android - 如何在 android 中删除然后重新初始化 Firebase 应用程序？

Question

我尝试处理两个不同 firebase 项目的两个数据库。为此，我必须首先删除 新初始化的应用程序，然后必须重新初始化 应用程序。为此，我尝试使用但每次都失败了。

FirebaseApp.initializeApp(context, firebaseOptions, "secondary").delete();

应该使用什么来删除辅助初始化的 firebase 应用程序？下面是我的代码:

 boolean hasBeenInitialized = false;
    List<FirebaseApp> firebaseAppList = FirebaseApp.getApps(Charts.this);

    for (FirebaseApp app : firebaseAppList) {

        if (app.getName().equals("secondary")) {
            hasBeenInitialized = true;

        }
    }

    FirebaseOptions firebaseOptions = new FirebaseOptions.Builder()
            .setApiKey(apiKey)
            .setApplicationId(appId)
            .setDatabaseUrl(databaseLink)
            .build();

    if (!hasBeenInitialized) { //false
        firebaseApp = FirebaseApp.initializeApp(Charts.this, firebaseOptions, "secondary");

    } else {
        firebaseApp = FirebaseApp.getInstance("secondary");

        FirebaseApp.initializeApp(Charts.this, firebaseOptions, "secondary").delete();
        firebaseApp = FirebaseApp.initializeApp(Charts.this, firebaseOptions, "secondary");

              }

    secondaryDatabase = FirebaseDatabase.getInstance(firebaseApp);

`

Answer 1

虫虫

在您的代码中，您找到了辅助实例，但随后立即尝试再次初始化它并抛出错误。

firebaseApp = FirebaseApp.getInstance("secondary");
FirebaseApp.initializeApp(Charts.this, firebaseOptions, "secondary").delete(); // throws IllegalStateException

它的固定形式是:

firebaseApp = FirebaseApp.getInstance("secondary");
firebaseApp.delete();

此外，在代码的最后一行，您尝试为 firebaseApp 而不是 "secondary" 的字符串值获取 FirebaseApp

secondaryDatabase = FirebaseDatabase.getInstance(firebaseApp);

固定的来源是:

secondaryDatabase = firebaseApp;
// OR
secondaryDatabase = FirebaseDatabase.getInstance("secondary");

固定代码

根本不将应用程序实例存储为 firebaseApp，只需直接删除/使用该实例即可。

List<FirebaseApp> firebaseAppList = FirebaseApp.getApps(Charts.this);

// Delete "secondary" if it exists
for (FirebaseApp app : firebaseAppList) {
    if (app.getName().equals("secondary")) {
        app.delete(); // found "secondary". Delete it
        break;
    }
}

// Build options object
FirebaseOptions firebaseOptions = new FirebaseOptions.Builder()
        .setApiKey(apiKey)
        .setApplicationId(appId)
        .setDatabaseUrl(databaseLink)
        .build();

// Initialize
secondaryDatabase = FirebaseApp.initializeApp(Charts.this, firebaseOptions, "secondary");

// secondaryDatabase is now a FirebaseApp instance for the secondary database