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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.index.qual;

import org.checkerframework.framework.qual.SubtypeOf;

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 annotated expression evaluates to an integer greater than or equal to 1.
 *
 * As an example of a use-case for this type, consider the following code:
 *
 * 
{@code
 * if (arr.length > 0) {
 *    int j = arr[arr.length - 1];
 * }
 * }
 *
 * Without the knowing that {@code arr.length} is positive, the Index Checker cannot verify that
 * accessing the last element of the array is safe - there might not be a last element!
 *
 * @checker_framework.manual #index-checker Index Checker
 */
@Documented
@Retention(RetentionPolicy.CLASS)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@SubtypeOf({NonNegative.class})
public @interface Positive {}