How to make button non transparent?

问题

I wrote custom View which draws a circle. Then I put it on relative layout. Also I put standard button there, so that they overlap. And I see that button is transparent. How to make it non transparent?

回答1:

The standard Holo themed button is partially transparent. You can either create a new button 9.png image to use in the button or create a new button by using drawable.

Here's a link on how to do the latter:

http://droidapp.co.uk/?p=309

回答2:

Set the background to @android:drawable/btn_default to get rid of the transparency of holo theme

回答3:

you can put the button in seperate Frame Layout so that your view wont affect the button and thats my idea

回答4:

save below code as xml in drawable folder and give this xml as button background

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <stroke android:width="0dp" android:color="#ffffff" />
    <solid android:color="#000000"/>
    <corners android:radius="1px"/>
    <padding android:left="5dp" android:top="3dp" android:right="5dp" android:bottom="3dp" /> 
</shape>

Ex:

android:background="@drawable/<< your file name>>"

回答5:

I was with the same problem but with ToggleButton. A ugly but fast solution was to position a ImageView right behind the button and change its margins, background and alpha to fit the button. For example, inside a RelativeLayout:

<ImageView
    android:layout_alignLeft="@+id/toggleButton"
    android:layout_alignBottom="@+id/toggleButton"
    android:layout_alignRight="@+id/toggleButton"
    android:layout_alignTop="@+id/toggleButton"
    style="@style/HackBackgroundToggleButton" />

<ToggleButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/toggleButton"
    ... />

And, in an effort to reduce the visible hack, the extracted style:

<style name="HackBackgroundToggleButton">
    <item name="android:layout_width">84dp</item>
    <item name="android:layout_height">42dp</item>
    <item name="android:background">#FFFFFF</item>
    <item name="android:layout_marginTop">4dp</item>
    <item name="android:layout_marginLeft">4dp</item>
    <item name="android:layout_marginRight">4dp</item>
    <item name="android:layout_marginBottom">4dp</item>
    <item name="android:alpha">0.75</item>
</style>

回答6:

The holo transparency is actually built into the PNG files. So the only real way to change it is to edit the PNGs and make them non-transparent. This is actually not easy at all. You need to multiply the alpha channel of the image by 255/102. Which isn't easy!

But because I am such a genius, I found a way to do it. Basically I copied all the relevant PNGs and XMLs into their own directory structure (the buttons only have -mdpi, -hdpi and -xhdpi versions). Then I ran this:

for FILE in find . -name *.png; do mogrify -evaluate Multiply 2.5 -channel Alpha $FILE ; done

Job done! Actually it didn't quite work for the disabled buttons for some reason - I think because the centre is super-transparent, but I don't care so much about those. You'll have to use a higher value than 2.5 for those images if you want them totally non-transparent.

Anway the result is here.

来源：https://stackoverflow.com/questions/10633040/how-to-make-button-non-transparent

标签

android

styles

transparency

z-order