android - 前景在实际设备中不可见，但在模拟器中可见(Foreground not visible in real device but visible in emulator)

Question

When I'm setting a foreground for a button it show's fine on Android Studio but when I try it on my phone I cant see the picture selected.

(当我为按钮设置前景时，它在Android Studio上显示正常，但是当我在手机上尝试时，看不到所选图片。)

Here is a fresh project just to test this:

(这是一个新项目，仅用于测试：)

Something wrong with Android Studio's preferences or its just my phone?

(Android Studio的偏好设置或我的手机有问题吗？)

<TextView
    android:layout_width="wrap_content"
    android:layout_height="100dp"
    android:text="Hello World!"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:foreground="@mipmap/ic_launcher"
    android:foregroundGravity="center" />

And here is the Hello World's simple code.

(这是Hello World的简单代码。)

  ask by C.S. translate from so

Answer 1

The android:foreground attribute is for a foreground selector (added to a FrameLayout).

(android:foreground属性用于前景选择器（添加到FrameLayout中）。)

It's not intended to simply draw an image.

(这并不是要简单地绘制图像。)

There is no attribute android:foreground for a textView .

(没有属性android:foreground的textView 。)

and It also doesn't make sense to put a image in foreground on a textView .

(并且它也没有意义把一个图像中的前景上textView 。)

To learn more about the properties and methods for a textView follow Android developer page

(要了解有关textView的属性和方法的更多信息，请遵循Android开发者页面)

And if you like to add an image on your button then use imageButton.

(如果您想在按钮上添加图像，请使用imageButton。)