I'm trying to store some strings in a shared preference file and then retrieve them in another activity, except it doesn't seem to be working. Any guidance as to where im going wrong would be much appreciated. Many thanks.
public void save(View view) {
SavePreferences("name", nameS);
SavePreferences("current", currentS);
SavePreferences("goal", goalS);
SavePreferences("CurrentBmi", cBmiS);
SavePreferences("goalBmi", gBmiS);
Toast.makeText(this, "profile Saved", Toast.LENGTH_SHORT).show();
startActivity(new Intent(this, MainActivity.class));
}
private void SavePreferences(String key, String value) {
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(key, value);
editor.commit();
}
public class Progress extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_progress);
SharedPreferences sharedPreferences = getPreferences(Context.MODE_PRIVATE);
String test = sharedPreferences.getString("name", "");
String test2 = sharedPreferences.getString("current", "");
TextView testy = (TextView) findViewById(R.id.textView1);
testy.setText(test);
TextView testz = (TextView) findViewById(R.id.test2);
testz.setText(test2);
}
With the code you have you are limiting the access of sharedpreferences to activity(context) level.
Values saved in activity Activity MainActivity will not be available in activity Progress since you are using getPreferences(MODE_PRIVATE);
Change this to
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
or
SharedPreferences preferences = getSharedPreferences(PREF_FILE_NAME, MODE_PRIVATE);
getPreferences:
public SharedPreferences getPreferences (int mode)
Retrieve a SharedPreferences object for accessing preferences that are private to this activity.
Related
I have a situation where there is a TextView in MainActivity with some textual content. However, when I go from MainActivity to SecondActivity and return to MainActivity again, the text contained in TextView is lost. I tried to solve this with the help of SharedPreferences and I wrote the code. SharedPreferences does not save when I return from SecondActivity. I really do not see where I am making a problem in this code and I ask your help.
private void SavePreferences(String key, String value){
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(key, value);
editor.apply();
}
private void LoadPreferences()
{
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
String textstorage = sharedPreferences.getString("TEXT", "");
mytext.setText(textstorage);
}
You should call LoadPreferences() in onResume() because onCreate() won't be called when you return back from Second Activity
#Override
protected void onResume() {
super.onResume();
LoadPreferences();
}
you need to give name to your preference try below code:SharedPreferences.Editor editor = getSharedPreferences(PREF_NAME, PRIVATE_MODE).edit()
editor.putString(key, value);
editor.apply();
editor.commit(); // you can omit this, i use this one
and to get it back SharedPreferences sharedPreferences = getSharedPreferences(PREF_NAME, PRIVATE_MODE);
String textstorage = sharedPreferences.getString(key, "default value"); // default value will be alternate value if you string is not found
mytext.setText(textstorage);
How can I store already existing string value in SharedPreferences on button click? I have a TextView and a button: the TextView contains certain string and I want to store that in SharedPreferences on button click.
To write it:
button.setOnClickListener(new View.OnClickListener()
{
#Override
public void onClick(View v)
{
SharedPreferences sharedPref = getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putString("Yourkey", textView.getText()+"");
editor.commit();
}
});
And to read it:
SharedPreferences sharedPref = getPreferences(Context.MODE_PRIVATE);
String string = sharedPref.getString("Yourkey","default");
Here are methods which I use everytime to store data in shared-preferences:
private SharedPreferences app_prefs;
private final String DEVICE_TOKEN = "device_token";
public PreferenceHelper(Context context) {
app_prefs = context.getSharedPreferences(AndyConstants.PREF_NAME,
Context.MODE_PRIVATE);
this.context = context;
}
public void putDeviceToken(String deviceToken) {
Editor edit = app_prefs.edit();
edit.putString(DEVICE_TOKEN, deviceToken);
edit.commit();
}
public String getDeviceToken() {
return app_prefs.getString(DEVICE_TOKEN, null);
}
In the first method I create the shared-preferances object, in the second method I use it to put data and in third method to get data any where you need.
I'm trying to save a high score in my app by using SharedPreferences. Everything works fine except for line 16 "score". I'm not sure the best way to fix this issue. Any help is appreciated.
public class MainActivity extends Activity implements OnClickListener {
TextView textView1;
EditText editText1;
Button button1;
int counter = 0;
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
setContentView(R.layout.main);
SharedPreferences prefs = this.getSharedPreferences("myPrefsKey", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
editor.putInt("key", score);
editor.commit();
String score = (Integer.toString(counter));
textView1 = (TextView)findViewById(R.id.textView1);
editText1 = (EditText)findViewById(R.id.editText1);
button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(this);}
public void onClick(View v) {
if (v == button1){
counter++;
editText1.setText(Integer.toString(counter));
}
}
}
It looks like this example: Write to Shared Preferences
SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putInt(getString(R.string.saved_high_score), newHighScore);
editor.commit();
Are you really adding an int? What is the error?
You are not initialising the score var. Try this:
SharedPreferences prefs = this.getSharedPreferences("myPrefsKey", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = prefs.edit();
editor.putInt("key", counter);
editor.commit();
BUT, this is wrong since you will only write the value 0 on each activity create call. Put the above code in a method so that you can call it at appropriate times.
I have a login page that saves username and password to SharedPreferences. I have another Activity class that includes a logout button. I want to clear SharedPreferences when I click the logout button. The problem is that I don't get the SharedPreferences from this class. How can I get the SharedPreferences?
LoginPage
public class MainActivity extends Activity {
public SharedPreferences.Editor loginPrefsEditor;
public SharedPreferences loginPreferences;
private Boolean saveLogin;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
name = (EditText) findViewById(R.id.et_Username);
pass = (EditText) findViewById(R.id.et_Password);
login = (Button) findViewById(R.id.bt_Login);
loginPreferences = getSharedPreferences("loginPrefs", MODE_PRIVATE);
loginPrefsEditor = loginPreferences.edit();
saveLogin = loginPreferences.getBoolean("saveLogin", false);
if (saveLogin == true) {
name.setText(loginPreferences.getString("username", ""));
pass.setText(loginPreferences.getString("password", ""));
}
login.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v) {
name1 = name.getText().toString();
pass1 = pass.getText().toString();
//new Thread (new Task()).start();
loginPrefsEditor.putBoolean("saveLogin", true);
loginPrefsEditor.putString("username", name1);
loginPrefsEditor.putString("password", pass1);
loginPrefsEditor.commit();
new myAsyncTask().execute();
}
});
}
Logout Button in AnotherActivity
logout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// Launching News Feed Screen
Intent i = new Intent(getApplicationContext(), MainActivity.class);
startActivity(i);
}
});
Try this !
logout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// Launching News Feed Screen
SharedPreferences preferences =getSharedPreferences("loginPrefs",Context.MODE_PRIVATE);
SharedPreferences.Editor editor = preferences.edit();
editor.clear();
editor.apply();
finish();
});
I think you have a trouble in understanding Shared preferences in android .
According to official documentation
To get a SharedPreferences object for your application, use one of two
methods:
getSharedPreferences() - Use this if you need multiple preferences
files identified by name, which you specify with the first parameter.
getPreferences() - Use this if you need only one preferences file for
your Activity. Because this will be the only preferences file for your
Activity, you don't supply a name.
You should have a Context for using both the above methods .
Also Shared preferences are stored asa key value pair , so clearing should mean that you set the values to some empty string.
For more details , and better explanation you can read here http://developer.android.com/guide/topics/data/data-storage.html#pref
and http://www.vogella.com/tutorials/AndroidFileBasedPersistence/article.html
Hope this will help.
Cheers!
It as Simple. Like you save your data in SharedPrefernce
SharedPreferences sp = getSharedPreferences("MYKEY",0);
SharedPreferences.Editor editor = sp.edit();
editor.putString("username" , username);
editor.putString("password" , password);
Now you can retrieve as in any class of your app like,
SharedPreferences sp = getSharedPreferences("MYKEY",0);
String uname = sp.getString("username");
String pwd = sp.getString("password");
And for clear your username and password
editor.clear();
editor.commit();
or
editor.remove("username");
editor.remove("password");
editor.commit();
Why not write a SharedPreference utility class. This can be accessed from both the activities.
SharedPreferences mPrefs = PreferenceManager.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = mPrefs.edit();
editor.clear();
editor.commit();
In Kotlin you can use this code to clear the sharedpreference data
private val sharedPref = "sharedpreference"
val sharedPreferences: SharedPreferences = context.getSharedPreferences(sharedPref, Context.MODE_PRIVATE)
val editor = sharedPreferences.edit()
editor.clear()
editor.apply()
SharedPreferences preferences =getSharedPreferences("loginPrefs",Context.MODE_PRIVATE);
SharedPreferences.Editor editor = preferences.edit();
editor.clear();
editor.apply();
finish();
I'm creating a Quiz App, I ask some questions and give options in the form of radio buttons, now I want to store value of of answer (plus on right answer and minus on wrong one) in SharedPreferences and show that result in other activity. I have searched and found this answer here
I used that but still I'm unable to get my desired results
My code Looks Like :
Main Activity which saves some value in SharedPreferences:
public class MainActivity extends Activity {
private SharedPreferences saveScore;
private SharedPreferences.Editor editor;
RadioGroup group;
RadioButton radioButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
group = (RadioGroup) findViewById(R.id.radioGroup1);
radioButton = (RadioButton) group.findViewById(group.getCheckedRadioButtonId());
saveScore = getPreferences(MODE_PRIVATE);
}
public void gotoNextAndSaveScore(View view) {
if(group.getCheckedRadioButtonId() != R.id.radio3){
editor = saveScore.edit();
editor.putInt("score", -1);
editor.commit();
}else{
editor = saveScore.edit();
editor.putInt("score", 1);
editor.commit();
}
Intent intent = new Intent (MainActivity.this, NextActivity.class);
startActivity(intent);
}}
this is the Next Activity which tries to get values from SharedPreferences:
public class NextActivity extends Activity{
private SharedPreferences preferences;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_next);
preferences = this.getSharedPreferences("score", MODE_WORLD_WRITEABLE);
int value = preferences.getInt("score", 0);
String score = "Your Score is : " + value;
UIHelper.displayScore(this, R.id.tvScore, score );
}}
does any one know how to that?
You should change the line
saveScore = getPreferences(MODE_PRIVATE);
To
saveScore = getSharedPreferences("score",Context.MODE_PRIVATE);
Store the value when navigating to nextActivity during onPause() as below:
#Override
protected void onPause()
{
super.onPause();
// Store values between instances here
SharedPreferences preferences = getSharedPreferences("sharedPrefs", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = preferences.edit();
editor.putString("YourStringKeyValue", "StringValue"); // value to store
// Commit to storage
editor.commit();
}
and get the data with that key in next Activity's onCreate as below:
SharedPreferences preferences = getSharedPreferences("sharedPrefs", 0);
String name= preferences.getString("YourStringKeyValue","");
try this,
public class DataStorage {
private static String KEY;
public static SharedPreferences savedSession;
public void saveID(Context context, String msessionid) {
// TODO Auto-generated method stub
Editor editor = context
.getSharedPreferences(KEY, Activity.MODE_PRIVATE).edit();
editor.putString("SESSION_UID", msessionid);
editor.commit();
}
public String getID(Context context) {
savedSession = context.getSharedPreferences(KEY, Activity.MODE_PRIVATE);
return savedSession.getString("SESSION_UID", "");
}
}
Edit:
DataStorage mdata = new DataStorage();
public void gotoNextAndSaveScore(View view) {
if(group.getCheckedRadioButtonId() != R.id.radio3){
mdata.saveId(Mainactivity.this,1);
}else{
mdata.saveId(Mainactivity.this,-1);
}
And then get value from NextActivity.
DataStorage mdata = new DataStorage();
mdata.getId(NextActivity.this);
You're using the wrong preference file, the getPreference function on Activity returns a file private to that Activity. You need to use the named file version- getSharedPreferences(name, mode)