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    <p>My colleague wrote an article explaining Application State on Android devices including explanations on Activity Lifecycle and State Information, How to Store State Information, and saving to State <code>Bundle</code> and <code>SharedPreferences</code> and <a href="http://www.eigo.co.uk/Managing-State-in-an-Android-Activity.aspx" rel="noreferrer">take a look at here</a>.</p> <p>The article covers three approaches:</p> <h2>Store local varible/UI control data for application lifetime (ie temporarily) using Instance State Bundle</h2> <pre><code>[Code sample – Store State in State Bundle] @Override public void onSaveInstanceState(Bundle savedInstanceState) { // Store UI state to the savedInstanceState. // This bundle will be passed to onCreate on next call. EditText txtName = (EditText)findViewById(R.id.txtName); String strName = txtName.getText().toString(); EditText txtEmail = (EditText)findViewById(R.id.txtEmail); String strEmail = txtEmail.getText().toString(); CheckBox chkTandC = (CheckBox)findViewById(R.id.chkTandC); boolean blnTandC = chkTandC.isChecked(); savedInstanceState.putString(“Name”, strName); savedInstanceState.putString(“Email”, strEmail); savedInstanceState.putBoolean(“TandC”, blnTandC); super.onSaveInstanceState(savedInstanceState); } </code></pre> <h2>Store local varible/UI control data between application instances (ie permanently) using Shared Preferences</h2> <pre><code>[Code sample – Store State in SharedPreferences] @Override protected void onPause() { super.onPause(); // Store values between instances here SharedPreferences preferences = getPreferences(MODE_PRIVATE); SharedPreferences.Editor editor = preferences.edit(); // Put the values from the UI EditText txtName = (EditText)findViewById(R.id.txtName); String strName = txtName.getText().toString(); EditText txtEmail = (EditText)findViewById(R.id.txtEmail); String strEmail = txtEmail.getText().toString(); CheckBox chkTandC = (CheckBox)findViewById(R.id.chkTandC); boolean blnTandC = chkTandC.isChecked(); editor.putString(“Name”, strName); // value to store editor.putString(“Email”, strEmail); // value to store editor.putBoolean(“TandC”, blnTandC); // value to store // Commit to storage editor.commit(); } </code></pre> <h2>Keeping object instances alive in memory between activities within application lifetime using Retained Non-Configuration Instance</h2> <pre><code>[Code sample – store object instance] private cMyClassType moInstanceOfAClass;// Store the instance of an object @Override public Object onRetainNonConfigurationInstance() { if (moInstanceOfAClass != null) // Check that the object exists return(moInstanceOfAClass); return super.onRetainNonConfigurationInstance(); } </code></pre>
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    1. USMartin Belcher - Eigo
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    1. CO@MartinBelcher-Eigo Article says about data in SharedPreferences that "This data is written to the database on the device.." I believe that the data is stored in a file in the app's directory of the file system.
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    2. CO@Tom SharefPrefs data is written to xml file. Is xml a kind of database? I'd say it is ;)
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