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POBetter Way To Handle SharedPreferences Changes
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  1. POBetter Way To Handle SharedPreferences Changes
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    copied!<p>I have a project that has two activities (MainActivity and CustomPreferenceActivity). I have some code that when a button is clicked, it launches the CustomPreferenceActivity. Depending on the choices made on the CustomPreferenceActivity, the font color of a TextView will change. However, I don't like my solution to the problem (tying into the onResume to update the UI). Any other suggestions? Thanks in advance.</p> <p>MainActivity</p> <pre><code>public class MainActivity extends Activity { private int colorResId; private int fontSize; private OnClickListener buttonListener = getButtonListener(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button button = (Button)findViewById(R.id.preferenceButton); button.setOnClickListener(buttonListener); } @Override public void onResume() { super.onResume(); updateUiBasedOnPreferences(); } private void updateUiBasedOnPreferences() { SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(this); String colorPreference = pref.getString("colorPreference", "default"); colorResId = convertStringToColorResId(colorPreference); fontSize = pref.getInt("fontSize", 24); TextView textView = (TextView)findViewById(R.id.textView); textView.setTextColor(colorResId); textView.setTextSize(fontSize); } private int convertStringToColorResId(String input) { if (input.equals("GREEN")) return Color.GREEN; else if (input.equals("RED")) return Color.RED; else if (input.equals("BLUE")) return Color.BLUE; else return Color.BLACK; } private OnClickListener getButtonListener() { return new OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(getApplicationContext(), CustomPreferencesActivity.class); startActivity(intent); } }; } </code></pre> <p>CustomPreferencesActivity</p> <pre><code>public class CustomPreferencesActivity extends PreferenceActivity implements OnSharedPreferenceChangeListener { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.preferences); SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext()); pref.registerOnSharedPreferenceChangeListener(this); } @Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { Preference pref = findPreference(key); pref.setSummary(sharedPreferences.getString(key, "")); } } </code></pre>
 

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