Question

在测试期间，我的数据库中有大约30个引号和大约6个用户。

我现在添加了其余的报价。

总数约为2000：

问题： 应用程序加载需要花费很长时间，它会崩溃并转到页面等待应用程序或退出。然后我减少到200个引号，但仍然出现问题（崩溃前可能显示一个引号）

我在做什么？ 我在数据库中引用我的报价，每次有人打开主页时都会得到一个随机报价（不知道每天如何获得一个报价）

引号的JSON片段：

    {
   "Quotes": {
       "1": {
          "Name": "Abbey, Edward",
          "Quote": "In social institutions, the whole is always less than the sum of its parts. There will never be a state as good as its people, or a church worthy of its congregation, or a university equal to its faculty and students."
       },
       "2": {
          "Name": "Adams, George Matthew",
          "Quote": "There is no such thing as a self-made man. We are made up of thousands of others. Everyone who has ever done a kind deed for us, or spoken one word of encouragement to us, has entered into the makeup of our character and our thoughts, as well as our success."
       },
       "3": {
          "Name": "Albani, Emma",
          "Quote": "I had always loved beautiful and artistic things, though before leav"
       },
       "4": {
          "Name": "Borman, Frank",
          "Quote": "Exploration is really the essence of the human spirit."
       },

........等等

我的代码：

private void showQuote(){

    databaseReference = FirebaseDatabase.getInstance().getReference("Quotes");
    databaseReference.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            int count = (int) dataSnapshot.getChildrenCount();
            for(DataSnapshot data: dataSnapshot.getChildren()){
                int rand = new Random().nextInt(count);
                for (int i = 0; i < rand; i++) {
                    String authorName = data.child("Name").getValue().toString();
                    String quoteGiven = data.child("Quote").getValue().toString();
                    name.setText("- " + authorName);
                    quote.setText(quoteGiven);
                }
            }
        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {
            Toast.makeText(MainActivity.this, "Loading Quote failed", Toast.LENGTH_SHORT).show();
        }
    });

}

我的规则：

 {
  "rules": {
    "users": {
      "$uid": {
        ".read": "auth != null && auth.uid == $uid",
        ".write": "auth != null && auth.uid == $uid"
       }
      },
      "Quotes": {
       ".read": true,
        ".write": false
    }
  }
}

我要的是什么？

我希望既可以每天显示报价，也可以随机显示报价。如果我继续随机给出报价，我该怎么做以确保其不会使应用程序过载并崩溃。我希望有很多引号，而不是经常删除和添加新引号。

Answer 1

1。“加载该应用需要很长时间”

您有databaseRef.keepSynced(true);吗？

这将加载所有数据库，因此将花费很长时间

您应该只阅读想要的内容

或者您可以FirebaseDatabase.getInstance().setPersistenceEnabled(Base.dataPersistence);

它将保留数据而无需长时间重复读取

2。您应该检查您的数据库，如果格式错误，它将失效

3。我有最简单的方法，您只需在firebase datebase根目录中记录大小

您只需阅读大小，然后生成随机整数以获取报价，或者先创建一个随机数公式即可轻松指定报价，而无需全部下载。

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