java - Android SDK 错误 (BNR)

Question

嘿伙计们，我正在尝试学习 Android SDK，我买了 Bill Phillips 和 Brian Hardy 写的《Big Nerd on Ranch》一书，但我被困在第 9 章，到处都是我无法解决的错误。我这里有 5 个错误，它们都说“无法解析(符号)”。所有这些符号都存在于我的程序中，所以我不明白为什么它找不到它们。这是我的主类 CrimeListFragment.java。代码有点长，但我用注释标记了所有错误出现的位置(可能需要向右滚动)。

CrimeListFragment.java

package criminalintent.android.bignerdranch.com.criminalintent;

import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.R;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;

import java.util.ArrayList;

/**
 * Created by Matt on 7/28/2014.
 */
public class CrimeListFragment extends ListFragment {
    private ArrayList<Crime> mCrimes;
    private static final String TAG = "CrimeListFragment";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getActivity().setTitle(R.string.crime_title); //ERROR here 'crime_title'
        mCrimes = CrimeLab.get(getActivity()).getCrimes();
        CrimeAdapter adapter = new CrimeAdapter(mCrimes);
        setListAdapter(adapter);

    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        Crime c = ((CrimeAdapter)getListAdapter()).getItem(position);
        Log.d(TAG, c.getTitle() + " was clicked");
    }

    private class CrimeAdapter extends ArrayAdapter<Crime> {

        public CrimeAdapter(ArrayList<Crime> crimes) {
            super(getActivity(), 0, crimes);
        }

        @Override
        public View getView(int position, View convertView, ViewGroup part) {
            //If we werent given a view, inflate one
            if(convertView == null) {
                convertView = getActivity().getLayoutInflater()
                        .inflate(R.layout.list_item_crime,null);//ERROR 'list_item_crime'
            }

            //Configure the view for this Crime
            Crime c = getItem(position);

            TextView titleTextView = (TextView)convertView.findViewById(R.id.crime_list_item_titleTextView);//ERROR 'crime_list_item_titleTextView'
            titleTextView.setText(c.getTitle());
            TextView dateTextView = (TextView)convertView.findViewById(R.id.crime_list_item_dateTextView);//ERROR 'crime_list_item_dateTextView'
            dateTextView.setText(c.getDate().toString());
            CheckBox solvedCheckBox = (CheckBox)convertView.findViewById(R.id.crime_list_item_solvedCheckBox);//ERROR 'crime_list_item_solvedCheckBox'
            solvedCheckBox.setChecked(c.isSolved());

            return convertView;
        }
    }
}

这是我的 strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">CriminalIntent</string>
    <string name="title_activity_crime">CrimeActivity</string>
    <string name="crime_title_hint">Enter a title for this crime</string>
    <string name="crime_title_label">Title</string>
    <string name="crime_details_label">Details</string>
    <string name="crime_solved_label">Solved?</string>
    <string name="crime_title">Crimes</string>

</resources>

和list_item_crime.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/crime_list_item_solvedCheckBox"
        android:gravity="center"
        android:layout_alignParentRight="true"
        android:enabled="false"
        android:padding="4dp"
        android:focusable="false"/>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/crime_list_item_titleTextView"
        android:layout_toLeftOf="@id/crime_list_item_solvedCheckBox"
        android:textStyle="bold"
        android:paddingLeft="4dp"
        android:paddingRight="4dp"
        android:text="Crime title"
        />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/crime_list_item_dateTextView"
        android:layout_below="@id/crime_list_item_titleTextView"
        android:layout_toLeftOf="@id/crime_list_item_solvedCheckBox"
        android:paddingLeft="4dp"
        android:paddingRight="4dp"
        android:paddingTop="4dp"
        android:text="Crime date"/>
</RelativeLayout>

如果您需要更多资源，请告诉我。谢谢您的帮助。

Answer 1

您的R导入错误(import android.R;)。删除该行并导入属于您的项目的行