完整错误：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.myfavoriteplaces.myfavoriteplaces, PID: 32383
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myfavoriteplaces.myfavoriteplaces/com.myfavoriteplaces.myfavoriteplaces.ListPlaces}: java.lang.IllegalArgumentException: column '_id' does not exist
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2695)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769)
at android.app.ActivityThread.access$900(ActivityThread.java:177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5910)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)
Caused by: java.lang.IllegalArgumentException: column '_id' does not exist
at android.database.AbstractCursor.getColumnIndexOrThrow(AbstractCursor.java:303)
at android.widget.CursorAdapter.init(CursorAdapter.java:172)
at android.widget.CursorAdapter.<init>(CursorAdapter.java:149)
at android.widget.ResourceCursorAdapter.<init>(ResourceCursorAdapter.java:91)
at android.widget.SimpleCursorAdapter.<init>(SimpleCursorAdapter.java:104)
at com.myfavoriteplaces.myfavoriteplaces.ListPlaces.displayListView(ListPlaces.java:49)
at com.myfavoriteplaces.myfavoriteplaces.ListPlaces.onCreate(ListPlaces.java:35)
at android.app.Activity.performCreate(Activity.java:6178)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2648)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769)
at android.app.ActivityThread.access$900(ActivityThread.java:177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5910)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)
我的代码类BD：
package com.myfavoriteplaces.myfavoriteplaces;
public class BD {
private int _id;
private String nom_place;
private String type_place;
private String address_place;
private String description_place;
public BD(int id, String nom, String type, String address, String description){
this._id = id;
this.nom_place = nom;
this.type_place = type;
this.address_place = address;
this.description_place = description;
}
public int getId_place(){ return _id; }
public void setId_place(int id){
this._id = id;
}
public String getNom_place(){
return nom_place;
}
public void setNom_place(String nom){
this.nom_place = nom;
}
public String getType_place(){
return type_place;
}
public void setType_place(String type){
this.type_place = type;
}
public String getAddress_place(){
return address_place;
}
public void setAddress_place(String address){
this.address_place = address;
}
public String getDescription_place(){
return description_place;
}
public void setDescription_place(String description){
this.description_place = description;
}
}
BDManager类：
package com.myfavoriteplaces.myfavoriteplaces;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
public class BDManager {
private static final String TABLE_NAME = "places";
public static final String KEY_ID_PLACE = "_id";
public static final String KEY_NOM_PLACE = "nom_place";
public static final String KEY_TYPE_PLACE = "type_place";
public static final String KEY_ADDRESS_PLACE = "address_place";
public static final String KEY_DESCRIPTION_PLACE = "description_place";
public static final String CREATE_TABLE_PLACES = "CREATE TABLE "+TABLE_NAME+" " +
" (" +
" "+KEY_ID_PLACE+" INTEGER primary key autoincrement," +
" "+KEY_NOM_PLACE+" TEXT" +
" "+KEY_TYPE_PLACE+" TEXT" +
" "+KEY_ADDRESS_PLACE+" TEXT" +
" "+KEY_DESCRIPTION_PLACE+" TEXT" +
");";
private MySQLite maBaseSQLite;
private SQLiteDatabase db;
public BDManager(Context context){
maBaseSQLite = MySQLite.getInstance(context);
}
public void open() {
db = maBaseSQLite.getWritableDatabase();
}
public void close() {
db.close();
}
public long addPlace(BD place){
ContentValues values = new ContentValues();
values.put(KEY_NOM_PLACE, place.getNom_place());
values.put(KEY_TYPE_PLACE, place.getType_place());
values.put(KEY_ADDRESS_PLACE, place.getAddress_place());
values.put(KEY_DESCRIPTION_PLACE, place.getDescription_place());
return db.insert(TABLE_NAME,null,values);
}
public int modPlace(BD place){
ContentValues values = new ContentValues();
values.put(KEY_NOM_PLACE, place.getNom_place());
values.put(KEY_TYPE_PLACE, place.getType_place());
values.put(KEY_ADDRESS_PLACE, place.getAddress_place());
values.put(KEY_DESCRIPTION_PLACE, place.getDescription_place());
String where = KEY_ID_PLACE+" = ?";
String[] whereArgs = {place.getId_place()+""};
return db.update(TABLE_NAME, values, where, whereArgs);
}
public BD getPlace(int id){
BD p = new BD(0,"","","","");
Cursor c = db.rawQuery("SELECT * FROM "+TABLE_NAME+" WHERE "+KEY_ID_PLACE+"="+id, null);
if (c.moveToFirst()){
p.setId_place(c.getInt(c.getColumnIndex(KEY_ID_PLACE)));
p.setNom_place(c.getString(c.getColumnIndex(KEY_NOM_PLACE)));
p.setType_place(c.getString(c.getColumnIndex(KEY_TYPE_PLACE)));
p.setAddress_place(c.getString(c.getColumnIndex(KEY_ADDRESS_PLACE)));
p.setDescription_place(c.getString(c.getColumnIndex(KEY_DESCRIPTION_PLACE)));
c.close();
}
return p;
}
public Cursor getPlaces(){
return db.rawQuery("SELECT * FROM "+TABLE_NAME, null);
}
}
我完全不知道出了什么问题，花了几个小时试图修复它但它仍在崩溃。错误谈论＆＃34; _id＆＃34;但我添加它仍然无法正常工作......
答案 0 :(得分：0)
当我尝试打开此页面时崩溃了。在这个页面中，我只想将数据库中的所有名称放置到列表视图中。
package com.myfavoriteplaces.myfavoriteplaces;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast;
public class ListPlaces extends AppCompatActivity {
ListView mListView;
BDManager sav;
SimpleCursorAdapter dataAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_places);
mListView = (ListView) findViewById(R.id.affichage_listplace);
sav = new BDManager(this);
sav.open();
sav.getPlaces();
displayListView();
}
private void displayListView(){
Cursor cursor = sav.getPlaces();
String[] columns = new String[]{
BDManager.KEY_NOM_PLACE
};
int[] to = new int[] {
R.id.NomPlace
};
dataAdapter = new SimpleCursorAdapter(
this, R.layout.list_places,
cursor,
columns,
to,
0
);
mListView = (ListView) findViewById(R.id.affichage_listplace);
mListView.setAdapter(dataAdapter);
}
}