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
@Override
public 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;
}
@Override
public 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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