Android 布局权重不适用于相对布局

Question

我是第一次尝试实现布局权重，我尝试过使用线性布局效果很好，但是当我尝试使用相对和线性布局时出现了问题。这里有什么问题？

我的 XML 文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/Linearlayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:weightSum="100" >

<RelativeLayout
    android:id="@+id/Rlayout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_weight="45" >

    <Gallery
        android:id="@+id/Gallery01"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:spacing="4dip" >
    </Gallery>
</RelativeLayout>

<RelativeLayout
    android:id="@+id/Rlayout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_weight="10"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/ImageView01"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:scaleType="fitXY" />

    <ImageView
        android:id="@+id/ImageView02"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:scaleType="fitXY" />
</RelativeLayout>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/navbar"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_weight="45"
    android:background="@drawable/button1"
    android:orientation="horizontal"
    android:weightSum="100" >

    <Button
        android:id="@+id/makerback"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_gravity="center"
        android:layout_weight="20"
        android:background="@drawable/makerback" />

    <Button
        android:id="@+id/makerphoto"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_gravity="center"
        android:layout_weight="20"
        android:background="@drawable/makerphoto" />

    <Button
        android:id="@+id/makerselves"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_gravity="center"
        android:layout_weight="20"
        android:background="@drawable/makerselves" />

    <Button
        android:id="@+id/makerskins"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_gravity="center"
        android:layout_weight="20"
        android:background="@drawable/makerskins" />

    <Button
        android:id="@+id/makersave"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_gravity="center"
        android:layout_weight="20"
        android:background="@drawable/makersave" />
</LinearLayout>

</LinearLayout>

我需要实现上图:

Answer 1

You cannot use percentages to define the dimensions of a View inside a RelativeLayout. The best ways to do it is to use LinearLayout and weights, or a custom Layout. -Romain Guy

Percentage width in a RelativeLayout

来自文档:http://developer.android.com/reference/android/widget/LinearLayout.LayoutParams.html#weight

更新

我们现在可以使用 PercentRelativeLayout .来自文档的示例:

<android.support.percent.PercentRelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        app:layout_widthPercent="50%"
        app:layout_heightPercent="50%"
        app:layout_marginTopPercent="25%"
        app:layout_marginLeftPercent="25%" />

</android.support.percent.PercentFrameLayout>