dandelion/app/src/main/java/com/github/dfa/diaspora_android/web/custom_tab/CustomTabActivityHelper.java

/*
    This file is part of the dandelion*.

    dandelion* 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 3 of the License, or
    (at your option) any later version.

    dandelion* 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 the dandelion*.

    If not, see <http://www.gnu.org/licenses/>.
 */
package com.github.dfa.diaspora_android.web.custom_tab;

import android.app.Activity;
import android.content.ComponentName;
import android.net.Uri;
import android.os.Bundle;
import android.support.customtabs.CustomTabsClient;
import android.support.customtabs.CustomTabsIntent;
import android.support.customtabs.CustomTabsServiceConnection;
import android.support.customtabs.CustomTabsSession;

import java.util.List;

/**
 * Adapted from https://medium.com/ribot-labs/exploring-chrome-customs-tabs-on-android-ef427effe2f4
 */

public class CustomTabActivityHelper {
    private CustomTabsSession mCustomTabsSession;
    private CustomTabsClient mClient;
    private CustomTabsServiceConnection mConnection;
    private ConnectionCallback mConnectionCallback;

    /**
     * Opens the URL on a Custom Tab if possible. Otherwise fallsback to opening it on a WebView
     *
     * @param activity         The host activity
     * @param customTabsIntent a CustomTabsIntent to be used if Custom Tabs is available
     * @param uri              the Uri to be opened
     * @param fallback         a CustomTabFallback to be used if Custom Tabs is not available
     */
    public static void openCustomTab(Activity activity,
                                     CustomTabsIntent customTabsIntent,
                                     Uri uri,
                                     CustomTabFallback fallback) {
        String packageName = CustomTabsHelper.getPackageNameToUse(activity);

        //If we cant find a package name, it means there's no browser that supports
        //Chrome Custom Tabs installed. So, we fallback to the ui__webview
        if (packageName == null) {
            if (fallback != null) {
                fallback.openUri(activity, uri);
            }
        } else {
            customTabsIntent.intent.setPackage(packageName);
            customTabsIntent.launchUrl(activity, uri);
        }
    }

    /**
     * Unbinds the Activity from the Custom Tabs Service
     *
     * @param activity the activity that is connected to the service
     */
    public void unbindCustomTabsService(Activity activity) {
        if (mConnection == null) return;
        activity.unbindService(mConnection);
        mClient = null;
        mCustomTabsSession = null;
    }

    /**
     * Creates or retrieves an exiting CustomTabsSession
     *
     * @return a CustomTabsSession
     */
    public CustomTabsSession getSession() {
        if (mClient == null) {
            mCustomTabsSession = null;
        } else if (mCustomTabsSession == null) {
            mCustomTabsSession = mClient.newSession(null);
        }
        return mCustomTabsSession;
    }

    /**
     * Register a Callback to be called when connected or disconnected from the Custom Tabs Service
     *
     * @param connectionCallback callback
     */
    public void setConnectionCallback(ConnectionCallback connectionCallback) {
        this.mConnectionCallback = connectionCallback;
    }

    /**
     * Binds the Activity to the Custom Tabs Service
     *
     * @param activity the activity to be binded to the service
     */
    public void bindCustomTabsService(Activity activity) {
        if (mClient != null) return;

        String packageName = CustomTabsHelper.getPackageNameToUse(activity);
        if (packageName == null) return;
        mConnection = new CustomTabsServiceConnection() {
            @Override
            public void onCustomTabsServiceConnected(ComponentName name, CustomTabsClient client) {
                mClient = client;
                mClient.warmup(0L);
                if (mConnectionCallback != null) mConnectionCallback.onCustomTabsConnected();
                //Initialize a session as soon as possible.
                getSession();
            }

            @Override
            public void onServiceDisconnected(ComponentName name) {
                mClient = null;
                if (mConnectionCallback != null) mConnectionCallback.onCustomTabsDisconnected();
            }
        };
        CustomTabsClient.bindCustomTabsService(activity, packageName, mConnection);
    }

    public boolean mayLaunchUrl(Uri uri, Bundle extras, List<Bundle> otherLikelyBundles) {
        if (mClient == null) return false;

        CustomTabsSession session = getSession();
        if (session == null) return false;

        return session.mayLaunchUrl(uri, extras, otherLikelyBundles);
    }

    public boolean warmup(int flags) {
        return mClient.warmup(flags);
    }

    /**
     * A Callback for when the service is connected or disconnected. Use those callbacks to
     * handle UI changes when the service is connected or disconnected
     */
    public interface ConnectionCallback {
        /**
         * Called when the service is connected
         */
        void onCustomTabsConnected();

        /**
         * Called when the service is disconnected
         */
        void onCustomTabsDisconnected();
    }

    /**
     * To be used as a fallback to open the Uri when Custom Tabs is not available
     */
    public interface CustomTabFallback {
        /**
         * @param activity The Activity that wants to open the Uri
         * @param uri      The uri to be opened by the fallback
         */
        void openUri(Activity activity, Uri uri);
    }

}