Lint errors if minSdk < 11

[grandstaish]

Apparently Realm should work on Android all the way down to API 9 (https://realm.io/docs/java/latest/#prerequisites), but if your minSdk is below 11, you get a whole bunch of lint errors that break the build (even with a new Realm sample).

[zaki50]

I couldn't reproduce this.

Could you share your build.gradle?

[grandstaish]

Sure, though it's a pretty basic gradle file. I was just trying Realm out:

apply plugin: 'com.android.application'
apply plugin: 'realm-android'

android {
  compileSdkVersion rootProject.ext.compileSdkVersion  // <-- this is 24
  buildToolsVersion rootProject.ext.buildToolsVersion  // <-- this is 24.0.2

  defaultConfig {
    applicationId "nz.bradcampbell.realmexample"
    minSdkVersion rootProject.ext.minSdkVersion // <-- this is 9
    targetSdkVersion rootProject.ext.targetSdkVersion // <-- this is 24
    versionCode 1
    versionName "1.0"
  }

  compileOptions {
    sourceCompatibility rootProject.ext.sourceCompatibilityVersion  // <-- this is 1.7
    targetCompatibility rootProject.ext.targetCompatibilityVersion // <-- this is 1.7
  }
}

dependencies {
  compile deps.supportAnnotations // latest
  compile deps.appCompat // latest
}

The errors were all to do with JsonReader APIs:

e.g.:

• Call requires API level 11 (current min is 9): android.util.JsonReader#beginObject
• Call requires API level 11 (current min is 9): android.util.JsonReader#hasNext
• Etc.

Are you suppressing your lint errors?

[kneth]

The proxy classes have @SuppressWarnings("cast").

[Zhuinden]

@kneth this discussion reminds me of #489 (comment)

[zaki50]

@grandstaish Thank you for providing detailed information.

I reproduced this issue.
./gradlew :app:lint reports errors of NewApi: Calling new methods on older versions.

Realm has a method that uses JsonReader in proxy classed but that method does not have @TargetApi(Build.VERSION_CODES.HONEYCOMB).
Because of this, lint reports errors even if the method is not used at all from user code.

It's a bug of Realm and should be fixed.

And we should update our documentation about limited support of Realm#create*FromJson() methods that take InputStream as a parameter.
Those methods only support Android 3.0 or later, but it is not mentioned in our documentation (those methods have an annotation of @TargetApi(Build.VERSION_CODES.HONEYCOMB) but the annotation is not shown in our API reference).

[zaki50]

Fixed in releases branch.
This issue will be solved in next release.