2020-01-01 23:58:29.869 17144-17144/com.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.myapplication, PID: 17144
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myapplication/com.example.myapplication.loginActivity}: android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: 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:808)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:793)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:696)
at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:680)
at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:289)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:223)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163)
at com.example.myapplication.DBdao.<init>(DBdao.java:14)
at com.example.myapplication.loginActivity.onCreate(loginActivity.java:57)
at android.app.Activity.performCreate(Activity.java:6664)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
uj5u.com熱心網友回復：
DBopenHelper中的資料名稱只能傳相對路徑，不過你可以自定義一個ContextWrapper來處理你的路徑。
public class DatabaseContext extends ContextWrapper {
public DatabaseContext(Context base) {
super(base);
}
@Override
public File getDatabasePath(String name) {
if (name.startsWith(Environment.getExternalStorageDirectory().getAbsolutePath())){
// 以sd卡開頭，自己的處理
} else {
// 自己的處理
}
return super.getDatabasePath(name);
}
@Override
public SQLiteDatabase openOrCreateDatabase(String name, int mode,
SQLiteDatabase.CursorFactory factory,
DatabaseErrorHandler errorHandler) {
return openOrCreateDatabase(name, mode, factory);
}
@Override
public SQLiteDatabase openOrCreateDatabase(String name, int mode,
SQLiteDatabase.CursorFactory factory) {
return SQLiteDatabase.openOrCreateDatabase(
getDatabasePath(name), null);
}
}
自定義Sqlite就nHelper時，把context轉為自定義的
*/
public class CustomDbHelper extends SQLiteOpenHelper {
public CustomDbHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
super(new DatabaseContext(context), name, factory, version);
}
…………
}
需要注意的是，如果你用sd卡的資料庫，需要處理好存盤卡權限
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標籤：Android
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