Android平台上的sqlite数据库问题

Question

i am developing an application which uses sqlite db for storing records. I am developing this application on SDK 1.5.. when i test the application on 1.5 device it works good but when i try to run it on a 1.6 device i get a force close message with following logcat output:

03-19 09:31:35.206: ERROR/AndroidRuntime(224): Uncaught handler: thread main exiting due to uncaught exception

03-19 09:31:35.226: ERROR/AndroidRuntime(224): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.abc.android/com.abc.android.app}: android.database.sqlite.SQLiteException: unable to open database file

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2454)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2470)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.ActivityThread.access$2200(ActivityThread.java:119)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1821)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.os.Handler.dispatchMessage(Handler.java:99)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.os.Looper.loop(Looper.java:123)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.ActivityThread.main(ActivityThread.java:4310)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at java.lang.reflect.Method.invokeNative(Native Method)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at java.lang.reflect.Method.invoke(Method.java:521) 03-19 09:31:35.226: ERROR/AndroidRuntime(224): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at dalvik.system.NativeStart.main(Native Method)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): Caused by: android.database.sqlite.SQLiteException: unable to open database file

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.database.sqlite.SQLiteDatabase.dbopen(Native Method)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.database.sqlite.SQLiteDatabase.(SQLiteDatabase.java:1697)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:738)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:760)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:753)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.ApplicationContext.openOrCreateDatabase(ApplicationContext.java:473)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:193)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:98)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at com.abc.android.DbAdapter.open(DbAdapter.java:101)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at com.abc.android.class1.onCreate(class1.java:105)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2417)

03-19 09:31:35.226: ERROR/AndroidRuntime(224): ... 11 more

DBAdapter.java

public DbAdapter open() throws SQLException {

        Log.d("DbAdapter", "in DbAdapter open()");

        mDbHelper = new DatabaseHelper(mCtx);
        mDb = mDbHelper.getWritableDatabase();        // line 101
        return this;
    }

 DatabaseHelper(Context context) {
 super(context, DATABASE_NAME, null, DATABASE_VERSION); 
 }

 @Override
 public void onCreate(SQLiteDatabase db) {
    db.execSQL(DATABASE_QUERY);
 }              

class1.java

mDB = new DbAdapter(Class1.this);
mDB.open();             // line 105

Please help..what do i do????

Answer 1

Make sure DATABASE_NAME contains a value that is just a file name and nothing more, no slashes, etc.

Like this: final String DATABASE_NAME = "mydata.db";

And if that looks good, uninstall your app from the phone applications menu and re-install it.