(#) Missing Parcelable `CREATOR` field !!! ERROR: Missing Parcelable `CREATOR` field This is an error. Id : `ParcelCreator` Summary : Missing Parcelable `CREATOR` field Severity : Error Category : Correctness Platform : Android Vendor : Android Open Source Project Feedback : https://issuetracker.google.com/issues/new?component=192708 Since : Initial Affects : Kotlin and Java files Editing : This check runs on the fly in the IDE editor See : https://developer.android.com/reference/android/os/Parcelable.html Implementation : [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/ParcelDetector.java) Tests : [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/ParcelDetectorTest.java) Copyright Year : 2013 According to the `Parcelable` interface documentation, "Classes implementing the Parcelable interface must also have a static field called `CREATOR`, which is an object implementing the `Parcelable.Creator` interface." !!! Tip This lint check has an associated quickfix available in the IDE. (##) Example Here is an example of lint warnings produced by this check: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text src/test/bytecode/MyParcelable1.java:6:Error: This class implements Parcelable but does not provide a CREATOR field [ParcelCreator] public class MyParcelable1 implements Parcelable { ------------- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Here are the relevant source files: `src/test/bytecode/MyParcelable1.java`: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~java linenumbers package test.bytecode; import android.os.Parcel; import android.os.Parcelable; public class MyParcelable1 implements Parcelable { @Override public int describeContents() { return 0; } @Override public void writeToParcel(Parcel arg0, int arg1) { } } ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ `src/test/bytecode/MyParcelable2.java`: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~java linenumbers package test.bytecode; import android.os.Parcel; import android.os.Parcelable; public class MyParcelable2 implements Parcelable { public static final Parcelable.Creator CREATOR = new Parcelable.Creator() { public MyParcelable2 createFromParcel(Parcel in) { return new MyParcelable2(); } public MyParcelable2[] newArray(int size) { return new MyParcelable2[size]; } }; @Override public int describeContents() { return 0; } @Override public void writeToParcel(Parcel arg0, int arg1) { } } ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ `src/test/bytecode/MyParcelable3.java`: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~java linenumbers package test.bytecode; import android.os.Parcel; import android.os.Parcelable; public class MyParcelable3 implements Parcelable { public static final int CREATOR = 0; // Wrong type @Override public int describeContents() { return 0; } @Override public void writeToParcel(Parcel arg0, int arg1) { } } ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ `src/test/bytecode/MyParcelable4.java`: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~java linenumbers package test.bytecode; import android.os.Parcel; import android.os.Parcelable; public abstract class MyParcelable4 implements Parcelable { @Override public int describeContents() { return 0; } @Override public void writeToParcel(Parcel arg0, int arg1) { } } ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ `src/test/bytecode/MyParcelable5.java`: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~java linenumbers package test.bytecode; import android.os.Parcelable; public interface MyParcelable5 extends Parcelable { @Override public int describeContents(); } ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ You can also visit the [source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/ParcelDetectorTest.java) for the unit tests for this check to see additional scenarios. The above example was automatically extracted from the first unit test found for this lint check, `ParcelDetector.testParcelables`. To report a problem with this extracted sample, visit https://issuetracker.google.com/issues/new?component=192708. (##) Suppressing You can suppress false positives using one of the following mechanisms: * Using a suppression annotation like this on the enclosing element: ```kt // Kotlin @Suppress("ParcelCreator") fun method() { problematicStatement() } ``` or ```java // Java @SuppressWarnings("ParcelCreator") void method() { problematicStatement(); } ``` * Using a suppression comment like this on the line above: ```kt //noinspection ParcelCreator problematicStatement() ``` * Using a special `lint.xml` file in the source tree which turns off the check in that folder and any sub folder. A simple file might look like this: ```xml <?xml version="1.0" encoding="UTF-8"?> <lint> <issue id="ParcelCreator" severity="ignore" /> </lint> ``` Instead of `ignore` you can also change the severity here, for example from `error` to `warning`. You can find additional documentation on how to filter issues by path, regular expression and so on [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html). * In Gradle projects, using the DSL syntax to configure lint. For example, you can use something like ```gradle lintOptions { disable 'ParcelCreator' } ``` In Android projects this should be nested inside an `android { }` block. * For manual invocations of `lint`, using the `--ignore` flag: ``` $ lint --ignore ParcelCreator ...` ``` * Last, but not least, using baselines, as discussed [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).