public class MainActivity extends ActionBarActivity {
public Button ok;
public EditText name;
public ListView listView;
BaseAdapter baseAdapter;
ArrayList<item> arrayList;
View view;
DataBaseHelper dBaseHelper;
item item;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 0);
setContentView(R.layout.activity_main);
InitializedAll();
ok.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
save(view);
show(view);
}
});
}
private void InitializedAll() {
dBaseHelper = new DataBaseHelper(this);
item item = new item();
name = (EditText) findViewById(R.id.nameeditText);
ok = (Button) findViewById(R.id.okbutton);
listView = (ListView) findViewById(R.id.listView);
arrayList = new ArrayList<item>();
baseAdapter = new BaseAdapter() {
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
@Override
public View getView(int position, View view, ViewGroup arg2) {
if (view == null) {
view = inflater.inflate(R.layout.item_list, null);
}
TextView name = (TextView) view.findViewById(R.id.nametextView);
TextView pass = (TextView) view
.findViewById(R.id.passwordtextView);
name.setText(arrayList.get(position).getName());
Date date = arrayList.get(position).getDate();
pass.setText(DateFormat.format("dd/MM/yyyy HH:mm:ss a", date));
return view;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return arrayList.get(position);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return arrayList.size();
}
};
listView.setAdapter(baseAdapter);
}
public void save(View view) {
String na = name.getText().toString();
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss a");
String dateString = sdf.format(item.getDate());
item listItem = new item(na, dateString);
arrayList.add(listItem);
long inserted = dBaseHelper.insertItem(listItem);
if (inserted >= 0) {
Toast.makeText(getApplicationContext(), "Data Inserted",
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(), "Data not Inserted",
Toast.LENGTH_SHORT).show();
}
baseAdapter.notifyDataSetChanged();
}
public void show(View view) {
ArrayList<item> items = dBaseHelper.getAllDate();
if (items != null && items.size() > 0) {
baseAdapter.notifyDataSetChanged();
}
}
}
DataBaseHelper class
public class DataBaseHelper extends SQLiteOpenHelper {
public static final String DB_NAME = "task_management";
public static final int DB_VERSION = 1;
public static final String EMPLOYEE_TABLE = "employee";
public static final String ID_FIELD = "_id";
public static final String NAME_FIELD = "name";
public static final String EMAIL_FIELD = "email";
public static final String EMPLOYEE_TABLE_SQL = "CREATE TABLE "
+ EMPLOYEE_TABLE + " (" + ID_FIELD + " INTEGER PRIMARY KEY, "
+ NAME_FIELD + " TEXT, " + EMAIL_FIELD + " DATETIME);";
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(EMPLOYEE_TABLE_SQL);
Log.e("CREATE TABLE", EMPLOYEE_TABLE_SQL);
}
@Override
public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
// TODO Auto-generated method stub
}
public long insertItem(item item) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(NAME_FIELD, item.getName());
values.put(EMAIL_FIELD, item.getPassword());
long inserted = db.insert(EMPLOYEE_TABLE, null, values);
db.close();
return inserted;
}
public ArrayList<item> getAllDate() {
ArrayList<item> items = new ArrayList<>();
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(EMPLOYEE_TABLE, null, null, null, null, null,
null, null);
if (cursor != null && cursor.getCount() > 0) {
cursor.moveToFirst();
for (int i = 0; i < cursor.getCount(); i++) {
int id = cursor.getInt(cursor.getColumnIndex(ID_FIELD));
String name = cursor.getString(cursor
.getColumnIndex(NAME_FIELD));
String pasString = cursor.getString(cursor
.getColumnIndex(EMAIL_FIELD));
item item = new item(id, name, pasString);
items.add(item);
cursor.moveToNext();
}
}
cursor.close();
db.close();
return items;
}
}
Logcat error.
09-28 15:28:46.667: E/AndroidRuntime(21150): FATAL EXCEPTION: main
09-28 15:28:46.667: E/AndroidRuntime(21150): java.lang.NullPointerException
09-28 15:28:46.667: E/AndroidRuntime(21150): at com.example.text.MainActivity.save(MainActivity.java:110)
09-28 15:28:46.667: E/AndroidRuntime(21150): at com.example.text.MainActivity$1.onClick(MainActivity.java:48)
09-28 15:28:46.667: E/AndroidRuntime(21150): at android.view.View.performClick(View.java:4102)
09-28 15:28:46.667: E/AndroidRuntime(21150): at android.view.View$PerformClick.run(View.java:17085)
09-28 15:28:46.667: E/AndroidRuntime(21150): at android.os.Handler.handleCallback(Handler.java:615)
09-28 15:28:46.667: E/AndroidRuntime(21150): at android.os.Handler.dispatchMessage(Handler.java:92)
09-28 15:28:46.667: E/AndroidRuntime(21150): at android.os.Looper.loop(Looper.java:155)
09-28 15:28:46.667: E/AndroidRuntime(21150): at android.app.ActivityThread.main(ActivityThread.java:5511)
09-28 15:28:46.667: E/AndroidRuntime(21150): at java.lang.reflect.Method.invokeNative(Native Method)
09-28 15:28:46.667: E/AndroidRuntime(21150): at java.lang.reflect.Method.invoke(Method.java:511)
09-28 15:28:46.667: E/AndroidRuntime(21150): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)
09-28 15:28:46.667: E/AndroidRuntime(21150): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796)
09-28 15:28:46.667: E/AndroidRuntime(21150): at dalvik.system.NativeStart.main(Native Method)
I want to save my date in my Sqlite DataBasse and i want to show in my ListView. But when i run my apps and pressed the save button my apps turns to stop. Log cat show the error that nullpoint Exception i don't find out this. How to solve nullPointExcenrion.
