android– 无法在recyclerView.adapter中解析getActivity()

概述卡住了一点点.我尝试将getActivity更改为’c'(上下文),但getSupportFragmentManager获得相同的错误.阅读不同的主题,但找不到解决方案.检查过库并尝试更改它们但没有.非常感谢一些帮助！importandroid.app.Activity;importandroid.content.Context;importandroid.support.v

卡住了一点点.我尝试将getActivity更改为’c'(上下文),但getSupportFragmentManager获得相同的错误.阅读不同的主题,但找不到解决方案.检查过库并尝试更改它们但没有.非常感谢一些帮助！

 import androID.app.Activity; import androID.content.Context; import androID.support.v4.app.FragmentManager; import androID.support.v4.app.FragmentTransaction; import androID.support.v4.app.DialogFragment; import androID.support.v4.app.Fragment; import androID.support.v7.Widget.RecyclerVIEw; import androID.vIEw.LayoutInflater; import androID.vIEw.VIEw; import androID.vIEw.VIEwGroup; import androID.Widget.Toast; import com.bumptech.glIDe.GlIDe; import com.bumptech.glIDe.load.engine.diskCacheStrategy; import com.example.mrti.menu.Fragments.MealsListFragment; import com.example.mrti.menu.R; import java.util.ArrayList; public class categoryAdapter extends RecyclerVIEw.Adapter<VIEwHolder> {Context c;ArrayList<category> CategorIEs;public categoryAdapter(Context c, ArrayList<category> CategorIEs) {    this.c = c;    this.CategorIEs = CategorIEs;}// INITIAliZE HolDER@OverrIDepublic VIEwHolder onCreateVIEwHolder(VIEwGroup vIEwGroup, int vIEwType) {    VIEw v = LayoutInflater.from(vIEwGroup.getContext()).inflate(R.layout.rec_item, null);    VIEwHolder holder = new VIEwHolder(v);    return holder;}@OverrIDepublic voID onBindVIEwHolder(VIEwHolder holder, final int position) {    // BIND DATA TO VIEWS    holder.mnameTextVIEw.setText(CategorIEs.get(position).getname());    // LOAD IMAGES FROM WEB AND CACHE THEM    GlIDe.with(c)            .load(CategorIEs.get(position).getimage())            .diskCacheStrategy(diskCacheStrategy.ALL) // Saves the media item after all transformations to cache and                                                     // Saves just the original data to cache.            .placeholder(R.mipmap.ic_launcher)            .into(holder.img);    // ListENER    holder.setItemClickListener(new itemClickListener() {        @OverrIDe        public voID onItemClick(VIEw v, int pos) {            Toast.makeText(c, CategorIEs.get(pos).getname(), Toast.LENGTH_SHORT ).show();            MealsListFragment fragment = new MealsListFragment();            FragmentManager fragmentManager = getActivity().getSupportFragmentManager();            FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();            fragmentTransaction.replace(R.ID.root_layout, fragment);            fragmentTransaction.addToBackStack(null);            fragmentTransaction.commit();        }    });   }

解决方法:

Cannot resolve getActivity() in fragment

您的java类声明如下：

public class categoryAdapter extends RecyclerVIEw.Adapter<VIEwHolder>

categoryAdapter不是片段. categoryAdapter是RecyclerVIEw.Adapter.

RecyclerView.Adapter没有getActivity()方法.因此,您的代码将无法编译.

您似乎想要在RecyclerVIEw.Adapter中执行FragmentTransaction.但是,为了能够调用getSupportFragmentManager(),您需要托管与categoryAdapter相连的RecyclerVIEw的FragmentActivity.

但是,RecyclerVIEw.Adapter没有对FragmentActivity的直接或间接访问权限.因此,您需要将FragmentActivity放入categoryAdapter.

您当前的构造函数声明为：

public categoryAdapter(Context c, ArrayList<category> CategorIEs)

我的猜测是,在你的活动中,你正在调用新的categoryAdapter(this,somelistofcategorIEs).如果是这样,请将构造函数更改为：

public categoryAdapter(FragmentActivity c, ArrayList<category> CategorIEs)

并将您的字段更改为FragmentActivity.然后,您可以更改：

FragmentManager fragmentManager = getActivity().getSupportFragmentManager();

至：

FragmentManager fragmentManager = c.getSupportFragmentManager();

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