Android

Question

我的麻烦是当我想将 RecyclerView 调用到 NavigationDrawer 的 Fragment 和我通过 RecyclerView 调用的项目（数组）时未调用，但是当我不要输入 Fragment 它可以被调用。所以这是我的代码。

这是我的 Fragment.java，它说 recyclerView.setLayoutManager(layoutManager);

出错

public class fragment_1bakso extends Fragment {

private AppCompatActivity compat;
private RecyclerView recyclerView;
private MakananAdapter adapter;
public fragment_1bakso() {
    // Required empty public constructor
}

ArrayList<Makanan> mList = new ArrayList<>();
MakananAdapter mAdapter;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    /*View v = inflater.inflate(R.layout.fragment_1bakso, container, false);
    return v;*/
    View rootview = inflater.inflate(R.layout.activity_calling, container, false);
    return rootview;
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //mClass.setContentView(R.layout.activity_calling);
    //return new fragment_1bakso(R.layout.activity_calling, this);


    GridLayoutManager layoutManager = new GridLayoutManager(getActivity(), 2, GridLayoutManager.HORIZONTAL, false);
    recyclerView.setLayoutManager(layoutManager);

    mAdapter = new MakananAdapter(mList);
    recyclerView.setAdapter(mAdapter);


    fillData();
}

private void fillData() {
    Resources resources = getResources();
    String [] arJudul = resources.getStringArray(R.array.bakso);
    String [] arHarga = resources.getStringArray(R.array.bakso_price);
    String [] arDeskripsi = resources.getStringArray(R.array.bakso_desc);
    String [] arLokasi = resources.getStringArray(R.array.bakso_locations);
    String [] arDetail = resources.getStringArray(R.array.bakso_details);
    TypedArray a = resources.obtainTypedArray(R.array.bakso_pict);
    Drawable[] arFoto = new Drawable[a.length()];

    for (int i = 0; i < arFoto.length; i++)
    {
        arFoto[i] = a.getDrawable(i);
    }
    a.recycle();

    for (int i = 0; i < arJudul.length; i++)
    {
        mList.add(new Makanan(arJudul[i],arHarga[i],arFoto[i],arDeskripsi[i],arDetail[i],arLokasi[i]));
    }
    mAdapter.notifyDataSetChanged();

}}

这是我的Fragment.xml

<FrameLayout 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"
    tools:context="id.sch.smktelkom_mlg.learn.sideview.fragment_1bakso">

    <!-- TODO: Update blank fragment layout -->
    <include
        layout="@layout/activity_calling"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</FrameLayout>

这是我的 Activity_calling.xml 用来调用数组中的项目 (RecyclerView)

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.v7.widget.RecyclerView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/recyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:clipToPadding="false"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:scrollbars="vertical"
    tools:context="id.sch.smktelkom_mlg.learn.sideview.activity_1bakso" />

帮帮我，先谢谢了。

Answer 1

如果你需要网格布局管理器，你可以试试这个

GridLayoutManager layoutManager = new GridLayoutManager(this, 1);

或者您可以像这样使用水平线性布局管理器

LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.HORIZONTAL, false)

或者您可以像这样使用垂直线性布局管理器

LinearLayoutManager layoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false)

Answer 2

final RecyclerView.LayoutManager mLayoutManager =new GridLayoutManager(getContext(), 1);
    recyclerView_drawer.setLayoutManager(mLayoutManager);
    recyclerView_drawer.setItemAnimator(new DefaultItemAnimator());
    recyclerView_drawer.setAdapter(drawerAdapter);

希望这段代码对您有所帮助 you.you 也可以用相对布局替换框架布局，正如您在框架布局中所说的那样，它不起作用。

Answer 3

你还没有初始化你的recyclerView。

recyclerView = (RecyclerView) view.findViewById(R.id.your_id);

同时将代码从 onCreate() 移至 onViewCreated()；

Answer 4

您没有初始化您的 recyclerview，这可以通过以下方式完成：

RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recyclerview);

并将网格布局管理器定义为：

 GridLayoutManager gridLayoutManager = new GridLayoutManager(getContext(), 2);
    recyclerView .setHasFixedSize(true);
    recyclerView .setItemAnimator(new DefaultItemAnimator());
    recyclerView .setLayoutManager(gridLayoutManager);

是的，将您的代码从 onCreate 移至 onViewCreated 为：

 @Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
}

希望对您有所帮助..编码愉快:)

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