從setContentView開始分析view的加載過程一

疑問1：setContentView到底做了些什么锋谐，為什么調(diào)用后就可以顯示出我們想要的布局頁面遍尺？
疑問2：PhoneWindow倒是什么東西？Window和它是什么關(guān)系涮拗？
疑問3：DecorView是干什么用的乾戏？和我們的布局又有什么樣的關(guān)系
疑問4：requestFeature為什么要在setContentView之前調(diào)用迂苛？

首先我們提出了以上幾個疑問，在這里我一點(diǎn)需要說明鼓择，就是說大家在研讀Android源碼的時候一定要帶著問題去讀三幻，否則就很容易走偏陷入源碼無法自拔了。一個問題就是一條線索這樣我們看源碼得而效率會更高呐能。
廢話不多說念搬，我們先來看一下第一個問題。

疑問1：

setContentView方法我們并不陌生摆出，但是又有多少人考慮過其背后的工作原理呢朗徊？我們隨便新建一個Activity，繼承Activity而不是AppCompatActivity調(diào)用setContentView方法偎漫，好了進(jìn)入到setContentView方法

/**
* Set the activity content from a layout resource.  The resource will be
* inflated, adding all top-level views to the activity.
*
* @param layoutResID Resource ID to be inflated.
*
* @see #setContentView(android.view.View)
* @see #setContentView(android.view.View, android.view.ViewGroup.LayoutParams)
*/
public void setContentView(@LayoutRes int layoutResID) {
    getWindow().setContentView(layoutResID);
    initWindowDecorActionBar();
}

可以看到Activity的setContentView方法代碼很簡單爷恳，它調(diào)用了getWindow.setContentView并將xml文件作為參數(shù)繼續(xù)向下傳遞，getWindow其實就是Window對象象踊。也就是說xml文件被傳遞到了Window的setContentView方法中去做進(jìn)一步的處理温亲，Window類是一個抽象的類PhoneWindow類是Window的唯一實現(xiàn)類。在PhoneWindow類中setContentView方法重載有三個杯矩，我們就只看這個就好了

@Override
public void setContentView(int layoutResID) {
    // Note: FEATURE_CONTENT_TRANSITIONS may be set in the process of installing the window
    // decor, when theme attributes and the like are crystalized. Do not check the feature
    // before this happens.
    if (mContentParent == null) {
        installDecor();
    } else if (!hasFeature(FEATURE_CONTENT_TRANSITIONS)) {
        mContentParent.removeAllViews();
    }

    if (hasFeature(FEATURE_CONTENT_TRANSITIONS)) {
        final Scene newScene = Scene.getSceneForLayout(mContentParent, layoutResID,
                getContext());
        transitionTo(newScene);
    } else {
        mLayoutInflater.inflate(layoutResID, mContentParent);
    }
    mContentParent.requestApplyInsets();
    final Callback cb = getCallback();
    if (cb != null && !isDestroyed()) {
        cb.onContentChanged();
    }
}

代碼的解構(gòu)很清晰栈虚，首先判斷mContentParent是不是空如果是就調(diào)用installDecor()，如果不是則調(diào)用mContentParent.removeAllViews()來清空所有的子view菊碟，注意mContentParent是DecorView的子View节芥，最后調(diào)用mLayoutInflater.inflate(layoutResID, mContentParent)來加載布局文件，寫到這是不是覺得很熟悉逆害？我們在Adapter不是經(jīng)常這么干头镊？所以說setContentView()方法的到最后還是要利用LayoutInflater來加載布局文件！

疑問2:疑問1中已經(jīng)回答

疑問3：
DecorView是PhoneWindow類的一個內(nèi)部類魄幕，繼承了FrameLayout因此說DecorView是一個View不為過相艇，更準(zhǔn)確的是說是一個ViewGroup。DecorView有且僅有一個子View就是mContentParent纯陨，那么DecorView對象是何時創(chuàng)建的呢坛芽？這個問題先不急我們繼續(xù)看疑問4.

疑問4：
為什么requestFeature為什么要在setContentView之前調(diào)用？在上文當(dāng)中我們提到了一個mContentParent翼抠，它是DecorView的子類智蝠“胁粒可以說我們的主題是什么樣子就取決于這個mContentParent，為此我們展開探索在setContentView方法中調(diào)用了installDecor();我們看下這個方法代碼

private void installDecor() {
    if (mDecor == null) {
        mDecor = generateDecor();
        mDecor.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
        mDecor.setIsRootNamespace(true);
        if (!mInvalidatePanelMenuPosted && mInvalidatePanelMenuFeatures != 0) {
            mDecor.postOnAnimation(mInvalidatePanelMenuRunnable);
        }
    }
    if (mContentParent == null) {
        mContentParent = generateLayout(mDecor);

        // Set up decor part of UI to ignore fitsSystemWindows if appropriate.
        mDecor.makeOptionalFitsSystemWindows();

        final DecorContentParent decorContentParent = (DecorContentParent) mDecor.findViewById(
                R.id.decor_content_parent);

        if (decorContentParent != null) {
            mDecorContentParent = decorContentParent;
            mDecorContentParent.setWindowCallback(getCallback());
            if (mDecorContentParent.getTitle() == null) {
                mDecorContentParent.setWindowTitle(mTitle);
            }

            final int localFeatures = getLocalFeatures();
            for (int i = 0; i < FEATURE_MAX; i++) {
                if ((localFeatures & (1 << i)) != 0) {
                    mDecorContentParent.initFeature(i);
                }
            }     
        }
        //代碼省略        
    }
}

有兩個地方是我們要注意的mDecor = generateDecor();和mContentParent = generateLayout(mDecor);，generateDecor()方法是用來創(chuàng)建DecorView對象的也就是說到這我們的DecorView對象就算是真的創(chuàng)建出來了悍汛，然后就是mContentParent的實例化丑瞧。generateLayout()方法是我們加載主題的地方

protected ViewGroup generateLayout(DecorView decor) {
    // Apply data from current theme.

    TypedArray a = getWindowStyle();

    if (false) {
        System.out.println("From style:");
        String s = "Attrs:";
        for (int i = 0; i < R.styleable.Window.length; i++) {
            s = s + " " + Integer.toHexString(R.styleable.Window[i]) + "="
                    + a.getString(i);
        }
        System.out.println(s);
    }

    mIsFloating = a.getBoolean(R.styleable.Window_windowIsFloating, false);
    int flagsToUpdate = (FLAG_LAYOUT_IN_SCREEN|FLAG_LAYOUT_INSET_DECOR)
            & (~getForcedWindowFlags());
    if (mIsFloating) {
        setLayout(WRAP_CONTENT, WRAP_CONTENT);
        setFlags(0, flagsToUpdate);
    } else {
        setFlags(FLAG_LAYOUT_IN_SCREEN|FLAG_LAYOUT_INSET_DECOR, flagsToUpdate);
    }

    if (a.getBoolean(R.styleable.Window_windowNoTitle, false)) {
        requestFeature(FEATURE_NO_TITLE);
    } else if (a.getBoolean(R.styleable.Window_windowActionBar, false)) {
        // Don't allow an action bar if there is no title.
        requestFeature(FEATURE_ACTION_BAR);
    }

    if (a.getBoolean(R.styleable.Window_windowActionBarOverlay, false)) {
        requestFeature(FEATURE_ACTION_BAR_OVERLAY);
    }

    if (a.getBoolean(R.styleable.Window_windowActionModeOverlay, false)) {
        requestFeature(FEATURE_ACTION_MODE_OVERLAY);
    }

    if (a.getBoolean(R.styleable.Window_windowSwipeToDismiss, false)) {
        requestFeature(FEATURE_SWIPE_TO_DISMISS);
    }

    if (a.getBoolean(R.styleable.Window_windowFullscreen, false)) {
        setFlags(FLAG_FULLSCREEN, FLAG_FULLSCREEN & (~getForcedWindowFlags()));
    }

    if (a.getBoolean(R.styleable.Window_windowTranslucentStatus,
            false)) {
        setFlags(FLAG_TRANSLUCENT_STATUS, FLAG_TRANSLUCENT_STATUS
                & (~getForcedWindowFlags()));
    }

    if (a.getBoolean(R.styleable.Window_windowTranslucentNavigation,
            false)) {
        setFlags(FLAG_TRANSLUCENT_NAVIGATION, FLAG_TRANSLUCENT_NAVIGATION
                & (~getForcedWindowFlags()));
    }

    if (a.getBoolean(R.styleable.Window_windowOverscan, false)) {
        setFlags(FLAG_LAYOUT_IN_OVERSCAN, FLAG_LAYOUT_IN_OVERSCAN&(~getForcedWindowFlags()));
    }

    if (a.getBoolean(R.styleable.Window_windowShowWallpaper, false)) {
        setFlags(FLAG_SHOW_WALLPAPER, FLAG_SHOW_WALLPAPER&(~getForcedWindowFlags()));
    }

    if (a.getBoolean(R.styleable.Window_windowEnableSplitTouch,
            getContext().getApplicationInfo().targetSdkVersion
                    >= android.os.Build.VERSION_CODES.HONEYCOMB)) {
        setFlags(FLAG_SPLIT_TOUCH, FLAG_SPLIT_TOUCH&(~getForcedWindowFlags()));
    }

    a.getValue(R.styleable.Window_windowMinWidthMajor, mMinWidthMajor);
    a.getValue(R.styleable.Window_windowMinWidthMinor, mMinWidthMinor);
    if (a.hasValue(R.styleable.Window_windowFixedWidthMajor)) {
        if (mFixedWidthMajor == null) mFixedWidthMajor = new TypedValue();
        a.getValue(R.styleable.Window_windowFixedWidthMajor,
                mFixedWidthMajor);
    }
    if (a.hasValue(R.styleable.Window_windowFixedWidthMinor)) {
        if (mFixedWidthMinor == null) mFixedWidthMinor = new TypedValue();
        a.getValue(R.styleable.Window_windowFixedWidthMinor,
                mFixedWidthMinor);
    }
    if (a.hasValue(R.styleable.Window_windowFixedHeightMajor)) {
        if (mFixedHeightMajor == null) mFixedHeightMajor = new TypedValue();
        a.getValue(R.styleable.Window_windowFixedHeightMajor,
                mFixedHeightMajor);
    }
    if (a.hasValue(R.styleable.Window_windowFixedHeightMinor)) {
        if (mFixedHeightMinor == null) mFixedHeightMinor = new TypedValue();
        a.getValue(R.styleable.Window_windowFixedHeightMinor,
                mFixedHeightMinor);
    }
    if (a.getBoolean(R.styleable.Window_windowContentTransitions, false)) {
        requestFeature(FEATURE_CONTENT_TRANSITIONS);
    }
    if (a.getBoolean(R.styleable.Window_windowActivityTransitions, false)) {
        requestFeature(FEATURE_ACTIVITY_TRANSITIONS);
    }

    final Context context = getContext();
    final int targetSdk = context.getApplicationInfo().targetSdkVersion;
    final boolean targetPreHoneycomb = targetSdk < android.os.Build.VERSION_CODES.HONEYCOMB;
    final boolean targetPreIcs = targetSdk < android.os.Build.VERSION_CODES.ICE_CREAM_SANDWICH;
    final boolean targetPreL = targetSdk < android.os.Build.VERSION_CODES.LOLLIPOP;
    final boolean targetHcNeedsOptions = context.getResources().getBoolean(
            R.bool.target_honeycomb_needs_options_menu);
    final boolean noActionBar = !hasFeature(FEATURE_ACTION_BAR) || hasFeature(FEATURE_NO_TITLE);

    if (targetPreHoneycomb || (targetPreIcs && targetHcNeedsOptions && noActionBar)) {
        setNeedsMenuKey(WindowManager.LayoutParams.NEEDS_MENU_SET_TRUE);
    } else {
        setNeedsMenuKey(WindowManager.LayoutParams.NEEDS_MENU_SET_FALSE);
    }

    // Non-floating windows on high end devices must put up decor beneath the system bars and
    // therefore must know about visibility changes of those.
    if (!mIsFloating && ActivityManager.isHighEndGfx()) {
        if (!targetPreL && a.getBoolean(
                R.styleable.Window_windowDrawsSystemBarBackgrounds,
                false)) {
            setFlags(FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS,
                    FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS & ~getForcedWindowFlags());
        }
    }
    if (!mForcedStatusBarColor) {
        mStatusBarColor = a.getColor(R.styleable.Window_statusBarColor, 0xFF000000);
    }
    if (!mForcedNavigationBarColor) {
        mNavigationBarColor = a.getColor(R.styleable.Window_navigationBarColor, 0xFF000000);
    }
    if (a.getBoolean(R.styleable.Window_windowLightStatusBar, false)) {
        decor.setSystemUiVisibility(
                decor.getSystemUiVisibility() | View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR);
    }

    if (mAlwaysReadCloseOnTouchAttr || getContext().getApplicationInfo().targetSdkVersion
            >= android.os.Build.VERSION_CODES.HONEYCOMB) {
        if (a.getBoolean(
                R.styleable.Window_windowCloseOnTouchOutside,
                false)) {
            setCloseOnTouchOutsideIfNotSet(true);
        }
    }

    WindowManager.LayoutParams params = getAttributes();

    if (!hasSoftInputMode()) {
        params.softInputMode = a.getInt(
                R.styleable.Window_windowSoftInputMode,
                params.softInputMode);
    }

    if (a.getBoolean(R.styleable.Window_backgroundDimEnabled,
            mIsFloating)) {
        /* All dialogs should have the window dimmed */
        if ((getForcedWindowFlags()&WindowManager.LayoutParams.FLAG_DIM_BEHIND) == 0) {
            params.flags |= WindowManager.LayoutParams.FLAG_DIM_BEHIND;
        }
        if (!haveDimAmount()) {
            params.dimAmount = a.getFloat(
                    android.R.styleable.Window_backgroundDimAmount, 0.5f);
        }
    }

    if (params.windowAnimations == 0) {
        params.windowAnimations = a.getResourceId(
                R.styleable.Window_windowAnimationStyle, 0);
    }

    // The rest are only done if this window is not embedded; otherwise,
    // the values are inherited from our container.
    if (getContainer() == null) {
        if (mBackgroundDrawable == null) {
            if (mBackgroundResource == 0) {
                mBackgroundResource = a.getResourceId(
                        R.styleable.Window_windowBackground, 0);
            }
            if (mFrameResource == 0) {
                mFrameResource = a.getResourceId(R.styleable.Window_windowFrame, 0);
            }
            mBackgroundFallbackResource = a.getResourceId(
                    R.styleable.Window_windowBackgroundFallback, 0);
            if (false) {
                System.out.println("Background: "
                        + Integer.toHexString(mBackgroundResource) + " Frame: "
                        + Integer.toHexString(mFrameResource));
            }
        }
        mElevation = a.getDimension(R.styleable.Window_windowElevation, 0);
        mClipToOutline = a.getBoolean(R.styleable.Window_windowClipToOutline, false);
        mTextColor = a.getColor(R.styleable.Window_textColor, Color.TRANSPARENT);
    }

    // Inflate the window decor.

    int layoutResource;
    int features = getLocalFeatures();
    // System.out.println("Features: 0x" + Integer.toHexString(features));
    if ((features & (1 << FEATURE_SWIPE_TO_DISMISS)) != 0) {
        layoutResource = R.layout.screen_swipe_dismiss;
    } else if ((features & ((1 << FEATURE_LEFT_ICON) | (1 << FEATURE_RIGHT_ICON))) != 0) {
        if (mIsFloating) {
            TypedValue res = new TypedValue();
            getContext().getTheme().resolveAttribute(
                    R.attr.dialogTitleIconsDecorLayout, res, true);
            layoutResource = res.resourceId;
        } else {
            layoutResource = R.layout.screen_title_icons;
        }
        // XXX Remove this once action bar supports these features.
        removeFeature(FEATURE_ACTION_BAR);
        // System.out.println("Title Icons!");
    } else if ((features & ((1 << FEATURE_PROGRESS) | (1 << FEATURE_INDETERMINATE_PROGRESS))) != 0
            && (features & (1 << FEATURE_ACTION_BAR)) == 0) {
        // Special case for a window with only a progress bar (and title).
        // XXX Need to have a no-title version of embedded windows.
        layoutResource = R.layout.screen_progress;
        // System.out.println("Progress!");
    } else if ((features & (1 << FEATURE_CUSTOM_TITLE)) != 0) {
        // Special case for a window with a custom title.
        // If the window is floating, we need a dialog layout
        if (mIsFloating) {
            TypedValue res = new TypedValue();
            getContext().getTheme().resolveAttribute(
                    R.attr.dialogCustomTitleDecorLayout, res, true);
            layoutResource = res.resourceId;
        } else {
            layoutResource = R.layout.screen_custom_title;
        }
        // XXX Remove this once action bar supports these features.
        removeFeature(FEATURE_ACTION_BAR);
    } else if ((features & (1 << FEATURE_NO_TITLE)) == 0) {
        // If no other features and not embedded, only need a title.
        // If the window is floating, we need a dialog layout
        if (mIsFloating) {
            TypedValue res = new TypedValue();
            getContext().getTheme().resolveAttribute(
                    R.attr.dialogTitleDecorLayout, res, true);
            layoutResource = res.resourceId;
        } else if ((features & (1 << FEATURE_ACTION_BAR)) != 0) {
            layoutResource = a.getResourceId(
                    R.styleable.Window_windowActionBarFullscreenDecorLayout,
                    R.layout.screen_action_bar);
        } else {
            layoutResource = R.layout.screen_title;
        }
        // System.out.println("Title!");
    } else if ((features & (1 << FEATURE_ACTION_MODE_OVERLAY)) != 0) {
        layoutResource = R.layout.screen_simple_overlay_action_mode;
    } else {
        // Embedded, so no decoration is needed.
        layoutResource = R.layout.screen_simple;
        // System.out.println("Simple!");
    }

    mDecor.startChanging();

    View in = mLayoutInflater.inflate(layoutResource, null);
    decor.addView(in, new ViewGroup.LayoutParams(MATCH_PARENT, MATCH_PARENT));
    mContentRoot = (ViewGroup) in;

    ViewGroup contentParent = (ViewGroup)findViewById(ID_ANDROID_CONTENT);
    if (contentParent == null) {
        throw new RuntimeException("Window couldn't find content container view");
    }

    if ((features & (1 << FEATURE_INDETERMINATE_PROGRESS)) != 0) {
        ProgressBar progress = getCircularProgressBar(false);
        if (progress != null) {
            progress.setIndeterminate(true);
        }
    }

    if ((features & (1 << FEATURE_SWIPE_TO_DISMISS)) != 0) {
        registerSwipeCallbacks();
    }

    // Remaining setup -- of background and title -- that only applies
    // to top-level windows.
    if (getContainer() == null) {
        final Drawable background;
        if (mBackgroundResource != 0) {
            background = getContext().getDrawable(mBackgroundResource);
        } else {
            background = mBackgroundDrawable;
        }
        mDecor.setWindowBackground(background);

        final Drawable frame;
        if (mFrameResource != 0) {
            frame = getContext().getDrawable(mFrameResource);
        } else {
            frame = null;
        }
        mDecor.setWindowFrame(frame);

        mDecor.setElevation(mElevation);
        mDecor.setClipToOutline(mClipToOutline);

        if (mTitle != null) {
            setTitle(mTitle);
        }

        if (mTitleColor == 0) {
            mTitleColor = mTextColor;
        }
        setTitleColor(mTitleColor);
    }

    mDecor.finishChanging();

    return contentParent;
}

好了經(jīng)過以上分析，我們得出結(jié)論Window的主題設(shè)置要經(jīng)過setContentView()、installDecor()最后generateLayout()帅矗，那么現(xiàn)在我們就可以來回答疑問4了，當(dāng)setContentView()方法之后主題已經(jīng)被設(shè)定好了煞烫，我們再要想去修改主題就自然沒有了效果浑此。

最后編輯于：2017.12.07 03:16:20

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