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checker-qual-android contains annotations (type qualifiers) that a programmer writes to specify Java code for type-checking by the Checker Framework. The checker-qual-android artifact is identical to the checker-qual artifact, except that in checker-qual-android annotations have classfile retention. The default Android Gradle plugin retains types annotated with runtime annotations in the main dex, but strips out class-retention annotations.

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package org.checkerframework.checker.nullness.qual;

import org.checkerframework.framework.qual.PolymorphicQualifier;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * A polymorphic qualifier for the non-null type system.
 *
 * Any method written using {@link PolyNull} conceptually has two versions: one in which every
 * instance of {@link PolyNull} has been replaced by {@link NonNull}, and one in which every
 * instance of {@link PolyNull} has been replaced by {@link Nullable}.
 *
 * @checker_framework.manual #nullness-checker Nullness Checker
 * @checker_framework.manual #qualifier-polymorphism Qualifier polymorphism
 */
@Documented
@Retention(RetentionPolicy.CLASS)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@PolymorphicQualifier(Nullable.class)
public @interface PolyNull {}