MultiWindow实现窗口的层叠

最新推荐文章于 2025-03-13 16:52:59 发布

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最新推荐文章于 2025-03-13 16:52:59 发布

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分类专栏： Android 文章标签： android

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本文详细介绍了Android MultiWindow模式下如何实现窗口的层叠，主要关注ActivityStack的adjustStackFocus()方法，该方法在处理窗口焦点变化时起到关键作用。如果遇到疑问，作者建议参考其另一篇关于窗口实现逻辑的文章。

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android MultiWindow实现窗口的层叠

方法：ActivityStack adjustStackFocus(ActiviyRecord r, boolean newTask) {}

主要代码：

+            int parentStackId = HOME_STACK_ID;// 桌面 定义为： 0
+            int intentFlags = 0;
+
+            // FIXME: mContext is not merged into 5.1 originally.
+            boolean multiwindowEnabled = Settings.System.getInt(mService.mContext.getContentResolver(),
+                    TIETO_MULTIWINDOW_ENABLED, 0) != 0;
+            if (multiwindowEnabled && (r.intent != null)) {
+                r.intent.addFlags(Intent.FLAG_ACTIVITY_RUN_IN_WINDOW);
+            }
+
+            intentFlags = (r.intent != null) ? r.intent.getFlags() : 0;
+            boolean isMultiwindow = (intentFlags & Intent.FLAG_ACTIVITY_RUN_IN_WINDOW) != 0;
+            if (!isMultiwindow) {//上为false  --> 多窗口状态
+                final ActivityContainer container = r.mInitialActivityContainer;
+                if (container != null) {
+                    // The first time put it on the desired stack, after this put on task stack.
+                    r.mInitialActivityContainer = null;
+                    return container.mStack;
+                }
+
+                if (mFocusedStack != mHomeStack && (!newTask ||
+                        mFocusedStack.mActivityContainer.isEligibleForNewTasks())) {
+                    if (DEBUG_FOCUS || DEBUG_STACK) Slog.d(TAG,
+                            "adjustStackFocus: Have a focused stack=" + mFocusedStack);
+                    return mFocusedStack;//返回应用的焦点
+                }
+
+                final ArrayList<ActivityStack> homeDisplayStacks = mHomeStack.mStacks;
+                for (int stackNdx = homeDisplayStacks.size() - 1; stackNdx >= 0; --stackNdx) {//打开很多应用窗口
+                    final ActivityStack stack = homeDisplayStacks.get(stackNdx);
+                    if (!stack.isHomeStack()) { //不是桌面
+                        if (DEBUG_FOCUS || DEBUG_STACK) Slog.d(TAG,
+                                "adjustStackFocus: Setting focused stack=" + stack);
+                        mFocusedStack = stack;
+                        return mFocusedStack;
+                    }
+                }
+            }