I'm new to Android programming and I've never dabbled in saving values or settings before. I've taken a look at Storage Options and I've tried to Implement SharedPreferences. And from my point of view, when I create a new event, I tell it to pull some data, and set a TextView to the value. However it never sets the TextView; and I can't seem to figure out what is wrong.
createEvent This is where I'm creating the values I want to stored.
@Override
protected void onCreate(Bundle savedInstanceState) {
LayoutInflater inflater = this.getLayoutInflater();
final View vView = inflater.inflate(R.layout.fragment_main, null);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mNavigationDrawerFragment = (NavigationDrawerFragment)
getFragmentManager().findFragmentById(R.id.navigation_drawer);
mTitle = getTitle();
// Set up the drawer.
mNavigationDrawerFragment.setUp(
R.id.navigation_drawer,
(DrawerLayout) findViewById(R.id.drawer_layout));
SharedPreferences settings = getPreferences(0);
int iEventCounter = settings.getInt("eventCounter", 0);
if (iEventCounter > 0){
String eventName1 = settings.getString("event1Name", "Name of Event");
TextView eventLabelName = (TextView)vView.findViewById(R.id.section_label);
eventLabelName.setText(eventName1);
}
else if (iEventCounter == 0 || iEventCounter < 0){
TextView eventLabelName = (TextView)vView.findViewById(R.id.section_label);
eventLabelName.setText("There is no event stored in memory.");
}
}
eventAdd (Here is where I commit data to SharedPreferences
public int eventAdd(String sName, String sDate) {
LayoutInflater inflater = this.getLayoutInflater();
final View vView = inflater.inflate(R.layout.fragment_main, null);
TextView eventLabelName = (TextView)vView.findViewById(R.id.testTextView);
eventLabelName.setText("test"); //Never changes
SharedPreferences settings = getPreferences(0); //Create SharedPreferences
SharedPreferences.Editor editor = settings.edit(); //Create editor
iEventCounter = settings.getInt("eventCounter", 0);
iEventCounter = iEventCounter+1;
editor.putInt("eventCounter", iEventCounter); //Put values for first Event into SharedPreferences
editor.putString("event1Name", sName);
editor.putString("event1Date", sDate);
// Commit the edits!
editor.commit();
//Change Label based on number of Events thus far.
if (iEventCounter > 0){
String eventName1 = settings.getString("event1Name", "Name of Event");
eventLabelName.setText(eventName1);
}
else if (iEventCounter == 0 || iEventCounter < 0){
eventLabelName.setText("There is no event stored in memory.");
}
return iEventCounter;
//eventLabelName.setText(iEventCounter); Doesn't do anything, doesn't change Text.
}
I don't get an error, the app doesn't crash, it just doesn't work. Can anyone see anything wrong here? Any help would be greatly appreciated.
You are inflating a view but not setting it to activity's content. So you don't see any change .
final View vView = inflater.inflate(R.layout.fragment_main, null);
setContentView(R.layout.activity_main);
Maybe you should use;
setContentView(mView);
Or if you want to set activity_main
to your activity's content, change;
vView.findViewById
to
findViewById
Try to refactor your code. There are some unnecessary codes.
Try changing
SharedPreferences settings = getPreferences(0);
in both methods to
SharedPreferences settings = getSharedPreferences("preferenceName", 0);
Your code is kinda strange at some points.
In the first place, you could turn this code
SharedPreferences settings = getPreferences(0);
int iEventCounter = settings.getInt("eventCounter", 0);
if (iEventCounter > 0){
String eventName1 = settings.getString("event1Name", "Name of Event");
TextView eventLabelName = (TextView)vView.findViewById(R.id.section_label);
eventLabelName.setText(eventName1);
}
else if (iEventCounter == 0 || iEventCounter < 0){
TextView eventLabelName = (TextView)vView.findViewById(R.id.section_label);
eventLabelName.setText("There is no event stored in memory.");
}
into the next one:
SharedPreferences settings = getSharedPreferences("preferences", MODE_PRIVATE); //Always use the name of the variable to know its meaning.
int iEventCounter = settings.getInt("eventCounter", 0);
if (iEventCounter > 0){
String eventName1 = settings.getString("event1Name", "Name of Event");
TextView eventLabelName = (TextView)vView.findViewById(R.id.section_label);
eventLabelName.setText(eventName1);
}
else { // We know what the other cases are, more readable
TextView eventLabelName = (TextView)vView.findViewById(R.id.section_label);
eventLabelName.setText("There is no event stored in memory.");
}
and this other piece:
SharedPreferences settings = getPreferences(0); //Create SharedPreferences
SharedPreferences.Editor editor = settings.edit(); //Create editor
iEventCounter = settings.getInt("eventCounter", 0);
iEventCounter = iEventCounter+1;
editor.putInt("eventCounter", iEventCounter); //Put values for first Event into SharedPreferences
editor.putString("event1Name", sName);
editor.putString("event1Date", sDate);
// Commit the edits!
editor.commit();
//Change Label based on number of Events thus far.
if (iEventCounter > 0){
String eventName1 = settings.getString("event1Name", "Name of Event");
eventLabelName.setText(eventName1);
}
else if (iEventCounter == 0 || iEventCounter < 0){
eventLabelName.setText("There is no event stored in memory.");
into this piece:
SharedPreferences settings = getSharedPreferences("preferences", MODE_PRIVATE); //Same as before
iEventCounter = settings.getInt("eventCounter", 0); // We first get the value, then we edit
SharedPreferences.Editor editor = settings.edit(); //Create editor
editor.putInt("eventCounter", ++iEventCounter); //Pre-increment first increments the variable value then does whatever you wanted to.
editor.putString("event1Name", sName);
editor.putString("event1Date", sDate);
// Commit the edits!
editor.commit();
//Change Label based on number of Events thus far.
if (iEventCounter > 0){
String eventName1 = settings.getString("event1Name", "Name of Event");
eventLabelName.setText(eventName1);
}
else { // Same as before
eventLabelName.setText("There is no event stored in memory.");
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