Simplfy TagManager with shortcut

TagManagerUtils.java

/**
 * Copyright 2013 Omar Miatello - omar.miatello@justonetouch.it
 *
 * 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 it.justonetouch.utils.tagmanager;

import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.util.Log;

import com.google.tagmanager.Container;
import com.google.tagmanager.ContainerOpener;
import com.google.tagmanager.TagManager;
import it.justonetouch.demo.BuildConfig;

/**
 * Singleton to hold the GTM Container (since it should be only created once
 * per run of the app).
 */
public class TagManagerUtils {
    public static final String LOG_TAG = TagManagerUtils.class.getSimpleName();
    private static Container container;
    private static ContainerOpener.ContainerFuture containerFuture;

    /**
     * Utility class: don't instantiate.
     */
    private TagManagerUtils() {}

    public static String getContainerId(Context context) {
        try {
            ApplicationInfo ai = context.getPackageManager().getApplicationInfo(context.getPackageName(), PackageManager.GET_META_DATA);
            String CONTAINER_ID = ai.metaData.getString("com.google.android.tagmanager.CONTAINER_ID");
            if (CONTAINER_ID != null) return CONTAINER_ID;
        } catch (PackageManager.NameNotFoundException e) { // PackageManager.GET_META_DATA not exist
            throw new RuntimeException(e); // Never throw (maybe)
        }
        Log.e(LOG_TAG, "Missing manifest.xml config in <application>: <meta-data android:name=\"com.google.android.tagmanager.CONTAINER_ID\" android:value=\"GTM-xxx\"></meta-data>");
        return null;
    }

    public static ContainerOpener.ContainerFuture startSyncContainerRequest(Context context) {
        return startSyncContainerRequest(context, ContainerOpener.OpenType.PREFER_NON_DEFAULT, ContainerOpener.DEFAULT_TIMEOUT_IN_MILLIS);
    }

    public static ContainerOpener.ContainerFuture startSyncContainerRequest(Context context, ContainerOpener.OpenType openType, Long time) {
        containerFuture = ContainerOpener.openContainer(_getTagManager(context), getContainerId(context), openType, time);
        return containerFuture;
    }

    public static void asyncContainer(Context context, ContainerOpener.OpenType openType, Long time, final ContainerOpener.Notifier callback) {
        ContainerOpener.openContainer(_getTagManager(context), getContainerId(context), openType, time, new ContainerOpener.Notifier() {
            @Override
            public void containerAvailable(Container container) {
                _setContainer(container);
                TagManagerUtils.container = container;
                if (container != null) callback.containerAvailable(container);
            }
        });
    }

    private static TagManager _getTagManager(Context context) {
        TagManager tagManager = TagManager.getInstance(context);
        return tagManager;
    }

    public static void asyncContainer(Context context, final ContainerOpener.Notifier callback) {
        asyncContainer(context, ContainerOpener.OpenType.PREFER_NON_DEFAULT, ContainerOpener.DEFAULT_TIMEOUT_IN_MILLIS, callback);
    }

    public static boolean hasContainer() {
        return container != null;
    }

    public static Container getContainer(Context context) {
        if (!hasContainer()) {
            if (containerFuture == null) {
                startSyncContainerRequest(context);
            }
            _setContainer(containerFuture.get());
            containerFuture = null;
        }
        return container;
    }

    private static void _setContainer(Container c) {
        if (BuildConfig.DEBUG) {
            Log.d(LOG_TAG, "Force refresh if BuildConfig.DEBUG = true");
            c.refresh();
        }
        container = c;
    }
}

TagManagerUtilsAndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="it.justonetouch.demo"
    android:versionCode="1"
    android:versionName="1.0" >

    <!-- TODO: The following permission is required to use all remote service. -->
    <uses-permission android:name="android.permission.INTERNET" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/Theme.Example" >
        
        <!-- TODO: INSERT CONTAINER_ID -->
        <meta-data
            android:name="com.google.android.tagmanager.CONTAINER_ID"
            android:value="GTM-XXXXX-INSERT-CODE-HERE" />
            
        <!-- Add activity / provider / service here. -->
        
        
    </application>
</manifest>

TagManagerUtilsExample.java

import it.justonetouch.utils.tagmanager.TagManagerUtils;

class RssRequestExampleWithTagManagerUtils {
    private static final String MY_COLOR = "mycolor";
    
    private void getColor() {
        Log.i(TAG, "Looking for " + MY_COLOR);
        Container container = TagManagerUtils.getContainer(getContext());
        String my_color = container.getString(MY_COLOR);
        Log.i(TAG, "Retriving color: " + my_color);
    }
}