Firebase dynamic links 核心的思想和接入之

最近因为项目需求，需要接入firebase dynamic links来增加推广渠道和升级用户体验，刚开始对这个深层动态链接是一脸懵逼的，完全不知道它的核心思想和用法，然后就去官方开发者文档里看了之后，终于大概理解了它的核心思想，官方文档面熟的比较详细：https://firebase.google.com/docs/dynamic-links/，我个人描述就是，跨平台，无论web、iOS或者Android都可以通过动态链接来进入到app的对应的页面（前提是已下载了app，如果没下载，一般是设置跳到应用商店）

接入步骤：
1.首先注册并登陆firebase console 控制台，然后创建动态链接

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2.重点一步设置SHA-1 或者SHA-256 (控制台的设置》项目设置》指纹证书)
由于我的google console 里面设置了SHA-1，如果这里也设置SHA-1会报冲突，建议设置SHA-256

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3.控制台的配置配置好后，剩下的就是代码了
注入依赖： compile 'com.google.firebase:firebase-invites:11.0.2'
manifest 里面的配置，记得这个配置在你处理回调的那个类里：

 <activity android:name=".ui.MainActivity">
        <!-- [START link_intent_filter] -->
        <intent-filter android:autoVerify="true">
            <action android:name="android.intent.action.VIEW" />
            <category android:name="android.intent.category.DEFAULT" />
            <category android:name="android.intent.category.BROWSABLE" />

            <data
                android:host="www.quickgame.com"
                android:pathPrefix="/index_dynamic_links"
                android:scheme="https" />
        </intent-filter>
        <!-- [END link_intent_filter] -->
        </activity>

/**
     * firebase dynamic links
     * create and receive
     */
    private void initDynamicLinks() {
        // Create a deep link and display it in the UI
        Uri deepLink = buildDeepLink(Uri.parse(Conf.DEEP_LINK_URL), 0, false);
        // TODO: 2017/9/5 the deepLink should be share
//        shareDeepLink(deepLink.toString()); // 一般是把这个深层链接分享出去
        // [END_EXCLUDE]

        // [START get_deep_link]  // 当用户点击分享出去的深层链接会走这个回调
        FirebaseDynamicLinks.getInstance()
                .getDynamicLink(getIntent())
                .addOnSuccessListener(this, new OnSuccessListener<PendingDynamicLinkData>() {
                    @Override
                    public void onSuccess(PendingDynamicLinkData pendingDynamicLinkData) {
                        // Get deep link from result (may be null if no link is found)
                        Uri deepLink = null;
                        if (pendingDynamicLinkData != null) {
                            deepLink = pendingDynamicLinkData.getLink();
                        }
                        // Handle the deep link. For example, open the linked
                        // content, or apply promotional credit to the user's
                        // account.
                        // ...

                        // [START_EXCLUDE]
                        // Display deep link in the UI
                        if (deepLink != null) {
                            // TODO: 2017/9/5 获取回调后的深层链接并做对应处理（跳转或者其他）
                            showLog("deeplink=====" + deepLink.toString());
                        } else {
                            showLog("getDynamicLink: no link found");
                        }
                        // [END_EXCLUDE]
                    }
                })
                .addOnFailureListener(this, new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        showLog("getDynamicLink:onFailure" + e);
                    }
                });
        // [END get_deep_link]

 /**
     *创建深层链接,用于分享出去或者其他
     * Build a Firebase Dynamic Link.
     * https://firebase.google.com/docs/dynamic-links/android/create#create-a-dynamic-link-from-parameters
     *
     * @param deepLink   the deep link your app will open. This link must be a valid URL and use the
     *                   HTTP or HTTPS scheme.
     * @param minVersion the {@code versionCode} of the minimum version of your app that can open
     *                   the deep link. If the installed app is an older version, the user is taken
     *                   to the Play store to upgrade the app. Pass 0 if you do not
     *                   require a minimum version.
     * @return a {@link Uri} representing a properly formed deep link.
     */
    @VisibleForTesting
    public Uri buildDeepLink(@NonNull Uri deepLink, int minVersion,  boolean isAd) {
        // Get the unique appcode for this app.
        String appCode = getString(R.string.deeplink_app_code);

        // Get this app's package name.
        String packageName = getApplicationContext().getPackageName();

        // Build the link with all required parameters
        Uri.Builder builder = new Uri.Builder()
                .scheme("https")
                .authority(appCode + ".app.goo.gl")
                .path("/")
                .appendQueryParameter("link", deepLink.toString())
                .appendQueryParameter("apn", packageName);

        // If the deep link is used in an advertisement, this value must be set to 1.
        if (isAd) {
            builder.appendQueryParameter("ad", "1");
        }

        // Minimum version is optional.
        if (minVersion > 0) {
            builder.appendQueryParameter("amv", Integer.toString(minVersion));
        }

        return builder.build();
    }

    private void shareDeepLink(String deepLink) {
        Intent intent = new Intent(Intent.ACTION_SEND);
        intent.setType("text/plain");
        intent.putExtra(Intent.EXTRA_SUBJECT, "Firebase Deep Link");
        intent.putExtra(Intent.EXTRA_TEXT, deepLink);
        startActivity(intent);
    }

参考的文章：
https://github.com/firebase/quickstart-android/tree/master/dynamiclinks
http://www.studyjamscn.com/article-18-1.html