Android布局

Question

How could i achive next one after another layouts position (with height)?

Current code:

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <ListView
            android:layout_width="match_parent"
            android:layout_height="match_parent"></ListView>
    </RelativeLayout>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true">

        <Button
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textAlignment="center"
            android:text="Новая заметка"/>
    </RelativeLayout>
</RelativeLayout>

Answer 1

You can achieve the same layout when you will add "layout_above" property use this code.

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<RelativeLayout
    android:layout_above="@+id/relativeBottom"
    android:layout_width="match_parent"
    android:layout_alignParentTop="true"
    android:layout_height="match_parent">

    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"></ListView>
</RelativeLayout>

<RelativeLayout
    android:id="@+id/relativeBottom"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAlignment="center"
        android:text="Новая заметка"/>
    </RelativeLayout>
</RelativeLayout>

Answer 2

I would suggest this

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/myButton">

    </ListView>

    <Button
        android:id="@+id/myButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="22dp"
        android:text="New Note"
        android:layout_marginBottom="5dp"
        android:layout_alignParentBottom="true" />

</RelativeLayout>

Because I don't see the reason to put relative layout insid another relative layout.

Answer 3

In my understanding of what is needed, there's little need for relative layout at all. It can be achieved with just LinearLayout , which is less expensive.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView 
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"/>

    <Button
        android:id="@+id/myButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="22dp"
        android:text="New Note"
        android:layout_marginBottom="5dp"
        />
</LinearLayout>