转载请注明出处：http://blog.csdn.net/u012975705/article/details/49275001
之前遇到一问题，就是当使用ScrollView时，ScrollView控件里的布局无法充满整个手机屏幕，通过阅读源码发现，ScrollView中有个mFillViewport属性： 
When set to true, the scroll view measure its child to make it fill the currently visible area.大概意思就是当mFillViewport设置为true的时候，其子视图能够自动填充满当前可见的整个区域。即，在xml布局文件中为ScrollView控件添加
android:fillViewport="true"能使ScrollView里的元素填满整个ScrollView。
实例：
<?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:background="@color/white"
android:gravity="center"
android:orientation="vertical">
<ScrollView
android:fillViewport="true"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:gravity="center"
android:orientation="vertical">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_logo2" />
<TextView
style="@style/TextTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="7dp"
android:text="手机耕犊" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/activity_vertical_margin"
android:orientation="vertical">
<LinearLayout
android:focusable="true"
android:focusableInTouchMode="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="@dimen/activity_horizontal_margin"
android:layout_marginRight="@dimen/activity_horizontal_margin"
android:layout_marginTop="@dimen/activity_vertical_margin"
android:orientation="horizontal">
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:paddingLeft="20dp"
android:src="@drawable/ic_phone" />
<EditText
android:id="@+id/login_telnum"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@null"
android:hint="@string/pc_telnum"
android:paddingLeft="15dp"
android:singleLine="true"
android:textColor="@color/text_title"
android:textColorHint="@color/gray"
android:textCursorDrawable="@null"
android:textSize="@dimen/typeface_medium_16" />
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginBottom="30dp"
android:layout_marginLeft="30dp"
android:layout_marginTop="5dp"
android:background="@color/bg_custom_gray" />
<LinearLayout
android:focusable="true"
android:focusableInTouchMode="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="@dimen/activity_horizontal_margin"
android:layout_marginRight="@dimen/activity_horizontal_margin"
android:orientation="horizontal">
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:paddingLeft="20dp"
android:src="@drawable/ic_lock" />
<EditText
android:id="@+id/login_password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@null"
android:hint="@string/pc_password"
android:paddingLeft="15dp"
android:password="true"
android:singleLine="true"
android:textColor="@color/text_title"
android:textColorHint="@color/gray"
android:textCursorDrawable="@null"
android:textSize="@dimen/typeface_medium_16" />
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginBottom="10dp"
android:layout_marginLeft="30dp"
android:layout_marginTop="5dp"
android:background="@color/bg_custom_gray" />
<TextView
android:id="@+id/pc_forget_pwd"
style="@style/TextLittle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:text="@string/pc_forget_password"
android:textColor="#20ac42"
android:textSize="12dp" />
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:orientation="vertical"
android:paddingLeft="30dp"
android:paddingRight="30dp">
<Button
android:id="@+id/pc_login"
android:layout_width="match_parent"
android:layout_height="@dimen/common_button_height"
android:background="@drawable/bg_bt_rectangle_green2"
android:text="@string/pc_login"
android:textColor="@color/white"
android:textSize="@dimen/typeface_medium_16" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="bottom">
<TextView
android:id="@+id/pc_register"
android:layout_width="match_parent"
android:layout_height="@dimen/common_button_height"
android:background="@color/bg_custom_gray"
android:gravity="center"
android:text="@string/pc_register"
android:textColor="@color/gray"
android:textSize="@dimen/typeface_small_14" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</ScrollView>
</LinearLayout>