我在安装时创建了一个应用程序并在第一次启动它时会自动关闭，但是当它在工作正常后打开它时。如果我清除应用程序的数据，它也会第一次关闭。它显示android.database.sqlite.SQLiteCantOpenDatabaseException：未知错误（代码14）：无法打开数据库 任何人都可以帮助我的日志
11-22 23:14:56.175 13193-13193/? I/art: Late-enabling -Xcheck:jni
11-22 23:14:56.195 13193-13193/? D/TidaProvider: TidaProvider()
11-22 23:14:56.285 13193-13193/com.elytelabs.myapplication W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
11-22 23:14:56.455 13193-13193/com.elytelabs.myapplication E/SQLiteLog: (14) cannot open file at line 30052 of [b3bb660af9]
11-22 23:14:56.455 13193-13193/com.elytelabs.myapplication E/SQLiteLog: (14) os_unix.c:30052: (2) open(/data/data/com.elytelabs.myapplication/databases/dictionary.db) -
11-22 23:14:56.455 13193-13193/com.elytelabs.myapplication E/SQLiteDatabase: Failed to open database '/data/data/com.elytelabs.myapplication/databases/dictionary.db'.
android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:806)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:791)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
at com.elytelabs.myapplication.DatabaseHelper.checkDataBase(DatabaseHelper.java:85)
at com.elytelabs.myapplication.DatabaseHelper.createDataBase(DatabaseHelper.java:50)
at com.elytelabs.myapplication.MainActivity.fetchData(MainActivity.java:129)
at com.elytelabs.myapplication.MainActivity.onCreate(MainActivity.java:82)
at android.app.Activity.performCreate(Activity.java:6039)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2295)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2404)
at android.app.ActivityThread.access$900(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1315)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5296)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
11-22 23:14:56.525 13193-13193/com.elytelabs.myapplication E/SQLiteLog: (1) no such table: Dictionary1
11-22 23:14:56.525 13193-13193/com.elytelabs.myapplication D/AndroidRuntime: Shutting down VM
11-22 23:14:56.525 13193-13193/com.elytelabs.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.elytelabs.myapplication, PID: 13193
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.elytelabs.myapplication/com.elytelabs.myapplication.MainActivity}: android.database.sqlite.SQLiteException: no such table: Dictionary1 (code 1): , while compiling: SELECT * FROM Dictionary1
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2342)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2404)
at android.app.ActivityThread.access$900(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1315)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5296)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
Caused by: android.database.sqlite.SQLiteException: no such table: Dictionary1 (code 1): , while compiling: SELECT * FROM Dictionary1
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1316)
at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1163)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1034)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1202)
at com.elytelabs.myapplication.MainActivity.fetchData(MainActivity.java:142)
at com.elytelabs.myapplication.MainActivity.onCreate(MainActivity.java:82)
at android.app.Activity.performCreate(Activity.java:6039)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2295)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2404)
at android.app.ActivityThread.access$900(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1315)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5296)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
11-22 23:14:56.535 13193-13193/com.elytelabs.myapplication I/Process: Sending signal. PID: 13193 SIG: 9
这是我的代码。 数据库helper.java
public class DatabaseHelper extends SQLiteOpenHelper{
//The Android's default system path of your application database.
private static String DB_PATH = "";
private static String DB_NAME = "dictionary.db";
private SQLiteDatabase myDataBase;
private final Context myContext;
/**
* Constructor
* Takes and keeps a reference of the passed context in order to access to the application assets and resources.
* @param context
*/
public DatabaseHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
DB_PATH= myContext.getDatabasePath(DB_NAME).toString();
}
/**
* Creates a empty database on the system and rewrites it with your own database.
* */
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.getWritableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
/**
* Check if the database already exist to avoid re-copying the file each time you open the application.
* @return true if it exists, false if it doesn't
*/
private boolean checkDataBase(){
// this.getReadableDatabase();
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH ;
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;
}
/**
* Copies your database from your local assets-folder to the just created empty database in the
* system folder, from where it can be accessed and handled.
* This is done by transfering bytestream.
* */
private void copyDataBase() throws IOException{
//Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH ;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
myOutput.write(buffer, 0, length);
}
//Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
}
public void openDataBase() throws SQLException{
//Open the database
String myPath = DB_PATH ;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if(myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
// Add your public helper methods to access and get content from the database.
// You could return cursors by doing "return myDataBase.query(....)" so it'd be easy
// to you to create adapters for your views.
//add your public methods for insert, get, delete and update data in database.
}
这是我的主要活动.java
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private AdView mAdView;
private static RecyclerView.Adapter adapter;
private RecyclerView.LayoutManager layoutManager;
private static RecyclerView recyclerView;
public static ArrayList<DictObjectModel> data;
DatabaseHelper db ;
ArrayList<String> wordcombimelist;
ArrayList<String> meancombimelist;
LinkedHashMap<String,String> namelist;
SearchView searchView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
recyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
recyclerView.setHasFixedSize(true);
db= new DatabaseHelper(this);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
data = new ArrayList<DictObjectModel>();
fetchData();
// Banner Ads
mAdView = (AdView) findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
mAdView.loadAd(adRequest);
}
public void fetchData()
{
db =new DatabaseHelper(this);
try {
db.createDataBase();
db.openDataBase();
}
catch (Exception e)
{
e.printStackTrace();
}
namelist=new LinkedHashMap<>();
int ii;
SQLiteDatabase sd = db.getReadableDatabase();
Cursor cursor = sd.query("Dictionary1" ,null, null, null, null, null, null);
ii=cursor.getColumnIndex("word");
wordcombimelist=new ArrayList<String>();
meancombimelist= new ArrayList<String>();
while (cursor.moveToNext()){
namelist.put(cursor.getString(ii), cursor.getString(cursor.getColumnIndex("definition")));
}
Iterator entries = namelist.entrySet().iterator();
while (entries.hasNext()) {
Map.Entry thisEntry = (Map.Entry) entries.next();
wordcombimelist.add(String.valueOf(thisEntry.getKey()));
meancombimelist.add("- "+String.valueOf(thisEntry.getValue()));
}
for (int i = 0; i < wordcombimelist.size(); i++) {
data.add(new DictObjectModel(wordcombimelist.get(i), meancombimelist.get(i)));
}
adapter = new CustomAdapter(data);
recyclerView.setAdapter(adapter);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
final MenuItem item = menu.findItem(R.id.menu_search);
final SearchView searchView = (SearchView)
MenuItemCompat.getActionView(item);
searchView.setQueryRefinementEnabled(true);
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {return false; }
@Override
public boolean onQueryTextChange(String newText) {
newText = newText.toLowerCase();
final ArrayList<DictObjectModel> filteredList = new ArrayList<DictObjectModel>();
for (int i = 0; i < wordcombimelist.size(); i++) {
final String text = wordcombimelist.get(i).toLowerCase();
if (text.contains(newText)) {
filteredList.add(new DictObjectModel(wordcombimelist.get(i),meancombimelist.get(i)));
}
}
adapter = new CustomAdapter(filteredList);
recyclerView.setAdapter(adapter);
return true;
}
});
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
return false;
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
答案 0 :(得分：0)
试试这段代码，
public class DatabaseHelper extends SQLiteOpenHelper{
private static String DB_NAME = "dictionary.db";
private SQLiteDatabase myDataBase;
private final Context myContext;
/**
* Constructor
* Takes and keeps a reference of the passed context in order to access to the application assets and resources.
*/
public DatabaseHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
}
@Override
public void onCreate(SQLiteDatabase db) {
//write code create table.
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion{
}
// Add your public helper methods to access and get content from the database.
// You could return cursors by doing "return myDataBase.query(....)" so it'd be easy
// to you to create adapters for your views.
//add your public methods for insert, get, delete and update data in database.
}
答案 1 :(得分：0)
你可以像下面这样尝试..如果添加任何表只需更改VERSION代码。这意味着如果添加新表，则必须将 VERSION = 1 更改为 VERSION = 2 。
public class DatabaseHelper extends SQLiteOpenHelper {
private static final String DBNAME = "yourdbname.db";
private static final int VERSION = 1;
public DatabaseHelper(Context context) {
super(context, DBNAME, null, VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table tablename(tablename_id integer primary key autoincrement,name text)");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS tablename");
onCreate(db);
}
}
答案 2 :(得分：0)
我认为数据库实际上已成功复制和加载（打开），而且问题是复制的数据库在尝试以下操作时没有名为Dictionary1的表： - < / p>
Cursor cursor = sd.query("Dictionary1" ,null, null, null, null, null, null);
根据at com.elytelabs.myapplication.MainActivity.fetchData(MainActivity.java:142)
因此，您需要根据复制数据库中的表格更正表名。
您可能希望使用this Q&A来显示数据库信息。
消息： -
11-22 23:14:56.455 13193-13193/com.elytelabs.myapplication E/SQLiteLog: (14) cannot open file at line 30052 of [b3bb660af9]
11-22 23:14:56.455 13193-13193/com.elytelabs.myapplication E/SQLiteLog: (14) os_unix.c:30052: (2) open(/data/data/com.elytelabs.myapplication/databases/dictionary.db) -
11-22 23:14:56.455 13193-13193/com.elytelabs.myapplication E/SQLiteDatabase: Failed to open database '/data/data/com.elytelabs.myapplication/databases/dictionary.db'.
android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
etc .........
调用checkDatabase方法时的结果，因为数据库当时没有找到，因为它没有从资产中复制（应该这样做）。
该方法使用getReadableDatabase方法尝试查看数据库是否存在。此方法始终打印堆栈跟踪。
另一种方法可能是取代： -
private boolean checkDataBase(){
// this.getReadableDatabase();
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH ;
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;
}
： -
private boolean checkDataBase(){
File db = new File(DB_PATH);
if(db.exists()) return true;
File dir = new File(db.getParent());
if (!dir.exists()) {
dir.mkdirs();
}
return false;
}
这会尝试查看数据库文件是否存在（并且还在路径中创建了一个不存在的目录，例如在某些情况下，数据库目录可能不存在。）
如果使用上述内容，那么您的消息更像是： -
11-22 23:14:56.525 13193-13193/com.elytelabs.myapplication E/SQLiteLog: (1) no such table: Dictionary1
11-22 23:14:56.525 13193-13193/com.elytelabs.myapplication D/AndroidRuntime: Shutting down VM
11-22 23:14:56.525 13193-13193/com.elytelabs.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.elytelabs.myapplication, PID: 13193
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.elytelabs.myapplication/com.elytelabs.myapplication.MainActivity}: android.database.sqlite.SQLiteException: no such table: Dictionary1 (code 1): , while compiling: SELECT * FROM Dictionary1
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2342)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2404)
at android.app.ActivityThread.access$900(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1315)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5296)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
Caused by: android.database.sqlite.SQLiteException: no such table: Dictionary1 (code 1): , while compiling: SELECT * FROM Dictionary1
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1316)
at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1163)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1034)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1202)
at com.elytelabs.myapplication.MainActivity.fetchData(MainActivity.java:142)
at com.elytelabs.myapplication.MainActivity.onCreate(MainActivity.java:82)