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Realm インスタンスを取得するためのユーティリティクラスはこんな感じか? Application#onCreate() で setupDatabase() を呼んで、 Activity/Fragment#onCreate() で getRealm() して onDestroy() で Realm#close()
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import android.content.Context; | |
import java.io.File; | |
import io.realm.Realm; | |
import io.realm.RealmMigration; | |
import io.realm.exceptions.RealmMigrationNeededException; | |
public class RealmUtils { | |
Applicati | |
private static final long SCHEMA_VERSION = 1; | |
private static final String DATABASE_NAME = "foo.realm"; | |
public static Realm getRealm(Context context) { | |
return Realm.getInstance(context, DATABASE_NAME); | |
} | |
// これを Application#onCreate() から呼ぶ | |
public static void setupDatabase(Context context) { | |
final File dbFile = new File(context.getFilesDir(), DATABASE_NAME); | |
if (dbFile.exists()) { | |
checkAndUpdateSchema(context); | |
} else { | |
setInitialSchemaVersion(context, dbFile); | |
} | |
} | |
private static void checkAndUpdateSchema(Context context) { | |
try { | |
Realm.getInstance(context, DATABASE_NAME).close(); | |
} catch (RealmMigrationNeededException e) { | |
Realm.migrateRealmAtPath(new File(context.getFilesDir(), DATABASE_NAME).getAbsolutePath(), | |
new MyDatabaseMigration()); | |
} | |
} | |
private static void setInitialSchemaVersion(Context context, File dbFile) { | |
// set initial schema version. see https://github.com/realm/realm-java/issues/886 | |
Realm.getInstance(context, dbFile.getName()).close(); // これを呼ばないとスキーマが作成されない | |
Realm.migrateRealmAtPath(dbFile.getAbsolutePath(), (realm, version) -> SCHEMA_VERSION); | |
} | |
private static class MyDatabaseMigration implements RealmMigration { | |
@Override | |
public long execute(Realm realm, long version) { | |
if (version < 1) { | |
version = 1; | |
} | |
// 必要になったらここに移行処理を記述する | |
//if (version == 1) { | |
// // migrate to 2 | |
// | |
// version++; | |
//} | |
return SCHEMA_VERSION; | |
} | |
} | |
} |
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