Android Realm占用大量数据空间

Question

我目前正在开发一个使用 Realm 保存记录的 CRM Android 应用程序。我正在从网络服务器同步数据。有 10 个表。这个表有大约 450 页，这样每页包含 100 条记录(100 行的数据)获取 10 个表的记录后，我的应用程序的数据大小已增长到 118MB。

Is this much space taking normal for Realm? ---> 118MB.

还是我在 Realm 上做错了什么？我已经检查了我的记录是否重复。没有重复，每一行只保存一次。

我就是这样配置 Realm 的应用类

realmConfig = new RealmConfiguration.Builder(this).build();
Realm.setDefaultConfiguration(realmConfig);

后来，我在任何需要的地方都使用了 Default 实例。并在 Application 类的 onTerminate 上关闭 Realm

更多信息:安卓工作室版本=2.1.3

Realm 版本 = 1.2.0

设备 = Nexus 5 Marshmallow

用于在数据库中保存记录的 My Intent 服务。每次页面响应后都会调用它。

public class SaveTableRecord extends Base_IntentService {

    private static final String ACTION_SAVE_RECORDS = "saveRecords";
    private static final String EXTRA_CLASS = "classVar";
    private static final String EXTRA_TABLE_JSON = "tabJson";
    private static final String LOG_TAG = "saveTableRecord";

    private String json, className;
    Realm realm;
    private Gson gson;

    public SaveTableRecord() {
        super("SaveTableRecord");
    }

    public static void startSavingRecord(Context context, String cls, String tableJson) {
        Log.i("Service", "SAVETABLERECORD.CLASS started");
        Intent intent = new Intent(context, SaveTableRecord.class);
        intent.setAction(ACTION_SAVE_RECORDS);
        intent.putExtra(EXTRA_TABLE_JSON, tableJson);
        intent.putExtra(EXTRA_CLASS, cls);
        context.startService(intent);
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        if (intent != null) {
            className = intent.getStringExtra(EXTRA_CLASS);
            json = intent.getStringExtra(EXTRA_TABLE_JSON);
            initGsonDataTypes();
            initRecordSaving();
        }
    }


    private void initGsonDataTypes() {
        GsonBuilder builder = new GsonBuilder();
        //  builder.setLongSerializationPolicy(LongSerializationPolicy.STRING);
        builder.registerTypeAdapter(long.class, new LongTypeAdapter());
        builder.registerTypeAdapter(double.class, new DoubleTypeAdapter());
        builder.registerTypeAdapter(int.class, new IntTypeAdapter());
        builder.registerTypeAdapter(short.class, new ShortTypeAdapter());
        builder.registerTypeAdapter(boolean.class, new BooleanTypeAdapter());
        builder.registerTypeAdapter(Date.class, new GsonUTCDateAdapter());
        builder.setExclusionStrategies(new ExclusionStrategy() {
            @Override
            public boolean shouldSkipField(FieldAttributes f) {
                return f.getDeclaringClass().equals(RealmObject.class);
            }

            @Override
            public boolean shouldSkipClass(Class<?> clazz) {
                return false;
            }
        });
        builder.setPrettyPrinting();
        gson = builder.create();
    }

    private void initRecordSaving() {
        try {
            realm = Realm.getDefaultInstance();
            showLog("-------------------InitRecordSaving()--------------------");
            final JSONObject main = new JSONObject(json);
            final JSONArray jsonArray = main.getJSONArray("records");
            //  String json = main.getString("records");
            //  saveATableRecord(json);

            realm.executeTransaction(new Realm.Transaction() {
                @Override
                public void execute(Realm realm) {

                    for (int i = 0; i < jsonArray.length(); i++) {
                        try {
                            String tableString = jsonArray.getString(i);
                            saveATableRecord(tableString);
                        } catch (Exception ex) {
                            showLog("EXCEPTION A ");
                        }
                    }
                }
            });


        } catch (Exception e) {
            //   showLog("EXCEPTION!!!! SAVETABLERECORD CLASS");
            e.printStackTrace();
        }
    }

    private void saveATableRecord(String tableData) {

        showLog("Table name =" + className + " AND Data = " + tableData);

        try {
            Class cls = Class.forName("com.oper.max.model.db.sync_tables." + className);
            Object obj = gson.fromJson(tableData, cls);
            // realm.beginTransaction();
            realm.copyToRealmOrUpdate((RealmObject) obj);
            // realm.commitTransaction();
            showLog("Object Added successfully");

        } catch (Exception e) {
            // realm.commitTransaction();
            showLog("Exception in saveATableRecord = " + e.getMessage().toString());
            e.printStackTrace();
        }
    }
}

Answer 1

您没有关闭您的 Realm 实例，您应该始终在非循环后台线程上关闭您的 Realm 实例。

改变这个:

private void initRecordSaving() {
    try {
        realm = Realm.getDefaultInstance();
        showLog("-------------------InitRecordSaving()--------------------");
        final JSONObject main = new JSONObject(json);
        final JSONArray jsonArray = main.getJSONArray("records");
        //  String json = main.getString("records");
        //  saveATableRecord(json);

        realm.executeTransaction(new Realm.Transaction() {
            @Override
            public void execute(Realm realm) {

                for (int i = 0; i < jsonArray.length(); i++) {
                    try {
                        String tableString = jsonArray.getString(i);
                        saveATableRecord(tableString);
                    } catch (Exception ex) {
                        showLog("EXCEPTION A ");
                    }
                }

            }
        });


    } catch (Exception e) {
        //   showLog("EXCEPTION!!!! SAVETABLERECORD CLASS");
        e.printStackTrace();
    }
}

private void saveATableRecord(String tableData) {

    showLog("Table name =" + className + " AND Data = " + tableData);

    try {
        Class cls = Class.forName("com.oper.max.model.db.sync_tables." + className);
        Object obj = gson.fromJson(tableData, cls);
        // realm.beginTransaction();
        realm.copyToRealmOrUpdate((RealmObject) obj);
        // realm.commitTransaction();
        showLog("Object Added successfully");

    } catch (Exception e) {
        // realm.commitTransaction();
        showLog("Exception in saveATableRecord = " + e.getMessage().toString());
        e.printStackTrace();
    }

}

对此:

private void initRecordSaving() {
    Realm realm = null;
    try {
        realm = Realm.getDefaultInstance();
        showLog("-------------------InitRecordSaving()--------------------");
        final JSONObject main = new JSONObject(json);
        final JSONArray jsonArray = main.getJSONArray("records");
        //  String json = main.getString("records");
        //  saveATableRecord(json);

        realm.executeTransaction(new Realm.Transaction() {
            @Override
            public void execute(Realm realm) {

                for (int i = 0; i < jsonArray.length(); i++) {
                    try {
                        String tableString = jsonArray.getString(i);
                        saveATableRecord(realm, tableString);
                    } catch (Exception ex) {
                        showLog("EXCEPTION A ");
                    }
                }

            }
        });
    } catch (Exception e) {
        //   showLog("EXCEPTION!!!! SAVETABLERECORD CLASS");
        e.printStackTrace();
    } finally {
        if(realm != null) {
            realm.close();
        }
    }
}

private void saveATableRecord(Realm realm, String tableData) {

    showLog("Table name =" + className + " AND Data = " + tableData);

    try {
        Class cls = Class.forName("com.oper.max.model.db.sync_tables." + className);
        Object obj = gson.fromJson(tableData, cls);
        // realm.beginTransaction();
        realm.copyToRealmOrUpdate((RealmObject) obj);
        // realm.commitTransaction();
        showLog("Object Added successfully");

    } catch (Exception e) {
        // realm.commitTransaction();
        showLog("Exception in saveATableRecord = " + e.getMessage().toString());
        e.printStackTrace();
    }

}