如何保留预定义的db文件并在Android中使用SQLiteDatabase类打开它？

Question

I am currently using SQLiteDatabase myDatabase=this.openOrCreateDatabase("conference",MODE_PRIVATE,null); for opening the database on the app side and myDatabase.execQuery() for executing queries. Now when I was testing with different devices I found that when I installed the apk file on other phones, the database I prepared with execQuery() did not carry to other phones.

I am looking to solving this problem. I assume I must keep a already-prepared .db file somewhere in the raw folder and then open the database from there.

How can I do that?

Answer 1

You should try to implement Singleton class for application rather than database,because database is created in android you cannot add them as raw db

example of singleton class

 public class CrimeLab {
    private static CrimeLab sCrimeLab;

    private List<Crime> mCrimes;
    public static CrimeLab get(Context context) {
        ...
    }
    private CrimeLab(Context context) {
        mCrimes = new ArrayList<>();
    }
    public List<Crime> getCrimes() {
        return mCrimes;
    }
    public Crime getCrime(UUID id) {
        for (Crime crime : mCrimes) {
            if (crime.getId().equals(id)) {
                return crime;
            }
        }
        return null;
    }
}