Android: How to store array of strings in SharedPreferences for android

Question

I'm building an app which searches the web using search engine. I have one edittext in my app from which user will search the web. I want to save the search keywords just like browser history does. I'm able to save and display it with the last keyword but I can't increase the number of searches result. I want to display the last 5 searhes. Here is my code :

public class MainActivity extends Activity implements OnClickListener {

Button insert;
EditText edt;
TextView txt1, txt2, txt3, txt4, txt5;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    edt = (EditText) findViewById(R.id.search_word);

    txt1 = (TextView) findViewById(R.id.txt1);
    txt1.setOnClickListener(this);

    insert = (Button) findViewById(R.id.insert);
    insert.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            if ((edt.getText().toString().equals(""))) {
                Toast.makeText(
                        getBaseContext(),
                        "Whoa! You haven't entered anything in the search box.",
                        Toast.LENGTH_SHORT).show();

            } else {
                SharedPreferences app_preferences = PreferenceManager
                        .getDefaultSharedPreferences(MainActivity.this);
                SharedPreferences.Editor editor = app_preferences.edit();
                String text = edt.getText().toString();
                editor.putString("key", text);
                editor.commit();
                Toast.makeText(getBaseContext(), text, Toast.LENGTH_LONG)
                        .show();
            }

        }
    });
}

@Override
protected void onStart() {
    // TODO Auto-generated method stub
    super.onStart();

    SharedPreferences app_preferences = PreferenceManager
            .getDefaultSharedPreferences(this);
    String text = app_preferences.getString("key", "null");
    txt1.setText(text);
}

public void onClick(View v) {
    String text = txt1.getText().toString();
    Toast.makeText(getBaseContext(), text, Toast.LENGTH_SHORT).show();

}

}

Please help me in overcoming this problem.

I have seen that thing, but that was not helping me, I was not able to put the Strings from that. — Anupam
– Anupam, Commented Sep 10, 2012 at 11:42
You can use gson to save array stackoverflow.com/a/22985657/1577792 — Sinan Kozak
– Sinan Kozak, Commented Nov 27, 2014 at 23:39

Aditya Nikhade · Accepted Answer · 2012-09-10 11:36:13Z

32

SAVE ARRAY

public boolean saveArray(String[] array, String arrayName, Context mContext) {   
    SharedPreferences prefs = mContext.getSharedPreferences("preferencename", 0);  
    SharedPreferences.Editor editor = prefs.edit();  
    editor.putInt(arrayName +"_size", array.length);  
    for(int i=0;i<array.length;i++)  
        editor.putString(arrayName + "_" + i, array[i]);  
    return editor.commit();  
}

LOAD ARRAY

public String[] loadArray(String arrayName, Context mContext) {  
    SharedPreferences prefs = mContext.getSharedPreferences("preferencename", 0);  
    int size = prefs.getInt(arrayName + "_size", 0);  
    String array[] = new String[size];  
    for(int i=0;i<size;i++)  
        array[i] = prefs.getString(arrayName + "_" + i, null);  
    return array;  
}

answered Sep 10, 2012 at 11:36

Aditya Nikhade

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8 Comments

Anupam Over a year ago

Thanks for that. One thing, for saving the Strings array, I'll have to place SAVE ARRAY onClick() and LOAD ARRAY onStart() function. Hope you have seen my code, what I'm trying to do.

Aditya Nikhade Over a year ago

did u get what u wanted? or tell me what exactly u want to do

Anupam Over a year ago

onClick I want to store strings from the edittext one by one. And onStart() I have to display the Strings which I have stored.

Aditya Nikhade Over a year ago

so simply use these two methods in onCLick and onStart!!

Anupam Over a year ago

Exactly can you tell me how to do that. Because I'm not able to do that.

|

Sinan Kozak · Accepted Answer · 2017-07-17 10:38:32Z

0

Convert your array or object to Json with Gson library and store your data as String in json format.

Save;

SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
Editor editor = sharedPrefs.edit();
Gson gson = new Gson();

String json = gson.toJson(arrayList);

editor.putString(TAG, json);
editor.commit();

Read;

SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(context);
Gson gson = new Gson();
String json = sharedPrefs.getString(TAG, null);
Type type = new TypeToken<ArrayList<ArrayObject>>() {}.getType();
ArrayList<ArrayObject> arrayList = gson.fromJson(json, type);

Original answer: Storing Array List Object in SharedPreferences

answered Jul 17, 2017 at 10:38

Sinan Kozak

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