Android 如何将背景图片添加到活动中？
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how to add background image to activity?
提问by Vladimir Berezkin
using theme or ImageView ?
使用主题或 ImageView ？
回答by Sephy
use the android:backgroundattribute in your xml. Easiest way if you want to apply it to a whole activity is to put it in the root of your layout. So if you have a RelativeLayout as the start of your xml, put it in here:
android:background在您的 xml 中使用该属性。如果要将其应用于整个活动，最简单的方法是将其放在布局的根目录中。所以如果你有一个RelativeLayout作为你的xml的开始，把它放在这里：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/rootRL"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/background">
</RelativeLayout>
回答by Paresh Mayani
You can set the "background image" to an activity by setting android:backgroundxml attributes as followings:
您可以通过设置android:backgroundxml 属性为活动设置“背景图像”，如下所示：
(Here, for example, Take a LinearLayout for an activity and setting a background image for the layout(i.e. indirectly to an activity))
（这里，例如，为一个活动采取一个 LinearLayout 并为该布局设置一个背景图像（即间接到一个活动））
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/LinearLayout01"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:background="@drawable/icon">
</LinearLayout>
回答by Jesvin
Place the Image in the folder drawable. drawable folder is in res. drawable have 5 variants drawable-hdpi drawable-ldpi drawable-mdpi drawable-xhdpi drawable-xxhdpi
将图像放在 drawable 文件夹中。drawable 文件夹在 res. drawable 有 5 个变体 drawable-hdpi drawable-ldpi drawable-mdpi drawable-xhdpi drawable-xxhdpi
回答by Jorgesys
Nowadays we have to use match_parent:
现在我们必须使用match_parent：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@drawable/background">
</RelativeLayout>
回答by Sunil Kumar
We can easily place the background image in PercentFrameLayout using the ImageView. We have to set the scaleType attribute value="fitXY" and in the foreground we can also display other view's like textview or button.
我们可以使用 ImageView 轻松地将背景图像放置在 PercentFrameLayout 中。我们必须设置 scaleType 属性 value="fitXY" 并且在前台我们还可以显示其他视图，如文本视图或按钮。
<android.support.percent.PercentFrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
>
<ImageView
android:src="@drawable/logo"
android:id="@+id/im1"
android:scaleType="fitXY"
android:layout_height="match_parent"
android:layout_width="match_parent"/>
<EditText android:layout_gravity="center_horizontal"
android:hint="Enter Username"
android:id="@+id/et1"
android:layout_height="wrap_content"
app:layout_widthPercent="50%"
app:layout_marginTopPercent="30%"
/>
<Button
android:layout_gravity="center_horizontal"
android:text="Login"
android:id="@+id/b1"
android:layout_height="wrap_content"
app:layout_widthPercent="50%"
app:layout_marginTopPercent="40%"/>
</android.support.percent.PercentFrameLayout>
回答by Sebastian Walla
and dont forget to clean your project after writing these lines you`ll a get an error in your xml file until you′ve cleaned your project in eclipse: Project->Clean...
并且不要忘记在编写这些行之后清理你的项目，你会在你的 xml 文件中得到一个错误，直到你在 eclipse 中清理了你的项目：Project->Clean...
