Android Studio Arctic Fox中如何忽略未使用变量类编译问题以正常编译测试代码

Problem Description #

I'm working with Android Studio Arctic Fox 2020.3.1 Patch 2, and my initial code (Code A) compiles perfectly fine. For testing purposes, I added a single line var name3 = "" to get Code B, but the compiler won't compile it, throwing the error:

Variable 'name3' is never used

Since this is just a test scenario, I don't think unused variables should block compilation. How can I configure Android Studio to ignore this type of minor issue and let Code B run?

Code A (Compiles Without Issues) #

@Composable
fun HelloScreen() {
    var name1 by rememberSaveable { mutableStateOf("") }
    HelloContent(name2 = name1, onNameChange = { name1 = it })
}

@Composable
fun HelloContent(name2: String, onNameChange: (String) -> Unit) {
    Column(modifier = Modifier.padding(16.dp)) {
        Text(
            text = "Hello, $name2",
            modifier = Modifier.padding(bottom = 8.dp),
            style = MaterialTheme.typography.h5
        )
        OutlinedTextField(
            value = name2,
            onValueChange = onNameChange,
            label = { Text("MyLabel") }
        )
    }
}

Code B (Fails to Compile) #

@Composable
fun HelloScreen() {
    var name1 by rememberSaveable { mutableStateOf("") }
    var name3 = ""
    HelloContent(name2 = name1, onNameChange = { name1 = it })
}

@Composable
fun HelloContent(name2: String, onNameChange: (String) -> Unit) {
    ...// Identical to Code A's HelloContent
}

Attempted Fix That Didn't Work #

I tried adding @SuppressWarnings and @Suppress("unused") annotations as suggested, but the compilation error persisted (error details in Image A).

Working Solution #

After some digging, I found the correct fix: modify your module-level build.gradle file (or build.gradle.kts if using Kotlin DSL) to disable treating all warnings as errors:

For Groovy:

android {
    // ... other configurations
    kotlinOptions {
        allWarningsAsErrors = false
    }
}

For Kotlin DSL:

android {
    // ... other configurations
    kotlinOptions {
        allWarningsAsErrors = false
    }
}

This setting tells the compiler to treat unused variables (and other minor warnings) as non-blocking issues, allowing Code B to compile and run successfully (details in Image B).

内容的提问来源于stack exchange，提问作者HelloCW