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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.common.value.qual;

import org.checkerframework.framework.qual.InvisibleQualifier;
import org.checkerframework.framework.qual.SubtypeOf;
import org.checkerframework.framework.qual.TargetLocations;
import org.checkerframework.framework.qual.TypeUseLocation;

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;

/**
 * The bottom type in the Constant Value type system. Programmers should rarely write this type.
 *
 * @checker_framework.manual #constant-value-checker Constant Value Checker
 * @checker_framework.manual #bottom-type the bottom type
 */
@Documented
@Retention(RetentionPolicy.CLASS)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@TargetLocations({TypeUseLocation.UPPER_BOUND, TypeUseLocation.LOWER_BOUND})
@SubtypeOf({
    ArrayLen.class,
    BoolVal.class,
    DoubleVal.class,
    IntVal.class,
    StringVal.class,
    MatchesRegex.class,
    DoesNotMatchRegex.class,
    ArrayLenRange.class,
    IntRange.class,
    IntRangeFromPositive.class,
    IntRangeFromGTENegativeOne.class,
    IntRangeFromNonNegative.class
})
@InvisibleQualifier
public @interface BottomVal {}