i want to fetch database records wit htis method and stor in an object:
SQLiteDatabase db = openOrCreateDatabase("lingodb",MODE_PRIVATE, null);
Cursor cur;
cur = db.rawQuery("Select * from lingo where stage='1'", null);
cur.moveToFirst();
int n=0;
while (!cur.isAfterLast()) {
words_array[n].word = cur.getString(cur.getColumnIndex("word"));
words_array[n].pack = cur.getInt(cur.getColumnIndex("stage"));
words_array[n].id = cur.getInt(cur.getColumnIndex("pack_id"));
n=n+1;
cur.moveToNext();
}
cur.close();
db.close();
my information in db is valid but this code provide this error:
04-26 23:15:52.090: E/AndroidRuntime(22002): FATAL EXCEPTION: main
04-26 23:15:52.090: E/AndroidRuntime(22002): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.english.game/com.english.game.MainActivity}: java.lang.NullPointerException
04-26 23:15:52.090: E/AndroidRuntime(22002): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
04-26 23:15:52.090: E/AndroidRuntime(22002): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-26 23:15:52.090: E/AndroidRuntime(22002): at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-26 23:15:52.090: E/AndroidRuntime(22002): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-26 23:15:52.090: E/AndroidRuntime(22002): at android.os.Handler.dispatchMessage(Handler.java:99)
04-26 23:15:52.090: E/AndroidRuntime(22002): at android.os.Looper.loop(Looper.java:137)
04-26 23:15:52.090: E/AndroidRuntime(22002): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-26 23:15:52.090: E/AndroidRuntime(22002): at java.lang.reflect.Method.invokeNative(Native Method)
04-26 23:15:52.090: E/AndroidRuntime(22002): at java.lang.reflect.Method.invoke(Method.java:511)
04-26 23:15:52.090: E/AndroidRuntime(22002): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-26 23:15:52.090: E/AndroidRuntime(22002): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-26 23:15:52.090: E/AndroidRuntime(22002): at dalvik.system.NativeStart.main(Native Method)
04-26 23:15:52.090: E/AndroidRuntime(22002): Caused by: java.lang.NullPointerException
04-26 23:15:52.090: E/AndroidRuntime(22002): at com.english.game.MainActivity.onCreate(MainActivity.java:75)
04-26 23:15:52.090: E/AndroidRuntime(22002): at android.app.Activity.performCreate(Activity.java:5104)
04-26 23:15:52.090: E/AndroidRuntime(22002): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
04-26 23:15:52.090: E/AndroidRuntime(22002): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
why this happen?