Android 4.2中的操作栏图标大小

Question

Android 4.2中的操作栏图标大小是否已更改？我有一个120x48px HDPI图标,在Android 4.1及更低版本中完美呈现.它仍然是.

但是,在任何4.2设备上,它都被压缩到可以看到的48x48px.或类似的东西; 这绝对是一个广场.

有任何想法吗 ？谢谢 !

Answer 1

这并不理想,但看起来您可以使用自定义操作视图来解决此限制.

像这样的东西:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:id="@+id/log_in"
    android:title="Login"
    android:showAsAction="always"
    android:actionLayout="@layout/log_in_button"/>
</menu>

其中@ layout/log_in_button指向包含ImageButton的布局文件,并将您的图标设置为src.

您必须在OnCreateOptionsMenu方法中绑定单击侦听器.这里有一个很好的例子:http://developer.android.com/guide/topics/ui/actionbar.html#ActionView.

我刚才学会了使用这种方法,所以除了增加的复杂性之外,我还不知道是否有任何重大的挫折.

Answer 2

所以，我找到了一个答案，它有点hacky但有效（TM）：

总体思路是监听布局更改并将新边界应用于可绘制对象。这可能看起来像这样：

public static void updateActionBar(final Activity activity) {
        if (Build.VERSION.SDK_INT >= 17) {
            try {
                final View content = activity.findViewById(android.R.id.content);
                if (content instanceof FrameLayout) {
                    final FrameLayout contentFrameLayout = (FrameLayout) content;
                    final ViewParent parent = contentFrameLayout.getParent();
                    if (parent instanceof LinearLayout) {
                        final LinearLayout parentLinearLayout = (LinearLayout) parent;
                        final Class<?> actionBarContainerClass = Class.forName("com.android.internal.widget.ActionBarContainer");
                        final Class<?> actionBarViewClass = Class.forName("com.android.internal.widget.ActionBarView");
                        final Class<?> actionMenuViewClass = Class.forName("com.android.internal.view.menu.ActionMenuView");
                        final Class<?> actionMenuItemViewClass = Class.forName("com.android.internal.view.menu.ActionMenuItemView");

                        for (int i = 0, childCount = parentLinearLayout.getChildCount(); i < childCount; i++) {
                            final View parentLinearLayoutChild = parentLinearLayout.getChildAt(i);
                            handleParentLinearLayoutChild(actionBarContainerClass, actionBarViewClass, actionMenuViewClass, actionMenuItemViewClass, parentLinearLayoutChild);
                        }
                    }
                }
            } catch (Exception e) {
                // Handle or ignore
            }
        }
    }

    private static void handleParentLinearLayoutChild(final Class<?> actionBarContainerClass, final Class<?> actionBarViewClass, final Class<?> actionMenuViewClass, final Class<?> actionMenuItemViewClass, final View parentLinearLayoutChild) {
        if (parentLinearLayoutChild instanceof FrameLayout && parentLinearLayoutChild.getClass().equals(actionBarContainerClass)) {
            final FrameLayout actionBarContainer = (FrameLayout) parentLinearLayoutChild;
            for (int i = 0, actionBarContainerChildCount = actionBarContainer.getChildCount(); i < actionBarContainerChildCount; i++) {
                final View actionBarContainerChild = actionBarContainer.getChildAt(i);
                handleActionBarContainerChild(actionBarViewClass, actionMenuViewClass, actionMenuItemViewClass, actionBarContainerChild);
            }
        }
    }

    private static void handleActionBarContainerChild(final Class<?> actionBarViewClass, final Class<?> actionMenuViewClass, final Class<?> actionMenuItemViewClass, final View actionBarContainerChild) {
        if (actionBarContainerChild instanceof ViewGroup && actionBarContainerChild.getClass().equals(actionBarViewClass)) {
            final ViewGroup actionBarView = (ViewGroup) actionBarContainerChild;
            actionBarView.setOnHierarchyChangeListener(new ViewGroup.OnHierarchyChangeListener() {
                @Override
                public void onChildViewAdded(final View parent, final View child) {
                    handleActionBarViewChild(child, actionMenuViewClass, actionMenuItemViewClass);
                }

                @Override
                public void onChildViewRemoved(final View parent, final View child) {
                }
            });
            for (int i = 0, actionBarViewCount = actionBarView.getChildCount(); i < actionBarViewCount; i++) {
                handleActionBarViewChild(actionBarView.getChildAt(i3), actionMenuViewClass, actionMenuItemViewClass);
            }
        }
    }

    private static void handleActionBarViewChild(final View child, final Class<?> actionMenuViewClass, final Class<?> actionMenuItemViewClass) {
        try {
            if (child instanceof LinearLayout && child.getClass().equals(actionMenuViewClass)) {
                final LinearLayout actionMenuView = (LinearLayout) child;
                actionMenuView.setOnHierarchyChangeListener(new ViewGroup.OnHierarchyChangeListener() {
                    @Override
                    public void onChildViewAdded(final View parent, final View child) {
                        handleActionMenuViewChild(child, actionMenuItemViewClass);
                    }

                    @Override
                    public void onChildViewRemoved(final View parent, final View child) {
                    }
                });
                for (int i = 0, actionMenuViewCount = actionMenuView.getChildCount(); i < actionMenuViewCount; i++) {
                    handleActionMenuViewChild(actionMenuView.getChildAt(i), actionMenuItemViewClass);
                }
            }
        } catch (Exception e) {
            // Handle or ignore
        }
    }

    private static void handleActionMenuViewChild(final View child, final Class<?> actionMenuItemViewClass) {
        try {
            if (child instanceof TextView && child.getClass().equals(actionMenuItemViewClass)) {
                final TextView menuViewChild = (TextView) child;
                final Drawable[] compoundDrawables = menuViewChild.getCompoundDrawables();
                final Drawable leftDrawable = compoundDrawables[0];
                final int intrinsicWidth = leftDrawable.getIntrinsicWidth();
                final int intrinsicHeight = leftDrawable.getIntrinsicHeight();
                leftDrawable.setBounds(0, 0, intrinsicWidth , intrinsicHeight );
                menuViewChild.setCompoundDrawables(leftDrawable, null, null, null);
                menuViewChild.setPadding(menuViewChild.getPaddingLeft(), 0, menuViewChild.getPaddingRight(), 0);
                menuViewChild.invalidate();
                menuViewChild.requestLayout();
            }
        } catch (Exception e) {
            // Handle or ignore
        }
    }

然后，您必须在以下回调中的每个 Activity 中调用 updateActionBar （我建议创建一个从中扩展的抽象基本活动）： onCreate onMenuOpened （我发现如果您调用，它会提高性能并减少闪烁（可绘制对象的大小变化）这个延迟（例如200毫秒））onPrepareOptionsMenu（我发现如果你调用这个延迟（例如200毫秒），它会提高性能并减少闪烁（可绘制的大小变化））

这适用于我在 Android 4.2 的 Nexus 7 和 Nexus 10 上。您可以预期它会在未来的更新中失败，但至少目前它似乎有效。