Custom RelativeLayout match_parent中的自定义按钮不起作用

Question

我有一个自定义RelativeLayout，可以调整大小到所需的比例。我已经覆盖了看起来像这个

的onMeasure方法

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    float height = getMeasuredHeight();
    float mWidth = height / 711.0f * 320.0f;
    setMeasuredDimension((int) mWidth, (int)height );

}

这就像我希望它调整视图宽度一样。

我有一个我已经扩展的按钮，以便我可以根据其宽度调整其高度。我用以下代码覆盖了这个自定义类的onMeasure方法。

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    float width = getMeasuredWidth();
    float mheight = (width / 320.0f) * 60.0f;  
    Log.i(TAG, "measures width is "+width + " measured height is "+mheight);
    setMeasuredDimension((int) width, (int) mheight);

}

我有一个xml文件，如下所示

<?xml version="1.0" encoding="utf-8"?>
<com.breadcreative.Presenter.Core.SlidingRelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:background="@color/pdarkgrey"
    android:orientation="vertical"
    android:visibility="visible"
    android:minWidth="328dp">

    <com.breadcreative.Presenter.Core.SquareImageView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:id="@+id/imageView"
        android:src="@drawable/sidebar_logo"
        android:maxWidth="300dp" />

    <TextView
        android:id="@+id/PresentationView"
        android:layout_width="wrap_content"
        android:layout_height="30dp"
        android:text="PRESENTATION"
        android:autoText="false"
        android:textColor="#ffffff"
        android:gravity="center_vertical"
        android:paddingLeft="32dp"
        android:textSize="15sp"
        android:layout_below="@+id/imageView" />

    <com.breadcreative.Presenter.Core.SlidingMenuButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Library"
        android:id="@+id/pLibButton"
        android:background="@drawable/sidebar_plib"
        android:textSize="17dp"
        android:textColor="@color/white"
        android:gravity="center_vertical|left"
        android:clickable="true"
        android:onClick="hidePanel"
        android:layout_below="@+id/PresentationView"
        android:paddingLeft="80dp" />

    <com.breadcreative.Presenter.Core.SlidingMenuButton
        android:layout_width="wrap_content"
        android:layout_height="60dp"
        android:text="User"
        android:id="@+id/pUser"
        android:textColor="@color/white"
        android:textSize="17dp"
        android:background="@drawable/sidebar_puser"
        android:gravity="center_vertical|left"
        android:layout_below="@+id/pLibButton"
        android:paddingLeft="80dp" />

    <com.breadcreative.Presenter.Core.SlidingMenuButton
        android:layout_width="wrap_content"
        android:layout_height="60dp"
        android:text="Shared"
        android:id="@+id/pShared"
        android:textColor="@color/white"
        android:textSize="17dp"
        android:background="@drawable/sidebar_pshared"
        android:paddingLeft="80dp"
        android:gravity="center_vertical|left"
        android:layout_below="@+id/pUser" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="30dp"
        android:text="DOCUMENTS"
        android:id="@+id/textView"
        android:textColor="@color/white"
        android:gravity="center_vertical"
        android:textSize="15sp"
        android:paddingLeft="32dp"
        android:layout_below="@+id/pShared"
        android:layout_marginTop="5dp" />

    <com.breadcreative.Presenter.Core.SlidingMenuButton
        android:layout_width="wrap_content"
        android:layout_height="60dp"
        android:text="Library"
        android:id="@+id/dLibraryBtn"
        android:textSize="17dp"
        android:textColor="@color/white"
        android:background="@drawable/sidebar_dlib"
        android:gravity="center_vertical|left"
        android:paddingLeft="80dp"
        android:layout_below="@+id/textView" />


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="30dp"
        android:text="MESSAGES"
        android:id="@+id/textView2"
        android:paddingLeft="32dp"
        android:gravity="center_vertical"
        android:textSize="15sp"
        android:textColor="@color/white"
        android:layout_below="@+id/dLibraryBtn"
        android:layout_marginTop="5dp" />

    <com.breadcreative.Presenter.Core.SlidingMenuButton
        android:layout_width="wrap_content"
        android:layout_height="60dp"
        android:text="Inbox"
        android:id="@+id/messages_btn"
        android:textSize="17dp"
        android:textColor="@color/white"
        android:gravity="center_vertical|left"
        android:background="@drawable/sidebar_messages"
        android:paddingLeft="80dp"
        android:layout_below="@+id/textView2" />

我的问题是，如果我设置了

 android:layout_width="wrap_content"

自定义按钮太小，但如果我将其设置为

 android:layout_width="match_parent"

按钮宽度与设备屏幕相同，而不是我想要的自定义RelativeLayout。我错过了什么？