RecylerView可以不使用片段。当我使用片段时不起作用
RecylerView可以不使用片段。当我使用片段时不起作用
提问于 2015-04-09 03:00:24
我开始学习Android，并且在使用片段时遇到了一些困难。你能帮我弄清楚是什么问题吗？除了下面提到的内容之外，在这两个项目中，其他一切都是相同的。
1. Code without fragments (works totally fine. Gives a simple list with some data):
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerList);
LinearLayoutManager llm = new LinearLayoutManager(this);
llm.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(llm);
recyclerView.setAdapter(new MyRecyclerAdapter(generatePalettes()));
}
2. Code with Fragment (doesnt work. Blank Screen):
MainActivity
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new MainActivityFragment()).commit();
}
}
MainActivityFragment
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
RecyclerView recyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerList);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
llm.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(llm);
recyclerView.setAdapter(new PaletteAdapter(generatePalettes()));
return rootView;
}代码更改为:仍然无法工作。空屏幕显示。尝试将UI更新放在onActivityCreated和onViewCreated()中。这里有代码的Gist：https://gist.github.com/adityarb88/12f5ccce665afbf58069
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recyclerList);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
llm.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(llm);
recyclerView.setAdapter(new PaletteAdapter(generatePalettes()));
}回答 3
Stack Overflow用户
回答已采纳
发布于 2015-04-10 00:50:48
终于找到了这个问题的答案。首先，谢谢潘卡杰。你在一定程度上正确。我的布局确实不对。因此: 1.我确实将其更改为RelativeLayout，但我通过编程将该片段添加到我的活动中。2.为了看得更清楚，我改变了活动的背景和片段，并分别添加了边距和衬垫。
这样做后，我仍然无法填充回收者的观点，即使我知道我的片段是正确的添加。因此，错误出现在PaletteAdapter类中。
public PaletteAdapter(List<Palette> palettes){
this.palettes = new ArrayList<Palette>();
this.palettes.addAll(palettes);
}我在palettes.addAll(调色板)面前错过了这个。因此，列表是空的。我已经将代码上传到一个新的gist中，以防有人想要引用它：
Stack Overflow用户
发布于 2015-04-09 03:32:37
对于构建视图后的片段设置适配器：
MainActivityFragment
此方法只应膨胀并返回您的视图：
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}然后在onViewCreated(View, Bundle)或onActivityCreated(Bundle):中
@Override
public void onActivityCreated(Bundle savedInstanceState){
super.onActivityCreated(savedInstanceState);
// getView() returns your Fragments root view
RecyclerView recyclerView = (RecyclerView) getView().findViewById(R.id.recyclerList);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
llm.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(llm);
recyclerView.setAdapter(new PaletteAdapter(generatePalettes()));
}Stack Overflow用户
发布于 2015-04-09 04:40:43
你必须对你的activity_main.xml做一些修改
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:id="@+id/frame_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>在MainACtivity中，您必须使用这个frame_container id来替换您的片段
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
recyclerView = (RecyclerView) rootView .findViewById(R.id.recyclerList);
return rootView;
}
@Override
public void onActivityCreated(bala,bala, bala, cause i don't remember ) {
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
llm.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(llm);
recyclerView.setAdapter(new PaletteAdapter(generatePalettes()));
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/29528998
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