インタフェース, impl, Factory実装

utils/src/main/java/one/nem/kidshift/utils/SharedPrefUtils.java

@@ -0,0 +1,17 @@
+package one.nem.kidshift.utils;
+
+import android.content.SharedPreferences;
+
+import java.util.List;
+
+public interface SharedPrefUtils {
+
+    // Single
+    <T> String saveObject(String key, T object);
+    <T> String saveObject(T object); // auto generate key
+    <T> T getObject(String key, Class<T> clazz);
+
+    // Common
+    void reset();
+    void remove(String key);
+}

utils/src/main/java/one/nem/kidshift/utils/factory/SharedPrefUtilsFactory.java

@@ -0,0 +1,9 @@
+package one.nem.kidshift.utils.factory;
+
+import dagger.assisted.AssistedFactory;
+import one.nem.kidshift.utils.impl.SharedPrefUtilsImpl;
+
+@AssistedFactory
+public interface SharedPrefUtilsFactory {
+    SharedPrefUtilsImpl create(String name);
+}

utils/src/main/java/one/nem/kidshift/utils/impl/SharedPrefUtilsImpl.java

@@ -0,0 +1,64 @@
+package one.nem.kidshift.utils.impl;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+
+import com.google.gson.Gson;
+
+import java.util.List;
+
+import dagger.assisted.Assisted;
+import dagger.assisted.AssistedInject;
+import dagger.hilt.android.qualifiers.ApplicationContext;
+import one.nem.kidshift.utils.SharedPrefUtils;
+
+public class SharedPrefUtilsImpl implements SharedPrefUtils {
+
+    private final Context applicationContext;
+    private final String name;
+    private final Gson gson;
+
+    private SharedPreferences sharedPreferences;
+    private SharedPreferences.Editor editor;
+
+    @AssistedInject
+    public SharedPrefUtilsImpl(@ApplicationContext Context applicationContext, @Assisted String name) {
+        this.applicationContext = applicationContext;
+        this.name = name;
+        this.gson = new Gson();
+
+        // Get the shared preferences
+        sharedPreferences = applicationContext.getSharedPreferences(name, Context.MODE_PRIVATE);
+        editor = sharedPreferences.edit();
+    }
+
+
+    @Override
+    public <T> String saveObject(String key, T object) {
+        String json = gson.toJson(object);
+        editor.putString(key, json).apply();
+        return key;
+    }
+
+    @Override
+    public <T> String saveObject(T object) {
+        String key = String.valueOf(sharedPreferences.getAll().size());
+        return saveObject(key, object);
+    }
+
+    @Override
+    public <T> T getObject(String key, Class<T> clazz) {
+        String json = sharedPreferences.getString(key, null);
+        return gson.fromJson(json, clazz);
+    }
+
+    @Override
+    public void reset() {
+        editor.clear().apply();
+    }
+
+    @Override
+    public void remove(String key) {
+        editor.remove(key).apply();
+    }
+}