我想在Android Studio上询问我的SQLite数据库。我有一个数据库并存储在此路径中： /data/data/com.example.ilhamakbar.yukmasakbygd/databases / 。
当我从Nox App Player打开它时，数据库工作并显示我已经插入的所有表和所有数据。但是，当我构建我的APK并从我的手机（ Android 6.0.1 Marshmallow ）运行它时，它说我的数据库中没有数据。
例如，当我点击TabActivityAdministrator.java上的按钮View时，数据库将显示在Nox App播放器中，但不会显示在我的手机中。
我已经按照以下链接中的一些内容进行了操作，但它似乎无法正常工作。
这是我的DatabaseHelper.java
public class DatabaseHelper extends SQLiteOpenHelper {
// DATABASE NAME
public static String DATABASE_PATH = "/data/data/com.example.ilhamakbar.yukmasakbygd/databases/";
public static final String DATABASE_NAME = "yukmasak.db";
private final Context myContext;
private SQLiteOpenHelper openHelper;
private SQLiteDatabase myDatabase;
int id = 0;
Random random = new Random();
//TABLE NAMES
public static final String EXPERT_TABLE = "expertTable";
public static final String INGREDIENTS_TABLE = "ingredientsTable";
public static final String MENU_TABLE = "menuTable";
// FOUR LINES BELOW ARE CODES FOR EXPERT TABLE'S COLUMNS NAME. SO PLEASE DON'T MESS IT UP
public static final String COL_EXPERT_CODE = "expertCode";
public static final String COL_EXPERT_NAME = "expertName";
public static final String COL_EXPERT_WEIGHTING = "expertWeighting";
// FOUR LINES BELOW ARE CODES FOR INGREDIENTS TABLE'S COLUMNS NAME. SO PLEASE DON'T MESS IT UP
public static final String COL_INGREDIENTS_CODE = "ingredientsCode";
public static final String COL_INGREDIENTS_CODEFK = "ingredientsCodeFK";
public static final String COL_INGREDIENTS_NAME = "ingredientsName";
public static final String COL_INGREDIENTS_QTY = "ingredientsQty";
// FOUR LINES BELOW ARE CODES FOR MENU TABLE'S COLUMNS NAME. SO PLEASE DON'T MESS IT UP
public static final String COL_MENU_CODE = "menuCode";
public static final String COL_MENU_NAME = "menuName";
public static final String COL_MENU_PICTURE = "menuPictures";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
this.myContext = context;
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + EXPERT_TABLE + "(expertCode STRING PRIMARY KEY, expertName TEXT, expertWeighting FLOAT)");
db.execSQL("CREATE TABLE " + INGREDIENTS_TABLE + "(ingridientsCode STRING PRIMARY KEY, ingridientsCodeFK STRING, ingredientsName TEXT, ingredientsQty FLOAT, FOREIGN KEY (ingridientsCodeFK) REFERENCES EXPERT_TABLE(expertCode))");
db.execSQL("CREATE TABLE " + MENU_TABLE + "(menuCode STRING PRIMARY KEY, menuName TEXT, menuPictures BLOB)");
createDB();
}
private void createDB(){
boolean dbExist = dbExists();
if(!dbExist){
copyDatabase();
}
else if(dbExist){
copyDatabase();
}
}
private boolean dbExists(){
SQLiteDatabase db = null;
try{
String dbPath = DATABASE_PATH + DATABASE_NAME;
db = SQLiteDatabase.openDatabase(dbPath, null, SQLiteDatabase.OPEN_READWRITE);
db.setLocale(Locale.getDefault());
db.setLockingEnabled(true);
db.setVersion(1);
}
catch(SQLiteException e){
Log.e("SQL Helper", "database not found");
}
if(db != null){
db.close();
}
return db != null ? true : false;
}
// Additional codes and will be deleted if not working
public void createDatabase() throws IOException{
boolean dbExist = checkDatabase();
if(dbExist){
//do nothing - database already exist
}else{
//By calling this method and empty database will be created into the default system path
//of your application so we are gonna be able to overwrite that database with our database.
this.getReadableDatabase();
try{
copyDatabase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
createDB();
}
private boolean checkDatabase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DATABASE_PATH + DATABASE_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}catch(SQLiteException e){
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
public void openDB(){
this.myDatabase = openHelper.getWritableDatabase();
}
public void closeDB(){
if(myDatabase != null){
this.myDatabase.close();
}
}
private void copyDatabase(){
InputStream iStream = null;
OutputStream oStream = null;
// Path to the just created empty db
String outFileName = DATABASE_PATH + DATABASE_NAME;
try{
iStream = myContext.getAssets().open(DATABASE_NAME); // Open your local db as the input stream
oStream = new FileOutputStream(outFileName); // Open the empty db as the output stream
byte[] buffer = new byte[1024]; // Transfer bytes from the inputfile to the outputfile
int length;
while ((length = iStream.read(buffer))>0){
oStream.write(buffer, 0, length);
}
//Close the streams
oStream.flush();
oStream.close();
iStream.close();
}
catch(IOException ioe){
throw new Error("Problem copying database from resource file.");
}
}
public void openDatabase() throws SQLException {
//Open the database
String myPath = DATABASE_PATH + DATABASE_NAME;
myDatabase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if(myDatabase != null)
myDatabase.close();
super.close();
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// DROP OLDER TABLES IF EXISTED
db.execSQL("DROP TABLE IF EXISTS " + EXPERT_TABLE);
db.execSQL("DROP TABLE IF EXISTS " + INGREDIENTS_TABLE);
db.execSQL("DROP TABLE IF EXISTS " + MENU_TABLE);
onCreate(db);
}
public boolean insertExpertTable(String code, String name, String weighting){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL_EXPERT_CODE, code);
contentValues.put(COL_EXPERT_NAME, name);
contentValues.put(COL_EXPERT_WEIGHTING, weighting);
long result = db.insert(EXPERT_TABLE, null, contentValues);
if(result == -1)
return false;
else
return true;
}
public boolean insertIngredientsTable(String code, String codefk, String name, String qty){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL_INGREDIENTS_CODE, code);
contentValues.put(COL_INGREDIENTS_CODEFK, codefk);
contentValues.put(COL_INGREDIENTS_NAME, name);
contentValues.put(COL_INGREDIENTS_QTY, qty);
long result = db.insert(INGREDIENTS_TABLE, null, contentValues);
if(result == -1)
return false;
else
return true;
}
public boolean insertMenuTable(String code, String name, byte[] picture){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL_MENU_CODE, code);
contentValues.put(COL_MENU_NAME, name);
contentValues.put("menuPictures", picture);
long result = db.insert(MENU_TABLE, null, contentValues);
if(result == -1) {
return false;
}
else {
return true;
}
}
public Cursor getAllExpertData(){
SQLiteDatabase db = this.getWritableDatabase();
Cursor res = db.rawQuery("SELECT * FROM " + EXPERT_TABLE, null);
return res;
}
public Cursor getAllIngredientsData(){
SQLiteDatabase db = this.getWritableDatabase();
Cursor res = db.rawQuery("SELECT * FROM " + INGREDIENTS_TABLE, null);
return res;
}
public Cursor getAllMenuData(){
SQLiteDatabase db = this.getWritableDatabase();
Cursor res = db.rawQuery("SELECT * FROM " + MENU_TABLE, null);
return res;
}
public List<String> getExpertTableData(){
SQLiteDatabase db = this.getWritableDatabase();
List<String> list = new ArrayList<>();
Cursor cursor = db.rawQuery("SELECT * FROM " + EXPERT_TABLE, null);
while (cursor.moveToNext()) {
// WHICH COLUMN I WANT TO EXPORT
list.add(cursor.getString(0)+" | " + cursor.getString(1)+" | " + cursor.getString(2)+"\n" );
}
cursor.close();
return list;
}
public List<String> getIngridientsTableData(){
SQLiteDatabase db = this.getWritableDatabase();
List<String> list = new ArrayList<>();
Cursor cursor = db.rawQuery("SELECT * FROM " + INGREDIENTS_TABLE, null);
while (cursor.moveToNext()) {
// WHICH COLUMN I WANT TO EXPORT
list.add(cursor.getString(0)+" | " + cursor.getString(1)+" | " + cursor.getString(2)+"\n" );
}
cursor.close();
return list;
}
public List<Object> getMenuTableData(){
SQLiteDatabase db = this.getWritableDatabase();
List<Object> list = new ArrayList<>();
Cursor cursor = db.rawQuery("SELECT * FROM " + MENU_TABLE, null);
while (cursor.moveToNext()) {
// WHICH COLUMN I WANT TO EXPORT
list.add(cursor.getString(0)+" | " + cursor.getString(1)+" | " + cursor.getBlob(2)+"\n" );
}
cursor.close();
return list;
}
public boolean updateExpertData(String code, String name, String weighting, String change_code){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL_EXPERT_CODE, code);
contentValues.put(COL_EXPERT_NAME, name);
contentValues.put(COL_EXPERT_WEIGHTING, weighting);
contentValues.put(COL_EXPERT_CODE, change_code);
db.update(EXPERT_TABLE, contentValues, "expertCode=?",new String[] {change_code});
return true;
}
public boolean updateIngredientsData(String code, String codefk, String name, String qty, String change_code){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(COL_INGREDIENTS_CODE, code);
contentValues.put(COL_INGREDIENTS_CODEFK, codefk);
contentValues.put(COL_INGREDIENTS_NAME, name);
contentValues.put(COL_INGREDIENTS_QTY, qty);
contentValues.put(COL_INGREDIENTS_CODE, change_code);
db.update(INGREDIENTS_TABLE, contentValues, "ingridientsCode=?",new String[] {change_code});
return true;
}
// public boolean updateMenuData(String code, String name, String picture, String change_code){
// SQLiteDatabase db = this.getWritableDatabase();
//
// ContentValues contentValues = new ContentValues();
// contentValues.put(COL_MENU_CODE, code);
// contentValues.put(COL_MENU_NAME, name);
// contentValues.put(COL_MENU_PICTURE, picture);
// contentValues.put(COL_MENU_CODE, change_code);
// db.update(MENU_TABLE, contentValues, "menuCode=?",new String[] {change_code});
// return true;
// }
public Integer deleteExpertData(String change_code){
SQLiteDatabase db = this.getWritableDatabase();
return db.delete(EXPERT_TABLE, "expertCode=?", new String[] {change_code});
}
public Integer deleteIngredientsData(String change_code){
SQLiteDatabase db = this.getWritableDatabase();
return db.delete(INGREDIENTS_TABLE, "ingridientsCode=?", new String[] {change_code});
}
public Integer deleteMenuData(String change_code){
SQLiteDatabase db = this.getWritableDatabase();
return db.delete(MENU_TABLE, "menuCode=?", new String[] {change_code});
}
}
这是我的TabActivityAdministrator.java
public class TabActivityAdministrator01 extends android.support.v4.app.Fragment {
// THESE CODES BELOW UNTIL THE NEXT @OVERRIDE IS USED TO CALL THE DATABASEHELPER.JAVA
DatabaseHelper myDb;
private EditText editExpertWeightingCode,
editExpertWeightingName,
editExpertWeightingValue,
editExpertWeightingChangedCode;
private Button buttonExpertAddData,
buttonExpertViewData,
buttonExpertUpdateData,
buttonExpertDeleteData;
private ListView listViewExpertData;
// TODO: Rename and change types and number of parameters
public static TabActivityAdministrator01 newInstance(String param1, String param2) {
TabActivityAdministrator01 fragment = new TabActivityAdministrator01();
Bundle args = new Bundle();
//args.putString(ARG_PARAM1, param1);
//args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
myDb = new DatabaseHelper(getContext());
View view = inflater.inflate(R.layout.fragment_tab_activity_administrator01,container,false);
editExpertWeightingCode = (EditText)view.findViewById(R.id.edtWeightingCode_TabActivityAdministrator01);
editExpertWeightingName = (EditText)view.findViewById(R.id.edtWeightingName_TabActivityAdministrator01);
editExpertWeightingValue = (EditText)view.findViewById(R.id.edtWeightingValue_TabActivityAdministrator01);
editExpertWeightingChangedCode = (EditText)view.findViewById(R.id.edtWeightingChangedCode_TabActivityAdministrator01);
buttonExpertAddData = (Button)view.findViewById(R.id.btnExpertAddData_TabActivityAdministrator01);
buttonExpertViewData = (Button)view.findViewById(R.id.btnExpertViewData_TabActivityAdministrator01);
buttonExpertUpdateData = (Button)view.findViewById(R.id.btnExpertUpdateData_TabActivityAdministrator01);
buttonExpertDeleteData = (Button)view.findViewById(R.id.btnExpertDeleteData_TabActivityAdministrator01);
listViewExpertData = (ListView)view.findViewById(R.id.lvExpertViewData_TabActivityAdministrator01);
AddExpertData();
ViewExpertData();
UpdateExpertData();
DeleteExpertData();
return view;
}
// THESE CODES BELOW FOR ADDING EXPERT DATAS TO MY DATABASE
public void AddExpertData(){
buttonExpertAddData.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
boolean isInserted = myDb.insertExpertTable(editExpertWeightingCode.getText().toString(),
editExpertWeightingName.getText().toString(),
editExpertWeightingValue.getText().toString() );
if(isInserted = true)
Toast.makeText(TabActivityAdministrator01.this.getActivity(), "Data Berhasil Dimasukkan", Toast.LENGTH_LONG).show();
else
Toast.makeText(TabActivityAdministrator01.this.getActivity(), "Data Gagal Dimasukkan", Toast.LENGTH_LONG).show();
editExpertWeightingCode.getText().clear(); // clear edit text for expertWeightingCode
editExpertWeightingName.getText().clear(); // clear edit text for expertWeightingName
editExpertWeightingValue.getText().clear(); // clear edit text for expertWeightingValue
}
}
);
}
/*
// THESE CODES BELOW FOR VIEWING DATAS ON MY DATABASE WITH POP UP DATAS
public void ViewExpertData(){
buttonExpertViewData.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Cursor res = myDb.getAllExpertData();
if(res.getCount() == 0){
// IF NO DATA WAS FOUND, THIS MESSAGE BELOW WILL APPEAR
ShowMessage("Error", "Data Tidak Ditemukan");
return;
}
StringBuffer buffer = new StringBuffer();
while(res.moveToNext()){
buffer.append("CODE: " +res.getString(0)+"\n");
buffer.append("NAMA: " +res.getString(1)+"\n");
buffer.append("BOBOT: " +res.getString(2)+"\n\n");
}
// IF THE DATA WAS FOUND, THIS MESSAGE BELOW WILL APPEAR
ShowMessage("Data", buffer.toString());
}
}
);
}
*/
// THESE CODES BELOW FOR VIEWING DATAS ON MY DATABASE WITH POP UP DATAS // will be deleted if unused
public void ViewExpertData(){
buttonExpertViewData.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Cursor res = myDb.getAllExpertData();
if(res.getCount() == 0){
// IF NO DATA WAS FOUND, THIS MESSAGE BELOW WILL APPEAR
ShowMessage("Error", "Data Tidak Ditemukan");
return;
}
while(res.moveToNext()){
myDb = new DatabaseHelper(getActivity());
List<String> yukmasak = myDb.getExpertTableData();
myDb.closeDB();
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, yukmasak);
listViewExpertData.setAdapter(adapter);
}
}
}
);
}
public void ShowMessage(String title, String message){
AlertDialog.Builder builder = new AlertDialog.Builder(this.getActivity());
builder.setCancelable(true);
builder.setTitle(title);
builder.setMessage(message);
builder.show();
}
// THESE CODES BELOW FOR UPDATING DATAS ON MY DATABASE
public void UpdateExpertData(){
buttonExpertUpdateData.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View view) {
boolean isUpdated = myDb.updateExpertData(editExpertWeightingCode.getText().toString(),
editExpertWeightingName.getText().toString(),
editExpertWeightingValue.getText().toString(),
editExpertWeightingChangedCode.getText().toString());
if(isUpdated=true)
Toast.makeText(TabActivityAdministrator01.this.getActivity(), "Data Berhasil Diperbaharui", Toast.LENGTH_LONG).show();
else
Toast.makeText(TabActivityAdministrator01.this.getActivity(), "Data Gagal Diperbaharui", Toast.LENGTH_LONG).show();
editExpertWeightingCode.getText().clear(); // clear edit text for expertWeightingCode
editExpertWeightingName.getText().clear(); // clear edit text for expertWeightingName
editExpertWeightingValue.getText().clear(); // clear edit text for expertWeightingValue
editExpertWeightingChangedCode.getText().clear(); // clear edit text for expertWeightinChangedgCode
}
}
);
}
// THESE CODES BELOW FOR DELETING DATAS ON MY DATABASE
public void DeleteExpertData(){
buttonExpertDeleteData.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View view) {
Integer deletedRows = myDb.deleteExpertData(editExpertWeightingChangedCode.getText().toString());
if(deletedRows > 0)
Toast.makeText(TabActivityAdministrator01.this.getActivity(), "Data Berhasil Dihapus", Toast.LENGTH_LONG).show();
else
Toast.makeText(TabActivityAdministrator01.this.getActivity(), "Data Gagal Dihapus", Toast.LENGTH_LONG).show();
editExpertWeightingChangedCode.getText().clear(); // clear edit text for expertWeightinChangedgCode
}
}
);
}
}