java 如何将 ArrayList 从 Activity 传递到 Fragment
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How to pass an ArrayList from Activity to a Fragment
提问by Amr SubZero
What i'm trying to do is sending ArrayList<String>from Activityto ListFragment
我想要做的是ArrayList<String>从Activity发送到ListFragment
So i can use the Fragments in a TableLayout
所以我可以在一个 TableLayout
It's not necessary to use ListFragment, i can use any type of Fragments, but i'm trying to get the idea.
没有必要使用 ListFragment，我可以使用任何类型的 Fragment，但我正在尝试了解这个想法。
Here's my MainActivity:
这是我的MainActivity：
FragmentTransaction fragmentTransaction;
ArrayList<String> namesArray = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
namesArray.add("Android");
namesArray.add("Iphone");
namesArray.add("Windows Phone");
Bundle bundle = new Bundle();
bundle.putStringArrayList("valuesArray", namesArray);
namesFragment myFragment = new namesFragment();
myFragment.setArguments(bundle);
fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.main_container, new namesFragment());
fragmentTransaction.commit();
}
My ListFragment:
我的列表片段：
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
ArrayList<String> values = getArguments().getStringArrayList("valuesArray");
ArrayAdapter<String> adapter = new ArrayAdapter<>(getActivity(), android.R.layout.simple_list_item_1, values);
setListAdapter(adapter);
}
I've searched a lot, but i didn't find anything useful, and this code above gives me Unfortunately app has stopped
我搜索了很多，但没有找到任何有用的东西，上面的代码给了我 Unfortunately app has stopped
So how can i achieve something like that?
那么我怎样才能实现这样的目标呢？
回答by Andre Classen
You are instantiating your fragment twice :D
您正在两次实例化您的片段：D
Just change u'r code to:
只需将您的代码更改为：
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
namesArray.add("Android");
namesArray.add("Iphone");
namesArray.add("Windows Phone");
Bundle bundle = new Bundle();
bundle.putStringArrayList("valuesArray", namesArray);
namesFragment myFragment = new namesFragment();
myFragment.setArguments(bundle);
fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.main_container, myFragment);
fragmentTransaction.commit();
}
回答by Arslan Sohail
Not the answer but you can avoid creating a Fragment Transaction object by replacing last three lines with this
不是答案，但您可以通过用此替换最后三行来避免创建 Fragment Transaction 对象
getSupportFragmentManager()
.beginTransaction()
.add(R.id.main_container, new namesFragment())
.commit();
