Android 指定的目录或数据库文件不存在
我在android项目上工作了多年，我总是使用数据库处理程序的代码来设置sqlite数据库，但这些天我在新的笔记本电脑上安装了android studio并开始运行我的项目，但一旦应用程序启动，我会收到以下错误消息：Android 指定的目录或数据库文件不存在,android,database,sqlite,Android,Database,Sqlite,我在android项目上工作了多年，我总是使用数据库处理程序的代码来设置sqlite数据库，但这些天我在新的笔记本电脑上安装了android studio并开始运行我的项目，但一旦应用程序启动，我会收到以下错误消息： 08-26 13:41:51.044 16032-16032/com.nileworx.flagsquiz E/SQLiteLog: (28) failed to open "/data/data/com.nileworx.flagsquiz/databases/FlagsQuiz
08-26 13:41:51.044 16032-16032/com.nileworx.flagsquiz E/SQLiteLog: (28) failed to open "/data/data/com.nileworx.flagsquiz/databases/FlagsQuiz" with flag (131072) and mode_t (0) due to error (2)
(14) cannot open file at line 32561 of [a66a5b397b]
(14) os_unix.c:32561: (2) open(/data/data/com.nileworx.flagsquiz/databases/FlagsQuiz) -
08-26 13:41:51.054 16032-16032/com.nileworx.flagsquiz E/SQLiteDatabase: Failed to open database '/data/data/com.nileworx.flagsquiz/databases/FlagsQuiz'.
android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 1294): Could not open database
#################################################################
Error Code : 1294 (SQLITE_CANTOPEN_ENOENT)
Caused By : Specified directory or database file does not exist.
(unknown error (code 1294): Could not open database)
#################################################################
at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:301)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:220)
at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:512)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:206)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:178)
at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:908)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:878)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:699)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:674)
at com.nileworx.flagsquiz.DataBaseHandler.checkDataBase(DataBaseHandler.java:86)
at com.nileworx.flagsquiz.DataBaseHandler.createDataBase(DataBaseHandler.java:47)
at com.nileworx.flagsquiz.DAO.<init>(DAO.java:52)
at com.nileworx.flagsquiz.CustomDialog.<init>(CustomDialog.java:46)
at com.nileworx.flagsquiz.MainActivity.onCreate(MainActivity.java:73)
at android.app.Activity.performCreate(Activity.java:6609)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1134)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3113)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3275)
at android.app.ActivityThread.access$1000(ActivityThread.java:218)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1744)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:7007)
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:1404)
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.nileworx.flagsquiz"
android:versionCode="7"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@drawable/app_icon"
android:label="@string/app_name"
tools:replace="android:label"
android:largeHeap="true"
android:theme="@style/AppTheme" >
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<meta-data
android:name="com.google.android.gms.games.APP_ID"
android:value="@string/app_id" />
<activity
android:name="com.nileworx.flagsquiz.MainActivity"
android:label="@string/app_name"
android:screenOrientation="portrait" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.nileworx.flagsquiz.UpdatesDialogActivity"
android:label="@string/app_name"
android:screenOrientation="portrait"
android:theme="@android:style/Theme.Dialog" >
</activity>
<activity
android:name="com.nileworx.flagsquiz.GameActivity"
android:label="@string/app_name"
android:screenOrientation="portrait" >
</activity>
<activity
android:name="com.nileworx.flagsquiz.SettingsActivity"
android:label="@string/app_name"
android:screenOrientation="portrait" >
</activity>
<activity
android:name="com.google.android.gms.ads.AdActivity"
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize" />
<service android:name="com.nileworx.flagsquiz.GetUpdatesService" >
</service>
<service android:name="com.nileworx.flagsquiz.CheckUpdatesService" >
</service>
</application>
</manifest>
提前谢谢 根据您的代码，这是意料之中的。它将在checkDatabase中的open中引发异常。它说数据库文件还不存在。如果这是一个新安装，那将是正确的。你甚至在编写代码来期待这个-看到你的catch语句了吗？这就是你如何判断db是否是新的
这里没什么问题。这将在任何设备上第一次打印出来，并且仍然有效。如果要删除该消息，请从catch语句中删除日志记录。您的代码似乎没有问题 我已经复制了您提供的所有代码，并尝试重新创建您所遇到的错误 首先，您显示的堆栈跟踪是预期的，因为这是在checkDB方法中使用时不可避免的通过捕获捕获捕获的结果：-
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
08-29 01:01:19.323 2602-2602/? D/CHKDB: Issuing openDatabase for path :- /data/data/so52053932.so52053932/databases/FlagsQuiz
08-29 01:01:19.331 2602-2602/? E/SQLiteLog: (14) cannot open file at line 30174 of [00bb9c9ce4]
(14) os_unix.c:30174: (2) open(/data/data/so52053932.so52053932/databases/FlagsQuiz) -
08-29 01:01:19.331 2602-2602/? E/SQLiteDatabase: Failed to open database '/data/data/so52053932.so52053932/databases/FlagsQuiz'.
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:804)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
at so52053932.so52053932.DataBaseHandler.checkDataBase(DataBaseHandler.java:89)
at so52053932.so52053932.DataBaseHandler.createDataBase(DataBaseHandler.java:48)
at so52053932.so52053932.DAO.<init>(DAO.java:17)
at so52053932.so52053932.MainActivity.onCreate(MainActivity.java:18)
at android.app.Activity.performCreate(Activity.java:5008)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
08-29 01:01:19.331 2602-2602/? D/CHECKDB: SQLiteException has bee caught.
08-29 01:01:19.339 2602-2602/? D/ONCREATE: New Database has been created so ONCREATE has been invoked.
08-29 01:01:19.339 2602-2602/? D/CPYDB: Database Copy Initiated. Trying to open InputStream i.e. asset database/FlagsQuiz
08-29 01:01:19.339 2602-2602/? W/System.err: java.io.FileNotFoundException: database/FlagsQuiz
at android.content.res.AssetManager.openAsset(Native Method)
at android.content.res.AssetManager.open(AssetManager.java:315)
at android.content.res.AssetManager.open(AssetManager.java:289)
at so52053932.so52053932.DataBaseHandler.copyDataBase(DataBaseHandler.java:119)
at so52053932.so52053932.DataBaseHandler.createDataBase(DataBaseHandler.java:62)
at so52053932.so52053932.DAO.<init>(DAO.java:17)
at so52053932.so52053932.MainActivity.onCreate(MainActivity.java:18)
at android.app.Activity.performCreate(Activity.java:5008)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
08-29 01:01:19.347 2602-2602/? W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
08-29 01:01:19.347 2602-2602/? D/AndroidRuntime: Shutting down VM
08-29 01:01:19.347 2602-2602/? W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0xa62a0288)
08-29 01:01:19.347 2602-2602/? E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.Error: Error copying database
at so52053932.so52053932.DataBaseHandler.createDataBase(DataBaseHandler.java:67)
at so52053932.so52053932.DAO.<init>(DAO.java:17)
at so52053932.so52053932.MainActivity.onCreate(MainActivity.java:18)
at android.app.Activity.performCreate(Activity.java:5008)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
08-29 01:14:06.139 2699-2699/? D/CHKDB: Issuing openDatabase for path :- /data/data/so52053932.so52053932/databases/FlagsQuiz
08-29 01:14:06.139 2699-2699/? E/SQLiteLog: (14) cannot open file at line 30174 of [00bb9c9ce4]
(14) os_unix.c:30174: (2) open(/data/data/so52053932.so52053932/databases/FlagsQuiz) -
08-29 01:14:06.139 2699-2699/? E/SQLiteDatabase: Failed to open database '/data/data/so52053932.so52053932/databases/FlagsQuiz'.
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:804)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
at so52053932.so52053932.DataBaseHandler.checkDataBase(DataBaseHandler.java:89)
at so52053932.so52053932.DataBaseHandler.createDataBase(DataBaseHandler.java:48)
at so52053932.so52053932.DAO.<init>(DAO.java:17)
at so52053932.so52053932.MainActivity.onCreate(MainActivity.java:18)
at android.app.Activity.performCreate(Activity.java:5008)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
08-29 01:14:06.139 2699-2699/? D/CHECKDB: SQLiteException has bee caught.
08-29 01:14:06.151 2699-2699/? D/ONCREATE: New Database has been created so ONCREATE has been invoked.
08-29 01:14:06.151 2699-2699/? D/CPYDB: Database Copy Initiated. Trying to open InputStream i.e. asset database/FlagsQuiz
InputStream Opened successfully. Now trying to open OutputStream path = /data/data/so52053932.so52053932/databases/FlagsQuiz
OutputStream Opened successfully. Now trying to copy from InputStream to OutputStream.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Copied 1024 bytes.
Completed Copy from asset to DB. Flusing and closing Streams
Copy complete and all sterams flushed and closed. Copied -1bytes.
08-29 01:14:06.151 2699-2699/? D/DAO: Attempting to open the database.
08-29 01:14:06.159 2699-2699/? D/COMPONENTS: Found android_metadata Type is table
Found PrivateList Type is table
Found PrivateProduct Type is table
Found List_Product Type is table
Found sqlite_autoindex_List_Product_1 Type is index
08-29 01:01:19.323 2602-2602/? D/CHKDB: Issuing openDatabase for path :- /data/data/so52053932.so52053932/databases/FlagsQuiz
08-29 01:01:19.331 2602-2602/? E/SQLiteLog: (14) cannot open file at line 30174 of [00bb9c9ce4]
(14) os_unix.c:30174: (2) open(/data/data/so52053932.so52053932/databases/FlagsQuiz) -
08-29 01:01:19.331 2602-2602/? E/SQLiteDatabase: Failed to open database '/data/data/so52053932.so52053932/databases/FlagsQuiz'.
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:804)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
at so52053932.so52053932.DataBaseHandler.checkDataBase(DataBaseHandler.java:89)
at so52053932.so52053932.DataBaseHandler.createDataBase(DataBaseHandler.java:48)
at so52053932.so52053932.DAO.<init>(DAO.java:17)
at so52053932.so52053932.MainActivity.onCreate(MainActivity.java:18)
at android.app.Activity.performCreate(Activity.java:5008)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
08-29 01:01:19.331 2602-2602/? D/CHECKDB: SQLiteException has bee caught.
08-29 01:01:19.339 2602-2602/? D/ONCREATE: New Database has been created so ONCREATE has been invoked.
08-29 01:01:19.339 2602-2602/? D/CPYDB: Database Copy Initiated. Trying to open InputStream i.e. asset database/FlagsQuiz
08-29 01:01:19.339 2602-2602/? W/System.err: java.io.FileNotFoundException: database/FlagsQuiz
at android.content.res.AssetManager.openAsset(Native Method)
at android.content.res.AssetManager.open(AssetManager.java:315)
at android.content.res.AssetManager.open(AssetManager.java:289)
at so52053932.so52053932.DataBaseHandler.copyDataBase(DataBaseHandler.java:119)
at so52053932.so52053932.DataBaseHandler.createDataBase(DataBaseHandler.java:62)
at so52053932.so52053932.DAO.<init>(DAO.java:17)
at so52053932.so52053932.MainActivity.onCreate(MainActivity.java:18)
at android.app.Activity.performCreate(Activity.java:5008)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
08-29 01:01:19.347 2602-2602/? W/System.err: at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
08-29 01:01:19.347 2602-2602/? D/AndroidRuntime: Shutting down VM
08-29 01:01:19.347 2602-2602/? W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0xa62a0288)
08-29 01:01:19.347 2602-2602/? E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.Error: Error copying database
at so52053932.so52053932.DataBaseHandler.createDataBase(DataBaseHandler.java:67)
at so52053932.so52053932.DAO.<init>(DAO.java:17)
at so52053932.so52053932.MainActivity.onCreate(MainActivity.java:18)
at android.app.Activity.performCreate(Activity.java:5008)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
08-29 01:14:06.139 2699-2699/? D/CHKDB: Issuing openDatabase for path :- /data/data/so52053932.so52053932/databases/FlagsQuiz
08-29 01:14:06.139 2699-2699/? E/SQLiteLog: (14) cannot open file at line 30174 of [00bb9c9ce4]
(14) os_unix.c:30174: (2) open(/data/data/so52053932.so52053932/databases/FlagsQuiz) -
08-29 01:14:06.139 2699-2699/? E/SQLiteDatabase: Failed to open database '/data/data/so52053932.so52053932/databases/FlagsQuiz'.
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:804)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
at so52053932.so52053932.DataBaseHandler.checkDataBase(DataBaseHandler.java:89)
at so52053932.so52053932.DataBaseHandler.createDataBase(DataBaseHandler.java:48)
at so52053932.so52053932.DAO.<init>(DAO.java:17)
at so52053932.so52053932.MainActivity.onCreate(MainActivity.java:18)
at android.app.Activity.performCreate(Activity.java:5008)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
08-29 01:14:06.139 2699-2699/? D/CHECKDB: SQLiteException has bee caught.
08-29 01:14:06.151 2699-2699/? D/ONCREATE: New Database has been created so ONCREATE has been invoked.
08-29 01:14:06.151 2699-2699/? D/CPYDB: Database Copy Initiated. Trying to open InputStream i.e. asset database/FlagsQuiz
InputStream Opened successfully. Now trying to open OutputStream path = /data/data/so52053932.so52053932/databases/FlagsQuiz
OutputStream Opened successfully. Now trying to copy from InputStream to OutputStream.
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Completed Copy from asset to DB. Flusing and closing Streams
Copy complete and all sterams flushed and closed. Copied -1bytes.
08-29 01:14:06.151 2699-2699/? D/DAO: Attempting to open the database.
08-29 01:14:06.159 2699-2699/? D/COMPONENTS: Found android_metadata Type is table
Found PrivateList Type is table
Found PrivateProduct Type is table
Found List_Product Type is table
Found sqlite_autoindex_List_Product_1 Type is index
你能在这里添加你的清单文件吗？你听说过google room吗？如果你愿意接受一种更简单的方法，你可以尝试一下sqlite@LokeshDesai我把它加上去了。。检查编辑是否处理写入外部存储的运行时权限？@Dr.aNdRO实际上我以前没有听说过。。我想先知道为什么会出现这个错误？？是关于新的android api级别还是什么？因为我总是使用这种方法，但我尝试再次打开它很多次，当你在其他地方发生崩溃时，应用程序仍然崩溃并被迫关闭。这并没有让你崩溃。
public class DataBaseHandler extends SQLiteOpenHelper {
// The Androids default system path of your application database.
private static String DB_PATH;
private static String DB_NAME = "FlagsQuiz";
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 DataBaseHandler(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
DB_PATH = context.getDatabasePath(DB_NAME).toString();
// Log.e("path", DB_PATH);
}
// ==============================================================================
/**
* 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.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
e.printStackTrace(); //<<<<< ADDED
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() {
SQLiteDatabase checkDB = null;
try {
String myPath = DB_PATH;
Log.d("CHKDB","Issuing openDatabase for path :- " + myPath); //<<<<< ADDED
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
boolean checkresult = checkDB != null; //<<<<< ADDED
Log.d("CHKDB", "Result of check is " + String.valueOf(checkresult)); //<<<<< ADDED
} catch (SQLiteException e) {
Log.d("CHECKDB", "SQLiteException has bee caught."); //<<<<< ADDED
// database does't exist yet.
}
if (checkDB != null) {
Log.d("CHECKDB","DB exists so closing the opened DB."); //<<<<< ADDED
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 {
Log.d("CPYDB","Database Copy Initiated. Trying to open InputStream i.e. asset " + "database/" + DB_NAME); //<<<<< ADDED
// Open your local db as the input stream
InputStream myInput = myContext.getAssets().open("database/" + DB_NAME);
Log.d("CPYDB","InputStream Opened successfully. Now trying to open OutputStream path = " + DB_PATH); //<<<<< ADDED
// Path to the just created empty db
String outFileName = DB_PATH;
// Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
Log.d("CPYDB","OutputStream Opened successfully. Now trying to copy from InputStream to OutputStream."); //<<<<< ADDED
// 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);
Log.d("CPYDB","Copied " + String.valueOf(length) + " bytes."); //<<<<< ADDED
}
Log.d("CPYDB","Completed Copy from asset to DB. Flusing and closing Streams"); //<<<<< ADDED
// Close the streams
myOutput.flush();
myOutput.close();
myInput.close();
Log.d("CPYDB","Copy complete and all sterams flushed and closed. Copied " + String.valueOf(length) + "bytes."); //<<<<< ADDED
}
// ==============================================================================
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) {
Log.d("ONCREATE","New Database has been created so ONCREATE has been invoked."); //<<<<< ADDED
}
// ==============================================================================
@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.
}
public class MainActivity extends AppCompatActivity {
DAO myDAO;
DataBaseHandler myDBhandler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myDAO = new DAO(this);
myDBhandler = myDAO.dbHandler;
SQLiteDatabase db = myDBhandler.getWritableDatabase();
Cursor csr = db.query("sqlite_master",null,null,null,null,null,null);
while (csr.moveToNext()) {
Log.d("COMPONENTS","Found " + csr.getString(csr.getColumnIndex("name")) + " Type is " + csr.getString(csr.getColumnIndex("type")));
}
csr.close();
}
}
08-29 01:14:06.139 2699-2699/? D/CHKDB: Issuing openDatabase for path :- /data/data/so52053932.so52053932/databases/FlagsQuiz
08-29 01:14:06.139 2699-2699/? E/SQLiteLog: (14) cannot open file at line 30174 of [00bb9c9ce4]
(14) os_unix.c:30174: (2) open(/data/data/so52053932.so52053932/databases/FlagsQuiz) -
08-29 01:14:06.139 2699-2699/? E/SQLiteDatabase: Failed to open database '/data/data/so52053932.so52053932/databases/FlagsQuiz'.
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:804)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
at so52053932.so52053932.DataBaseHandler.checkDataBase(DataBaseHandler.java:89)
at so52053932.so52053932.DataBaseHandler.createDataBase(DataBaseHandler.java:48)
at so52053932.so52053932.DAO.<init>(DAO.java:17)
at so52053932.so52053932.MainActivity.onCreate(MainActivity.java:18)
at android.app.Activity.performCreate(Activity.java:5008)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
at android.app.ActivityThread.access$600(ActivityThread.java:130)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
08-29 01:14:06.139 2699-2699/? D/CHECKDB: SQLiteException has bee caught.
08-29 01:14:06.151 2699-2699/? D/ONCREATE: New Database has been created so ONCREATE has been invoked.
08-29 01:14:06.151 2699-2699/? D/CPYDB: Database Copy Initiated. Trying to open InputStream i.e. asset database/FlagsQuiz
InputStream Opened successfully. Now trying to open OutputStream path = /data/data/so52053932.so52053932/databases/FlagsQuiz
OutputStream Opened successfully. Now trying to copy from InputStream to OutputStream.
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Completed Copy from asset to DB. Flusing and closing Streams
Copy complete and all sterams flushed and closed. Copied -1bytes.
08-29 01:14:06.151 2699-2699/? D/DAO: Attempting to open the database.
08-29 01:14:06.159 2699-2699/? D/COMPONENTS: Found android_metadata Type is table
Found PrivateList Type is table
Found PrivateProduct Type is table
Found List_Product Type is table
Found sqlite_autoindex_List_Product_1 Type is index
private boolean ifDatabaseExists(String dbpath) {
File db = new File(dbpath);
if(db.exists()) return true;
File dir = new File(db.getParent());
if (!dir.exists()) {
dir.mkdirs();
}
return false;
}