recyclerview와 sharedpreference질문이요

Question

recyclerview로 간단한 메모장을 만들고 sharedpreference로 저장을 하려고 합니다.인터넷예제를 보니 arraylist<> 안에 기본형이아닌 클래스를 넣더라구요 그래서 저도 그렇게 했는데 그렇게하면 arraylist<>안에 객체가 기본자료형이 아니라서 JASON도 사용이안되고 하는데 어떻게해야될까요...코드 첨부할게요 package org.techtown.recyclerview_ms; import androidx.appcompat.app.AlertDialog; import androidx.appcompat.app.AppCompatActivity; import androidx.recyclerview.widget.DividerItemDecoration; import androidx.recyclerview.widget.GridLayoutManager; import androidx.recyclerview.widget.LinearLayoutManager; import androidx.recyclerview.widget.RecyclerView; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.os.Bundle; import android.preference.PreferenceManager; import android.view.GestureDetector; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; import org.json.JSONArray; import org.json.JSONException; import java.lang.reflect.Array; import java.util.ArrayList; import java.util.Dictionary; import java.util.HashSet; import java.util.Set; import javax.xml.transform.Result; public class MainActivity extends AppCompatActivity { private ArrayList mArrayList; private MsRecyclerAdapter mAdapter; private Data data; //private int count = 0; private void setStringArrayPref(Context context, String key, ArrayList values) { SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context); SharedPreferences.Editor editor = prefs.edit(); JSONArray a = new JSONArray(); for (int i = 0; i < values.size(); i++) { a.put(values.get(i)); } if (!values.isEmpty()) { editor.putString(key, a.toString()); } else { editor.putString(key, null); } editor.apply(); } private ArrayList getStringArrayPref(Context context, String key) { SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context); String json = prefs.getString(key, null); ArrayList urls = new ArrayList(); if (json != null) { try { JSONArray a = new JSONArray(json); for (int i = 0; i < a.length(); i++) { String url = a.optString(i); urls.add(url); } } catch (JSONException e) { e.printStackTrace(); } } return urls; } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); RecyclerView recyclerView = (RecyclerView) findViewById(R.id.mainRecyclerView); recyclerView.setHasFixedSize(true); // 크기일정하게맞추는거양 GridLayoutManager layoutManager = new GridLayoutManager(this, 2); recyclerView.setLayoutManager(layoutManager); mArrayList = new ArrayList<>(); //mAdapter = new MsRecyclerAdapter(mArrayList); mAdapter = new MsRecyclerAdapter(mArrayList, this); recyclerView.setAdapter(mAdapter); DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(recyclerView.getContext(), layoutManager.getOrientation()); recyclerView.addItemDecoration(dividerItemDecoration); // 구분선 recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getApplicationContext(), recyclerView, new ClickListener() { @Override public void onClick(View view, int position) { data = mArrayList.get(position); Intent intent = new Intent(getBaseContext(), ResultActivity.class); intent.putExtra("title", data.getTitle()); intent.putExtra("subtitle", data.getSubtitle()); intent.putExtra("contents", data.getContents()); startActivity(intent); } @Override public void onLongClick(View view, int position) { } })); Button buttonInsert = (Button) findViewById(R.id.button); buttonInsert.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // count++; // Data data = new Data(count + "", count + "일차"); // // //mArrayList.add(0, data); //RecyclerView의 첫 줄에 삽입 // mArrayList.add(data); // RecyclerView의 마지막 줄에 삽입 // // mAdapter.notifyDataSetChanged(); AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this); View view = LayoutInflater.from(MainActivity.this) .inflate(R.layout.edit_box, null, false); builder.setView(view); final Button ButtonModify = (Button) view.findViewById(R.id.box_modify); final EditText editTextTitle; editTextTitle = (EditText) view.findViewById(R.id.box_title); final EditText editTextSubTitle = (EditText) view.findViewById(R.id.box_subtitle); final EditText editTextContents = (EditText) view.findViewById(R.id.box_contents); ButtonModify.setText("삽입"); final AlertDialog dialog = builder.create(); ButtonModify.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { String strTitle = editTextTitle.getText().toString(); String strSubTitle = editTextSubTitle.getText().toString(); String strContents = editTextContents.getText().toString(); Data data = new Data(strTitle, strSubTitle, strContents); // mArrayList.add(0, data); //첫 줄에 삽입 mArrayList.add(data); //마지막 줄에 삽입 mAdapter.notifyDataSetChanged(); //변경된 데이터를 화면에 반영 dialog.dismiss(); } }); dialog.show(); } }); } public interface ClickListener { void onClick(View view, int position); void onLongClick(View view, int position); } public static class RecyclerTouchListener implements RecyclerView.OnItemTouchListener { private GestureDetector gestureDetector; private MainActivity.ClickListener clickListener; public RecyclerTouchListener(Context context, final RecyclerView recyclerView, final MainActivity.ClickListener clickListener) { this.clickListener = clickListener; gestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() { @Override public boolean onSingleTapUp(MotionEvent e) { return true; } @Override public void onLongPress(MotionEvent e) { View child = recyclerView.findChildViewUnder(e.getX(), e.getY()); if (child != null && clickListener != null) { clickListener.onLongClick(child, recyclerView.getChildAdapterPosition(child)); } } }); } @Override public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) { View child = rv.findChildViewUnder(e.getX(), e.getY()); if (child != null && clickListener != null && gestureDetector.onTouchEvent(e)) { clickListener.onClick(child, rv.getChildAdapterPosition(child)); } return false; } @Override public void onTouchEvent(RecyclerView rv, MotionEvent e) { } @Override public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) { } } }

aksjm2 · Accepted Answer

google gson 확인해보시고 java class serialize 찾아보세요.

ㅁㄴㅇㄹㅇ · Answer

답변감사합니다.

recyclerview와 sharedpreference질문이요

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