173
外匯
Android的ListPreference手動綁定數據
Preference給我們一般設置帶來很多方便，我們隻要稍微設置下XML選項能滿足我們大部分需求，項目中有需求用數據庫的數據填充到ListPreference的彈出數據中，方法如下：
public class EditPreferences extends PreferenceActivity {
public static final String SELECTED_TARGET_KEY = "SelectedTargetKey";
public static final String NO_SELECTION = "0";
private TargetDbAdapter mDbHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setPreferenceScreen(createPreferenceHierarchy());
}
private PreferenceScreen createPreferenceHierarchy() {
PreferenceScreen root = getPreferenceManager().createPreferenceScreen(this);
PreferenceCategory dialogBasedPrefCat = new PreferenceCategory(this);
dialogBasedPrefCat.setTitle(R.string.pref_cat_title);
root.addPreference(dialogBasedPrefCat);
//builds list from DB
mDbHelper = new TargetDbAdapter(this);
mDbHelper.open();
Cursor c = mDbHelper.fetchAllNotes();
startManagingCursor(c);
int count = c.getCount();
CharSequence[] entries = new CharSequence[count];
CharSequence[] entryValues = new CharSequence[count];
c.moveToFirst();
for(int i=0; i<count; i++) {
entries[i] = c.getString(c.getColumnIndexOrThrow(TargetDbAdapter.KEY_TITLE));
entryValues[i] = c.getString(c.getColumnIndexOrThrow(TargetDbAdapter.KEY_ROWID));
c.moveToNext();
}
ListPreference targets = new ListPreference(this);
targets.setEntries(entries);
targets.setEntryValues(entryValues);
targets.setDefaultValue(NO_SELECTION);
targets.setDialogTitle(R.string.pref_dialog_title);
targets.setKey(SELECTED_TARGET_KEY);
targets.setTitle(R.string.pref_title);
targets.setSummary(R.string.pref_summary);
dialogBasedPrefCat.addPreference(targets);
//add other preference screens
return root;
}
}
最後更新：2017-04-03 18:51:50