用于存储联系人的Android应用程序

Question

我开始学习Android编程，有一个这样的任务：

创建Android应用程序，在其中实现以下功能：

package com.example.zadatak1;

public class Contact {

    int id;
    String name;
    String phone;

    public Contact(){

    }

    public Contact(int id, String name, String phone){
        this.id=id;
        this.name=name;
        this.phone=phone;
    }

    public Contact(String name, String phone){
        this.name=name;
        this.phone=phone;
    }

    public int getID(){
        return this.id;
    }

    public void setID(int id){
        this.id=id;
    }

    public String getName(){
        return this.name;
    }

    public void setName(String name){
        this.name=name;
    }

    public String getPhone(){
        return this.phone;
    }

    public void setPhone(String phone){
        this.phone=phone;
    }

}

问题出现在文件末尾的handler.java行中：

package com.example.zadatak1;

import java.util.ArrayList;
import java.util.List;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class Handler extends SQLiteOpenHelper {

    private static final String DB_NAME = "databaseContact";
    private static final String TABLE_NAME = "contacts";
    private static final String ID = "id";
    private static final String NAME = "name";
    private static final String PHONE = "phone_number";

    private static final int DATABASE_VERSION = 1;

    public Handler(Context context){
        super(context, DB_NAME, null, DATABASE_VERSION);
    }



@Override
public void onCreate(SQLiteDatabase db) {

    String CREATE_CONTACTS = "CREATE_TABLE " + TABLE_NAME + ID + "INTEGER PRIMARY KEY," + NAME + "TEXT," + PHONE + "TEXT" + ")";
    db.execSQL(CREATE_CONTACTS);
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
    onCreate(db);
}

void addContact(Contact contact){
    SQLiteDatabase db = this.getWritableDatabase();
    ContentValues values = new ContentValues();
    values.put(NAME, contact.getName());
    values.put(PHONE, contact.getPhone());

    db.insert(TABLE_NAME, null, values);
    db.close();

}

    Contact getContact(int id){
    SQLiteDatabase db = this.getReadableDatabase();

    Cursor cursor = db.query(TABLE_NAME, new String[]{ID,NAME,PHONE}, NAME, new String[]{String.valueOf(id)}, null, null, null, null);
    if(cursor!=null)
        cursor.moveToFirst();

    Contact contact = new Contact(Integer.parseInt(cursor.getString(0)), cursor.getString(1), cursor.getString(2));

    return contact;

    }

    public List<Contact> getAllContacts(){
        List<Contact> contactList = new ArrayList<Contact>();

        String selectQuery = "SELECT * FROM " + TABLE_NAME+ " ORDER BY " + NAME + "ASC";
        SQLiteDatabase db = this.getWritableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);

        return contactList;
    }

        Contact contact = new Contact ();
        contact.setID(Integer.parseInt(cursor.getString(0)));
        contact.setName(cursor.getString(1));
        contact.setPhone(cursor.getString(2));

}

对于“setid”、“setname”和“setphone”，我得到了错误：“这一行有多个标记-标记上的语法错误，相反需要AnnotationName-标记”setid“上的语法错误，该标记后需要标识符-标记上的语法错误”（“，delete this token-标记上的语法错误，删除这些标记”）

此行有多个标记-内标识语法错误,应为AnnotationName-内标识“SetName”语法错误,此内标识后应为Identifier-语法错误,插入“Type VariableDeclaratorID”以完成FormalParameterList“

此行有多个标记-内标识“setphone”上的语法错误，在此内标识之后需要标识符-语法错误，插入“Type variableDeclaratorId”以完成FormalParameterList-内标识上的语法错误，需要AnnotationName

有人帮忙吗？：（

Answer 1

这部分代码必须在某个方法中，而不仅仅是在类体中。将这部分代码转移到其他需要的地方（我不懂逻辑，所以说不出它应该在哪里）：

Contact contact = new Contact ();
 contact.setID(Integer.parseInt(cursor.getString(0)));
 contact.setName(cursor.getString(1));
 contact.setPhone(cursor.getString(2));