How to Store Hashmap to android so that it will be reuse when application restart using shared preferences?

Question

I want to store hashmap to my android application that when restart ,it shows last saved values of hashmap.

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Answer 1

using Raghav's I created a complete working example:

public class AppCache {
public static HashMap hashMap = null;

/* REPOSITORY NAME */
public static final String REPOSITORY_NAME = "HMIAndroid_System_Settings";

/* SETTINGS */
public static final String SETTING_PLANNED = "DATA_PLANNED";
public static final String SETTING_ACTUAL = "DATA_ACTUAL";
public static final String SETTING_ETA = "DATA_ETA";
public static final String SETTING_OR = "DATA_OR";
public static final String SETTING_LINEID = "LINEID";
public static final String SETTING_SERVERIP = "SERVERIP";

public static void LoadSettings(Context context) {
    SharedPreferences pref = context.getSharedPreferences(REPOSITORY_NAME, Context.MODE_PRIVATE);
    hashMap = (HashMap) pref.getAll();
    if(hashMap == null) {
        hashMap = new HashMap();
    }
}

public static void SaveSettings(Context context) {
    if(hashMap == null) {
        hashMap = new HashMap();
    }

    //persist
    SharedPreferences pref = context.getSharedPreferences(REPOSITORY_NAME, Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = pref.edit();
    for (String s : hashMap.keySet()) {
        editor.putString(s, hashMap.get(s));
    }
    editor.commit();
}
}

Then in your onCreate load it:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //load settings
    AppCache.LoadSettings(getApplicationContext());
    Log.d("onCreate","My LineID=" + AppCache.hashMap.get(AppCache.SETTING_LINEID));
    Log.d("onCreate","Dest ServerIP=" + AppCache.hashMap.get(AppCache.SETTING_SERVERIP));
}

at any time anywhere in your app update settings:

AppCache.hashMap.put(AppCache.SETTING_LINEID, "1");
AppCache.hashMap.put(AppCache.SETTING_SERVERIP, "192.168.1.10");

in your onDestroy save settings to cache:

@Override
protected  void onDestroy() {
    //save settings
    AppCache.SaveSettings(getApplicationContext());
}