Done lesson 3.08

[Sunshine.git] / app / src / main / java / uk / me / njae / sunshine / SettingsActivity.java

diff --git a/app/src/main/java/uk/me/njae/sunshine/SettingsActivity.java b/app/src/main/java/uk/me/njae/sunshine/SettingsActivity.java
new file mode 100644 (file)
index 0000000..5907598
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+++ b/app/src/main/java/uk/me/njae/sunshine/SettingsActivity.java
@@ -0,0 +1,67 @@
+package uk.me.njae.sunshine;
+
+import android.os.Bundle;
+import android.preference.ListPreference;
+import android.preference.Preference;
+import android.preference.PreferenceActivity;
+import android.preference.PreferenceManager;
+
+/**
+ * A {@link PreferenceActivity} that presents a set of application settings.
+ * <p>
+ * See <a href="http://developer.android.com/design/patterns/settings.html">
+ * Android Design: Settings</a> for design guidelines and the <a
+ * href="http://developer.android.com/guide/topics/ui/settings.html">Settings
+ * API Guide</a> for more information on developing a Settings UI.
+ */
+public class SettingsActivity extends PreferenceActivity
+        implements Preference.OnPreferenceChangeListener {
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        // Add 'general' preferences, defined in the XML file
+        addPreferencesFromResource(R.xml.pref_general);
+
+        // For all preferences, attach an OnPreferenceChangeListener so the UI summary can be
+        // updated when the preference changes.
+        bindPreferenceSummaryToValue(findPreference(getString(R.string.pref_location_key)));
+    }
+
+    /**
+     * Attaches a listener so the summary is always updated with the preference value.
+     * Also fires the listener once, to initialize the summary (so it shows up before the value
+     * is changed.)
+     */
+    private void bindPreferenceSummaryToValue(Preference preference) {
+        // Set the listener to watch for value changes.
+        preference.setOnPreferenceChangeListener(this);
+
+        // Trigger the listener immediately with the preference's
+        // current value.
+        onPreferenceChange(preference,
+                PreferenceManager
+                        .getDefaultSharedPreferences(preference.getContext())
+                        .getString(preference.getKey(), ""));
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object value) {
+        String stringValue = value.toString();
+
+        if (preference instanceof ListPreference) {
+            // For list preferences, look up the correct display value in
+            // the preference's 'entries' list (since they have separate labels/values).
+            ListPreference listPreference = (ListPreference) preference;
+            int prefIndex = listPreference.findIndexOfValue(stringValue);
+            if (prefIndex >= 0) {
+                preference.setSummary(listPreference.getEntries()[prefIndex]);
+            }
+        } else {
+            // For other preferences, set the summary to the value's simple string representation.
+            preference.setSummary(stringValue);
+        }
+        return true;
+    }
+
+}
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