Android scrollview hiding top content in layout

问题

Im having a problem where the android scrollview starts hiding a pair of textviews I have at the top of my layout, I have found another person on this very site who had that problem and was able to get help unfortunately the person who helped them didnt actually say what fixes it, can anyone tell me what was the fix here?

android scrollview hiding top content

any help would be huge here is my xml code:

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@color/title_color_dark_transparent" >

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center_vertical|center_horizontal|center"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_gravity="center"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginTop="5dp"
        android:orientation="vertical"
        android:paddingTop="5dp" >

        <TextView
            android:id="@+id/saysomething"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/loading"
            android:textColor="#FFFFFF"
            android:textSize="30dp" />

        <TextView
            android:id="@+id/saysomethinginfo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="5dp"
            android:text="@string/loading"
            android:textColor="#FFFFFF"
            android:textSize="17dp" />

        <EditText
            android:id="@+id/tweetedittext"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/edit_text"
            android:gravity="top"
            android:hint="@string/edittext_hint"
            android:inputType="textCapSentences|textMultiLine|textAutoCorrect|textAutoComplete"
            android:lines="3"
            android:textAppearance="@style/TextAppearance.EditText"
            android:textSize="17dp" />

        <RelativeLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="5dp"
            android:layout_marginTop="5dp"
            android:orientation="horizontal" >

            <Button
                android:id="@+id/photobutton"
                style="@style/TextAppearance.Button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/button_background"
                android:onClick="photobuttonClicked"
                android:text="@string/photobuttontext"
                android:textSize="15dp" />

            <TextView
                android:id="@+id/charactersremaining"
                android:layout_width="wrap_content"
                android:layout_height="fill_parent"
                android:layout_centerInParent="true"
                android:layout_toLeftOf="@+id/posttweetbutton"
                android:text="@string/characters"
                android:textColor="#FFFFFF"
                android:textSize="20dp" />

            <Button
                android:id="@id/posttweetbutton"
                style="@style/TextAppearance.Button"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:layout_marginLeft="2dp"
                android:background="@drawable/button_background"
                android:onClick="posttweetbuttonClicked"
                android:text="@string/postbuttonstext"
                android:textSize="15dp" />
        </RelativeLayout>
    </LinearLayout>

    <TextView
        android:id="@+id/photodetails"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=""
        android:textColor="#FFFFFF"
        android:textSize="17dp"
        android:layout_marginTop="8dp"
        android:layout_marginLeft="8dp" />

    <ImageView
        android:id="@+id/iv_pic"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginRight="8dp" />
</LinearLayout>

</ScrollView>

回答1:

Found it ! It's the android:layout_gravity="center" in the LinearLayout that is the culprit. Just delete this and everything should be fine.

回答2:

Have you tried setting

android:fillViewport="true"

in the ScrollView?

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:fillViewport="true"
  android:background="@color/title_color_dark_transparent" >

回答3:

You can scroll programmatically.

1. Remove android:layout_gravity property from xml
2. Add scrolling to onResume function

Some code from my project:

protected void onResume() {
    super.onResume();
    final HorizontalScrollView svInMenu = (HorizontalScrollView) findViewById(R.id.svInMenu);
    ViewTreeObserver vto = svInMenu.getViewTreeObserver();
    vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
        public void onGlobalLayout() {
            svInMenu.scrollTo(svInMenu.getRight() / 4, 0);
        }
    });
}

回答4:

Your outer LinearLayout has its height set to match_parent. It should be wrap_content instead. The inner LinearLayout should also have height wrap_content.

回答5:

Add android:layout_weight="1" to your scrollview. It will resolve the problem. Something like this

 <ScrollView
        android:id="@+id/scroll"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:layout_weight="1" >

来源：https://stackoverflow.com/questions/9916317/android-scrollview-hiding-top-content-in-layout