I can't move a button inside a frame layout

问题:

I have tried to move the button using graphical interface and android:layout_alignParentLeft in XML file, anyway it does not work. My Android Studio version is 2.2.3. Have you ever had this problem?

回答1:

You need RelativeLayout or other simlilar layout as parent container because FrameLayout just draw the views one over another plus you should check the properties section to see the attibute properties that you can apply on your layout.

To read further about ViewGroups and it's sub-types with their behaviours

回答2:

If you forced to use FrameLayout(e.g in Toolbar or so) and you have only one element(or small amount) to operate with(button) you can use android:layout_gravity="" attribute to align element in the FrameLayout.

   <FrameLayout
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:text="@string/app_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"/>
    </FrameLayout>

If you have have few elements in your layout, you can: 1) Change FrameLayout to RelativeLayout or 2)Wrap all items into Relative layout and set parameters to match_parent

    <FrameLayout
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorPrimary">

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

        <TextView
            android:text="@string/app_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"/>
    </RelativeLayout>
    </FrameLayout>