我得到无法解决所有RecyclerView上的符号错误。到底是怎么回事?因为我的RecyclerView有错误,所以我在LayoutManager上也有错误。我最近的四次覆盖声明是错误的,我不知道他们去了哪里。我是初学者,对编程有很基本的了解,所以我不知道如何解决这个问题。我正在上课,但教授根本没有帮助。RecyclerView“无法解析符号”错误 - Android Studio
package com.bignerdranch.android.criminalintent;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;
import java.util.List;
public class CrimeListFragment extends Fragment {
private RecyclerView mCrimeRecyclerView;
private CrimeAdapter mAdapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_crime_list, container, false);
mCrimeRecyclerView = (RecyclerView) view
.findViewById(R.id.crime_recycler_view);
mCrimeRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
return view;
}
@Override
public void onResume() {
super.onResume();
updateUI();
}
private void updateUI(){
CrimeLab crimeLab = CrimeLab.get(getActivity());
List<Crime> crimes = crimeLab.getCrimes();
if (mAdapter == null) {
mAdapter = new CrimeAdapter(crimes);
mCrimeRecyclerView.setAdapter(mAdapter);
} else {
mAdapter.notifyDataSetChanged();
}
}
private class CrimeAdapter extends RecyclerView.Adapter<CrimeHolder> {
private List<Crime> mCrimes;
public CrimeAdapter(List<Crime> crimes) {
mCrimes = crimes;
}
}
private class CrimeHolder extends RecyclerView.ViewHolder
implements View.OnClickListener {
private TextView mTitleTextView;
private TextView mDateTextView;
private CheckBox mSolvedCheckBox;
private Crime mCrime;
public CrimeHolder(View itemView) {
super(itemView);
mTitleTextView = (TextView)
itemView.findViewById(R.id.list_item_crime_title_text_view);
mDateTextView = (TextView)
itemView.findViewById(R.id.list_item_crime_date_text_view);
mSolvedCheckBox = (CheckBox)
itemView.findViewById(R.id.list_item_crime_solved_check_box);
}
public void bindCrime(Crime crime) {
mCrime = crime;
mTitleTextView.setText(mCrime.getTitle());
mDateTextView.setText(mCrime.getDate().toString());
mSolvedCheckBox.setChecked(mCrime.isSolved());
}
@Override
public CrimeHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(getActivity());
View view = layoutInflater.inflate(R.layout.list_item_crime, parent, false);
return new CrimeHolder(view);
}
@Override
public void onBindViewHolder(CrimeHolder holder, int position) {
Crime crime = mCrimes.get(position);
holder.bindCrime(crime);
}
@Override
public int getItemCount() {
return mCrimes.size();
}
@Override
public void onClick(View v) {
Intent intent = CrimeActivity.newIntent(getActivity(), mCrime.getId());
startActivity(intent);
}
}
}
检查你的依赖项应该是这样的:'compile'com.android.support:recyclerview -v7:xx.x.x'' - x的版本 –
这应该在我的库依赖? – rpach17
是的,在模块级别。检查版本的其他Android依赖版本,应该是'24.2.1',并匹配它。 –