Java tutorial
package com.sim2dial.dialer.ui; /* PreferencesListFragment.java Copyright (C) 2012 Belledonne Communications, Grenoble, France This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ import java.lang.reflect.Constructor; import java.lang.reflect.Method; import com.sim2dial.dialer.R; import android.annotation.SuppressLint; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.preference.Preference; import android.preference.PreferenceGroup; import android.preference.PreferenceManager; import android.preference.PreferenceScreen; import android.support.v4.app.ListFragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.ViewParent; import android.widget.ListView; import android.widget.RelativeLayout; @SuppressLint("ValidFragment") public class PreferencesListFragment extends ListFragment { private PreferenceManager mPreferenceManager; /** * The starting request code given out to preference framework. */ private static final int FIRST_REQUEST_CODE = 100; private static final int MSG_BIND_PREFERENCES = 0; private Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { switch (msg.what) { case MSG_BIND_PREFERENCES: bindPreferences(); break; } } }; private ListView preferencesList; private int xmlResID; public PreferencesListFragment(int xmlId) { this.xmlResID = xmlId; } // Must be provided public PreferencesListFragment() { } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle b) { // Hack to correctly display preferences View view = inflater.inflate(R.layout.settings, null); ViewParent p = preferencesList.getParent(); if (p != null) { ((ViewGroup) p).removeView(preferencesList); } RelativeLayout layout = (RelativeLayout) view.findViewById(R.id.topLayout); layout.addView(preferencesList); postBindPreferences(); return view; } @Override public void onDestroyView() { super.onDestroyView(); ViewParent p = preferencesList.getParent(); if (p != null) { ((ViewGroup) p).removeView(preferencesList); } } @Override public void onCreate(Bundle bundle) { super.onCreate(bundle); if (bundle != null) { xmlResID = bundle.getInt("xml"); } mPreferenceManager = onCreatePreferenceManager(); preferencesList = (ListView) LayoutInflater.from(getActivity()).inflate(R.layout.preference_list_content, null); preferencesList.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY); addPreferencesFromResource(xmlResID); postBindPreferences(); } @Override public void onStop() { super.onStop(); try { Method m = PreferenceManager.class.getDeclaredMethod("dispatchActivityStop"); m.setAccessible(true); m.invoke(mPreferenceManager); } catch (Exception e) { e.printStackTrace(); } } @Override public void onDestroy() { super.onDestroy(); preferencesList = null; try { Method m = PreferenceManager.class.getDeclaredMethod("dispatchActivityDestroy"); m.setAccessible(true); m.invoke(mPreferenceManager); } catch (Exception e) { e.printStackTrace(); } } @Override public void onSaveInstanceState(Bundle outState) { outState.putInt("xml", xmlResID); super.onSaveInstanceState(outState); } @Override public void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); try { Method m = PreferenceManager.class.getDeclaredMethod("dispatchActivityResult", int.class, int.class, Intent.class); m.setAccessible(true); m.invoke(mPreferenceManager, requestCode, resultCode, data); } catch (Exception e) { e.printStackTrace(); } } /** * Posts a message to bind the preferences to the list view. * <p> * Binding late is preferred as any custom preference types created in * {@link #onCreate(Bundle)} are able to have their views recycled. */ private void postBindPreferences() { if (mHandler.hasMessages(MSG_BIND_PREFERENCES)) return; mHandler.obtainMessage(MSG_BIND_PREFERENCES).sendToTarget(); } private void bindPreferences() { final PreferenceScreen preferenceScreen = getPreferenceScreen(); if (preferenceScreen != null && preferencesList != null) { preferenceScreen.bind(preferencesList); } } /** * Creates the {@link PreferenceManager}. * * @return The {@link PreferenceManager} used by this activity. */ private PreferenceManager onCreatePreferenceManager() { try { Constructor<PreferenceManager> c = PreferenceManager.class.getDeclaredConstructor(Activity.class, int.class); c.setAccessible(true); PreferenceManager preferenceManager = c.newInstance(this.getActivity(), FIRST_REQUEST_CODE); return preferenceManager; } catch (Exception e) { e.printStackTrace(); return null; } } /** * Returns the {@link PreferenceManager} used by this activity. * @return The {@link PreferenceManager}. */ public PreferenceManager getPreferenceManager() { return mPreferenceManager; } /** * Sets the root of the preference hierarchy that this activity is showing. * * @param preferenceScreen The root {@link PreferenceScreen} of the preference hierarchy. */ public void setPreferenceScreen(PreferenceScreen preferenceScreen) { try { Method m = PreferenceManager.class.getDeclaredMethod("setPreferences", PreferenceScreen.class); m.setAccessible(true); boolean result = (Boolean) m.invoke(mPreferenceManager, preferenceScreen); if (result && preferenceScreen != null) { postBindPreferences(); } } catch (Exception e) { e.printStackTrace(); } } /** * Gets the root of the preference hierarchy that this activity is showing. * * @return The {@link PreferenceScreen} that is the root of the preference * hierarchy. */ public PreferenceScreen getPreferenceScreen() { try { Method m = PreferenceManager.class.getDeclaredMethod("getPreferenceScreen"); m.setAccessible(true); return (PreferenceScreen) m.invoke(mPreferenceManager); } catch (Exception e) { e.printStackTrace(); } return null; } /** * Inflates the given XML resource and adds the preference hierarchy to the current * preference hierarchy. * * @param preferencesResId The XML resource ID to inflate. */ public void addPreferencesFromResource(int preferencesResId) { try { Method m = PreferenceManager.class.getDeclaredMethod("inflateFromResource", Context.class, int.class, PreferenceScreen.class); m.setAccessible(true); PreferenceScreen prefScreen = (PreferenceScreen) m.invoke(mPreferenceManager, getActivity(), preferencesResId, getPreferenceScreen()); setPreferenceScreen(prefScreen); } catch (Exception e) { e.printStackTrace(); } } /** * Finds a {@link Preference} based on its key. * * @param key The key of the preference to retrieve. * @return The {@link Preference} with the key, or null. * @see PreferenceGroup#findPreference(CharSequence) */ public Preference findPreference(CharSequence key) { if (mPreferenceManager == null) { return null; } return mPreferenceManager.findPreference(key); } }