效果圖

源碼ParcelDetector.java

ParcelDetector實(shí)現(xiàn)了JavaPsiScanner java文件檢測接口

核心代碼

  
    @Nullable
    @Override
    public List<String> applicableSuperClasses() {
        return Collections.singletonList(CLASS_PARCELABLE);
    }

    @Override
    public void checkClass(@NonNull JavaContext context, @NonNull PsiClass declaration) {
        if (declaration instanceof PsiAnonymousClass) {
            // Anonymous classes aren't parcelable
            return;
        }

        // Only applies to concrete classes
        if (declaration.isInterface()) {
            return;
        }
        if (declaration.hasModifierProperty(PsiModifier.ABSTRACT)) {
            return;
        }

        // Parceling spans is handled in TextUtils#CHAR_SEQUENCE_CREATOR
        if (context.getEvaluator().implementsInterface(declaration,
                "android.text.ParcelableSpan", false)) {
            return;
        }

        PsiField field = declaration.findFieldByName("CREATOR", true);
        if (field == null) {
            Location location = context.getNameLocation(declaration);
            context.report(ISSUE, declaration, location,
                    "This class implements `Parcelable` but does not "
                            + "provide a `CREATOR` field");
        }
    }

實(shí)現(xiàn)函數(shù)解析

• applicableSuperClasses

這個方法用來返回你感興趣的那些父類，所以這里android.os.Parcelable(SdkConstants.CLASS_PARCELABLE )，此方法配合以下方法使用

• checkClass(JavaContext context,PsiClass declaration)

檢測到父類為以上指定的類是會觸發(fā)此方法

• 判斷是不是注解類 declaration instanceof PsiAnonymousClass

• 判斷是不是接口declaration.isInterface()

• 判斷是不是抽象類declaration.hasModifierProperty(PsiModifier.ABSTRACT)

• 判斷PsiClass是否實(shí)現(xiàn)指定接口
  JavaEvaluator.implementsInterface(PsiClass cls,String interfaceName,boolean strict)

  • interfaceName 接口名稱如：android.text.ParcelableSpan
  • strict 不清楚（大多數(shù)代碼都是false）

• 獲取成員變量PsiClass.findFieldByName(String name, boolean checkBases)

  • name 變量名
  • 是否校驗(yàn)父類