错误:由以下原因引起:java.lang.IllegalArgumentException:列\'_id\'不存在

如何解决错误:由以下原因引起:java.lang.IllegalArgumentException:列\'_id\'不存在

|| 活动课
package org.examples.events;

import android.app.ListActivity;
import android.content.ContentValues;
import android.widget.SimpleCursorAdapter;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.widget.TextView;
import static org.examples.events.Constants.TABLE_NAME;
import static org.examples.events.Constants.TITLE;
import static org.examples.events.Constants.TIME;
import static android.provider.BaseColumns._ID;

public class Events extends ListActivity {
private EventsData events;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    events = new EventsData(this);
    try {
        addEvent(\"Hello Tarun\");
        Cursor cursor = getEvent();
        showEvent(cursor);

    } finally {
        events.close();
    }
}

// Insert data into the database
// similar things can be done for delete or update
private void addEvent(String string) {
    SQLiteDatabase db = events.getWritableDatabase();
    ContentValues values = new ContentValues();
    values.put(TIME,System.currentTimeMillis());
    values.put(TITLE,string);
    db.insertOrThrow(TABLE_NAME,null,values);
}

// GET THE LIST OF EVENTS FROM DATABASE
private static String[] FROM = { _ID,TIME,TITLE };
private static String ORDER_BY = TIME + \"DESC\";

private Cursor getEvent() {
    // PERFORM A MANAGED QUERY. THE ACTIVITY WILL HANDLE CLOSING AND
    // REQUERING THE DATABASE WHEN NEEDED
    SQLiteDatabase db = events.getReadableDatabase();
    Cursor cursor = db.rawQuery(\"SELECT * from \" +TABLE_NAME,null);
    //Cursor cursor = db.query(TABLE_NAME,FROM,ORDER_BY);
    //Cursor c = sampleDB.rawQuery(\"SELECT * FROM \" +TABLE_NAME,null);
    startManagingCursor(cursor);
    return cursor;
}

// STUFF THEM ALL INTO A BIG STRINGS
// THE ADAPTER ACTS AS THE GO BETWEEN THE DATA SOURCE AND THE VIEW
public static int[] TO = { R.id.rowid,R.id.time,R.id.title };

private void showEvent(Cursor cursor) {
    SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,R.layout.item,cursor,TO);
    setListAdapter(adapter);
}

}
EventsData类是
package org.examples.events;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import static org.examples.events.Constants.TABLE_NAME;
import static org.examples.events.Constants.TITLE;
import static org.examples.events.Constants.TIME;
import static android.provider.BaseColumns._ID;

public class EventsData extends SQLiteOpenHelper {
public static final String DATABASE_NAME = \"events.db\";

public static final int DATABASE_VERSION = 1;
public static final String CREATE_TABLE = \"CREATE TABLE events (\" +Constants._ID+
        \" INT AUTO_INCREMENT PRIMARY KEY,\" +
        \" time INTEGER,title TEXT NOT NULL); \";

public EventsData(Context ctx) {
    super(ctx,DATABASE_NAME,DATABASE_VERSION);
    // TODO Auto-generated constructor stub
}

@Override
public void onCreate(SQLiteDatabase db) {
    db.execSQL(CREATE_TABLE);
}

@Override
public void onUpgrade(SQLiteDatabase db,int oldVersion,int newVersion) {
    db.execSQL(\"drop table if exists\" + TABLE_NAME);
    onCreate(db);

}

}
和常量如下
package org.examples.events;
import android.provider.BaseColumns;;

public interface Constants extends BaseColumns{
public static final String TABLE_NAME = \" events \";


// coloumns in the table
public static final String TIME = \" time \";
public static final String TITLE = \" title \";
public static final String _ID = \" _id \";
}
    

解决方法

        在
Events
中,您有
import
android.provider.BaseColumns._ID;
而不是被覆盖
org.examples.events.Constants._ID;
    

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