如何使用SharedPreferences将数据从活动传递到另一个活动

Question

i'm trying to pass my data from first activity to another activity say it fourth activity. i'm using the code on onClick for button in first activity where the data comes from and also in onclick button in fourth activity when the data want to pass from first activity. but it wont work. it just pass the 0 data which is i set it for default. please help

this is SharedPreferences code in my first activity

SharedPreferences sharedPreferences = getSharedPreferences("userInfo", Context.MODE_PRIVATE);

SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putInt("user_id", user_id);
editor.putString("username", usernameJ);
editor.putString("name", name);
editor.putString("email", email);
editor.apply();

and this is SharedPreferences code in my four activity:

SharedPreferences sharedPreferences = getSharedPreferences("userInfo", Context.MODE_PRIVATE);
user_id = sharedPreferences.getInt("user_id", 0);
new UbahLapor().execute();

Answer 1

editor.apply() does the work in a thread (asynchronous), So it might take time.

so try

 editor.apply();

instance of

 editor.commit;

Answer 2

Save your preferences this way (provided that user_id , username , name and email have already been declared and assigned values):

SharedPreferences.Editor editor = PreferenceManager.getDefaultSharedPreferences(this).edit();
editor.putInt("user_id", user_id);
editor.putString("username", usernameJ);
editor.putString("name", name);
editor.putString("email", email);
editor.apply();

and read it back:

SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
user_id = sharedPreferences.getInt("user_id", 0);

Answer 3

You need to use editor.commit() instead of editor.apply() .

apply() updates your sharedprefernces asynchronously. commit() updates your sharedprefernces synchronously. Note that commit() is a blocking call.

Answer 4

Ty this

First if you store data using shared preference then try:

SharedPreferences.Editor editor = 
PreferenceManager.getDefaultSharedPreferences(this).edit();
editor.putString("username", username);
editor.putString("name", name);
editor.apply();

get data using shared preference

SharedPreferences sharedPreferences = getSharedPreferences("userInfo", Context.MODE_PRIVATE);
username= sharedPreferences.getString("username", null);

Second you pass the data first activity to another activity using intent then try:

    Intent intent = new Intent(activity, activityClass);
    intent.putExtra("message", text);
    activity.startActivity(intent);

get the data using intent

    Intent intent=getIntent();
    success_msg_txt.setText(intent.getStringExtra("message"));