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CoordinatorLayout源码解析:Behavior 的加载与实例化过程

CoordinatorLayout源码解析:Behavior 的加载与实例化过程

本文基于 AndroidX CoordinatorLayout 源码,剖析 Behavior 从 XML 定义到内存对象的完整解析链路。

引言

在 Android 开发中,CoordinatorLayout 堪称最神奇的布局之一。它之所以强大,核心就在于 Behavior 机制——通过将交互行为解耦到独立的 Behavior 类中,实现了子视图之间的协调联动。但你是否思考过:当我们写下 app:layout_behavior=".MyBehavior"这行代码时,背后究竟发生了什么?Behavior 是在什么时候、通过什么方式被创建出来的?

本文将带你从源码角度,完整追踪 Behavior 的解析与实例化全过程。Behavior 的解析并非一蹴而就,而是沿着一条精心设计的调用链逐步完成。这条链路的核心节点如下:

onMeasure() 
    → prepareChildren() 
        → getResolvedLayoutParams() 
            → 解析 @DefaultBehavior 注解 或 AttachedBehavior 接口
    → LayoutParams 构造函数 
        → parseBehavior() 
            → 类名补全规则
            → 反射构造器缓存
            → 创建 Behavior 实例
    → Behavior.onAttachedToLayoutParams()

onMeasure 中的 prepareChildren

当CoordinatorLayout布局需要测量时,系统会调用onMeasure这个方法,而它做的第一件事就是调用 prepareChildren

@Override
protected
 void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    prepareChildren();  // 入口点!
    ensurePreDrawListener();
    // ... 后续测量逻辑

}

prepareChildren方法承担着重要的初始化工作——它不仅构建子视图的依赖关系图,还会确保每个子视图的 Behavior 已经被正确解析:

private void prepareChildren() {
    mDependencySortedChildren.clear();
    mChildDag.clear();

    for
 (int i = 0, count = getChildCount(); i < count; i++) {
        final
 View view = getChildAt(i);

        // 关键调用:获取已解析的 LayoutParams

        final
 LayoutParams lp = getResolvedLayoutParams(view);

        // 查找锚点视图

        lp.findAnchorView(this, view);

        // 构建依赖关系图

        mChildDag.addNode(view);
        // ... 添加依赖边

    }
    // ... 排序等操作

}

这里最关键的一行是 getResolvedLayoutParams(view),它是 Behavior 解析的真正入口。继续看getResolvedLayoutParams 的解析逻辑:

LayoutParams getResolvedLayoutParams(View child) {
    final
 LayoutParams result = (LayoutParams) child.getLayoutParams();

    // 如果 Behavior 尚未解析

    if
 (!result.mBehaviorResolved) {

        // 检查是否实现了 AttachedBehavior 接口(推荐方式)

        if
 (child instanceof AttachedBehavior) {
            Behavior
 attachedBehavior = ((AttachedBehavior) child).getBehavior();
            if
 (attachedBehavior == null) {
                Log.e(TAG, "Attached behavior class is null");
            }
            result.setBehavior(attachedBehavior);
            result.mBehaviorResolved = true;

        } else {
            // 检查 @DefaultBehavior 注解(已废弃,仅作兼容)

            Class<?> childClass = child.getClass();
            DefaultBehavior
 defaultBehavior = null;

            // 向上遍历父类,查找注解

            while
 (childClass != null
                    && (defaultBehavior = childClass.getAnnotation(DefaultBehavior.class)) == null) {
                childClass = childClass.getSuperclass();
            }

            if
 (defaultBehavior != null) {
                try
 {
                    // 通过无参构造函数实例化

                    result.setBehavior(
                            defaultBehavior.value().getDeclaredConstructor().newInstance());
                } catch (Exception e) {
                    Log.e(TAG, "Default behavior class " + defaultBehavior.value().getName()
                            + " could not be instantiated.", e);
                }
            }
            result.mBehaviorResolved = true;
        }
    }
    return
 result;
}

这个方法揭示了 Behavior 的两种"备用"获取方式:

  1. 1. AttachedBehavior 接口(推荐):View 自己提供一个 Behavior
  2. 2. @DefaultBehavior 注解(已废弃):通过注解指定默认 Behavior

需要注意的是,这里处理的仅仅是"默认"行为。如果我们是通过 XML 的 layout_behavior属性指定的 Behavior,此时 mBehaviorResolved已经是 true 了——因为它在 LayoutParams 构造时就已经解析完成。

LayoutParams 的构造函数

真正解析 XML 中 layout_behavior的地方,是在 LayoutParams 的构造方法中:

LayoutParams(@NonNull Context context, @Nullable AttributeSet attrs) {
    super
(context, attrs);

    TypedArray
 a = context.obtainStyledAttributes(attrs,
            R.styleable.CoordinatorLayout_Layout);

    // 解析基本属性

    this
.gravity = a.getInteger(
            R.styleable.CoordinatorLayout_Layout_android_layout_gravity,
            Gravity.NO_GRAVITY);
    mAnchorId = a.getResourceId(R.styleable.CoordinatorLayout_Layout_layout_anchor,
            View.NO_ID);

    // 关键:检查是否有 layout_behavior 属性

    mBehaviorResolved = a.hasValue(
            R.styleable.CoordinatorLayout_Layout_layout_behavior);

    if
 (mBehaviorResolved) {
        // 核心:解析 behavior 字符串并创建 Behavior 实例

        mBehavior = parseBehavior(context, attrs, a.getString(
                R.styleable.CoordinatorLayout_Layout_layout_behavior));
    }
    a.recycle();

    if
 (mBehavior != null) {
        // 通知 Behavior 已被附加

        mBehavior.onAttachedToLayoutParams(this);
    }
}

这里有两个关键点:

  1. 1. mBehaviorResolved标记了是否通过 XML 指定了 Behavior
  2. 2. parseBehavior方法完成了从字符串到对象的转换

parseBehavior是整个 Behavior 解析机制中最精彩的部分,它处理了类名补全、反射缓存等复杂逻辑:

static Behavior parseBehavior(Context context, AttributeSet attrs, String name) {
    if
 (TextUtils.isEmpty(name)) {
        return
 null;
    }

    // 第一步:类名补全(处理简写形式)

    final
 String fullName;
    if
 (name.startsWith(".")) {
        // 相对包名:在当前应用包名后追加

        // 例如:".MyBehavior" -> "com.example.app.MyBehavior"

        fullName = context.getPackageName() + name;

    } else if (name.indexOf('.') >= 0) {
        // 完整包名:直接使用

        // 例如:"com.example.MyBehavior"

        fullName = name;

    } else {
        // 无包名:使用默认的 Behavior 包名

        // 例如:"MyBehavior" -> "androidx.coordinatorlayout.widget.MyBehavior"

        fullName = !TextUtils.isEmpty(WIDGET_PACKAGE_NAME)
                ? (WIDGET_PACKAGE_NAME + '.' + name)
                : name;
    }

    try
 {
        // 第二步:使用 ThreadLocal 缓存 Constructor,避免重复反射

        Map<String, Constructor<Behavior>> constructors = sConstructors.get();
        if
 (constructors == null) {
            constructors = new HashMap<>();
            sConstructors.set(constructors);
        }

        // 从缓存中获取 Constructor

        Constructor<Behavior> c = constructors.get(fullName);
        if
 (c == null) {
            // 反射获取 Behavior 类

            final
 Class<Behavior> clazz =
                    (Class<Behavior>) Class.forName(fullName, false, context.getClassLoader());

            // 获取带有 (Context, AttributeSet) 参数的构造函数

            c = clazz.getConstructor(CONSTRUCTOR_PARAMS);
            c.setAccessible(true);

            // 存入缓存

            constructors.put(fullName, c);
        }

        // 第三步:创建 Behavior 实例,传入 context 和 attrs

        return
 c.newInstance(context, attrs);

    } catch (Exception e) {
        throw
 new RuntimeException("Could not inflate Behavior subclass " + fullName, e);
    }
}

为了更清晰地理解类名补全规则,这里用一个表格总结:

XML 中写法
示例
解析后的完整类名
完整包名
com.example.MyBehaviorcom.example.MyBehavior
以点开头
.MyBehavior应用包名.MyBehavior
无点号
MyBehaviorandroidx.coordinatorlayout.widget.MyBehavior

这种设计使得开发者可以用最简洁的方式指定常见 Behavior,同时保留使用自定义包名的灵活性。

注意到 sConstructors是一个 ThreadLocal<Map<String, Constructor<Behavior>>>,这意味着每个线程都有自己独立的构造器缓存。这种设计考虑到了:

  1. 1. 避免重复反射:同一个 Behavior 类只需反射一次
  2. 2. 线程安全:每个线程独立缓存,无需同步
  3. 3. 内存友好:线程销毁时缓存自动回收

生命周期回调:onAttachedToLayoutParams

当 Behavior 实例创建完成后,还有一个重要的步骤——调用 onAttachedToLayoutParams方法:

if (mBehavior != null) {
    // 通知 Behavior 已被附加到 LayoutParams

    mBehavior.onAttachedToLayoutParams(this);
}

这给了 Behavior 一个初始化的机会,比如从 AttributeSet 中解析自定义属性:

public static class MyBehavior extends CoordinatorLayout.Behavior<View> {

    private
 int customParam;

    public
 MyBehavior(Context context, AttributeSet attrs) {
        super
(context, attrs);
        if
 (attrs != null) {
            TypedArray
 a = context.obtainStyledAttributes(attrs, R.styleable.MyBehavior);
            customParam = a.getInt(R.styleable.MyBehavior_customParam, 0);
            a.recycle();
        }
    }

    @Override

    public
 void onAttachedToLayoutParams(@NonNull CoordinatorLayout.LayoutParams params) {
        super
.onAttachedToLayoutParams(params);
        // 初始化操作

    }
}

完整的解析流程图

parseBehavior

示例:不同配置方式的源码表现

为了更清楚地理解,来看三种不同配置方式在源码层面的表现:

方式一:XML 中指定 layout_behavior

<androidx.recyclerview.widget.RecyclerView
    android:layout_width
="match_parent"
    android:layout_height
="match_parent"
    app:layout_behavior
=".MyCustomBehavior" />

源码路径:LayoutParams 构造函数 → parseBehavior → 设置 mBehavior

方式二:实现 AttachedBehavior 接口

public class MyCustomView extends View implements CoordinatorLayout.AttachedBehavior {
    @NonNull

    @Override

    public
 CoordinatorLayout.Behavior getBehavior() {
        return
 new MyCustomBehavior();
    }
}

源码路径:getResolvedLayoutParams → child instanceof AttachedBehavior → getBehavior()

除了上面是我们自定义的View,常用的系统定义的View,比如AppBarLayout也是采用这种方式的:

AppBarLayout

方式三:使用 @DefaultBehavior 注解(已废弃)

@DefaultBehavior(MyCustomBehavior.class)
public
 class MyCustomView extends View {
}

源码路径:getResolvedLayoutParams → 查找注解 → 反射实例化

总结

通过源码追踪,可以得出以下结论:

  1. 1. 解析时机:Behavior 的解析发生在两个阶段——XML 布局填充时的 LayoutParams 构造函数,以及测量前的 getResolvedLayoutParams 方法。
  2. 2. 优先级规则
    • • XML 中显式指定的 layout_behavior优先级最高
    • • 其次是通过 AttachedBehavior接口提供的 Behavior
    • • 最后才是通过 @DefaultBehavior注解指定的 Behavior
  3. 3. 生命周期:Behavior 创建后会立即收到 onAttachedToLayoutParams回调,可以在此进行初始化。

理解了 Behavior 的解析机制,就能更好地掌握 CoordinatorLayout 的工作原理,在遇到问题时也能快速定位——是 Behavior 没配置上?还是类名写错了?还是构造函数出了问题?希望这篇文章能帮助你更好的了解 CoordinatorLayout 。

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  1. CONNECT:[ UseTime:0.000604s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000811s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000334s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000325s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000516s ]
  6. SELECT * FROM `set` [ RunTime:0.000206s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000603s ]
  8. SELECT * FROM `article` WHERE `id` = 648933 LIMIT 1 [ RunTime:0.000539s ]
  9. UPDATE `article` SET `lasttime` = 1779435907 WHERE `id` = 648933 [ RunTime:0.001866s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000262s ]
  11. SELECT * FROM `article` WHERE `id` < 648933 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000416s ]
  12. SELECT * FROM `article` WHERE `id` > 648933 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000405s ]
  13. SELECT * FROM `article` WHERE `id` < 648933 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001047s ]
  14. SELECT * FROM `article` WHERE `id` < 648933 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000920s ]
  15. SELECT * FROM `article` WHERE `id` < 648933 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005788s ]
0.094230s