我想实现下面这种效果,也就是上下左右四个箭头:代码如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/arrowlayout"
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center|top">
<Button
android:id="@+id/up"
android:background="@drawable/up"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:layout_weight="1">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="vertical"
android:gravity="center|left">
<Button
android:id="@+id/left"
android:background="@drawable/left"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="vertical"
android:gravity="center|right">
<Button
android:id="@+id/right"
android:background="@drawable/right"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center">
<Button
android:id="@+id/down"
android:background="@drawable/down"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center" />
</LinearLayout>
</LinearLayout>在第25行提示我错误
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/arrowlayout"
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center|top">
<Button
android:id="@+id/up"
android:background="@drawable/up"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:layout_weight="1">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="vertical"
android:gravity="center|left">
<Button
android:id="@+id/left"
android:background="@drawable/left"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="vertical"
android:gravity="center|right">
<Button
android:id="@+id/right"
android:background="@drawable/right"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:gravity="center">
<Button
android:id="@+id/down"
android:background="@drawable/down"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center" />
</LinearLayout>
</LinearLayout>在第25行提示我错误
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="vertical"
android:gravity="center|left">这里每行android前面存在着不可见的、类似于空格的非法字符,删除掉就好了:
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="vertical"
android:gravity="center|left">