Android的覆盖视图ontop的一切？ [英] Android overlay a view ontop of everything?

问题描述

您可以覆盖一切的顶视图中的Andr​​oid？

Can you overlay a view on top of everything in android?

在iPhone我会得到新的视图设置其 frame.origin 来（0,0），其宽度和高度<$ C $的宽度和高度C> self.view 。将它添加到 self.view 然后将导致它作为一个覆盖，覆盖后面的内容（或者，如果它有一个透明的背景则显示视图后面）。

In iPhone I would get the new view set its frame.origin to (0,0) and its width and height to the width and height of self.view. Adding it to self.view would then cause it to act as an overlay, covering the content behind (or if it had a transparent background then showing the view behind).

有没有在Android的类似的技术？我认识到的意见略有不同（有三种类型（或更多...）RelativeLayout的，LinearLayout中和的FrameLayout），但有什么办法，只是覆盖在一切之上的观点胡乱？

Is there a similar technique in android? I realise that the views are slightly different (there are three types (or more...) relativelayout, linearlayout and framelayout) but is there any way to just overlay a view on top of everything indiscriminately?

感谢你。

推荐答案

只需使用 RelativeLayout的或的FrameLayout 。最后一个子视图将覆盖一切。

Simply use RelativeLayout or FrameLayout. The last child view will overlay everything else.

Android支持的模式而可可触摸SDK不：布局管理
布局的为iPhone意味着一切的位置绝对（除了一些STRECH因素）。布局安卓意味着孩子将被放置在关系到海誓山盟。

Android supports a pattern which Cocoa Touch SDK doesn't: Layout management.
Layout for iPhone means to position everything absolute (besides some strech factors). Layout in android means that children will be placed in relation to eachother.

例（第二的EditText将完全覆盖第一个）：

Example (second EditText will completely cover the first one):

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/root_view">

    <EditText
        android:layout_width="fill_parent"
        android:id="@+id/editText1"
        android:layout_height="fill_parent">
    </EditText>

    <EditText
        android:layout_width="fill_parent"
        android:id="@+id/editText2"
        android:layout_height="fill_parent">
        <requestFocus></requestFocus>
    </EditText>

</FrameLayout>

的FrameLayout 是某种观点栈。用于制造特殊情况。

FrameLayout is some kind of view stack. Made for special cases.

RelativeLayout的是pretty的强大。你可以这样定义的规则视图A有对齐父布局底部的查看B必须对准底部到顶部的等

RelativeLayout is pretty powerful. You can define rules like View A has to align parent layout bottom, View B has to align A bottom to top, etc

基于注释更新

通常设置在的onCreate 与的setContentView（R.layout.your_layout）的内容（它会膨胀布局你）。您为cn做手工，并调用的setContentView（inflatedView），有没有什么区别。

Usually you set the content with setContentView(R.layout.your_layout) in onCreate (it will inflate the layout for you). You cn do that manually and call setContentView(inflatedView), there's no difference.

视图本身可能是单一视图（如的TextView ）或复杂的布局层次结构（嵌套布局，因为所有的布局意见自理）。

The view itself might be single view (like TextView) or a complex layout hierarchy (nested layouts, since all layouts are views themself).

调用后的setContentView 的活动知道其内容的样子，你可以使用（的FrameLayout）findViewById（R.id.root_view）检索任何观点int此层次结构（一般模式（ClassOfTheViewWithThisId）findViewById（R.id.declared_id_of_view））。

After calling setContentView your activity knows what its content looks like and you can use (FrameLayout) findViewById(R.id.root_view) to retrieve any view int this hierarchy (General pattern (ClassOfTheViewWithThisId) findViewById(R.id.declared_id_of_view)).

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