Android Drawable完全解析（一）：Drawable源碼分析（上）
Android Drawable完全解析（一）：Drawable源碼分析（中）
Android Drawable完全解析（一）：Drawable源碼分析（下）

呃...我不是故意要湊篇幅寫個(gè)什么上下篇敏弃，實(shí)在是因?yàn)镈rawable源碼有點(diǎn)長，一篇寫不下啦O(∩_∩)O~

上一篇文章 其實(shí)你不懂：Drawable著色(tint)的兼容方案 源碼解析 描述了Drawable的著色原理瓶颠，文章里有涉及到Drawable的一些方法粹淋，順便看一下Drawabld的源碼，發(fā)現(xiàn)Drawable涉及的面很廣借杰，尤其是竟然有那么多的繼承類蔗衡。想想自己平時(shí)也就用過ColorDrawable,StateListDrawable,BitmapDrawable很有限的幾個(gè)子類粘都，對于Drawable的應(yīng)用還是太零散了，所以寫這個(gè)Drawable系列文章堆生，對其做一個(gè)相對完整的分析淑仆！

這是“Drawable完全解析”系列文章的第一篇墩弯，就從Drawable的源碼分析開始渔工！

1:Drawable與其子類的繼承關(guān)系

直接看圖引矩，暫不詳細(xì)介紹具體使用方法。

Drawable及其子類繼承關(guān)系.png

可以看到Drawable竟然有這么多子類区端，真的需要花一些時(shí)間才能分別搞得清楚。

2:Drawable源碼分析/翻譯

此處源碼是SDK 24版本下的Drawable.java文件，不同版本下應(yīng)該會(huì)有出入延旧，敬請注意！
源碼較長集畅，英文較好的同學(xué)記得指出我翻譯和理解的錯(cuò)誤挺智！

package android.graphics.drawable;

import com.android.internal.R;
*****略

/**
Drawable是一個(gè)用于處理各種可繪制資源的抽象類二鳄。我們使用Drawable最常見的情況就是將獲取到的資源繪制到屏幕上订讼；Drawable類提供了一些通用的API來處理以下具有多種表現(xiàn)形式的可視資源/視覺資源。
 * A Drawable is a general abstraction for "something that can be drawn."  Most
 * often you will deal with Drawable as the type of resource retrieved for
 * drawing things to the screen; the Drawable class provides a generic API for
 * dealing with an underlying visual resource that may take a variety of forms.
和View不同脖苏，Drawable實(shí)例不具備任何能力接收事件或與用戶交互。
 * Unlike a {@link android.view.View}, a Drawable does not have any facility to
 * receive events or otherwise interact with the user.
 *
除了簡單繪圖蜒谤，Drawable提供了一些通用的機(jī)制使客戶端與當(dāng)前正在繪制的內(nèi)容進(jìn)行交互。
 * <p>In addition to simple drawing, Drawable provides a number of generic
 * mechanisms for its client to interact with what is being drawn:
 *

setBounds方法必須被Drawable實(shí)例調(diào)用阶祭，用于聲明Drawable實(shí)例繪制的位置和大小濒募。所有的Drawable實(shí)例都會(huì)生成請求的尺寸，這一點(diǎn)通成我Γ可以通過縮放圖像很容易就達(dá)到。對一些Drawable實(shí)例宝磨，客戶端可以通過調(diào)用getIntrinsicHeight和getIntrinsicWidth方法得到其首選尺寸懊烤。
 * <ul>
 *     <li> The {@link #setBounds} method <var>must</var> be called to tell the
 *     Drawable where it is drawn and how large it should be.  All Drawables
 *     should respect the requested size, often simply by scaling their
 *     imagery.  A client can find the preferred size for some Drawables with
 *     the {@link #getIntrinsicHeight} and {@link #getIntrinsicWidth} methods.

getPadding會(huì)將Drawable實(shí)例與實(shí)例中內(nèi)容的間隔信息存儲在Rect實(shí)例中茸习。
 *     <li> The {@link #getPadding} method can return from some Drawables
 *     information about how to frame content that is placed inside of them.
例如，一個(gè)Drawable實(shí)例作為一個(gè)Button的背景猫胁，Button控件實(shí)例需要返回padding值用來放置Button控件顯示的內(nèi)容。
 *     For example, a Drawable that is intended to be the frame for a button
 *     widget would need to return padding that correctly places the label
 *     inside of itself.
 *

setState方法允許客戶端告知Drawable實(shí)例在什么狀態(tài)下才進(jìn)行繪制菠赚。
例如“焦點(diǎn)獲取狀態(tài)”，“選中狀態(tài)”等等拌牲。某些Drawable可能會(huì)根據(jù)選定的狀態(tài)值變更它們的外觀。
 *     <li> The {@link #setState} method allows the client to tell the Drawable
 *     in which state it is to be drawn, such as "focused", "selected", etc.
 *     Some drawables may modify their imagery based on the selected state.
 *

setLevel方法允許客戶端提供一個(gè)單一的連續(xù)控制器來編輯正在顯示的Drawable實(shí)例砚婆，例如電量水平或者進(jìn)度值坷虑。某些Drawable實(shí)例可以根據(jù)當(dāng)前的level值變更它們的外觀迄损。
 *     <li> The {@link #setLevel} method allows the client to supply a single
 *     continuous controller that can modify the Drawable is displayed, such as
 *     a battery level or progress level.  Some drawables may modify their
 *     imagery based on the current level.
 *

通過Callback接口痊远，一個(gè)Drawable實(shí)例可以回調(diào)其客戶端來執(zhí)行動(dòng)畫冒版。為了動(dòng)畫可以被執(zhí)行辞嗡，所有的客戶端都應(yīng)該支持這個(gè)Callback接口。實(shí)現(xiàn)這一效果最簡單的方法就是通過系統(tǒng)提供的機(jī)制挺狰，例如ImageView，View.setBackgoound方法趁耗。
 *     <li> A Drawable can perform animations by calling back to its client
 *     through the {@link Callback} interface.  All clients should support this
 *     interface (via {@link #setCallback}) so that animations will work.  A
 *     simple way to do this is through the system facilities such as
 *     {@link android.view.View#setBackground(Drawable)} and
 *     {@link android.widget.ImageView}.
 * </ul>
 *

盡管通常情況下對應(yīng)用不可見，Drawable實(shí)例可能存在以下多種形式：
Bitmap:最簡單的Drawable形式罢屈，PNG或者JPEG圖片。
.9圖：PNG的一個(gè)擴(kuò)展曼月，可以支持設(shè)置其如何填充內(nèi)容，如何被拉伸聪姿。
Shape：包含簡單的繪制指令破喻，用于替代bitmap，某些情況下對大小調(diào)整有更好表現(xiàn)咆繁。
Layers：一個(gè)復(fù)合的Drawable，按照層級進(jìn)行繪制坏为，單個(gè)Drawable實(shí)例繪制于其下層Drawable實(shí)例集合之上。
States：一個(gè)復(fù)合的Drawable够颠，根據(jù)它的state選擇一個(gè)Drawable集合。
Levels：一個(gè)復(fù)合的Drawable剃诅，根據(jù)它的level選擇一個(gè)Drawable集合。
Scale：一個(gè)復(fù)合的Drawable和單個(gè)Drawable實(shí)例構(gòu)成聊品，它的總體尺寸由它的當(dāng)前l(fā)evel值決定。
 * Though usually not visible to the application, Drawables may take a variety
 * of forms:
 *
 * <ul>
 *     <li> <b>Bitmap</b>: the simplest Drawable, a PNG or JPEG image.
 *     <li> <b>Nine Patch</b>: an extension to the PNG format allows it to
 *     specify information about how to stretch it and place things inside of
 *     it.
 *     <li> <b>Shape</b>: contains simple drawing commands instead of a raw
 *     bitmap, allowing it to resize better in some cases.
 *     <li> <b>Layers</b>: a compound drawable, which draws multiple underlying
 *     drawables on top of each other.
 *     <li> <b>States</b>: a compound drawable that selects one of a set of
 *     drawables based on its state.
 *     <li> <b>Levels</b>: a compound drawable that selects one of a set of
 *     drawables based on its level.
 *     <li> <b>Scale</b>: a compound drawable with a single child drawable,
 *     whose overall size is modified based on the current level.
 * </ul>
 *

自定義Drawable
所有的Android版本都支持框架層提供的Drawable類被擴(kuò)展/自定義和應(yīng)用于運(yùn)行時(shí)。從Android版本24開始赚抡，自定義Drawable可以在XML中直接使用。
 * <a name="Custom"></a>
 * <h3>Custom drawables</h3>
 *
 * <p>
 * All versions of Android allow the Drawable class to be extended and used at
 * run time in place of framework-provided drawable classes. Starting in
 * {@link android.os.Build.VERSION_CODES#N API 24}, custom drawables classes
 * may also be used in XML.
 * <p>
注：
自定義Drawable僅能應(yīng)用于當(dāng)前應(yīng)用，其他應(yīng)用無法加載它們。
自定義Drawable必須繼承Drawable類剖煌，至少重寫draw方法以繪制內(nèi)容。
 * <strong>Note:</strong> Custom drawable classes are only accessible from
 * within your application package. Other applications will not be able to load
 * them.
 * <p>
 * At a minimum, custom drawable classes must implement the abstract methods on
 * Drawable and should override the {@link Drawable#draw(Canvas)} method to
 * draw content.
自定義Drawable用于XML中有多種方式：
1：直接引用自定義Drawable類名的全稱茉兰，且該類必須為公共頂層類。
2：使用drawable作為XML的元素名稱，指定該自定義Drawable類的全稱黔龟。該自定義Drawable類可以是 公共頂層類或者公共靜態(tài)內(nèi)部類。
 * <p>
 * Custom drawables classes may be used in XML in multiple ways:
 * <ul>
 *     <li>
 *         Using the fully-qualified class name as the XML element name. For
 *         this method, the custom drawable class must be a public top-level
 *         class.
 * <pre>
 * <com.myapp.MyCustomDrawable xmlns:android="http://schemas.android.com/apk/res/android"
 *     android:color="#ffff0000" />
 * </pre>
 *     </li>
 *     <li>
 *         Using <em>drawable</em> as the XML element name and specifying the
 *         fully-qualified class name from the <em>class</em> attribute. This
 *         method may be used for both public top-level classes and public
 *         static inner classes.
 * <pre>
 * <drawable xmlns:android="http://schemas.android.com/apk/res/android"
 *     class="com.myapp.MyTopLevelClass$InnerCustomDrawable"
 *     android:color="#ffff0000" />
 * </pre>
 *     </li>
 * </ul>
 *
 略
 */
public abstract class Drawable {
    private static final Rect ZERO_BOUNDS_RECT = new Rect();

    static final PorterDuff.Mode DEFAULT_TINT_MODE = PorterDuff.Mode.SRC_IN;

    private int[] mStateSet = StateSet.WILD_CARD;
    private int mLevel = 0;
    private @Config int mChangingConfigurations = 0;
    private Rect mBounds = ZERO_BOUNDS_RECT;  // lazily becomes a new Rect()
    private WeakReference<Callback> mCallback = null;
    private boolean mVisible = true;

    private int mLayoutDirection;

    /**
    在通過setBounds設(shè)置的范圍內(nèi)進(jìn)行繪制如贷，通過調(diào)用setAlpha和setColorFilter
    等方法可以影響繪制的效果。
    canvas：當(dāng)前Drawable實(shí)例要被繪制到canvas上。
     * Draw in its bounds (set via setBounds) respecting optional effects such
     * as alpha (set via setAlpha) and color filter (set via setColorFilter).
     *
     * @param canvas The canvas to draw into
     */
    public abstract void draw(@NonNull Canvas canvas);
    /**
    為當(dāng)前Drawable實(shí)例設(shè)置一個(gè)矩形范圍，在draw方法調(diào)用時(shí)候踪少，
    Drawable實(shí)例將被繪制到這個(gè)矩形范圍內(nèi)。
     * Specify a bounding rectangle for the Drawable. This is where the drawable
     * will draw when its draw() method is called.
     */
    public void setBounds(int left, int top, int right, int bottom) {
        Rect oldBounds = mBounds;

        if (oldBounds == ZERO_BOUNDS_RECT) {
            oldBounds = mBounds = new Rect();
        }

        if (oldBounds.left != left || oldBounds.top != top ||
                oldBounds.right != right || oldBounds.bottom != bottom) {
            if (!oldBounds.isEmpty()) {
                // first invalidate the previous bounds
                invalidateSelf();
            }
            mBounds.set(left, top, right, bottom);
            onBoundsChange(mBounds);
        }
    }
    public void setBounds(@NonNull Rect bounds) {
        setBounds(bounds.left, bounds.top, bounds.right, bounds.bottom);
    }

    /**
    將當(dāng)前Drawable實(shí)例通過setBounds設(shè)置的繪制范圍拷貝到客戶端提供的Rect實(shí)例中返回
     * Return a copy of the drawable's bounds in the specified Rect (allocated
     * by the caller). The bounds specify where this will draw when its draw()
     * method is called.
     *
     * @param bounds Rect to receive the drawable's bounds (allocated by the
     *               caller).
     */
    public final void copyBounds(@NonNull Rect bounds) {
        bounds.set(mBounds);
    }
    public final Rect copyBounds() {
        return new Rect(mBounds);
    }
    /**
    返回當(dāng)前Drawable實(shí)例的矩形繪制范圍锉罐。注：返回的矩形就是
    當(dāng)前Drawable實(shí)際的繪制范圍矩形脓规，所以如果是需要一個(gè)拷貝的矩形范圍秒紧，
    應(yīng)該調(diào)用copyBounds來代替。

    調(diào)用getBounds叙淌，你不能修改返回的矩形，會(huì)影響Drawable實(shí)例。
     * Return the drawable's bounds Rect. Note: for efficiency, the returned
     * object may be the same object stored in the drawable (though this is not
     * guaranteed), so if a persistent copy of the bounds is needed, call
     * copyBounds(rect) instead.
     * You should also not change the object returned by this method as it may
     * be the same object stored in the drawable.
     *
     * @return The bounds of the drawable (which may change later, so caller
     *         beware). DO NOT ALTER the returned object as it may change the
     *         stored bounds of this drawable.
     *
     * @see #copyBounds()
     * @see #copyBounds(android.graphics.Rect)
     */
    @NonNull
    public final Rect getBounds() {
        if (mBounds == ZERO_BOUNDS_RECT) {
            mBounds = new Rect();
        }

        return mBounds;
    }
    /**
    返回當(dāng)前Drawable實(shí)例的模糊繪制范圍矩形督勺。
    注：返回的矩形和當(dāng)前Drawable繪制返回矩形是同一個(gè)對象渠羞。
     * Return the drawable's dirty bounds Rect. Note: for efficiency, the
     * returned object may be the same object stored in the drawable (though
     * this is not guaranteed).
     * <p>
     * By default, this returns the full drawable bounds. Custom drawables may
     * override this method to perform more precise invalidation.
     *
     * @return The dirty bounds of this drawable
     */
    @NonNull
    public Rect getDirtyBounds() {
        return getBounds();
    }

    /**
    這段我沒怎么看懂，勉強(qiáng)翻譯一下玷氏，哪位同學(xué)懂可以留言堵未！
    為配置參數(shù)設(shè)置一個(gè)標(biāo)記，當(dāng)該配置參數(shù)變更時(shí)可能改變當(dāng)前
    Drawable實(shí)例盏触，要求當(dāng)前Drawable實(shí)例重新創(chuàng)建块饺。
     * Set a mask of the configuration parameters for which this drawable
     * may change, requiring that it be re-created.
     *
     * @param configs A mask of the changing configuration parameters, as
     * defined by {@link android.content.pm.ActivityInfo}.
     *
     * @see android.content.pm.ActivityInfo
     */
    public void setChangingConfigurations(@Config int configs) {
        mChangingConfigurations = configs;
    }
    public @Config int getChangingConfigurations() {
        return mChangingConfigurations;
    }
    /**
    當(dāng)設(shè)置為true赞辩，該Drawable實(shí)例在繪制到一個(gè)低于8-bits每單位色值
    的設(shè)備上時(shí)候顏色將發(fā)生‘抖動(dòng)’？
     * Set to true to have the drawable dither its colors when drawn to a
     * device with fewer than 8-bits per color component.
     *
     * @see android.graphics.Paint#setDither(boolean);
     * @deprecated This property is ignored.
     */
    @Deprecated
    public void setDither(boolean dither) {}
    /**
    當(dāng)設(shè)置為true,則該Drawable實(shí)例在縮放或者旋轉(zhuǎn)時(shí)候?qū)?    對它關(guān)聯(lián)的bitmap進(jìn)行濾波過濾授艰”嫠裕可以提升旋轉(zhuǎn)時(shí)的繪制效果。
    如果該Drawable實(shí)例未使用bitmap,這個(gè)方法無作用淮腾。
     * Set to true to have the drawable filter its bitmaps with bilinear
     * sampling when they are scaled or rotated.
     *
     * <p>This can improve appearance when bitmaps are rotated. If the drawable
     * does not use bitmaps, this call is ignored.</p>
     *
     * @see #isFilterBitmap()
     * @see android.graphics.Paint#setFilterBitmap(boolean);
     */
    public void setFilterBitmap(boolean filter) {}
    public boolean isFilterBitmap() {
        return false;
    }
    /**
    一個(gè)回調(diào)接口糟需，用于調(diào)度和執(zhí)行Drawable實(shí)例的動(dòng)畫。
    如果要實(shí)現(xiàn)自定義的動(dòng)畫Drawable,就需要實(shí)現(xiàn)這個(gè)接口谷朝。
     * Implement this interface if you want to create an animated drawable that
     * extends {@link android.graphics.drawable.Drawable Drawable}.
     * Upon retrieving a drawable, use
     * {@link Drawable#setCallback(android.graphics.drawable.Drawable.Callback)}
     * to supply your implementation of the interface to the drawable; it uses
     * this interface to schedule and execute animation changes.
     */
    public interface Callback {
        /**
        Drawable實(shí)例被重繪時(shí)候調(diào)用洲押。在當(dāng)前Drawable實(shí)例位置的View
        實(shí)例需要重繪，或者至少部分重繪圆凰。
         * Called when the drawable needs to be redrawn.  A view at this point
         * should invalidate itself (or at least the part of itself where the
         * drawable appears).
         *
         * @param who The drawable that is requesting the update.
         */
        void invalidateDrawable(@NonNull Drawable who);

        /**
        一個(gè)Drawable實(shí)例可以調(diào)用這個(gè)方法預(yù)先安排動(dòng)畫的下一幀杈帐。
        也可以通過Handler.postAtTime實(shí)現(xiàn)。
         * A Drawable can call this to schedule the next frame of its
         * animation.  An implementation can generally simply call
         * {@link android.os.Handler#postAtTime(Runnable, Object, long)} with
         * the parameters <var>(what, who, when)</var> to perform the
         * scheduling.
         *
         * @param who The drawable being scheduled.
         * @param what The action to execute.
         * @param when The time (in milliseconds) to run.  The timebase is
         *             {@link android.os.SystemClock#uptimeMillis}
         */
        void scheduleDrawable(@NonNull Drawable who, @NonNull Runnable what, long when);

        /**
        一個(gè)Drawable實(shí)例可以調(diào)用這個(gè)方法取消之前安排的某一幀专钉。
        也可以通過Handler.removeCallbacks實(shí)現(xiàn)挑童。
         * A Drawable can call this to unschedule an action previously
         * scheduled with {@link #scheduleDrawable}.  An implementation can
         * generally simply call
         * {@link android.os.Handler#removeCallbacks(Runnable, Object)} with
         * the parameters <var>(what, who)</var> to unschedule the drawable.
         *
         * @param who The drawable being unscheduled.
         * @param what The action being unscheduled.
         */
        void unscheduleDrawable(@NonNull Drawable who, @NonNull Runnable what);
    }
    /**
    如果客戶端要求支持動(dòng)畫Drawable,將一個(gè)Callback實(shí)例綁定到當(dāng)前
    Drawable實(shí)例上。
     * Bind a {@link Callback} object to this Drawable.  Required for clients
     * that want to support animated drawables.
     *
     * @param cb The client's Callback implementation.
     *
     * @see #getCallback()
     */
    public final void setCallback(@Nullable Callback cb) {
        mCallback = cb != null ? new WeakReference<>(cb) : null;
    }
    public Callback getCallback() {
        return mCallback != null ? mCallback.get() : null;
    }
    /**
    通過由調(diào)用setCallBack設(shè)置過的Callback實(shí)例執(zhí)行
    invalidateDrawable跃须。如果沒有調(diào)用過setCallback站叼，則無效果
     * Use the current {@link Callback} implementation to have this Drawable
     * redrawn.  Does nothing if there is no Callback attached to the
     * Drawable.
     *
     * @see Callback#invalidateDrawable
     * @see #getCallback()
     * @see #setCallback(android.graphics.drawable.Drawable.Callback)
     */
    public void invalidateSelf() {
        final Callback callback = getCallback();
        if (callback != null) {
            callback.invalidateDrawable(this);
        }
    }
    /**
    通過由調(diào)用setCallBack設(shè)置過的Callback實(shí)例執(zhí)行
    scheduleDrawable。如果沒有調(diào)用過setCallback菇民，則無效果
     * Use the current {@link Callback} implementation to have this Drawable
     * scheduled.  Does nothing if there is no Callback attached to the
     * Drawable.
     *
     * @param what The action being scheduled.
     * @param when The time (in milliseconds) to run.
     *
     * @see Callback#scheduleDrawable
     */
    public void scheduleSelf(@NonNull Runnable what, long when) {
        final Callback callback = getCallback();
        if (callback != null) {
            callback.scheduleDrawable(this, what, when);
        }
    }
    /**
    通過由調(diào)用setCallBack設(shè)置過的Callback實(shí)例執(zhí)行
    unscheduleDrawable尽楔。如果沒有調(diào)用過setCallback，則無效果
     * Use the current {@link Callback} implementation to have this Drawable
     * unscheduled.  Does nothing if there is no Callback attached to the
     * Drawable.
     *
     * @param what The runnable that you no longer want called.
     *
     * @see Callback#unscheduleDrawable
     */
    public void unscheduleSelf(@NonNull Runnable what) {
        final Callback callback = getCallback();
        if (callback != null) {
            callback.unscheduleDrawable(this, what);
        }
    }
    /**
    獲取當(dāng)前Drawable實(shí)例的布局方向玉雾。
     * Returns the resolved layout direction for this Drawable.
     *
     * @return One of {@link android.view.View#LAYOUT_DIRECTION_LTR},
     *         {@link android.view.View#LAYOUT_DIRECTION_RTL}
     * @see #setLayoutDirection(int)
     */
    public @View.ResolvedLayoutDir int getLayoutDirection() {
        return mLayoutDirection;
    }
    /**
    設(shè)置當(dāng)前Drawable實(shí)例的布局方向翔试。
     * Set the layout direction for this drawable. Should be a resolved
     * layout direction, as the Drawable has no capacity to do the resolution on
     * its own.
     *
     * @param layoutDirection the resolved layout direction for the drawable,
     *                        either {@link android.view.View#LAYOUT_DIRECTION_LTR}
     *                        or {@link android.view.View#LAYOUT_DIRECTION_RTL}
     * @return {@code true} if the layout direction change has caused the
     *         appearance of the drawable to change such that it needs to be
     *         re-drawn, {@code false} otherwise
     * @see #getLayoutDirection()
     */
    public final boolean setLayoutDirection(@View.ResolvedLayoutDir int layoutDirection) {
        if (mLayoutDirection != layoutDirection) {
            //如果當(dāng)前Drawable布局方向和layoutDirection不一致，
            //則修改布局方向?yàn)閘ayoutDirection复旬，然后執(zhí)行onLayoutDirectionChanged
            mLayoutDirection = layoutDirection;
            return onLayoutDirectionChanged(layoutDirection);
        }
        return false;
    }
    /**
    當(dāng)調(diào)用setLayoutDirection方法垦缅，Drawable布局方向發(fā)生變化后調(diào)用
     * Called when the drawable's resolved layout direction changes.
     *
     * @param layoutDirection the new resolved layout direction
     * @return {@code true} if the layout direction change has caused the
     *         appearance of the drawable to change such that it needs to be
     *         re-drawn, {@code false} otherwise
     * @see #setLayoutDirection(int)
     */
    public boolean onLayoutDirectionChanged(@View.ResolvedLayoutDir int layoutDirection) {
        return false;
    }
    /**
    設(shè)置Drawable實(shí)例的透明度。
    0：完全透明
    255:完全不透明
     * Specify an alpha value for the drawable. 0 means fully transparent, and
     * 255 means fully opaque.
     */
    public abstract void setAlpha(@IntRange(from=0,to=255) int alpha);
    @IntRange(from=0,to=255)
    public int getAlpha() {
        return 0xFF;
    }
    /**
    被隱匿
     * @hide
     *
     * Internal-only method for setting xfermode on certain supported drawables.
     *
     * Should not be made public since the layers and drawing area with which
     * Drawables draw is private implementation detail, and not something apps
     * should rely upon.
     */
    public void setXfermode(@Nullable Xfermode mode) {
        // Base implementation drops it on the floor for compatibility. Whee!
    }
    /**
    為當(dāng)前Drawable實(shí)例設(shè)置顏色濾鏡
     * Specify an optional color filter for the drawable.
     * <p>
     * If a Drawable has a ColorFilter, each output pixel of the Drawable's
     * drawing contents will be modified by the color filter before it is
     * blended onto the render target of a Canvas.
     * </p>
     * <p>
     * Pass {@code null} to remove any existing color filter.
     * </p>
     * <p class="note"><strong>Note:</strong> Setting a non-{@code null} color
     * filter disables {@link #setTintList(ColorStateList) tint}.
     * </p>
     *
     * @param colorFilter The color filter to apply, or {@code null} to remove the
     *            existing color filter
     */
    public abstract void setColorFilter(@Nullable ColorFilter colorFilter);
    /**
    為當(dāng)前Drawable實(shí)例設(shè)置濾鏡效果
     * Specify a color and Porter-Duff mode to be the color filter for this
     * drawable.
     * <p>
     * Convenience for {@link #setColorFilter(ColorFilter)} which constructs a
     * {@link PorterDuffColorFilter}.
     * </p>
     * <p class="note"><strong>Note:</strong> Setting a color filter disables
     * {@link #setTintList(ColorStateList) tint}.
     * </p>
     */
    public void setColorFilter(@ColorInt int color, @NonNull PorterDuff.Mode mode) {
        setColorFilter(new PorterDuffColorFilter(color, mode));
    }
    /**
    為當(dāng)前Drawable實(shí)例著色
     * Specifies tint color for this drawable.
     * <p>
    當(dāng)前Drawable實(shí)例的繪制內(nèi)容在被繪制到屏幕上之前將被指定顏色著色
    當(dāng)前方法和setColorFilter類似驹碍。
     * A Drawable's drawing content will be blended together with its tint
     * before it is drawn to the screen. This functions similarly to
     * {@link #setColorFilter(int, PorterDuff.Mode)}.
     * </p>
     * <p>
     * To clear the tint, pass {@code null} to
     * {@link #setTintList(ColorStateList)}.
     * </p>
     * <p class="note"><strong>Note:</strong> Setting a color filter via
     * {@link #setColorFilter(ColorFilter)} or
     * {@link #setColorFilter(int, PorterDuff.Mode)} overrides tint.
     * </p>
     *
     * @param tintColor Color to use for tinting this drawable
     * @see #setTintList(ColorStateList)
     * @see #setTintMode(PorterDuff.Mode)
     */
    public void setTint(@ColorInt int tintColor) {
        setTintList(ColorStateList.valueOf(tintColor));
    }
    /**
    根據(jù)ColorStateList對當(dāng)前Drawable實(shí)例進(jìn)行著色
    這個(gè)一個(gè)空方法１谙选７不小！在上一篇文章中已經(jīng)指出怔球，Drawabld的子類
    實(shí)現(xiàn)了這個(gè)方法嚼酝。
     * Specifies tint color for this drawable as a color state list.
     * <p>
     * A Drawable's drawing content will be blended together with its tint
     * before it is drawn to the screen. This functions similarly to
     * {@link #setColorFilter(int, PorterDuff.Mode)}.
     * </p>
     * <p class="note"><strong>Note:</strong> Setting a color filter via
     * {@link #setColorFilter(ColorFilter)} or
     * {@link #setColorFilter(int, PorterDuff.Mode)} overrides tint.
     * </p>
     *
     * @param tint Color state list to use for tinting this drawable, or
     *            {@code null} to clear the tint
     * @see #setTint(int)
     * @see #setTintMode(PorterDuff.Mode)
     */
    public void setTintList(@Nullable ColorStateList tint) {}
    /**
    設(shè)置當(dāng)前Drawable實(shí)例著色的過濾模式
     * Specifies a tint blending mode for this drawable.
     * <p>
     * Defines how this drawable's tint color should be blended into the drawable
     * before it is drawn to screen. Default tint mode is {@link PorterDuff.Mode#SRC_IN}.
     * </p>
     * <p class="note"><strong>Note:</strong> Setting a color filter via
     * {@link #setColorFilter(ColorFilter)} or
     * {@link #setColorFilter(int, PorterDuff.Mode)} overrides tint.
     * </p>
     *
     * @param tintMode A Porter-Duff blending mode
     * @see #setTint(int)
     * @see #setTintList(ColorStateList)
     */
    public void setTintMode(@NonNull PorterDuff.Mode tintMode) {}
    public @Nullable ColorFilter getColorFilter() {
        return null;
    }
    /**
    取消當(dāng)前Drawable實(shí)例的濾鏡。
     * Removes the color filter for this drawable.
     */
    public void clearColorFilter() {
        setColorFilter(null);
    }
    /**
    設(shè)置當(dāng)前Drawable實(shí)例熱點(diǎn)區(qū)域的中心點(diǎn)坐標(biāo)
     * Specifies the hotspot's location within the drawable.
     *
     * @param x The X coordinate of the center of the hotspot
     * @param y The Y coordinate of the center of the hotspot
     */
    public void setHotspot(float x, float y) {}
    /**
    設(shè)置當(dāng)前Drawable實(shí)例的熱點(diǎn)區(qū)域的邊界
     * Sets the bounds to which the hotspot is constrained, if they should be
     * different from the drawable bounds.
     *
     * @param left position in pixels of the left bound
     * @param top position in pixels of the top bound
     * @param right position in pixels of the right bound
     * @param bottom position in pixels of the bottom bound
     * @see #getHotspotBounds(android.graphics.Rect)
     */
    public void setHotspotBounds(int left, int top, int right, int bottom) {}
    /**
     * Populates {@code outRect} with the hotspot bounds.
     *
     * @param outRect the rect to populate with the hotspot bounds
     * @see #setHotspotBounds(int, int, int, int)
     */
    public void getHotspotBounds(@NonNull Rect outRect) {
        outRect.set(getBounds());
    }
    /**
    被隱匿
     * Whether this drawable requests projection.
     *
     * @hide magic!
     */
    public boolean isProjected() {
        return false;
    }
    /**
    標(biāo)示當(dāng)前Drawable實(shí)例的外觀是否要根據(jù)state進(jìn)行變更竟坛。
    客戶端可以用這個(gè)方法判斷是否有必要計(jì)算state并調(diào)用setState闽巩。
     * Indicates whether this drawable will change its appearance based on
     * state. Clients can use this to determine whether it is necessary to
     * calculate their state and call setState.
     *
     * @return True if this drawable changes its appearance based on state,
     *         false otherwise.
     * @see #setState(int[])
     */
    public boolean isStateful() {
        return false;
    }
    /**
    為當(dāng)前Drawable實(shí)例設(shè)置一個(gè)狀態(tài)值集合。當(dāng)現(xiàn)有狀態(tài)和stateSet
    不同時(shí)候担汤，觸發(fā)onStateChange(stateSet)方法涎跨。
     * Specify a set of states for the drawable. These are use-case specific,
     * so see the relevant documentation. As an example, the background for
     * widgets like Button understand the following states:
     * [{@link android.R.attr#state_focused},
     *  {@link android.R.attr#state_pressed}].
     *
     * <p>If the new state you are supplying causes the appearance of the
     * Drawable to change, then it is responsible for calling
     * {@link #invalidateSelf} in order to have itself redrawn, <em>and</em>
     * true will be returned from this function.
     *
     * <p>Note: The Drawable holds a reference on to <var>stateSet</var>
     * until a new state array is given to it, so you must not modify this
     * array during that time.</p>
     *
     * @param stateSet The new set of states to be displayed.
     *
     * @return Returns true if this change in state has caused the appearance
     * of the Drawable to change (hence requiring an invalidate), otherwise
     * returns false.
     */
    public boolean setState(@NonNull final int[] stateSet) {
        if (!Arrays.equals(mStateSet, stateSet)) {
            mStateSet = stateSet;
            return onStateChange(stateSet);
        }
        return false;
    }
    /**
     * Describes the current state, as a union of primitve states, such as
     * {@link android.R.attr#state_focused},
     * {@link android.R.attr#state_selected}, etc.
     * Some drawables may modify their imagery based on the selected state.
     * @return An array of resource Ids describing the current state.
     */
    public @NonNull int[] getState() {
        return mStateSet;
    }
    /**
    如果當(dāng)前Drawable實(shí)例在執(zhí)行過渡動(dòng)畫，要求當(dāng)前實(shí)例
    立即跳轉(zhuǎn)到當(dāng)前狀態(tài)并跳過任何正在執(zhí)行的動(dòng)畫崭歧。
     * If this Drawable does transition animations between states, ask that
     * it immediately jump to the current state and skip any active animations.
     */
    public void jumpToCurrentState() {
    }
    /**
    返回當(dāng)前Drawable實(shí)例正在使用的Drawable實(shí)例隅很，
    對于一般單個(gè)Drawable，返回值就是自身率碾，對于像StateListDrawable
    這樣的復(fù)合Drawable實(shí)例叔营，則返回其持有的一個(gè)子Drawable實(shí)例。
     * @return The current drawable that will be used by this drawable. For simple drawables, this
     *         is just the drawable itself. For drawables that change state like
     *         {@link StateListDrawable} and {@link LevelListDrawable} this will be the child drawable
     *         currently in use.
     */
    public @NonNull Drawable getCurrent() {
        return this;
    }
    /**
    為當(dāng)前Drawable實(shí)例設(shè)置圖像級別所宰，從0到10000绒尊。setLevel使得
    Drawable實(shí)例可以通過一個(gè)不斷變化的控制器來變更它的圖像，
    例如音量等級或者進(jìn)度歧匈。
    
     * Specify the level for the drawable.  This allows a drawable to vary its
     * imagery based on a continuous controller, for example to show progress
     * or volume level.
     *
     * <p>If the new level you are supplying causes the appearance of the
     * Drawable to change, then it is responsible for calling
     * {@link #invalidateSelf} in order to have itself redrawn, <em>and</em>
     * true will be returned from this function.
     *
     * @param level The new level, from 0 (minimum) to 10000 (maximum).
     *
     * @return Returns true if this change in level has caused the appearance
     * of the Drawable to change (hence requiring an invalidate), otherwise
     * returns false.
     */
    public final boolean setLevel(@IntRange(from=0,to=10000) int level) {
        if (mLevel != level) {
            //修改圖像等級為level垒酬，并調(diào)用onLevelChange
            mLevel = level;
            return onLevelChange(level);
        }
        return false;
    }
    /**
     * Retrieve the current level.
     *
     * @return int Current level, from 0 (minimum) to 10000 (maximum).
     */
    public final @IntRange(from=0,to=10000) int getLevel() {
        return mLevel;
    }

~~~~(>_<)~~~~ 
當(dāng)前文章長度正在接近簡書的限度，請考慮分篇書寫吧
~~~~(>_<)~~~~ 

    /**
    設(shè)置當(dāng)前Drawable實(shí)例是否可見件炉，并不會(huì)影響Drawable實(shí)例的行為勘究，
    但是可以被某些Drawable來控制是否執(zhí)行動(dòng)畫。
    例如：AnimationDrawable可以通過這個(gè)方法啟動(dòng)或者停止動(dòng)畫斟冕，
    后續(xù)文章會(huì)有驗(yàn)證口糕。
     * Set whether this Drawable is visible.  This generally does not impact
     * the Drawable's behavior, but is a hint that can be used by some
     * Drawables, for example, to decide whether run animations.
     *
     * @param visible Set to true if visible, false if not.
     * @param restart You can supply true here to force the drawable to behave
     *                as if it has just become visible, even if it had last
     *                been set visible.  Used for example to force animations
     *                to restart.
     *
     * @return boolean Returns true if the new visibility is different than
     *         its previous state.
     */
    public boolean setVisible(boolean visible, boolean restart) {
        boolean changed = mVisible != visible;
        if (changed) {
            mVisible = visible;
            invalidateSelf();
        }
        return changed;
    }
    public final boolean isVisible() {
        return mVisible;
    }
    /**
    設(shè)置當(dāng)前Drawable實(shí)例是不是自動(dòng)被“鏡像”/左右對調(diào)
    當(dāng)它的布局模式是從右到左
     * Set whether this Drawable is automatically mirrored when its layout direction is RTL
     * (right-to left). See {@link android.util.LayoutDirection}.
     *
     * @param mirrored Set to true if the Drawable should be mirrored, false if not.
     */
    public void setAutoMirrored(boolean mirrored) {
    }
    /**
     * Tells if this Drawable will be automatically mirrored  when its layout direction is RTL
     * right-to-left. See {@link android.util.LayoutDirection}.
     *
     * @return boolean Returns true if this Drawable will be automatically mirrored.
     */
    public boolean isAutoMirrored() {
        return false;
    }
    /**
    為當(dāng)前Drawable實(shí)例和它的子實(shí)例應(yīng)用指定的主題
     * Applies the specified theme to this Drawable and its children.
     *
     * @param t the theme to apply
     */
    public void applyTheme(@NonNull @SuppressWarnings("unused") Theme t) {
        //空方法，Drawable子類會(huì)做自定義實(shí)現(xiàn)
    }
    public boolean canApplyTheme() {
        return false;
    }
    /**
    返回當(dāng)前Drawable實(shí)例的透明或者不透明磕蛇。返回值是其中之一：
     {@link android.graphics.PixelFormat#UNKNOWN}-透明度未知
     {@link android.graphics.PixelFormat#TRANSLUCENT}-半透明
     {@link android.graphics.PixelFormat#TRANSPARENT}-完全透明
     {@link android.graphics.PixelFormat#OPAQUE}-完全不透明
    如果Drawable中的內(nèi)容可見性不確定景描，最安全的方案
    是返回TRANSLUCENT/半透明
     
     * Return the opacity/transparency of this Drawable.  The returned value is
     * one of the abstract format constants in
     * {@link android.graphics.PixelFormat}:
     * {@link android.graphics.PixelFormat#UNKNOWN},
     * {@link android.graphics.PixelFormat#TRANSLUCENT},
     * {@link android.graphics.PixelFormat#TRANSPARENT}, or
     * {@link android.graphics.PixelFormat#OPAQUE}.
     *
     * <p>An OPAQUE drawable is one that draws all all content within its bounds, completely
     * covering anything behind the drawable. A TRANSPARENT drawable is one that draws nothing
     * within its bounds, allowing everything behind it to show through. A TRANSLUCENT drawable
     * is a drawable in any other state, where the drawable will draw some, but not all,
     * of the content within its bounds and at least some content behind the drawable will
     * be visible. If the visibility of the drawable's contents cannot be determined, the
     * safest/best return value is TRANSLUCENT.
     *
     * <p>Generally a Drawable should be as conservative as possible with the
     * value it returns.  For example, if it contains multiple child drawables
     * and only shows one of them at a time, if only one of the children is
     * TRANSLUCENT and the others are OPAQUE then TRANSLUCENT should be
     * returned.  You can use the method {@link #resolveOpacity} to perform a
     * standard reduction of two opacities to the appropriate single output.
     *
     * <p>Note that the returned value does not necessarily take into account a
     * custom alpha or color filter that has been applied by the client through
     * the {@link #setAlpha} or {@link #setColorFilter} methods. Some subclasses,
     * such as {@link BitmapDrawable}, {@link ColorDrawable}, and {@link GradientDrawable},
     * do account for the value of {@link #setAlpha}, but the general behavior is dependent
     * upon the implementation of the subclass.
     *
     * @return int The opacity class of the Drawable.
     *
     * @see android.graphics.PixelFormat
     */
    public abstract @PixelFormat.Opacity int getOpacity();
    /**
    根據(jù)兩個(gè)不透明度值，返回合適的值秀撇。
    兩個(gè)不透明度值若相等超棺，直接返回；
    否則如果兩個(gè)透明度值有至少一個(gè)是UNKNOWN呵燕，返回UNKNOWN棠绘；
    否則如果兩個(gè)透明度值有至少一個(gè)是TRANSLUCENT，返回TRANSLUCENT；
    否則如果兩個(gè)透明度值有至少一個(gè)是TRANSPARENT氧苍，返回TRANSPARENT夜矗；
    否則返回OPAQUE；
     * Return the appropriate opacity value for two source opacities.  If
     * either is UNKNOWN, that is returned; else, if either is TRANSLUCENT,
     * that is returned; else, if either is TRANSPARENT, that is returned;
     * else, OPAQUE is returned.
     *
     * <p>This is to help in implementing {@link #getOpacity}.
     *
     * @param op1 One opacity value.
     * @param op2 Another opacity value.
     *
     * @return int The combined opacity value.
     *
     * @see #getOpacity
     */
    public static @PixelFormat.Opacity int resolveOpacity(@PixelFormat.Opacity int op1,
            @PixelFormat.Opacity int op2) {
        if (op1 == op2) {
            return op1;
        }
        if (op1 == PixelFormat.UNKNOWN || op2 == PixelFormat.UNKNOWN) {
            return PixelFormat.UNKNOWN;
        }
        if (op1 == PixelFormat.TRANSLUCENT || op2 == PixelFormat.TRANSLUCENT) {
            return PixelFormat.TRANSLUCENT;
        }
        if (op1 == PixelFormat.TRANSPARENT || op2 == PixelFormat.TRANSPARENT) {
            return PixelFormat.TRANSPARENT;
        }
        return PixelFormat.OPAQUE;
    }
    /**
    返回在當(dāng)前Drawable實(shí)例中完全透明的一個(gè)區(qū)域让虐。
    這個(gè)區(qū)域可以用來影響繪制操作紊撕，定義當(dāng)前Drawable實(shí)例的目標(biāo)
    在渲染當(dāng)前Drawable實(shí)例時(shí)候哪個(gè)區(qū)域不需要改變。
     * Returns a Region representing the part of the Drawable that is completely
     * transparent.  This can be used to perform drawing operations, identifying
     * which parts of the target will not change when rendering the Drawable.
     * The default implementation returns null, indicating no transparent
     * region; subclasses can optionally override this to return an actual
     * Region if they want to supply this optimization information, but it is
     * not required that they do so.
     *
     * @return Returns null if the Drawables has no transparent region to
     * report, else a Region holding the parts of the Drawable's bounds that
     * are transparent.
     */
    public @Nullable Region getTransparentRegion() {
        return null;
    }
    /**
    如果子類需要根據(jù)state來變更Drawable實(shí)例的外觀赡突，則需要重寫該方法对扶。
    如果state的變更引起了Drawable實(shí)例外觀變化，則返回true,
    否則返回false;
     * Override this in your subclass to change appearance if you recognize the
     * specified state.
     *
     * @return Returns true if the state change has caused the appearance of
     * the Drawable to change (that is, it needs to be drawn), else false
     * if it looks the same and there is no need to redraw it since its
     * last state.
     */
    protected boolean onStateChange(int[] state) {
        return false;
    }
    /** 
    如果子類需要根據(jù)level來變更Drawable實(shí)例的外觀惭缰，則需要重寫該方法辩稽。
    如果level的變更引起了Drawable實(shí)例外觀變化，則返回true,
    否則返回false;
    Override this in your subclass to change appearance if you vary based
     *  on level.
     * @return Returns true if the level change has caused the appearance of
     * the Drawable to change (that is, it needs to be drawn), else false
     * if it looks the same and there is no need to redraw it since its
     * last level.
     */
    protected boolean onLevelChange(int level) {
        return false;
    }
    /**
    如果子類實(shí)例需要在繪制范圍發(fā)生變化后變更Drawable實(shí)例的外觀从媚，則需要重寫該方法。
     * Override this in your subclass to change appearance if you vary based on
     * the bounds.
     */
    protected void onBoundsChange(Rect bounds) {
        // Stub method.
    }
    /**
    返回當(dāng)前Drawable實(shí)例的實(shí)質(zhì)寬度患整。
    實(shí)質(zhì)寬度是Drawable實(shí)例占據(jù)的寬度拜效，包含padding值。
    如果Drawable實(shí)例沒有實(shí)際寬度各谚，例如是一個(gè)顏色紧憾，則返回-1
     * Returns the drawable's intrinsic width.
     * <p>
     * Intrinsic width is the width at which the drawable would like to be laid
     * out, including any inherent padding. If the drawable has no intrinsic
     * width, such as a solid color, this method returns -1.
     *
     * @return the intrinsic width, or -1 if no intrinsic width
     */
    public int getIntrinsicWidth() {
        return -1;
    }
    /**
    返回當(dāng)前Drawable實(shí)例的實(shí)質(zhì)高度。
    實(shí)質(zhì)寬度是Drawable實(shí)例占據(jù)的高度昌渤，包含padding值赴穗。
    如果Drawable實(shí)例沒有實(shí)際高度，例如是一個(gè)顏色膀息，則返回-1
     * Returns the drawable's intrinsic height.
     * <p>
     * Intrinsic height is the height at which the drawable would like to be
     * laid out, including any inherent padding. If the drawable has no
     * intrinsic height, such as a solid color, this method returns -1.
     *
     * @return the intrinsic height, or -1 if no intrinsic height
     */
    public int getIntrinsicHeight() {
        return -1;
    }
    /**
    返回當(dāng)前Drawable建議的最小寬度般眉。
    如果一個(gè)View實(shí)例用當(dāng)前Drawable當(dāng)做背景，那么建議該View實(shí)例
    寬度最小為這個(gè)值潜支。
     * Returns the minimum width suggested by this Drawable. If a View uses this
     * Drawable as a background, it is suggested that the View use at least this
     * value for its width. (There will be some scenarios where this will not be
     * possible.) This value should INCLUDE any padding.
     *
     * @return The minimum width suggested by this Drawable. If this Drawable
     *         doesn't have a suggested minimum width, 0 is returned.
     */
    public int getMinimumWidth() {
        final int intrinsicWidth = getIntrinsicWidth();
        return intrinsicWidth > 0 ? intrinsicWidth : 0;
    }
    /**
    返回當(dāng)前Drawable建議的最小高度甸赃。
    如果一個(gè)View實(shí)例用當(dāng)前Drawable當(dāng)做背景，那么建議該View實(shí)例
    高度最小為這個(gè)值冗酿。
     * Returns the minimum height suggested by this Drawable. If a View uses this
     * Drawable as a background, it is suggested that the View use at least this
     * value for its height. (There will be some scenarios where this will not be
     * possible.) This value should INCLUDE any padding.
     *
     * @return The minimum height suggested by this Drawable. If this Drawable
     *         doesn't have a suggested minimum height, 0 is returned.
     */
    public int getMinimumHeight() {
        final int intrinsicHeight = getIntrinsicHeight();
        return intrinsicHeight > 0 ? intrinsicHeight : 0;
    }
    /**
    將當(dāng)前Drawable實(shí)例的padding值作為參數(shù)設(shè)置為Recti實(shí)例padding
    的邊界值埠对。
    如果當(dāng)前實(shí)例有padding值，返回true,否則返回false裁替；
    當(dāng)返回false项玛，則Recti實(shí)例padding的邊界值都設(shè)置為0；
     * Return in padding the insets suggested by this Drawable for placing
     * content inside the drawable's bounds. Positive values move toward the
     * center of the Drawable (set Rect.inset).
     *
     * @return true if this drawable actually has a padding, else false. When false is returned,
     * the padding is always set to 0.
     */
    public boolean getPadding(@NonNull Rect padding) {
        padding.set(0, 0, 0, 0);
        return false;
    }
    /**
    被隱匿
     * Return in insets the layout insets suggested by this Drawable for use with alignment
     * operations during layout.
     * @hide
     */
    public @NonNull Insets getOpticalInsets() {
        return Insets.NONE;
    }

    /**
    調(diào)用此方法獲取當(dāng)前Drawable實(shí)例的繪制區(qū)域輪廓弱判。
    這個(gè)方法默認(rèn)被ViewOutlineProvider調(diào)用去定義View實(shí)例的輪廓襟沮。
    ViewOutlineProvider：后續(xù)文章會(huì)做介紹，是個(gè)蠻有趣的類。
     * Called to get the drawable to populate the Outline that defines its drawing area.
     * <p>
     * This method is called by the default {@link android.view.ViewOutlineProvider} to define
     * the outline of the View.
     * <p>
     * The default behavior defines the outline to be the bounding rectangle of 0 alpha.
     * Subclasses that wish to convey a different shape or alpha value must override this method.
     *
     * @see android.view.View#setOutlineProvider(android.view.ViewOutlineProvider)
     */
    public void getOutline(@NonNull Outline outline) {
        outline.setRect(getBounds());
        outline.setAlpha(0);
    }

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