透明 AlertDialog 有黑色背景 [英] Transparent AlertDialog has black background

问题描述

我有一个自定义的 AlertDialog 样式，使 AlertDialog 框透明.它工作正常，只是当我将所需的透明布局膨胀到警报对话框窗口中时，它显示为黑色背景.我的目标是有一个完全透明的 AlertDialog ，看起来好像只有 4 个按钮浮动而不是框架.图一是自定义对话框给我的，图二是我想要的或我的目标.

I have a custom AlertDialog style that makes the AlertDialog box transparent. It works fine except that when I inflate my desired transparent layout into the alert dialog window, it shows up with a black background. My goal is to have a completely transparent AlertDialog to where it seems as if there are only 4 buttons floating rather than a frame. Image one is what the custom dialog is giving me, image two is my desired or what I am aiming for.

这里是自定义Dialog

<style name="CustomDialog" parent="android:Theme.Dialog">
    <item name="android:windowFrame">@null</item>
    <item name="android:windowBackground">@android:color/transparent</item>
    <item name="android:windowIsFloating">true</item>
    <item name="android:windowContentOverlay">@null</item>
    <item name="android:windowTitleStyle">@null</item>
    <item name="android:windowAnimationStyle">@android:style/Animation.Dialog</item>
    <item name="android:windowSoftInputMode">stateUnspecified|adjustPan</item>
    <item name="android:backgroundDimEnabled">false</item>
    <item name="android:background">@android:color/transparent</item>
</style>

这是我在 onCreate()

AlertDialog.Builder imageDialog = new AlertDialog.Builder(TimeLine.this, R.style.CustomDialog);
inflater = getLayoutInflater();
View view=inflater.inflate(R.layout.tabs, null);
AlertDialog a = imageDialog.create();
a.getWindow().setBackgroundDrawable(new ColorDrawable(android.graphics.Color.TRANSPARENT));
a.setView(view, 0, 0, 0, 0);

a.show();

编辑*标签布局xml的代码在这里`

<RelativeLayout
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:id="@+id/tabLayout"
    android:background="#000000ff">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button"
        android:id="@+id/button2"
        android:layout_marginTop="206dp"
        android:layout_below="@+id/button4"
        android:layout_alignStart="@+id/button4" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button"
        android:id="@+id/button3"
        android:layout_alignTop="@+id/button2"
        android:layout_alignParentStart="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button"
        android:id="@+id/button4"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true"
        android:layout_marginTop="100dp" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button"
        android:id="@+id/button"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="100dp" />
</RelativeLayout>

`

通过测试查看问题的根源，我发现布局是透明的，因为当我更改布局的背景颜色时，警报对话框也会更改.但是当布局设置为透明时，看起来膨胀的布局后面是黑色的.正因为如此，我不确定该怎么做，或者是 AlertDialog 设置还是我的布局代码.

From testing to see what the source of the problem is, I have found out that it is true that the layout is transparent because when I change the background color of the layout, so does the alert dialog change. However when the layout is set to transparent, it seems that what is behind the inflated layout is black. And because of that I am unsure of what to do or whether it is the AlertDialog settings or my layout code.

推荐答案

问题是 AlertDialog builder 实际上并不适合设计透明对话框，并且会并且总是有这个黑色背景，这实际上是一个为它设置主题，而是使用 Dialog 来创建一个透明的主题.

The problem is that AlertDialog builder is actually not good for designing transparent dialog and will and always have this black background which is actually a Theme for it, instead use the Dialog to create a transparent theme instead.

示例:

Dialog alertDialog = new Dialog(this);
alertDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
alertDialog.setContentView(R.layout.tabs);
alertDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
alertDialog.show();

使用Dialog不需要对透明背景进行任何主题操作，所以基本上很容易.

Using Dialog does not require any theme manipulation for transparent background so it is basically easy.

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