Question

工具栏重叠线性布局的GridView，因此第一行中超过80％的内容被其上方的工具栏隐藏。

我在FloatingActionButton中添加了activity_main后发生了这种情况。我试图在LinearLayout中包含工具栏，但它给了我一个强制转换异常。如果可以在LinearLayout中包含工具栏，我很好。另外，我尝试使用marginTop或paddingTop静态处理它。

以下是它现在的样子：Screenshot

以下是xml文件：

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context="edu.ahduni.seas.gyapak.MainActivity">

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/AppTheme.PopupOverlay" />

</android.support.design.widget.AppBarLayout>

<include layout="@layout/content_main" />

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    android:layout_margin="@dimen/fab_margin"
    android:src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>

content_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="@+id/textlayout"
tools:context="edu.ahduni.seas.gyapak.MainActivity">

    <GridView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/grid"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:columnWidth="90dp"
        android:numColumns="auto_fit"
        android:verticalSpacing="10dp"
        android:horizontalSpacing="10dp"
        android:stretchMode="columnWidth"
        android:gravity="center"
        android:padding="10dp" />
</LinearLayout>

解

显然，有很多解决方案：（信用转到答案和评论讨论）

1。在android:layout_marginTop="?attr/actionBarSize"的LinearLayout中包含android:paddingTop="AnydpThatYouFurtherWantToAdjust" content_main.xml来自：@VladimirJovanović

2。包括app:layout_behavior="@string/appbar_scrolling_view_behavior" android:paddingTop="AnydpThatYouFurtherWantToAdjust"的LinearLayout中的content_main.xml来自：@Burhanuddin Rashid

3。这是一个很长的问题，请查看@ AbhayBohra的答案，然后将android:paddingTop="AnydpThatYouFurtherWantToAdjust"包含在content_main.xml Credit的LinearLayout中：@Abhay Bohra和@Rahul Sharma

Answer 1

尝试在具有垂直方向的LinearLayout中添加appBarLayout和include语句

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="edu.ahduni.seas.gyapak.MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <android.support.design.widget.AppBarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:theme="@style/AppTheme.AppBarOverlay">

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                app:popupTheme="@style/AppTheme.PopupOverlay" />

        </android.support.design.widget.AppBarLayout>

        <include layout="@layout/content_main" />
    </LinearLayout>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        android:src="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>

Answer 2

将Connection conn; Statement st; ResultSet rs; public void Connect() throws SQLException { conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/bookcase", "root", "1234"); if(conn.isValid(10)) { System.out.println("Connection reached"); } else { System.out.println("Something went wrong!"); } }添加到您的content_main <!channel>，如下所示：

app:layout_behavior

Answer 3

尝试将tools:showIn="@layout/activity_main"添加到content_main.xml LinearLayout。最终代码应如下所示：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:id="@+id/textlayout"
    tools:showIn="@layout/activity_main"
    tools:context="edu.ahduni.seas.gyapak.MainActivity">

工具栏与LinearLayout的GridView重叠

3 个答案: