Remove "method Is Never Used" Warning For Onclick Annotation In Android Studio

Sorry if this question has been asked before. I am using the Butterknife 5.0 with the latest version of Android Studio(0.5.7). How can I remove the 'Method is never used' warning f

Solution 1:

The correct way in Android Studio to suppress these warnings is to press Alt+Enter on the method giving the Method 'yourFunction()' is never used warning, and selecting

Suppress for methods annotated by'butterknife.OnClick'

Solution 2:

Simply add this annotation:

@SuppressWarnings("unused")

Just like that:

@SuppressWarnings("unused")
@OnClick(R.id.myButton)
public void clickHandler()
{
    // ...
}

My personal preference (which I see as good practice) is to add a comment with a brief explanation:

@SuppressWarnings("unused")// it's actually used, just injected by Butter Knife

Solution 3:

Osvald's answer is spot on.

However, if you want to avoid suppressing warnings separately for each type of butterknife annotation, follow his instructions, and then open up .idea/misc.xml and find this section:

<componentname="EntryPointsManager"><entry_pointsversion="2.0" /><listsize="1"><itemindex="0"class="java.lang.String"itemvalue="butterknife.OnClick" /></list></component>

Therein, simply replace butterknife.OnClick with butterknife.*.

From now on, all your injected event handlers will evade the warning.

Solution 4:

Add another dependency for the compiler:

Gradle

dependencies {
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.4.0'// new line
    compile 'com.jakewharton:butterknife:8.4.0'// original library
}

This is recommended on the official website.

Remember to Build -> Rebuild Project, so it will generate usages and make the warning go away.