I am developing an android app. If I press a back button the state of my application should be saved .What should i use to save the state ..am confused with all of these onPause()
,onResume()
, or onRestoresavedInstance()
??? which of these should i use to save the state of my application?? For eg when i press exit button my entire app should exit i have used finish() ?
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
s1=(Button)findViewById(R.id.sn1);
s1.setOnClickListener(this);
LoadPreferences();
s1.setEnabled(false);
}
public void SavePreferences()
{
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putBoolean("state", s1.isEnabled());
}
public void LoadPreferences()
{
System.out.println("LoadPrefe");
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
Boolean state = sharedPreferences.getBoolean("state", false);
s1.setEnabled(state);
}
@Override
public void onBackPressed()
{
System.out.println("backbutton");
SavePreferences();
super.onBackPressed();
}
Depending on the user's Android device, this button might be a physical button or a software button. Android maintains a back stack of destinations as the user navigates throughout your application. This usually allows Android to properly navigate to previous destinations when the Back button is pressed.
In order to check when the 'BACK' button is pressed, use onBackPressed() method from the Android library. Next, perform a check to see if the 'BACK' button is pressed again within 2 seconds and will close the app if it is so. Otherwise, don't exit. Here's how the MainActivity.
The savedInstanceState is a reference to a Bundle object that is passed into the onCreate method of every Android Activity. Activities have the ability, under special circumstances, to restore themselves to a previous state using the data stored in this bundle.
What you have to do is, instead of using KeyCode Back, you have override the below method in your Activity,
@Override
public void onBackPressed() {
super.onBackPressed();
}
And save the state of your Button using SharedPrefrence, and next time when you enter your Activity get the value from the Sharedpreference and set the enabled state of your button accordingly.
Example,
private void SavePreferences(){
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putBoolean("state", button.isEnabled());
editor.commit(); // I missed to save the data to preference here,.
}
private void LoadPreferences(){
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
Boolean state = sharedPreferences.getBoolean("state", false);
button.setEnabled(state);
}
@Override
public void onBackPressed() {
SavePreferences();
super.onBackPressed();
}
onCreate(Bundle savedInstanceState)
{
//just a rough sketch of where you should load the data
LoadPreferences();
}
you can use this way
public void onBackPressed() {
// Save settings here
};
Called when the activity has detected the user's press of the back key. The default implementation simply finishes the current activity, but you can override this to do whatever you want.
save your application state in this method.
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