How should i save my app data in my android app?

Question

I am making my first android app. I want to save an array of strings in one activity and then in second activity i want to show those strings as a list. I am using android platform 2.2 with API 8 So i can not use putStringSet(). Is there any way to save my data as a text file in my app? Then may be i can just add a new line in that file whenever user adds a new string. And while making list view i can parse it on basis of new line and make string array. Thanks for your help.

Answer 1

Use File Handling. Easy to use for beginners and efficient for your purpose.

http://developer.android.com/guide/topics/data/data-storage.html#filesInternal

Answer 2

There is a method putStringArrayListExtra("id", ArrayList list) in Intent to use before starting it. Then in the launched Activity from the Intent, use getStringArrayList("id") .

For example:

Intent intent = new Intent(MainActivity.this.getApplicationContext(), NewActivity.class);
intent.putStringArrayListExtra("id", yourArrayList)
MainActivity.this.startActivity(intent);

Then on NewActivity onCreate() method

ArrayList<String> list = getIntent().getExtras().getStringArrayList("id");

Answer 3

But you can use putStringArray, or putStringArrayList wrapped into a Bundle.

Bundle are passed via Intents.

-> http://developer.android.com/reference/android/os/Bundle.html#putStringArray(java.lang.String , java.lang.String[])

Then, if you want to save it as a file, then you have to use this method : http://www.java-forums.org/advanced-java/13852-saving-arraylist-file.html

But i think you prefer pass the String list directly.

Answer 4

Why are you using files for that? Just check sharedPreferences and sqliteDb It may work for you..shared preferences are easy to handle