Android example source code file (PreferenceInflater.java)

This example Android source code file (PreferenceInflater.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

android, attributeset, content, context, could, genericinflater, intent, intent_tag_name, io, ioexception, override, preferencegroup, preferenceinflater, preferencemanager, string, util, utilities, utils, xmlpullparserexception

The PreferenceInflater.java Android example source code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.preference;

import java.io.IOException;
import java.util.Map;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import android.app.AliasActivity;
import android.content.Context;
import android.content.Intent;
import android.util.AttributeSet;
import android.util.Log;

/**
 * The {@link PreferenceInflater} is used to inflate preference hierarchies from
 * XML files.
 * <p>
 * Do not construct this directly, instead use
 * {@link Context#getSystemService(String)} with
 * {@link Context#PREFERENCE_INFLATER_SERVICE}.
 */
class PreferenceInflater extends GenericInflater<Preference, PreferenceGroup> {
    private static final String TAG = "PreferenceInflater";
    private static final String INTENT_TAG_NAME = "intent";

    private PreferenceManager mPreferenceManager;
    
    public PreferenceInflater(Context context, PreferenceManager preferenceManager) {
        super(context);
        init(preferenceManager);
    }

    PreferenceInflater(GenericInflater<Preference, PreferenceGroup> original, PreferenceManager preferenceManager, Context newContext) {
        super(original, newContext);
        init(preferenceManager);
    }

    @Override
    public GenericInflater<Preference, PreferenceGroup> cloneInContext(Context newContext) {
        return new PreferenceInflater(this, mPreferenceManager, newContext);
    }
    
    private void init(PreferenceManager preferenceManager) {
        mPreferenceManager = preferenceManager;
        setDefaultPackage("android.preference.");
    }

    @Override
    protected boolean onCreateCustomFromTag(XmlPullParser parser, Preference parentPreference,
            AttributeSet attrs) throws XmlPullParserException {
        final String tag = parser.getName();
        
        if (tag.equals(INTENT_TAG_NAME)) {
            Intent intent = null;
            
            try {
                intent = Intent.parseIntent(getContext().getResources(), parser, attrs);
            } catch (IOException e) {
                Log.w(TAG, "Could not parse Intent.");
                Log.w(TAG, e);
            }
            
            if (intent != null) {
                parentPreference.setIntent(intent);
            }
            
            return true;
        }
        
        return false;
    }

    @Override
    protected PreferenceGroup onMergeRoots(PreferenceGroup givenRoot, boolean attachToGivenRoot,
            PreferenceGroup xmlRoot) {
        // If we were given a Preferences, use it as the root (ignoring the root
        // Preferences from the XML file).
        if (givenRoot == null) {
            xmlRoot.onAttachedToHierarchy(mPreferenceManager);
            return xmlRoot;
        } else {
            return givenRoot;
        }
    }
    
}