在android中的另一个视图上方放置/重叠(z-index)一个视图 [英] Placing/Overlapping(z-index) a view above another view in android
问题描述
我有一个由 imageview 和 textview 组成的线性布局,在线性布局中一个在另一个之下.
I have a linear layout which consists of imageview and textview , one below another in a linear layout.
<LinearLayout android:orientation="horizontal" ... >
<ImageView
android:id="@+id/thumbnail"
android:layout_weight="0.8"
android:layout_width="0dip"
android:layout_height="fill_parent">
</ImageView>
<TextView
android:id="@+id/description"
android:layout_weight="0.2"
android:layout_width="0dip"
android:layout_height="wrap_content">
</TextView>
可能缺少一些规则,这是为了提供一个想法,布局的外观.我想要另一个长度和宽度为 50dip 的小文本视图,放在 imageview 上,over"我的意思是 z-index 比 imageview 多,我想把它放在 imageview 的中心和上方(重叠).
Some rules might be missing , this is to give an idea , how layout looks. I want another small text view of say 50dip in length and width , placed over the imageview, by "over" I meant z-index more than imageview , I want to place this , in the center and above(overlapping) the imageview.
我想知道如何使用不同的 z-index(最好是线性布局)将一个视图置于另一个视图之上?
I want to know how can we place one view above the other, with varying z-index (preferably in linear layout) ?
推荐答案
你不能为此使用 LinearLayout,但你可以使用 FrameLayout
.在 FrameLayout
中,z-index 由添加项的顺序定义,例如:
You can't use a LinearLayout for this, but you can use a FrameLayout
. In a FrameLayout
, the z-index is defined by the order in which the items are added, for example:
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/my_drawable"
android:scaleType="fitCenter"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center"
android:padding="5dp"
android:text="My Label"
/>
</FrameLayout>
在这种情况下,TextView 将被绘制在 ImageView 的顶部,沿着图像的底部中心.
In this instance, the TextView would be drawn on top of the ImageView, along the bottom center of the image.
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