Android：scrollview中的线性布局未显示

Question

There are some linear layout inside scrollview as well. when i install the app on HUAWEI Mate7 it works just fine. but on Samsung S3 or LG G3 the only thing that shows is background image but when i touch the screen, methods are working. only views are not showing. here is mainActivity.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/back1"
    android:alpha=".9">

    <ScrollView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/scrollView"
        android:fillViewport="true"
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        >

        <LinearLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:alpha=".9"
            android:gravity="center">
        </LinearLayout>
    </ScrollView>

</RelativeLayout>

inside the linear layout there are 20 of this

 <LinearLayout
     android:orientation="horizontal"
     android:layout_width="match_parent"
     android:layout_height="100dp"
     android:layout_marginBottom="5dp"
     android:layout_marginTop="5dp" >

     <ImageButton
         android:layout_width="0dp"
         android:layout_height="fill_parent"
         android:id="@+id/imageButton7"
         android:src="@drawable/can_pot_com"
         android:scaleType="fitStart"
         android:background="#00ffffff"
         android:cropToPadding="false"
         android:foregroundGravity="bottom"
         android:layout_weight="2" />

    <Button
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="@string/can_pot"
        android:id="@+id/button6"
        android:textStyle="bold"
        android:textIsSelectable="false"
        android:lines="3"
        android:linksClickable="false"
        android:textColor="#000000"
        android:background="#00ffffff"
        android:layout_weight="3" />
</LinearLayout>

I don't know what do to!

Answer 1

The problem is related probably with the align and gravity of the layouts; in the LinearLayout child inside the ScrollView, change the android:gravity="center by: android:gravity="top|center" . Hope it helps.

(And and although it does not give you an error, you can remove the second xmlns:android="http://schemas.android.com/apk/res/android")

Answer 2

I had a similar problem. The LinearLayout inside my ScrollView was not working as expected. The first component of the lineaLayout was not visible. The reason was android:layout_gravity="center_vertical". Change that to android:layout_gravity="top|center_vertical".

Answer 3

从滚动视图中删除此行

  xmlns:android="http://schemas.android.com/apk/res/android"

Answer 4

try this code

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/back1"
android:alpha=".9"> <ScrollView
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:id="@+id/scrollView"
    android:fillViewport="true"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    >

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:alpha=".9"
        android:gravity="center">
    </LinearLayout>
</ScrollView>