如何在Android中的两个意图之间传递arrayList [英] How to pass an arrayList between two intent in Android

问题描述

我是 Android 新手，我有一个关于意图的问题.我想通过使用意图在两个活动之间传递一个 String ArrayList.我试过这个:

I am new in Android and I have a question regarding intent. I want to pass an String ArrayList between two activities by using intent. I have tried this:

`
ArrayList<String> playerName = new ArrayList<>();
Intent intent = new Intent(this,Game.class);
intent.putStringArrayListExtra("Player",playerName);
startActivity(intent);`

然后我试图接受这样的意图:`

Then I tried to receive my intent like that: `

 ArrayList<String> playerNameList= new ArrayList<>();
 playerNameList = getIntent().getStringArrayListExtra("Player");
 int listSize = playerNameList.size();
 StringBuilder str = new StringBuilder(" ");
 str.append(listSize);
 textView.setText(str);
 StringBuilder str1 = new StringBuilder(" ");
 str1.append(playerNameList.get(2));
 textView2.setText(str1);`

我可以得到正确的listSize；但是我无法获得我的arrayList 的任何元素.我总是得到index(0)"元素.我真的很感激任何建议和帮助

I can get the correct listSize; however I am not able to get any element of my arrayList. I always get the "index(0)" element. I would be really appreciated to any advice and help

推荐答案

你可以使用 Gson 轻松搞定

you can easily to by using Gson

Intent intent = new Intent(this,Game.class);
intent.putExtra("Player",new Gson().toJson(playerName));
startActivity(intent);

在 Game.class

at Game.class

ArrayList<String> playerNameList = playerNameList = new ArrayList<>();
String str =  getIntent().getStringExtra("Player");
playerNameList = new Gson().fromJson(str,new TypeToken<ArrayList< String >>(){}.getType());

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