Using kotlin with ContentResolver threw IllegalArgumentException
I am trying to write an application with Kotlin. I have put contentprovider sql query on another process. Application crashed when requesting ContentResolver in main process.
Code:
protected fun select(uri: Uri, sql: String, vararg args: Any): Cursor {
val sArgs = Array(args.size(), { i -> lang.String.valueOf(args.get(i)) })
return context.getContentResolver().query(uri, null, sql, sArgs, null)
}
public fun selectAllAccounts(): Array<Account> {
val cursor = select(parseUri(AccountSchema.TABLE_NAME), "select * from " + AccountSchema.TABLE_NAME)
val accounts = Array(cursor.getCount(), { i ->
if (!cursor.moveToPosition(i)) {
throw RuntimeException("Cursor move failed")
}
Account(context, cursor)
})
return accounts
}
It will throw an IllegalArgumentException:
05-20 10:27:21.120 3337-3337/com.kescoode.yomail E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.kescoode.yomail, PID: 3337
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.kescoode.yomail/com.kescoode.yomail.ui.activity.HomeActivity}: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter projection
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2212)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2271)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1205)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5146)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter projection
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:167)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:137)
at android.content.ContentProviderProxy.query(ContentProviderNative.java:420)
at android.content.ContentResolver.query(ContentResolver.java:461)
at android.content.ContentResolver.query(ContentResolver.java:404)
at com.kescoode.yomail.db.Dao.select(internal.kt:33)
at com.kescoode.yomail.db.AccountDao.selectAllAccounts(AccountDao.kt:21)
at com.kescoode.yomail.App.isLogged(App.kt:28)
at com.kescoode.yomail.ui.activity.HomeActivity.onCreate(HomeActivity.kt:17)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2169
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By default, all variables and parameters in Kotlin are non-zero. You are passing a null parameter to your function. If you want to pass a null parameter, you need to add a character ?
to the type of the parameter, eg uri: Uri?
. But your best bet is to check if the parameter you want to pass to the function is null and handle that situation. For more information, you can check this article http://kotlinlang.org/docs/reference/null-safety.html
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