android项目查询号码归属地

首先要有一个号码归属地的数据库，然后把这个数据库放进assets目录下，之后在闪屏页里读取这个数据库，

放到data/data/包名/files目录下、

最后就是对这个数据库进行操作了

在闪屏页拷贝数据库文件

    private void copyDB(String dbname){
        File targetFile = new File(getFilesDir(),dbname);
        if(targetFile.exists()){
            System.out.println("已经存在了");
            return;
        }
        FileOutputStream fos = null;
        InputStream in  = null;
        try {
            fos = new FileOutputStream(targetFile);
            in = getAssets().open(dbname);
            int len = 0;
            byte[] b = new byte[1024];
            while((len=in.read(b))!=-1){
                fos.write(b, 0, len);
            }
            
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }finally{
            if(in!=null){
                try {
                    in.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            if(fos!=null){
                try {
                    fos.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }

然后具体查询操作

package com.itheima.db.dao;

import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

public class AddressDao {
    private static final String PATH = "data/data/com.itheima.superman/files/address.db";

    public static String findAddress(String phoneNumber) {
        String address="未知号码";
        // 读取一个数据库文件
        if(phoneNumber.matches("^[1]([3][0-9]{1}|59|58|88|89)[0-9]{8}$")){
            
            SQLiteDatabase database = SQLiteDatabase.openDatabase(PATH, null,
                    SQLiteDatabase.OPEN_READONLY);
            Cursor cu = database.rawQuery(
                    "select location from data2 where id=(select outkey from data1 where id=?)",
                    new String[] {phoneNumber.substring(0,7)});
            if(cu.moveToNext()){
                address = cu.getString(0);
            }
            cu.close();
            database.close();
        }
        return address;

    }
}