java - 无法将db '/data/data/my.easymedi.controller/databases/EasyMediInfo.db'的语言环境更改为 'en_US'

在我的Android应用程序中， Assets 文件夹中有一个预定义的数据库。

我创建了一个表android_metadata，该表的列名为locale，其中一个记录是en_US。

在我的应用程序中，用户应输入他/她的详细信息，然后单击“保存”按钮。

当单击保存按钮时，出现以下错误；



我的DBHelper类正在关注；

package my.easymedi.db;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import my.easymedi.entity.Person;
import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.widget.Toast;

public class DBHelper extends SQLiteOpenHelper {

 private static final String pkg = "my.easymedi.controller";
 private static String DB_PATH = "";
 private static String DB_NAME = "EasyMediInfo.db";
 private static final int DB_VERSION = 1;
 private final Context myContext;
 private SQLiteDatabase myDatabase;

 public DBHelper(Context context) {
  super(context, DB_NAME, null, DB_VERSION);
  // this.myContext = context;
  if (android.os.Build.VERSION.SDK_INT >= 4.2) {
   DB_PATH = context.getApplicationInfo().dataDir + "/databases/";
  } else {
   DB_PATH = "/data/data/" + context.getPackageName() + "/databases/";
  }
  this.myContext = context;
 }

 public void createDataBase() {
  boolean dbExist = checkDataBase();
  System.out.println("===" + dbExist + "===");
  if (dbExist) {
   // do nothing - database already exist
  } else {

   this.getReadableDatabase();
   this.close();
   try {
    copyDataBase();
    Log.d("CREATE_DB", "createDatabase database created");
   } catch (IOException e) {
    Toast.makeText(myContext, e.getMessage(), Toast.LENGTH_SHORT)
     .show();
    Log.d("CREATE_DB", e.getMessage());
   }
  }
 }

 private void copyDataBase() throws IOException {
  System.out.println("***copy db***");
  InputStream databaseInput = null;
  /* Path to copy the database */
  String outFileName = DB_PATH + DB_NAME;
  /* open the empty database as an output stream */
  OutputStream databaseOutput = new FileOutputStream(outFileName);
  /* open the local database as the input stream */
  databaseInput = myContext.getAssets().open(DB_NAME);

  /* Transfer byte from byte from input file to output file */
  byte[] buffer = new byte[1024];
  int length = databaseInput.read(buffer);
  while (length > 0) {
   databaseOutput.write(buffer, 0, length);
   //databaseOutput.flush();
  }
  databaseOutput.flush();
  databaseInput.close();
  databaseOutput.close();
 }

 private boolean checkDataBase() {
  File dbFile = new File(DB_PATH + DB_NAME);
  return dbFile.exists();
  /*SQLiteDatabase checkDB = null;
  try {
    String myPath = DB_PATH + DB_NAME;
    checkDB = SQLiteDatabase.openDatabase(myPath, null,
            SQLiteDatabase.NO_LOCALIZED_COLLATORS);
  } catch (SQLiteException e) {
    Toast.makeText(myContext, e.getMessage(), Toast.LENGTH_SHORT)
            .show();
    Log.d("Check_DB", e.getMessage());
  }
  if (checkDB != null) {
    String str = "checked";
    System.out.println("====" + str + "====");
    checkDB.close();
  }
  return checkDB != null ? true : false;*/
 }

 /* Open the database */
 public boolean openDataBase() {
  String myPath = DB_PATH + DB_NAME;
  Toast.makeText(myContext, myPath, Toast.LENGTH_SHORT).show();
  myDatabase = SQLiteDatabase.openDatabase(myPath, null,
   SQLiteDatabase.OPEN_READWRITE);
  if (myDatabase != null) {
   System.out.println("====database opened====");
  } else {
   System.out.println("====error opening database====");
  }
  return myDatabase != null ? true : false;
 }

 public void closeDatabase() {
  if (myDatabase != null) {
   myDatabase.close();
  }
 }

 @Override
 public void onCreate(SQLiteDatabase db) {
  // TODO Auto-generated method stub

 }

 @Override
 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
  // TODO Auto-generated method stub

 }

 public boolean insertIntoDatabase(String table, ContentValues values) {
  try {
   myDatabase.insert(table, null, values);
   Log.d("INSERT", "Information Saved");
   return true;
  } catch (Exception e) {
   // TODO Auto-generated catch block
   Log.d("INSERT", e.toString());
   return false;
  }
 }
}

这是我的保存按钮的代码段；

case R.id.btnSave: personName = etName.getText().toString();
date_of_birth = tvDOB.getText().toString();
age = tvAge.getText().toString();

int selected_rb_ID = genderGrp.getCheckedRadioButtonId();
RadioButton rb = (RadioButton) findViewById(selected_rb_ID);
gender = rb.getText().toString();
bloodGrp = spiBloodGrp.getSelectedItem().toString();

Person person = new Person();
person.setName(personName);
person.setDate_of_birth(date_of_birth);
person.setAge(age);
person.setGender(gender);
person.setBloodGrp(bloodGrp);

ContentValues values = new ContentValues();
values.put(COLUMN_PERSON_NAME, person.getName());
values.put(COLUMN_DOB, person.getDate_of_birth());
values.put(COLUMN_AGE, person.getAge());
values.put(COLUMN_GENDER, person.getGender());
values.put(COLUMN_BLOODGRP, person.getBloodGrp());

DBHelper dbHelper = new DBHelper(this);
dbHelper.createDataBase();
dbHelper.openDataBase();
if (dbHelper.insertIntoDatabase("EMPerson", values)) {
 Toast.makeText(
  getApplicationContext(),
  "Data has been saved successfully",
  Toast.LENGTH_SHORT
 ).show();
} else {
 Toast.makeText(
  getApplicationContext(),
  "Oops ! Try again",
  Toast.LENGTH_SHORT
 ).show();
}
dbHelper.closeDatabase();

break;

在我的主要 Activity 中，我通过调用此代码段来创建数据库。

final DBHelper helper = new DBHelper(this);
helper.createDataBase();

该错误的含义是什么，我该如何解决？

最佳答案

您的copyDataBase()函数从 Assets 文件夹复制db(EasyMediInfo.db)。似乎数据库是使用与'en_US'不同的语言环境创建的。

编辑

尝试更改:

myDatabase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);

至:

myDatabase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS | SQLiteDatabase.OPEN_READWRITE);