Android View 源码解析（二）
来源：互联网 发布：网络大病众筹 编辑：程序博客网 时间：2024/06/07 13:27
民主万岁！
———-共和万岁！
———- 我的上一篇博客就开始研究View的源码，上一篇主要把View的注释部分解释完，说实话，Google的工程师还是非常负责任的。代码写的非常严谨，而且可读性也是非常高。注释很全面，这是我以后要学习的啊。没想到大神写代码也是这么的一丝不苟。佩服佩服。
说是话这项工作的还是非常浩大的，记得以前看到view的源码也就是大概13000行，现在已经不知不觉的增加到21100行，这说明，大神们比我们还努力啊。生活不易啊，比我优秀的人，永远比我更努力。吾等屌丝简直没有活路了啊。
话不多说我们开始死磕。
我们先看一下view类的结构。我们先不看View中的内部类和接口，而是先看它的继承关系和实现关系。
从结构上我们可以看到，view类实现了三个接口。
我们先看一下这三个接口 ,如下图所示。我们先不去管接口的实现。只是先讲类的结构。当然这也是一个学习方法。好了我们看他的属性。好在Google大神的注释都是非常齐全的要不然的话我看起来也是非常吃力的。在此还是再次感谢Google大神。开源万岁！
我们先看一下这三个接口 ,如下图所示。我们先不去管接口的实现。只是先讲类的结构。当然这也是一个学习方法。好了我们看他的属性。好在Google大神的注释都是非常齐全的要不然的话我看起来也是非常吃力的。在此还是再次感谢Google大神。开源万岁！
/** * The logging tag used by this class with android.util.Log. * log的名字 */ protected static final String VIEW_LOG_TAG = "View"; /** * When set to true, apps will draw debugging information about their layouts. *当设置为true时，应用程序将绘制有关其布局的调试信息。 * @hide */ public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; /** * When set to true, this view will save its attribute data. * 当设置为true时，View将保存其属性数据 * @hide */ public static boolean mDebugViewAttributes = false; /** * Used to mark a View that has no ID. * 标记没有Id的View */ public static final int NO_ID = -1; /** * Signals that compatibility booleans have been initialized according to * target SDK versions. * 根据当前初始化的version 给出合适的boolean */ private static boolean sCompatibilityDone = false; /** * Use the old (broken) way of building MeasureSpecs. * 使用旧的）方法建立MeasureSpecs。 */ private static boolean sUseBrokenMakeMeasureSpec = false; /** * Ignore any optimizations using the measure cache. * 忽略测量优化 */ private static boolean sIgnoreMeasureCache = false; /** * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when * calling setFlags. * 当前view不想要任何的按键操作使用TAKES_FOCUS_MASK 调用这个标记 */ private static final int NOT_FOCUSABLE = 0x00000000; /** * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling * setFlags. * 当前view想要按键操作使用TAKES_FOCUS_MASK 调用这个标记 */ private static final int FOCUSABLE = 0x00000001; /** * Mask for use with setFlags indicating bits used for focus. * 表名有焦点的标志位 */ private static final int FOCUSABLE_MASK = 0x00000001; /** * This view will adjust its padding to fit sytem windows (e.g. status bar) * view将根据系统window改变 */ private static final int FITS_SYSTEM_WINDOWS = 0x00000002; /* * VISIBLE *INVISIBLE *GONE * 资源 / /** @hide */ @IntDef({VISIBLE, INVISIBLE, GONE}) @Retention(RetentionPolicy.SOURCE) public @interface Visibility {} /** * This view is visible. * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code * android:visibility}. */ public static final int VISIBLE = 0x00000000; /** * This view is invisible, but it still takes up space for layout purposes. * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code * android:visibility}. */ public static final int INVISIBLE = 0x00000004; /** * This view is invisible, and it doesn't take any space for layout * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code * android:visibility}. */ public static final int GONE = 0x00000008; /** * Mask for use with setFlags indicating bits used for visibility. * {@hide} */ static final int VISIBILITY_MASK = 0x0000000C; private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; /** * This view is enabled. Interpretation varies by subclass. * Use with ENABLED_MASK when calling setFlags. * {@hide} */ static final int ENABLED = 0x00000000; /** * This view is disabled. Interpretation varies by subclass. * Use with ENABLED_MASK when calling setFlags. * {@hide} */ static final int DISABLED = 0x00000020; /** * Mask for use with setFlags indicating bits used for indicating whether * this view is enabled * {@hide} */ static final int ENABLED_MASK = 0x00000020; /** * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be * called and further optimizations will be performed. It is okay to have * this flag set and a background. Use with DRAW_MASK when calling setFlags. * {@hide} */ static final int WILL_NOT_DRAW = 0x00000080; /** * Mask for use with setFlags indicating bits used for indicating whether * this view is will draw * {@hide} */ static final int DRAW_MASK = 0x00000080; /** * <p>This view doesn't show scrollbars.</p> * {@hide} */ static final int SCROLLBARS_NONE = 0x00000000; /** * <p>This view shows horizontal scrollbars.</p> * {@hide} */ static final int SCROLLBARS_HORIZONTAL = 0x00000100; /** * <p>This view shows vertical scrollbars.</p> * {@hide} */ static final int SCROLLBARS_VERTICAL = 0x00000200; /** * <p>Mask for use with setFlags indicating bits used for indicating which * scrollbars are enabled.</p> * {@hide} */ static final int SCROLLBARS_MASK = 0x00000300; /** * Indicates that the view should filter touches when its window is obscured. * Refer to the class comments for more information about this security feature. * {@hide} */ static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; /** * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate * that they are optional and should be skipped if the window has * requested system UI flags that ignore those insets for layout. */ static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; /** * <p>This view doesn't show fading edges.</p> * {@hide} */ static final int FADING_EDGE_NONE = 0x00000000; /** * <p>This view shows horizontal fading edges.</p> * {@hide} */ static final int FADING_EDGE_HORIZONTAL = 0x00001000; /** * <p>This view shows vertical fading edges.</p> * {@hide} */ static final int FADING_EDGE_VERTICAL = 0x00002000; /** * <p>Mask for use with setFlags indicating bits used for indicating which * fading edges are enabled.</p> * {@hide} */ static final int FADING_EDGE_MASK = 0x00003000; /** * <p>Indicates this view can be clicked. When clickable, a View reacts * to clicks by notifying the OnClickListener.<p> * {@hide} */ static final int CLICKABLE = 0x00004000; /** * <p>Indicates this view is caching its drawing into a bitmap.</p> * {@hide} */ static final int DRAWING_CACHE_ENABLED = 0x00008000; /** * <p>Indicates that no icicle should be saved for this view.<p> * {@hide} */ static final int SAVE_DISABLED = 0x000010000; /** * <p>Mask for use with setFlags indicating bits used for the saveEnabled * property.</p> * {@hide} */ static final int SAVE_DISABLED_MASK = 0x000010000; /** * <p>Indicates that no drawing cache should ever be created for this view.<p> * {@hide} */ static final int WILL_NOT_CACHE_DRAWING = 0x000020000; /** * <p>Indicates this view can take / keep focus when int touch mode.</p> * {@hide} */ static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; /** @hide */ @Retention(RetentionPolicy.SOURCE) @IntDef({DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH, DRAWING_CACHE_QUALITY_AUTO}) public @interface DrawingCacheQuality {} /** * <p>Enables low quality mode for the drawing cache.</p> */ public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; /** * <p>Enables high quality mode for the drawing cache.</p> */ public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; /** * <p>Enables automatic quality mode for the drawing cache.</p> */ public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH }; /** * <p>Mask for use with setFlags indicating bits used for the cache * quality property.</p> * {@hide} */ static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; /** * <p> * Indicates this view can be long clicked. When long clickable, a View * reacts to long clicks by notifying the OnLongClickListener or showing a * context menu. * </p> * {@hide} */ static final int LONG_CLICKABLE = 0x00200000; /** * <p>Indicates that this view gets its drawable states from its direct parent * and ignores its original internal states.</p> * * @hide */ static final int DUPLICATE_PARENT_STATE = 0x00400000; /** @hide */ @IntDef({ SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, SCROLLBARS_OUTSIDE_OVERLAY, SCROLLBARS_OUTSIDE_INSET }) @Retention(RetentionPolicy.SOURCE) public @interface ScrollBarStyle {} /** * The scrollbar style to display the scrollbars inside the content area, * without increasing the padding. The scrollbars will be overlaid with * translucency on the view's content. */ public static final int SCROLLBARS_INSIDE_OVERLAY = 0; /** * The scrollbar style to display the scrollbars inside the padded area, * increasing the padding of the view. The scrollbars will not overlap the * content area of the view. */ public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; /** * The scrollbar style to display the scrollbars at the edge of the view, * without increasing the padding. The scrollbars will be overlaid with * translucency. */ public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; /** * The scrollbar style to display the scrollbars at the edge of the view, * increasing the padding of the view. The scrollbars will only overlap the * background, if any. */ public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; /** * Mask to check if the scrollbar style is overlay or inset. * {@hide} */ static final int SCROLLBARS_INSET_MASK = 0x01000000; /** * Mask to check if the scrollbar style is inside or outside. * {@hide} */ static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; /** * Mask for scrollbar style. * {@hide} */ static final int SCROLLBARS_STYLE_MASK = 0x03000000; /** * View flag indicating that the screen should remain on while the * window containing this view is visible to the user. This effectively * takes care of automatically setting the WindowManager's * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. */ public static final int KEEP_SCREEN_ON = 0x04000000; /** * View flag indicating whether this view should have sound effects enabled * for events such as clicking and touching. */ public static final int SOUND_EFFECTS_ENABLED = 0x08000000; /** * View flag indicating whether this view should have haptic feedback * enabled for events such as long presses. */ public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; /** * <p>Indicates that the view hierarchy should stop saving state when * it reaches this view. If state saving is initiated immediately at * the view, it will be allowed. * {@hide} */ static final int PARENT_SAVE_DISABLED = 0x20000000; /** * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> * {@hide} */ static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; /** @hide */ @IntDef(flag = true, value = { FOCUSABLES_ALL, FOCUSABLES_TOUCH_MODE }) @Retention(RetentionPolicy.SOURCE) public @interface FocusableMode {} /** * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} * should add all focusable Views regardless if they are focusable in touch mode. */ public static final int FOCUSABLES_ALL = 0x00000000; /** * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} * should add only Views focusable in touch mode. */ public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; /** @hide */ @IntDef({ FOCUS_BACKWARD, FOCUS_FORWARD, FOCUS_LEFT, FOCUS_UP, FOCUS_RIGHT, FOCUS_DOWN }) @Retention(RetentionPolicy.SOURCE) public @interface FocusDirection {} /** @hide */ @IntDef({ FOCUS_LEFT, FOCUS_UP, FOCUS_RIGHT, FOCUS_DOWN }) @Retention(RetentionPolicy.SOURCE) public @interface FocusRealDirection {} // Like @FocusDirection, but without forward/backward /** * Use with {@link #focusSearch(int)}. Move focus to the previous selectable * item. */ public static final int FOCUS_BACKWARD = 0x00000001; /** * Use with {@link #focusSearch(int)}. Move focus to the next selectable * item. */ public static final int FOCUS_FORWARD = 0x00000002; /** * Use with {@link #focusSearch(int)}. Move focus to the left. */ public static final int FOCUS_LEFT = 0x00000011; /** * Use with {@link #focusSearch(int)}. Move focus up. */ public static final int FOCUS_UP = 0x00000021; /** * Use with {@link #focusSearch(int)}. Move focus to the right. */ public static final int FOCUS_RIGHT = 0x00000042; /** * Use with {@link #focusSearch(int)}. Move focus down. */ public static final int FOCUS_DOWN = 0x00000082; /** * Bits of {@link #getMeasuredWidthAndState()} and * {@link #getMeasuredWidthAndState()} that provide the actual measured size. */ public static final int MEASURED_SIZE_MASK = 0x00ffffff; /** * Bits of {@link #getMeasuredWidthAndState()} and * {@link #getMeasuredWidthAndState()} that provide the additional state bits. */ public static final int MEASURED_STATE_MASK = 0xff000000; /** * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits * for functions that combine both width and height into a single int, * such as {@link #getMeasuredState()} and the childState argument of * {@link #resolveSizeAndState(int, int, int)}. */ public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; /** * Bit of {@link #getMeasuredWidthAndState()} and * {@link #getMeasuredWidthAndState()} that indicates the measured size * is smaller that the space the view would like to have. */ public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; /** * Base View state sets */ // Singles /** * Indicates the view has no states set. States are used with * {@link android.graphics.drawable.Drawable} to change the drawing of the * view depending on its state. * * @see android.graphics.drawable.Drawable * @see #getDrawableState() */ protected static final int[] EMPTY_STATE_SET; /** * Indicates the view is enabled. States are used with * {@link android.graphics.drawable.Drawable} to change the drawing of the * view depending on its state. * * @see android.graphics.drawable.Drawable * @see #getDrawableState() */ protected static final int[] ENABLED_STATE_SET; /** * Indicates the view is focused. States are used with * {@link android.graphics.drawable.Drawable} to change the drawing of the * view depending on its state. * * @see android.graphics.drawable.Drawable * @see #getDrawableState() */ protected static final int[] FOCUSED_STATE_SET; /** * Indicates the view is selected. States are used with * {@link android.graphics.drawable.Drawable} to change the drawing of the * view depending on its state. * * @see android.graphics.drawable.Drawable * @see #getDrawableState() */ protected static final int[] SELECTED_STATE_SET; /** * Indicates the view is pressed. States are used with * {@link android.graphics.drawable.Drawable} to change the drawing of the * view depending on its state. * * @see android.graphics.drawable.Drawable * @see #getDrawableState() */ protected static final int[] PRESSED_STATE_SET; /** * Indicates the view's window has focus. States are used with * {@link android.graphics.drawable.Drawable} to change the drawing of the * view depending on its state. * * @see android.graphics.drawable.Drawable * @see #getDrawableState() */ protected static final int[] WINDOW_FOCUSED_STATE_SET; // Doubles /** * Indicates the view is enabled and has the focus. * * @see #ENABLED_STATE_SET * @see #FOCUSED_STATE_SET */ protected static final int[] ENABLED_FOCUSED_STATE_SET; /** * Indicates the view is enabled and selected. * * @see #ENABLED_STATE_SET * @see #SELECTED_STATE_SET */ protected static final int[] ENABLED_SELECTED_STATE_SET; /** * Indicates the view is enabled and that its window has focus. * * @see #ENABLED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is focused and selected. * * @see #FOCUSED_STATE_SET * @see #SELECTED_STATE_SET */ protected static final int[] FOCUSED_SELECTED_STATE_SET; /** * Indicates the view has the focus and that its window has the focus. * * @see #FOCUSED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is selected and that its window has the focus. * * @see #SELECTED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; // Triples /** * Indicates the view is enabled, focused and selected. * * @see #ENABLED_STATE_SET * @see #FOCUSED_STATE_SET * @see #SELECTED_STATE_SET */ protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; /** * Indicates the view is enabled, focused and its window has the focus. * * @see #ENABLED_STATE_SET * @see #FOCUSED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is enabled, selected and its window has the focus. * * @see #ENABLED_STATE_SET * @see #SELECTED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is focused, selected and its window has the focus. * * @see #FOCUSED_STATE_SET * @see #SELECTED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is enabled, focused, selected and its window * has the focus. * * @see #ENABLED_STATE_SET * @see #FOCUSED_STATE_SET * @see #SELECTED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed and its window has the focus. * * @see #PRESSED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed and selected. * * @see #PRESSED_STATE_SET * @see #SELECTED_STATE_SET */ protected static final int[] PRESSED_SELECTED_STATE_SET; /** * Indicates the view is pressed, selected and its window has the focus. * * @see #PRESSED_STATE_SET * @see #SELECTED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed and focused. * * @see #PRESSED_STATE_SET * @see #FOCUSED_STATE_SET */ protected static final int[] PRESSED_FOCUSED_STATE_SET; /** * Indicates the view is pressed, focused and its window has the focus. * * @see #PRESSED_STATE_SET * @see #FOCUSED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed, focused and selected. * * @see #PRESSED_STATE_SET * @see #SELECTED_STATE_SET * @see #FOCUSED_STATE_SET */ protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; /** * Indicates the view is pressed, focused, selected and its window has the focus. * * @see #PRESSED_STATE_SET * @see #FOCUSED_STATE_SET * @see #SELECTED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed and enabled. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET */ protected static final int[] PRESSED_ENABLED_STATE_SET; /** * Indicates the view is pressed, enabled and its window has the focus. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed, enabled and selected. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET * @see #SELECTED_STATE_SET */ protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; /** * Indicates the view is pressed, enabled, selected and its window has the * focus. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET * @see #SELECTED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed, enabled and focused. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET * @see #FOCUSED_STATE_SET */ protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; /** * Indicates the view is pressed, enabled, focused and its window has the * focus. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET * @see #FOCUSED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; /** * Indicates the view is pressed, enabled, focused and selected. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET * @see #SELECTED_STATE_SET * @see #FOCUSED_STATE_SET */ protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; /** * Indicates the view is pressed, enabled, focused, selected and its window * has the focus. * * @see #PRESSED_STATE_SET * @see #ENABLED_STATE_SET * @see #SELECTED_STATE_SET * @see #FOCUSED_STATE_SET * @see #WINDOW_FOCUSED_STATE_SET */ protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; /** * The order here is very important to {@link #getDrawableState()} */ private static final int[][] VIEW_STATE_SETS; static final int VIEW_STATE_WINDOW_FOCUSED = 1; static final int VIEW_STATE_SELECTED = 1 << 1; static final int VIEW_STATE_FOCUSED = 1 << 2; static final int VIEW_STATE_ENABLED = 1 << 3; static final int VIEW_STATE_PRESSED = 1 << 4; static final int VIEW_STATE_ACTIVATED = 1 << 5; static final int VIEW_STATE_ACCELERATED = 1 << 6; static final int VIEW_STATE_HOVERED = 1 << 7; static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 0 0
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