Button opacity/transparency
Solution 1
check How to Set Opacity (Alpha) for View in Android
You can set transparency on background of objects, use #XX808080, where XX is the alpha/transparency value.
android:background="#80FF0000"
this will be a half-transparent red background.
You can set transparency on the button text using the textColor property in the same manner:
android:textColor="#80FF0000"
You can also achieve through code in an animation
AlphaAnimation alphaAnim = new AlphaAnimation(1.0f, 0.5f);
alphaAnim.setDuration (400);
myButton.getBackground().startAnimation(alphaAnim); // set alpha on background
or directly:
myButton.getBackground().setAlpha(0.5f); // added in API 11, sets alpha on background
both methods set the alpha to 50%
Lastly, you can try adding android:alpha for your XML:
<Button
android:id="@+id/button2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/zece"
android:textStyle="bold"
android:textColor="#808080"
android:alpha="0.5"
/>
Solution 2
You probably cant change its opacity with code, because they are 9patches. You need to create your own 9patch and set it to buttons as background. If you want a solid color, of course you can also use something like:
android:background="#80363636"
Here #AARRGGBB, how low you keep first two digits you get that opacity
user3104504
Updated on December 18, 2020Comments
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user3104504 over 3 years
main.xml:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/background" android:gravity="center" android:color="#66FF0000" > <Button android:id="@+id/button1" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/noua" android:textStyle="bold" android:textColor="#808080" /> <Button android:id="@+id/button2" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/zece" android:textStyle="bold" android:textColor="#808080" /> <Button android:id="@+id/button3" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/unspe" android:textStyle="bold" android:textColor="#808080" /> <Button android:id="@+id/button4" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/doispe" android:textStyle="bold" android:textColor="#808080" /> </LinearLayout>
This is my main.xml, I am trying to make the buttons the most transparent, but I want still to see them and I don't know what to add and where to add, please correct my xml with the low opacity on bottons. Premeditated thank you:D
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dangVarmit over 10 yearsI don't think you can set the alpha in the xml file. There's no drawable resource that allows it [see developer.android.com/guide/topics/resources/… ]. You'll have to either set the alpha in code or make your own semi-transparent background drawable and use that