            petBackgroundLp.setParallaxMultiplier(0.3f);
    
            mIvPlaceholder.setLayoutParams(petDetailsLp);
            mFlTitleContainer.setLayoutParams(petBackgroundLp);
        }
    
        // 处理ToolBar的显示
        private void handleToolbarTitleVisibility(float percentage) {
            if (percentage >= PERCENTAGE_TO_SHOW_TITLE_AT_TOOLBAR) {
                if (!mIsTheTitleVisible) {
                    startAlphaAnimation(mTvToolbarTitle, ALPHA_ANIMATIONS_DURATION, View.VISIBLE);
                    mIsTheTitleVisible = true;
                }
            } else {
                if (mIsTheTitleVisible) {
                    startAlphaAnimation(mTvToolbarTitle, ALPHA_ANIMATIONS_DURATION, View.INVISIBLE);
                    mIsTheTitleVisible = false;
                }
            }
        }
    
        // 控制Title的显示
        private void handleAlphaOnTitle(float percentage) {
            if (percentage >= PERCENTAGE_TO_HIDE_TITLE_DETAILS) {
                if (mIsTheTitleContainerVisible) {
                    startAlphaAnimation(mLlTitleContainer, ALPHA_ANIMATIONS_DURATION, View.INVISIBLE);
                    mIsTheTitleContainerVisible = false;
                }
            } else {
                if (!mIsTheTitleContainerVisible) {
                    startAlphaAnimation(mLlTitleContainer, ALPHA_ANIMATIONS_DURATION, View.VISIBLE);
                    mIsTheTitleContainerVisible = true;
                }
            }
        }
    
        // 设置渐变的动画
        public static void startAlphaAnimation(View v, long duration, int visibility) {
            AlphaAnimation alphaAnimation = (visibility == View.VISIBLE)
                    ? new AlphaAnimation(0f, 1f)
                    : new AlphaAnimation(1f, 0f);
    
            alphaAnimation.setDuration(duration);
            alphaAnimation.setFillAfter(true);
            v.startAnimation(alphaAnimation);
        }
    }
    

    布局代码

    <?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"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".TestCoordinatorLayout.CoordinatorMainActivity">
    
        <android.support.design.widget.AppBarLayout
            android:id="@+id/main_abl_app_bar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
    
            <android.support.design.widget.CollapsingToolbarLayout
                android:layout_width="match_parent"
                android:layout_height="500dp"
                app:layout_scrollFlags="scroll|snap">
    
                <ImageView
                    android:id="@+id/main_iv_placeholder"
                    android:layout_width="match_parent"
                    android:layout_height="300dp"
                    android:scaleType="centerCrop"
                    android:src="@drawable/large"
                    app:layout_collapseMode="parallax" />
    
                <FrameLayout
                    android:id="@+id/main_fl_title"
                    android:layout_width="match_parent"
                    android:layout_height="150dp"
                    android:layout_gravity="bottom|center_horizontal"
                    android:background="@color/colorPrimary"
                    app:layout_collapseMode="parallax">
    
                    <LinearLayout
                        android:id="@+id/main_ll_title_container"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_gravity="bottom|center"
                        android:layout_marginBottom="40dp"
                        android:orientation="vertical">
    
                        <TextView
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_gravity="center_horizontal"
                            android:layout_marginTop="@dimen/title_margin"
                            android:gravity="bottom|center"
                            android:text="@string/person_name"
                            android:textColor="@android:color/white"
                            android:textSize="30sp" />
    
                        <TextView
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_gravity="center_horizontal"
                            android:layout_marginTop="4dp"
                            android:text="@string/person_title"
                            android:textColor="@android:color/white" />
                    </LinearLayout>
                </FrameLayout>
            </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"
            android:scrollbars="none"
            app:behavior_overlapTop="30dp"
            app:layout_behavior="@string/appbar_scrolling_view_behavior">
    
            <android.support.v7.widget.CardView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="8dp"
                app:cardElevation="8dp"
                app:contentPadding="16dp">
    
                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:lineSpacingExtra="8dp"
                    android:text="@string/person_intro" />
            </android.support.v7.widget.CardView>
        </android.support.v4.widget.NestedScrollView>
    
        <android.support.v7.widget.Toolbar
            android:id="@+id/main_tb_toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="@color/colorPrimary"
            app:layout_anchor="@id/main_fl_title">
    
            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:orientation="horizontal">
    
                <Space
                    android:layout_width="@dimen/image_final_width"
                    android:layout_height="@dimen/image_final_width" />
    
                <TextView
                    android:id="@+id/main_tv_toolbar_title"
                    android:layout_width="wrap_content"
                    android:layout_height="match_parent"
                    android:layout_marginLeft="8dp"
                    android:gravity="center_vertical"
                    android:text="@string/person_name"
                    android:textColor="@android:color/white"
                    android:textSize="20sp"
                    android:visibility="invisible" />
            </LinearLayout>
        </android.support.v7.widget.Toolbar>
    
        <de.hdodenhof.circleimageview.CircleImageView
            android:layout_width="@dimen/image_width"
            android:layout_height="@dimen/image_width"
            android:layout_gravity="center"
            android:src="@drawable/small"
            app:civ_border_color="@android:color/white"
            app:civ_border_width="2dp"
            app:layout_behavior=".TestCoordinatorLayout.AvatarImageBehavior" />
    
    </android.support.design.widget.CoordinatorLayout>
    
    

    Behavior

    public class AvatarImageBehavior extends CoordinatorLayout.Behavior<CircleImageView> {
    
        private final static float MIN_AVATAR_PERCENTAGE_SIZE = 0.3f;
        private final static int EXTRA_FINAL_AVATAR_PADDING = 80;
    
        private int mStartYPosition; // 起始的Y轴位置
        private int mFinalYPosition; // 结束的Y轴位置
        private int mStartHeight; // 开始的图片高度
        private int mFinalHeight; // 结束的图片高度
        private int mStartXPosition; // 起始的X轴高度
        private int mFinalXPosition; // 结束的X轴高度
        private float mStartToolbarPosition; // Toolbar的起始位置
    
        private final Context mContext;
        private float mAvatarMaxSize;
    
        public AvatarImageBehavior(Context context, AttributeSet attrs) {
            mContext = context;
            init();
        }
    
        private void init() {
            bindDimensions();
        }
    
        private void bindDimensions() {
            mAvatarMaxSize = mContext.getResources().getDimension(R.dimen.image_width);
        }
    
    
        @Override
        public boolean layoutDependsOn(CoordinatorLayout parent, CircleImageView child, View dependency) {
            return dependency instanceof Toolbar;  // 依赖Toolbar控件
        }
    
        @Override
        public boolean onDependentViewChanged(CoordinatorLayout parent, CircleImageView child, View dependency) {
            shouldInitProperties(child, dependency);  // 初始化属性
            final int maxScrollDistance = (int) (mStartToolbarPosition - getStatusBarHeight());  // 最大滑动距离: 起始位置-状态栏高度
            float expandedPercentageFactor = dependency.getY() / maxScrollDistance;  // 滑动的百分比
    
            float distanceYToSubtract = ((mStartYPosition - mFinalYPosition)
                    * (1f - expandedPercentageFactor)) + (child.getHeight() / 2);  // Y轴距离
            float distanceXToSubtract = ((mStartXPosition - mFinalXPosition)
                    * (1f - expandedPercentageFactor)) + (child.getWidth() / 2);  // X轴距离
    
            float heightToSubtract = ((mStartHeight - mFinalHeight) * (1f - expandedPercentageFactor)); // 高度减小
    
            // 设置图片位置
            child.setY(mStartYPosition - distanceYToSubtract);
            child.setX(mStartXPosition - distanceXToSubtract);
    
            // 设置图片大小
            CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) child.getLayoutParams();
            lp.width = (int) (mStartHeight - heightToSubtract);
            lp.height = (int) (mStartHeight - heightToSubtract);
            child.setLayoutParams(lp);
    
            return true;
        }
    
        /**
         * 初始化动画值
         *
         * @param child      图片控件
         * @param dependency ToolBar
         */
        private void shouldInitProperties(CircleImageView child, View dependency) {
            if (mStartXPosition == 0)  // 图片控件水平中心
                mStartXPosition = (int) (child.getX() + (child.getWidth() / 2));
            if (mFinalXPosition == 0)  // 边缘+缩略图宽度的一半
                mFinalXPosition = mContext.getResources().getDimensionPixelOffset(R.dimen.abc_action_bar_content_inset_material) + (mFinalHeight / 2);
    
            if (mStartYPosition == 0)  // 图片控件竖直中心
                mStartYPosition = (int) (child.getY() + (child.getHeight() / 2));
            if (mFinalYPosition == 0)  // Toolbar中心
                mFinalYPosition = (dependency.getHeight() / 2);
    
            if (mStartHeight == 0)  // 图片高度
                mStartHeight = child.getHeight();
            if (mFinalHeight == 0)  // Toolbar缩略图高度
                mFinalHeight = mContext.getResources().getDimensionPixelOffset(R.dimen.image_final_width);
    
            if (mStartToolbarPosition == 0)  // Toolbar的起始位置
                mStartToolbarPosition = dependency.getY() + (dependency.getHeight() / 2);
        }
    
        // 获取状态栏高度
        public int getStatusBarHeight() {
            int result = 0;
            int resourceId = mContext.getResources().getIdentifier("status_bar_height", "dimen", "android");
    
            if (resourceId > 0) {
                result = mContext.getResources().getDimensionPixelSize(resourceId);
            }
            return result;
        }
    }
    

    运行效果

    一个简单的例子

    <?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.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="200dp"
            android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
    
            <android.support.design.widget.CollapsingToolbarLayout
                android:layout_width="match_parent"
                android:layout_height="170dp"
                app:contentScrim="@color/colorAccent"
                app:expandedTitleMarginBottom="100dp"
                app:layout_scrollFlags="scroll|exitUntilCollapsed"
                app:title="我是collapsebar的标题">
    
                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="第一个固定(pin)"
                    android:textSize="40sp"
                    app:layout_collapseMode="pin" />
    
                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:text="不设置,跟随滑动"
                    android:textSize="40sp" />
    
                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_gravity="bottom"
                    android:text="视察效果(parallax)"
                    android:textSize="40sp"
                    app:layout_collapseMode="parallax" />
    
                <android.support.v7.widget.Toolbar
                    android:layout_width="match_parent"
                    android:layout_height="30dp"
                    android:layout_gravity="top"
                    android:background="#600f"
                    app:layout_collapseMode="pin">
    
                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="我是toolbar" />
                </android.support.v7.widget.Toolbar>
            </android.support.design.widget.CollapsingToolbarLayout>
    
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="appbar之内,collap之外"
                android:textColor="#0f0" />
        </android.support.design.widget.AppBarLayout>
    
        <android.support.v4.widget.NestedScrollView
            android:id="@+id/n_scroll_view"
            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="wrap_content"
                android:orientation="vertical">
    
                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="哈"
                    android:textColor="#0f0"
                    android:textSize="200sp" />
    
                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="哈"
                    android:textColor="#0f0"
                    android:textSize="200sp" />
    
                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="哈"
                    android:textColor="#0f0"
                    android:textSize="200sp" />
    
                <TextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="哈"
                    android:textColor="#0f0"
                    android:textSize="200sp" />
            </LinearLayout>
        </android.support.v4.widget.NestedScrollView>
    </android.support.design.widget.CoordinatorLayout>
    

    参考

    1. 《Android开发强化实践》
    2. 《第一行代码(第二版)》
    3. 《Android群英传》
    4. CoordinatorLayout高级用法-自定义Behavior
      看完这篇完全可以开发5.0的高级特效了

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