除去周围的操作栏填充左图标在Android 4.0+ [英] remove padding around action bar left icon on Android 4.0+

问题描述

我想删除填充该图标左边的标准Android 4.0+行动起来吧。我设置的图标有：

I want to remove the padding around the icon on the left in the standard android 4.0+ action bar. I'm setting the icon with:

getActionBar().setIcon(getResources().getDrawable(R.drawable.ic_action_myapp));

和我想的图标垂直，以填补空间，触及底部和顶部，类似于soundcloud应用程序的功能：

And I would like the icon to fill vertically the space, touching both top and bottom, similar to what soundcloud app does:

推荐答案

挖掘到AOSP源，它似乎参与了code是在<一个href="https://github.com/android/platform_frameworks_base/blob/master/core/java/com/android/internal/widget/ActionBarView.java"><$c$c>com.android.internal.widget.ActionBarView.java.特别是有关的部分是内部类 ActionBarView $ HomeView 的 onLayout（）方法，部分报道如下（线1433年至1478年）：

Digging into AOSP sources, it seems the code involved is in com.android.internal.widget.ActionBarView.java. In particular the relevant part is the onLayout() method of the inner class ActionBarView$HomeView, partially reported below (lines 1433-1478):

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        ...
        final LayoutParams iconLp = (LayoutParams) mIconView.getLayoutParams();
        final int iconHeight = mIconView.getMeasuredHeight();
        final int iconWidth = mIconView.getMeasuredWidth();
        final int hCenter = (r - l) / 2;
        final int iconTop = Math.max(iconLp.topMargin, vCenter - iconHeight / 2);
        final int iconBottom = iconTop + iconHeight;
        final int iconLeft;
        final int iconRight;
        int marginStart = iconLp.getMarginStart();
        final int delta = Math.max(marginStart, hCenter - iconWidth / 2);
        if (isLayoutRtl) {
            iconRight = width - upOffset - delta;
            iconLeft = iconRight - iconWidth;
        } else {
            iconLeft = upOffset + delta;
            iconRight = iconLeft + iconWidth;
        }
        mIconView.layout(iconLeft, iconTop, iconRight, iconBottom);
    }

同样的部件使用此布局，在<定义href="https://github.com/android/platform_frameworks_base/blob/master/core/res/res/layout/action_bar_home.xml"><$c$c>res/layout/action_bar_home.xml:

<view xmlns:android="http://schemas.android.com/apk/res/android"
  class="com.android.internal.widget.ActionBarView$HomeView"
  android:layout_width="wrap_content"
  android:layout_height="match_parent">
<ImageView android:id="@android:id/up"
           android:src="?android:attr/homeAsUpIndicator"
           android:layout_gravity="center_vertical|start"
           android:visibility="gone"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_marginEnd="-8dip" />
<ImageView android:id="@android:id/home"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_marginEnd="8dip"
           android:layout_marginTop="@android:dimen/action_bar_icon_vertical_padding"
           android:layout_marginBottom="@android:dimen/action_bar_icon_vertical_padding"
           android:layout_gravity="center"
           android:adjustViewBounds="true"
           android:scaleType="fitCenter" />
</view>

据消息人士透露的图标显示在的ImageView 与ID = android.R.id.home 。上述报告的 onLayout（）方法考虑在布局中定义的的ImageView 的利润，不能设置通过主题/样式替代，因为他们使用的值 @android：扪/ action_bar_icon_vertical_padding

According to sources the icon is shown in the Imageview with id=android.R.id.home. The onLayout() method reported above takes account of the ImageView margins defined in the layout, which can't be set via theme/style override because they use the value @android:dimen/action_bar_icon_vertical_padding.

所有你能做的就是要摆脱这些值在运行时，并根据您的需要设置它们： 简单地检索的ImageView 并设置它的顶部和底部边距 0 。事情是这样的：

All you can do is to get rid of those values at runtime, and set them according your needs: simply retrieve the ImageView and set its top and bottom margins to 0. Something like this:

ImageView icon = (ImageView) findViewById(android.R.id.home);
FrameLayout.LayoutParams iconLp = (FrameLayout.LayoutParams) icon.getLayoutParams();
iconLp.topMargin = iconLp.bottomMargin = 0;
icon.setLayoutParams( iconLp );

编辑：我刚刚意识到我没有涉及如何摆脱左填充的。下面的解决方案。

在动作条左填充，受之的 向上导航 的动作条图标的行为。当被禁用（通过 ActionBar.setDisplayHomeAsUpEnabled（假））的左/上指示走了，但左填充被使用。一个简单的解决办法：

Left padding on actionbar is affected by the Navigating Up behavior of actionbar icon. When that is disabled (via ActionBar.setDisplayHomeAsUpEnabled(false)) the left/up indicator is gone, but a left padding is used as well. A simple solution:

1. 使用使动作条向上导航 ActionBar.setDisplayHomeAsUpEnabled（真），以便考虑在布局过程中，指标视图
2. 在强制用作在你的 RES /值-V14 / styles.xml 到空 <指标绘制/ LI>

1. enable the actionbar up navigation using ActionBar.setDisplayHomeAsUpEnabled(true) in order to consider the indicator view in the layout process
2. force the drawable used as up indicator in your res/values-v14/styles.xml to null

例如：

<style name="AppBaseTheme" parent="android:Theme.Holo.Light.DarkActionBar">
    <!-- API 14 theme customizations can go here. -->
    <item name="android:homeAsUpIndicator">@null</item>
</style>

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