问题将arraylist从意图传递到另一个意图 [英] issue to pass arraylist from an intent to another

问题描述

在问这里之前，我首先搜索如何从一个意图传递一个阵列列表到另一个意图。感谢SO上发布的一篇文章，我认为我找到了一种方法。

事情是，当我尝试显示来自数组列表的元素时我的目标活动，我只得到我原来在离职活动中的众多元素之一。

为了说清楚，我的代码在我的fisrt活动中：

  HashMap map = new HashMap< String，String>（）; 
 
 map.put（key1，value1）; 
 map.put（key2，value2）; 
 
 arrayList.add（map）; 
 Log.d（arrayList，String.valueOf（arrayList））; 
  

在logcat中，我有预期的元素：

  D / arrayList :: [{key1：value1}，{key2，value2} 
  

然后，我追求这一点：

 意图意图= new Intent（MyFirstActivity.this，MySecondActivity.class）; 
 intent.putExtra（arrayList，arrayList）; 
  

现在，这是我的第二个活动，应该是收到的元素。

  Intent intent = getIntent（）; 
 arrayList =（ArrayList< HashMap< String，String>>）getIntent（）。getSerializableExtra（arrayList）; 
 Log.d（arraySecondActivity，String.valueOf（arrayList））; 
  

在logcat中，只显示我的第二个项目：

  D / arraySecondActivity：[{key2 = value2}] 
  

我不知道为什么......有人可能知道吗？

谢谢！

解决方案

intent.putExtra（arrayList，arrayList）; 在代码中存在这个错误。
序列化Array列表之前像下面传递ArrayList

尝试此代码

  ArrayList< Object> object = new ArrayList< Object>（）; 
 Intent intent = new Intent（Current.class，next.class）; 
 Bundle args = new Bundle（）; 
 args.putSerializable（ARRAYLIST，（Serializable）object）; 
 intent.putExtra（BUNDLE，args）; 
 startActivity（intent）; 
  

在接下来的类中

  Intent intent = getIntent（）; 
 Bundle args = intent.getBundleExtra（BUNDLE）; 
 ArrayList< Object> object =（ArrayList< Object>）args.getSerializable（ARRAYLIST）; 
  

Before asking here, i first search how to pass an arraylist from an intent to another. Thanks to one of the post made on SO, I thought i found a way to do so.

The thing is, when i try to display the elements from the arraylist of my target activity, i only get one of the numerous elements i originally have in my departure activity.

To put it in clear, here is my code in my fisrt activity :

HashMap map = new HashMap<String,String>();

map.put("key1","value1");
map.put("key2","value2");

arrayList.add(map);
Log.d("arrayList", String.valueOf(arrayList));

In the logcat, I have the expected elements :

D/arrayList:: [{"key1":"value1"},{"key2","value2"}

Then, i pursue with this :

Intent intent = new Intent(MyFirstActivity.this,MySecondActivity.class);
intent.putExtra("arrayList",arrayList);

Now, this is my second activity where should be the received elements.

Intent intent = getIntent();
arrayList = (ArrayList<HashMap<String,String>>) getIntent().getSerializableExtra("arrayList");
Log.d("arraySecondActivity", String.valueOf(arrayList));

In the logcat, only my second item is display :

D/arraySecondActivity: [{key2=value2}]

and i don't know why ... does someone maybe know ?

thanks !

解决方案

intent.putExtra("arrayList",arrayList); this wrong in your code. Serializable the arraylist before pass like below

Try this code

 ArrayList<Object> object = new ArrayList<Object>();
 Intent intent = new Intent(Current.class, next.class);
 Bundle args = new Bundle();
 args.putSerializable("ARRAYLIST",(Serializable)object);
 intent.putExtra("BUNDLE",args);
 startActivity(intent);

In the next.class

 Intent intent = getIntent();
 Bundle args = intent.getBundleExtra("BUNDLE");
 ArrayList<Object> object = (ArrayList<Object>)  args.getSerializable("ARRAYLIST");

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