我正在尝试创建数据库实例。这就是为什么我有以下ocde：
public class ContactFragment extends SherlockFragment {
private static final String THIS_FILE = "ContactFragment";
ImageButton new_contact ;
ListView listView;
ArrayAdapter arrayAdapter;
SQLiteDatabase database;
List<CONTACT_ITEM> contactBody;
int MODE_PRIVATE=1;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
database = openOrCreateDatabase("ContactDatabase",null);
// database.execSQL("CREATE TABLE if not exists constants (_id INTEGER PRIMARY KEY AUTOINCREMENT, title TEXT, number text , extension text);");
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.contactdialer, container, false);
contactBody = getReadFromDatabase();
new_contact = (ImageButton) rootView.findViewById(R.id.imageButton);
new_contact.setOnClickListener(this);
listView = (ListView) rootView.findViewById(R.id.list_view);
arrayAdapter=new ContactAdapter(getActivity(),R.layout.row_item_contact,contactBody);
listView.setAdapter(arrayAdapter);
return rootView;
}
List<CONTACT_ITEM> getReadFromDatabase()
{
List<CONTACT_ITEM> contact = new ArrayList<CONTACT_ITEM>();
return contact;
}
}
但是我在以下方面遇到了例外：
database = openOrCreateDatabase("ContactDatabase",null);
logcat给出以下异常：
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:829)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:814)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:709)
at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:724)
at com.csipsimple.ui.contacts.ContactFragment.onCreate(ContactFragment.java:38)
at android.support.v4.app.Fragment.performCreate(Fragment.java:1763)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:913)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1126)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1489)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:486)
at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441)
at android.view.View.measure(View.java:16848)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5374)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:340)
at android.view.View.measure(View.java:16848)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5374)
at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327)
at android.view.View.measure(View.java:16848)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5374)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:340)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2368)
at android.view.View.measure(View.java:16848)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2246)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1312)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1509)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1189)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6223)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:788)
at android.view.Choreographer.doCallbacks(Choreographer.java:591)
at android.view.Choreographer.doFrame(Choreographer.java:560)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:774)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5330)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:828)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:644)
at dalvik.system.NativeStart.main(Native Method)
为什么我收到此错误？我怎么解决这个问题？任何建议都有很大帮助。
答案 0 :(得分：0)
public abstract SQLiteDatabase openOrCreateDatabase（String name，int mode，SQLiteDatabase.CursorFactory factory）
打开与此Context的应用程序包关联的新私有SQLiteDatabase。如果数据库文件不存在，请创建它。
参数 name数据库的名称（在应用程序包中唯一）。 模式操作模式。使用0或MODE_PRIVATE作为默认操作，使用MODE_WORLD_READABLE和MODE_WORLD_WRITEABLE来控制权限。默认情况下，使用MODE_ENABLE_WRITE_AHEAD_LOGGING启用预写日志记录。 factory一个可选的工厂类，在调用查询时调用它来实例化游标。 返回
抛出 SQLiteException如果无法打开数据库文件。
openOrCreateDatabase（String，int，SQLiteDatabase.CursorFactory） 使用
database = openOrCreateDatabase("ContactDatabase",0);
database = openOrCreateDatabase("ContactDatabase",MODE_PRIVATE);