Layout Alignment Issue in android 5.0

问题

I have a layout in which a button is aligned at the bottom of the RelativeLayout as in below code :

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="250dp"
    android:background="@color/background_material_light"
    android:layout_height="match_parent">

<View
    android:layout_alignParentLeft="true"
    android:layout_width="1dp"
    android:layout_height="match_parent"
    android:background="@color/strokeColor"/>

<RelativeLayout
    android:id="@+id/rlHeaderFilter"
    android:layout_width="match_parent"
    android:layout_height="@dimen/abc_action_bar_default_height_material">

    <View
        android:id="@+id/separator"
        android:layout_width="1dp"
        android:layout_height="match_parent"
        android:background="@color/strokeColor"/>

    <TextView
        android:background="@color/actionbar_background"
        android:id="@+id/tvFilterText"
        style="@style/textStyleHeading2"
        android:layout_toRightOf="@+id/separator"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerHorizontal="true"
        android:gravity="center"
        android:textColor="@color/white"
        android:text="Filter Search" />

    <ImageView
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_alignParentRight="true"
        android:src="@drawable/refresh"
        android:id="@+id/resetLeadsFilter"
        android:contentDescription="@string/emptyString"
        android:layout_centerVertical="true"
        android:padding="6dp"/>

</RelativeLayout>

<TextView
    android:layout_below="@+id/rlHeaderFilter"
    android:layout_marginTop="10dp"
    android:id="@+id/tvBudgetFromFilter"
    style="@style/textSpinnerStyleHeading"
    android:layout_margin="8dp"
    android:hint="Budget From"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

<TextView
    android:layout_below="@+id/tvBudgetFromFilter"
    android:layout_marginTop="10dp"
    android:id="@+id/tvBudgetToFilter"
    style="@style/textSpinnerStyleHeading"
    android:layout_margin="8dp"
    android:hint="Budget To"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

<include
    android:layout_marginTop="20dp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="8dp"
    android:layout_below="@+id/tvBudgetToFilter"
    android:id="@+id/sourceLayout"
    layout="@layout/source_layout" />

<include
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/statusLayout"
    android:layout_margin="8dp"
    android:layout_below="@+id/sourceLayout"
    layout="@layout/status_layout" />

<Button
    android:layout_alignParentBottom="true"
    android:layout_gravity="bottom"
    android:layout_marginTop="10dp"
    android:textColor="@color/white"
    android:background="@color/actionbar_background"
    android:text="SEARCH"
    android:id="@+id/bFilterLeads"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
</RelativeLayout>

I can see the button at the bottom of the layout as shown in the screenshot .It displays like this in pre Lollipop devices(below < 5.0 devices) :

But in Lollipop the button at the bottom does not appear as shown in following screenshot :

I am not able to get the reason for that Please help me out . Thanks in advance .

回答1:

I have solved my problem ! In fact, the LinearLayout was behind the navigationBar. To fix it, just add this line to the Activity (after setContentView();)

getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION);

回答2:

I'm not sure why the layout behaves differently between Lollipop/pre-Lollipop (unless there's some other piece that's not shown). I will point out though that I don't think layoutGravity is valid for views within a RelativeLayout -- that's something you'd use with a LinearLayout. I'd first remove that property and see how it behaves on pre-Lollipop, and then see about correcting the layout once that's done. It could be that layoutGravity is causing some sort of incorrect behavior pre-Lollipop.

来源：https://stackoverflow.com/questions/28678555/layout-alignment-issue-in-android-5-0