Make keyboard type show up in preferences list

Show the actual current setting of the preference in the summary.

android/src/com/levien/synthesizer/android/ui/SettingsActivity.java

@@ -1,15 +1,33 @@
 package com.levien.synthesizer.android.ui;
 
 import android.os.Bundle;
+import android.preference.ListPreference;
+import android.preference.Preference;
+import android.preference.Preference.OnPreferenceChangeListener;
 import android.preference.PreferenceActivity;
 
 import com.levien.synthesizer.R;
 
 public class SettingsActivity extends PreferenceActivity {
+  @SuppressWarnings("deprecation")
   @Override
   public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     addPreferencesFromResource(R.xml.preferences);
+    ListPreference keyboardTypePref = (ListPreference)findPreference("keyboard_type");
+    updateListSummary(keyboardTypePref, keyboardTypePref.getValue());
+    keyboardTypePref.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
+      public boolean onPreferenceChange(Preference pref, Object newVal) {
+        updateListSummary(pref, newVal.toString());
+        return true;
+      }
+    });
+  }
+
+  private void updateListSummary(Preference pref, String newVal) {
+    ListPreference lp = (ListPreference)pref;
+    int index = lp.findIndexOfValue(newVal);
+    lp.setSummary(lp.getEntries()[index]);
   }
 }