앱 종료 후 에도 데이타 유지를 어떻게 하나요?

Question

안드로이드를 공부하고 있는 학생입니다.

앱 종료 후에도 데이타를 유지하기 위한 방법으로 sharedpreference를 사용하였습니다.

인터넷보고 따라서 만들어 보았는데 앱 종류후에 데이터가 유지가 되지 않는데 어느부분이 잘못되었는지 모르겠습니다.

한수 알려주세요^^

?

package arabiannight.tistory.com.sharedpreferences;   import android.app.Activity; import android.content.SharedPreferences; import android.graphics.Color; import android.os.Bundle; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.view.View.OnClickListener; import android.view.View.OnTouchListener; import android.widget.Button; import android.widget.Toast;   public class TestSharedPreferencesActivity extends Activity {           Button button1;     Button button2;     Button button3;           long[] pattern= new long[10];     String[] spattern=new String[10];           int i;           @Override     public void onCreate(Bundle savedInstanceState) {         i=0;         for(int i=0;i<10;i++){             pattern[i]=0;         }                                       super.onCreate(savedInstanceState);         setContentView(R.layout.main);                   button1 = (Button)findViewById(R.id.button1);         button2 =(Button)findViewById(R.id.button2);         button3=(Button)findViewById(R.id.button5);                                             button1.setOnClickListener(new OnClickListener() {             public void onClick(View v) {                               pattern[i]=1;             SharedPreferences pref = getSharedPreferences("pref", MODE_PRIVATE);             SharedPreferences.Editor editor = pref.edit();             editor.putLong(spattern[i], pattern[i]);             editor.commit();             i++;                    Log.d("value of button1","pattern you selected button1");                 Log.d("button1","pattern[0]"+pattern[0]);                 Log.d("button1","pattern[1]"+pattern[1]);                 Log.d("button1","pattern[2]"+pattern[2]);               }         });//end of button1                                     button2.setOnClickListener(new OnClickListener() {             public void onClick(View v) {             SharedPreferences pref = getSharedPreferences("pref", MODE_PRIVATE);                 for(int k=0;k<i;k++){                 pattern[k]=pref.getLong(spattern[k], 1);                 }                                   Log.d("value of button2","pattern you selected button2");             Log.d("value of pattern","pattern[0]"+pattern[0]);             Log.d("value of pattern","pattern[1]"+pattern[1]);             Log.d("value of pattern","pattern[2]"+pattern[2]);              }         });//end of button2                   button3.setOnClickListener(new OnClickListener() {             public void onClick(View v) {                               SharedPreferences pref = getSharedPreferences("pref", MODE_PRIVATE);                 SharedPreferences.Editor editor = pref.edit();                 editor.clear();                 editor.commit();                                   for(int i=0;i<10;i++){                     pattern[i]=0;                     //spattern[i]="0";                 }                               Log.d("value of reset","pattern you selected reset button");             Log.d("value of reset","pattern[0]"+pattern[0]);             Log.d("value of reset","pattern[1]"+pattern[1]);             Log.d("value of reset","pattern[2]"+pattern[2]);                i=0;             }         });//end of button3                       }//end of onCreate           //값 불러오기     private void getPreferences(){         SharedPreferences pref = getSharedPreferences("pref", MODE_PRIVATE);         pref.getString("hi", "");     }           // 값 저장     private void savePreferences(){         SharedPreferences pref = getSharedPreferences("pref", MODE_PRIVATE);     SharedPreferences.Editor editor = pref.edit();         //editor.putLong(pattern, pattern[i]);     editor.putString("hi", "인사");         editor.commit();     }           // 값 삭제     private void removePreferences(){         SharedPreferences pref = getSharedPreferences("pref", MODE_PRIVATE);         SharedPreferences.Editor editor = pref.edit();         editor.remove("hi");         editor.commit();     }           // 값 모두 삭제     private void removeAllPreferences(){         SharedPreferences pref = getSharedPreferences("pref", MODE_PRIVATE);         SharedPreferences.Editor editor = pref.edit();         editor.clear();         editor.commit();     }           }

 

Answer 1

key값이 spattern인데 값을 설정안해서 저장이 한개도 안되었겠네요.

값이 유지되지 않는게 아니라 값을 저장하지 못한것이죠.

PS :  savePreferences() 보면 hi라는 key값이 주어진것을 참고

http://developer.android.com/reference/android/content/SharedPreferences.html#getLong(java.lang.String, long)

Comments

답변 너무 감사합니다. ^^