activity window

源码－PhoneWindow.java

@Override
    public void setContentView(int layoutResID) {
        if (mContentParent == null) {  //mContentParent为空，创建一个DecorView
            installDecor();
        } else {
            mContentParent.removeAllViews(); //mContentParent不为空，删除其中的View
        }
        mLayoutInflater.inflate(layoutResID, mContentParent); //为mContentParent添加子View, 即Activity中设置的布局文件
        final Callback cb = getCallback();
        if (cb != null && !isDestroyed()) {
            cb.onContentChanged();
        }
    }

private void installDecor() {
        if (mDecor == null) {
            mDecor = generateDecor(); //生成DecorView
            mDecor.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
            mDecor.setIsRootNamespace(true);
        }
        if (mContentParent == null) {
            mContentParent = generateLayout(mDecor); //为DecorView设置布局格式，并返回mContentParent
            mTitleView = (TextView)findViewById(com.android.internal.R.id.title);
            if (mTitleView != null) {
                if ((getLocalFeatures() & (1 << FEATURE_NO_TITLE)) != 0) {
                    View titleContainer = findViewById(com.android.internal.R.id.title_container);
                    if (titleContainer != null) {
                        titleContainer.setVisibility(View.GONE);
                    } else {
                        mTitleView.setVisibility(View.GONE);
                    }
                    if (mContentParent instanceof FrameLayout) {
                        ((FrameLayout)mContentParent).setForeground(null);
                    }
                } else {
                    mTitleView.setText(mTitle);
                }
            } else {
                mActionBar = (ActionBarView) findViewById(com.android.internal.R.id.action_bar);
                if (mActionBar != null) {
                    if (mActionBar.getTitle() == null) {
                        mActionBar.setWindowTitle(mTitle);
                    }
                    final int localFeatures = getLocalFeatures();
                    if ((localFeatures & (1 << FEATURE_PROGRESS)) != 0) {
                        mActionBar.initProgress();
                    }
                    if ((localFeatures & (1 << FEATURE_INDETERMINATE_PROGRESS)) != 0) {
                        mActionBar.initIndeterminateProgress();
                    }
                    // Post the panel invalidate for later; avoid application onCreateOptionsMenu
                    // being called in the middle of onCreate or similar.
                    mDecor.post(new Runnable() {
                        public void run() {
                            if (!isDestroyed()) {
                                invalidatePanelMenu(FEATURE_ACTION_BAR);
                            }
                        }
                    });
                }
            }
        }
    }

protected DecorView generateDecor() {
        return new DecorView(getContext(), -1);
    }

    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 < com.android.internal.R.styleable.Window.length; i++) {
                s = s + " " + Integer.toHexString(com.android.internal.R.styleable.Window[i]) + "="
                        + a.getString(i);
            }
            System.out.println(s);
        }
        mIsFloating = a.getBoolean(com.android.internal.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(com.android.internal.R.styleable.Window_windowNoTitle, false)) {
            requestFeature(FEATURE_NO_TITLE);
        } else if (a.getBoolean(com.android.internal.R.styleable.Window_windowActionBar, false)) {
            // Don't allow an action bar if there is no title.
            requestFeature(FEATURE_ACTION_BAR);
        }
        if (a.getBoolean(com.android.internal.R.styleable.Window_windowActionBarOverlay, false)) {
            requestFeature(FEATURE_ACTION_BAR_OVERLAY);
        }
        if (a.getBoolean(com.android.internal.R.styleable.Window_windowActionModeOverlay, false)) {
            requestFeature(FEATURE_ACTION_MODE_OVERLAY);
        }

        ...

        WindowManager.LayoutParams params = getAttributes();
        if (!hasSoftInputMode()) {
            params.softInputMode = a.getInt(
                    com.android.internal.R.styleable.Window_windowSoftInputMode,
                    params.softInputMode);
        }
       ...

        // Inflate the window decor.
        int layoutResource;
        int features = getLocalFeatures();
        // System.out.println("Features: 0x" + Integer.toHexString(features));
        if ((features & ((1 << FEATURE_LEFT_ICON) | (1 << FEATURE_RIGHT_ICON))) != 0) {
            if (mIsFloating) {
                TypedValue res = new TypedValue();
                getContext().getTheme().resolveAttribute(
                        com.android.internal.R.attr.dialogTitleIconsDecorLayout, res, true);
                layoutResource = res.resourceId;
            } else {
                layoutResource = com.android.internal.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 = com.android.internal.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(
                        com.android.internal.R.attr.dialogCustomTitleDecorLayout, res, true);
                layoutResource = res.resourceId;
            } else {
                layoutResource = com.android.internal.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(
                        com.android.internal.R.attr.dialogTitleDecorLayout, res, true);
                layoutResource = res.resourceId;
            } else if ((features & (1 << FEATURE_ACTION_BAR)) != 0) {
                if ((features & (1 << FEATURE_ACTION_BAR_OVERLAY)) != 0) {
                    layoutResource = com.android.internal.R.layout.screen_action_bar_overlay;
                } else {
                    layoutResource = com.android.internal.R.layout.screen_action_bar;
                }
            } else {
                layoutResource = com.android.internal.R.layout.screen_title;
            }
            // System.out.println("Title!");
        } else {
            // Embedded, so no decoration is needed.
            layoutResource = com.android.internal.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));
        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);
            }
        }
        // Remaining setup -- of background and title -- that only applies
        // to top-level windows.
        if (getContainer() == null) {
            Drawable drawable = mBackgroundDrawable;
            if (mBackgroundResource != 0) {
                drawable = getContext().getResources().getDrawable(mBackgroundResource);
            }
            mDecor.setWindowBackground(drawable);
            drawable = null;
            if (mFrameResource != 0) {
                drawable = getContext().getResources().getDrawable(mFrameResource);
            }
            mDecor.setWindowFrame(drawable);
            // System.out.println("Text=" + Integer.toHexString(mTextColor) +
            // " Sel=" + Integer.toHexString(mTextSelectedColor) +
            // " Title=" + Integer.toHexString(mTitleColor));
            if (mTitleColor == 0) {
                mTitleColor = mTextColor;
            }
            if (mTitle != null) {
                setTitle(mTitle);
            }
            setTitleColor(mTitleColor);
        }
        mDecor.finishChanging();
        return contentParent;
    }