michael@0: /*
michael@0:  * Copyright (C) 2013 The Android Open Source Project
michael@0:  *
michael@0:  * Licensed under the Apache License, Version 2.0 (the "License");
michael@0:  * you may not use this file except in compliance with the License.
michael@0:  * You may obtain a copy of the License at
michael@0:  *
michael@0:  *      http://www.apache.org/licenses/LICENSE-2.0
michael@0:  *
michael@0:  * Unless required by applicable law or agreed to in writing, software
michael@0:  * distributed under the License is distributed on an "AS IS" BASIS,
michael@0:  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
michael@0:  * See the License for the specific language governing permissions and
michael@0:  * limitations under the License.
michael@0:  */
michael@0: 
michael@0: package org.mozilla.gecko.background.preferences;
michael@0: 
michael@0: import java.lang.reflect.Constructor;
michael@0: import java.lang.reflect.Field;
michael@0: import java.lang.reflect.InvocationHandler;
michael@0: import java.lang.reflect.Method;
michael@0: import java.lang.reflect.Proxy;
michael@0: 
michael@0: import android.app.Activity;
michael@0: import android.content.Context;
michael@0: import android.content.Intent;
michael@0: import android.preference.Preference;
michael@0: import android.preference.PreferenceManager;
michael@0: import android.preference.PreferenceScreen;
michael@0: import android.util.Log;
michael@0: 
michael@0: public class PreferenceManagerCompat {
michael@0: 
michael@0: 	private static final String TAG = PreferenceManagerCompat.class.getSimpleName();
michael@0: 
michael@0:     /**
michael@0:      * Interface definition for a callback to be invoked when a
michael@0:      * {@link Preference} in the hierarchy rooted at this {@link PreferenceScreen} is
michael@0:      * clicked.
michael@0:      */
michael@0:     interface OnPreferenceTreeClickListener {
michael@0:         /**
michael@0:          * Called when a preference in the tree rooted at this
michael@0:          * {@link PreferenceScreen} has been clicked.
michael@0:          *
michael@0:          * @param preferenceScreen The {@link PreferenceScreen} that the
michael@0:          *        preference is located in.
michael@0:          * @param preference The preference that was clicked.
michael@0:          * @return Whether the click was handled.
michael@0:          */
michael@0:         boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference);
michael@0:     }
michael@0: 
michael@0: 	static PreferenceManager newInstance(Activity activity, int firstRequestCode) {
michael@0: 		try {
michael@0: 			Constructor<PreferenceManager> c = PreferenceManager.class.getDeclaredConstructor(Activity.class, int.class);
michael@0: 			c.setAccessible(true);
michael@0: 			return c.newInstance(activity, firstRequestCode);
michael@0: 		} catch (Exception e) {
michael@0: 			Log.w(TAG, "Couldn't call constructor PreferenceManager by reflection", e);
michael@0: 		}
michael@0: 		return null;
michael@0: 	}
michael@0: 
michael@0: 	/**
michael@0:      * Sets the owning preference fragment
michael@0:      */
michael@0:     static void setFragment(PreferenceManager manager, PreferenceFragment fragment) {
michael@0: 	// stub
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * Sets the callback to be invoked when a {@link Preference} in the
michael@0:      * hierarchy rooted at this {@link PreferenceManager} is clicked.
michael@0:      *
michael@0:      * @param listener The callback to be invoked.
michael@0:      */
michael@0: 	static void setOnPreferenceTreeClickListener(PreferenceManager manager, final OnPreferenceTreeClickListener listener) {
michael@0: 		try {
michael@0: 			Field onPreferenceTreeClickListener = PreferenceManager.class.getDeclaredField("mOnPreferenceTreeClickListener");
michael@0: 			onPreferenceTreeClickListener.setAccessible(true);
michael@0: 			if (listener != null) {
michael@0: 				Object proxy = Proxy.newProxyInstance(
michael@0: 						onPreferenceTreeClickListener.getType().getClassLoader(),
michael@0: 						new Class<?>[] { onPreferenceTreeClickListener.getType() },
michael@0: 						new InvocationHandler() {
michael@0: 					@Override
michael@0:           public Object invoke(Object proxy, Method method, Object[] args) {
michael@0: 						if (method.getName().equals("onPreferenceTreeClick")) {
michael@0: 							return Boolean.valueOf(listener.onPreferenceTreeClick((PreferenceScreen) args[0], (Preference) args[1]));
michael@0: 						} else {
michael@0: 							return null;
michael@0: 						}
michael@0: 					}
michael@0: 				});
michael@0: 				onPreferenceTreeClickListener.set(manager, proxy);
michael@0: 			} else {
michael@0: 				onPreferenceTreeClickListener.set(manager, null);
michael@0: 			}
michael@0: 		} catch (Exception e) {
michael@0: 			Log.w(TAG, "Couldn't set PreferenceManager.mOnPreferenceTreeClickListener by reflection", e);
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	/**
michael@0:      * Inflates a preference hierarchy from the preference hierarchies of
michael@0:      * {@link Activity Activities} that match the given {@link Intent}. An
michael@0:      * {@link Activity} defines its preference hierarchy with meta-data using
michael@0:      * the {@link #METADATA_KEY_PREFERENCES} key.
michael@0:      * <p>
michael@0:      * If a preference hierarchy is given, the new preference hierarchies will
michael@0:      * be merged in.
michael@0:      *
michael@0:      * @param queryIntent The intent to match activities.
michael@0:      * @param rootPreferences Optional existing hierarchy to merge the new
michael@0:      *            hierarchies into.
michael@0:      * @return The root hierarchy (if one was not provided, the new hierarchy's
michael@0:      *         root).
michael@0:      */
michael@0: 	static PreferenceScreen inflateFromIntent(PreferenceManager manager, Intent intent, PreferenceScreen screen) {
michael@0: 		try {
michael@0:             Method m = PreferenceManager.class.getDeclaredMethod("inflateFromIntent", Intent.class, PreferenceScreen.class);
michael@0:             m.setAccessible(true);
michael@0:             PreferenceScreen prefScreen = (PreferenceScreen) m.invoke(manager, intent, screen);
michael@0:             return prefScreen;
michael@0:         } catch (Exception e) {
michael@0: 			Log.w(TAG, "Couldn't call PreferenceManager.inflateFromIntent by reflection", e);
michael@0: 		}
michael@0: 		return null;
michael@0: 	}
michael@0: 
michael@0: 	/**
michael@0:      * Inflates a preference hierarchy from XML. If a preference hierarchy is
michael@0:      * given, the new preference hierarchies will be merged in.
michael@0:      *
michael@0:      * @param context The context of the resource.
michael@0:      * @param resId The resource ID of the XML to inflate.
michael@0:      * @param rootPreferences Optional existing hierarchy to merge the new
michael@0:      *            hierarchies into.
michael@0:      * @return The root hierarchy (if one was not provided, the new hierarchy's
michael@0:      *         root).
michael@0:      * @hide
michael@0:      */
michael@0: 	static PreferenceScreen inflateFromResource(PreferenceManager manager, Activity activity, int resId, PreferenceScreen screen) {
michael@0: 		try {
michael@0:             Method m = PreferenceManager.class.getDeclaredMethod("inflateFromResource", Context.class, int.class, PreferenceScreen.class);
michael@0:             m.setAccessible(true);
michael@0:             PreferenceScreen prefScreen = (PreferenceScreen) m.invoke(manager, activity, resId, screen);
michael@0:             return prefScreen;
michael@0:         } catch (Exception e) {
michael@0: 			Log.w(TAG, "Couldn't call PreferenceManager.inflateFromResource by reflection", e);
michael@0: 		}
michael@0: 		return null;
michael@0: 	}
michael@0: 
michael@0: 	/**
michael@0:      * Returns the root of the preference hierarchy managed by this class.
michael@0:      *
michael@0:      * @return The {@link PreferenceScreen} object that is at the root of the hierarchy.
michael@0:      */
michael@0: 	static PreferenceScreen getPreferenceScreen(PreferenceManager manager) {
michael@0: 		try {
michael@0:             Method m = PreferenceManager.class.getDeclaredMethod("getPreferenceScreen");
michael@0:             m.setAccessible(true);
michael@0:             return (PreferenceScreen) m.invoke(manager);
michael@0:         } catch (Exception e) {
michael@0: 			Log.w(TAG, "Couldn't call PreferenceManager.getPreferenceScreen by reflection", e);
michael@0: 		}
michael@0: 		return null;
michael@0: 	}
michael@0: 
michael@0: 	/**
michael@0:      * Called by the {@link PreferenceManager} to dispatch a subactivity result.
michael@0:      */
michael@0: 	static void dispatchActivityResult(PreferenceManager manager, int requestCode, int resultCode, Intent data) {
michael@0: 		try {
michael@0:             Method m = PreferenceManager.class.getDeclaredMethod("dispatchActivityResult", int.class, int.class, Intent.class);
michael@0:             m.setAccessible(true);
michael@0:             m.invoke(manager, requestCode, resultCode, data);
michael@0:         } catch (Exception e) {
michael@0: 			Log.w(TAG, "Couldn't call PreferenceManager.dispatchActivityResult by reflection", e);
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	/**
michael@0:      * Called by the {@link PreferenceManager} to dispatch the activity stop
michael@0:      * event.
michael@0:      */
michael@0: 	static void dispatchActivityStop(PreferenceManager manager) {
michael@0: 		try {
michael@0:             Method m = PreferenceManager.class.getDeclaredMethod("dispatchActivityStop");
michael@0:             m.setAccessible(true);
michael@0:             m.invoke(manager);
michael@0:         } catch (Exception e) {
michael@0: 			Log.w(TAG, "Couldn't call PreferenceManager.dispatchActivityStop by reflection", e);
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	/**
michael@0:      * Called by the {@link PreferenceManager} to dispatch the activity destroy
michael@0:      * event.
michael@0:      */
michael@0: 	static void dispatchActivityDestroy(PreferenceManager manager) {
michael@0: 		try {
michael@0: 			Method m = PreferenceManager.class.getDeclaredMethod("dispatchActivityDestroy");
michael@0: 			m.setAccessible(true);
michael@0: 			m.invoke(manager);
michael@0: 		} catch (Exception e) {
michael@0: 			Log.w(TAG, "Couldn't call PreferenceManager.dispatchActivityDestroy by reflection", e);
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	/**
michael@0:      * Sets the root of the preference hierarchy.
michael@0:      *
michael@0:      * @param preferenceScreen The root {@link PreferenceScreen} of the preference hierarchy.
michael@0:      * @return Whether the {@link PreferenceScreen} given is different than the previous.
michael@0:      */
michael@0: 	static boolean setPreferences(PreferenceManager manager, PreferenceScreen screen) {
michael@0: 		try {
michael@0: 			Method m = PreferenceManager.class.getDeclaredMethod("setPreferences", PreferenceScreen.class);
michael@0: 			m.setAccessible(true);
michael@0: 			return ((Boolean) m.invoke(manager, screen));
michael@0: 		} catch (Exception e) {
michael@0: 			Log.w(TAG, "Couldn't call PreferenceManager.setPreferences by reflection", e);
michael@0: 		}
michael@0: 		return false;
michael@0: 	}
michael@0: 
michael@0: }