I have some problem with my code, when I need to transfer some data from one Activity to another one. First Activity (ViewCashflow) and I want transfer some data from ViewCashflow to second Activity (NewTransaction). Here its working well with no error, the data transferred successfully. But, I don't know what's going on when I run the second Activity directly (not from first Activity like before when I transfer the data) I got null pointer exception on the method that I use to receive the data from first Activity.
I have tried to figure all things there, but still unsolved. In other Activity (ViewCategory and AddCategory) I'm doing the same things (transfer data from ViewCategory to AddCategory) its working well and there's no error when I run AddCategory directly but the code is exactly have same pattern with the two Activity which I got the error.
Please master help me. Thanks before.
The error report gimme this one:
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.os.Bundle.getBoolean(java.lang.String)' on a null object reference at com.example.ever_ncn.cashflow.NewTransaction.onCreate(NewTransaction.java:68)
NB. This my code for first Activity (ViewCashflow)
public class ViewCashflow extends ActionBarActivity { private SQLiteDatabase db; private static Button BtnIAddCateg; private static Button BtnICancelCateg; private static final String TAG = CategorySetting.class.getSimpleName(); DatabaseHelper dBHelper = new DatabaseHelper (this); private ListView list; private ArrayList arrTransId = new ArrayList(); private ArrayList arrTransName = new ArrayList(); private ArrayList arrTransAmount = new ArrayList(); private ArrayList arrTransType= new ArrayList(); private ArrayList arrTransDate= new ArrayList(); private ArrayList arrCategId= new ArrayList(); private AlertDialog.Builder build; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_view_cashflow); displayData(); } //udah beres udah bisa show, tinggal action click udh bisa tp value blm pindah,, //penggunaan Radio Button belum nanti di NewTrans private void displayData() { db = dBHelper.getReadableDatabase(); Cursor mCursor = db.rawQuery("SELECT * FROM " + dBHelper.TABLE_Trans_NAME, null); list = (ListView)findViewById(android.R.id.list); arrTransId.clear(); arrTransName.clear(); arrTransAmount.clear(); arrTransType.clear(); arrTransDate.clear(); arrCategId.clear(); if (mCursor.moveToFirst()) { do { arrTransId.add(mCursor.getString(mCursor.getColumnIndex(dBHelper.TOL1))); arrTransName.add(mCursor.getString(mCursor.getColumnIndex(dBHelper.TOL2))); arrTransAmount.add(mCursor.getString(mCursor.getColumnIndex(dBHelper.TOL3))); arrTransType.add(mCursor.getString(mCursor.getColumnIndex(dBHelper.TOL4))); arrTransDate.add(mCursor.getString(mCursor.getColumnIndex(dBHelper.TOL5))); arrCategId.add(mCursor.getString(mCursor.getColumnIndex(dBHelper.TOL6))); } while (mCursor.moveToNext()); } DisplayAdapterTrans disadptr = new DisplayAdapterTrans(ViewCashflow.this, arrTransId, arrTransName, arrTransAmount, arrTransType, arrTransDate, arrCategId); list.setAdapter(disadptr); mCursor.close(); list.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView> arg0, View arg1, int arg2, long arg3) { //click to update data // namanya blom diubah coeg Intent i = new Intent(getApplicationContext(), NewTransaction.class); i.putExtra("TransId", arrTransId.get(arg2)); i.putExtra("TransName", arrTransName.get(arg2)); i.putExtra("TransAmount", arrTransAmount.get(arg2)); i.putExtra("TransType", arrTransType.get(arg2)); i.putExtra("TransDate", arrTransDate.get(arg2)); i.putExtra("TransCategId", arrCategId.get(arg2)); i.putExtra("update", true); startActivity(i); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_view_cashflow, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } } And this one for second Activity (NewTransaction)
public class NewTransaction extends ActionBarActivity { Button btnIDate; Button btnIAdd; Button btnICancel; RadioButton RdIncome; RadioButton RdOutcome; EditText txtAmount, txtCashflow, txtType; DatabaseHelper dbHelper = new DatabaseHelper(this); SQLiteDatabase db; MainActivity mainAct = new MainActivity(); int year_x, month_x, day_x; static final int DIALOG_ID=0; public static long dateSelected; public static Integer intAmount = null; private boolean isUpdate; private String id, transname, transamount, transtype, transdate, transcategid; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_new_transaction); txtAmount = (EditText)findViewById(R.id.txtAmount); txtCashflow = (EditText)findViewById(R.id.txtCashflow); txtType = (EditText)findViewById(R.id.txtType); RdIncome = (RadioButton)findViewById(R.id.RdBtnIncome); RdOutcome = (RadioButton)findViewById(R.id.RdBtnOutcome); final Calendar cal = Calendar.getInstance(); year_x = cal.get(Calendar.YEAR); month_x = cal.get(Calendar.MONTH); day_x = cal.get(Calendar.DAY_OF_MONTH); TextView lblIDate = (TextView)findViewById(R.id.lblDate); lblIDate.setText("Date selected : " + year_x + "-" + month_x + "-" + day_x); //EditText lbltxt = (EditText)findViewById(R.id.txtType); dateSelected = (year_x+month_x+day_x); String catSelected = mainAct.getCatSelected(); //kena null object dsni entah knapa showDialogOnClick(); isUpdate=getIntent().getExtras().getBoolean("update"); if(isUpdate) { id=getIntent().getExtras().getString("TransId"); transname=getIntent().getExtras().getString("TransName"); transamount=getIntent().getExtras().getString("TransAmount"); transtype=getIntent().getExtras().getString("TransType"); transdate=getIntent().getExtras().getString("CategDate"); transcategid=getIntent().getExtras().getString("CategCategId"); txtCashflow.setText(transname); txtType.setText(transtype); txtAmount.setText(transamount); } if(RdIncome.isChecked()){ txtType.setText("Income"); }else{ txtType.setText("Outcome"); } onButtonClickButtonListener(dateSelected, catSelected); } public void showDialogOnClick(){ //TextView lblIDate = (TextView)findViewById(R.id.lblDate); btnIDate = (Button)findViewById(R.id.btnDate); btnIDate.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { showDialog(DIALOG_ID); } } ); } @Override protected Dialog onCreateDialog(int id){ if (id == DIALOG_ID) return new DatePickerDialog(this, dpickerListener , year_x, month_x, day_x); return null; } public DatePickerDialog.OnDateSetListener dpickerListener = new DatePickerDialog.OnDateSetListener() { @Override public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) { TextView lblIDate = (TextView)findViewById(R.id.lblDate); year_x= year; month_x = monthOfYear + 1; day_x = dayOfMonth; lblIDate.setText("Date selected : " + year_x + "-" + month_x + "-" + day_x); Toast.makeText(NewTransaction.this, year_x + "/" + month_x + "/" + day_x, Toast.LENGTH_LONG).show(); //DateFormat.getDateInstance().format(myDatePicker.getCalendarView().getDate()); } }; private void clearText(){ txtCashflow.clearComposingText(); txtAmount.clearComposingText(); txtType.clearComposingText(); } public void onButtonClickButtonListener(final long dateSelected, final String catSelected){ btnIAdd = (Button)findViewById(R.id.btnAddTrans); btnIAdd.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { /*if(RdIncome.isChecked()){ txtType.setText("Income"); }else{ txtType.setText("Outcome"); }*/ if (isUpdate) { //update Toast.makeText(NewTransaction.this, "Clicked", Toast.LENGTH_LONG).show(); intAmount = Integer.parseInt(txtAmount.getText().toString()); boolean isInserted = dbHelper.updateTransData(id, txtCashflow.getText().toString(), intAmount, txtType.getText().toString(), dateSelected, catSelected, null); if (isInserted == true) { Toast.makeText(NewTransaction.this, "Inserted", Toast.LENGTH_LONG).show(); clearText(); Intent intent = new Intent( NewTransaction.this, ViewCashflow.class ); startActivity(intent); } else Toast.makeText(NewTransaction.this, "Not Inserted", Toast.LENGTH_LONG).show(); } else { //insert Toast.makeText(NewTransaction.this, "Clicked", Toast.LENGTH_LONG).show(); intAmount = Integer.parseInt(txtAmount.getText().toString()); boolean isInserted = dbHelper.insertTransData(txtCashflow.getText().toString(), intAmount, txtType.getText().toString(), dateSelected, catSelected, null); if (isInserted == true) { Toast.makeText(NewTransaction.this, "Inserted", Toast.LENGTH_LONG).show(); clearText(); Intent intent = new Intent( NewTransaction.this, ViewCashflow.class ); startActivity(intent); } else Toast.makeText(NewTransaction.this, "Not Inserted", Toast.LENGTH_LONG).show(); } } }); btnICancel = (Button)findViewById(R.id.btnCancelTrans); btnICancel.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent( NewTransaction.this, MainActivity.class ); startActivity(intent); } } ); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_new_transaction_, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } } here is my code for CategorySetting/ViewCategory (another Activity that work with this pattern of code) :
public class CategorySetting extends Activity { private SQLiteDatabase db; private static Button BtnIAddCateg; private static Button BtnICancelCateg; private static final String TAG = CategorySetting.class.getSimpleName(); DatabaseHelper dBHelper = new DatabaseHelper (this); private ListView list; private ArrayList arrCategId = new ArrayList(); private ArrayList arrCategName = new ArrayList(); private ArrayList arrCategNote = new ArrayList(); private ArrayList arrCategCurr = new ArrayList(); private AlertDialog.Builder build; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_category_setting); onButtonClickButtonListener(); //ListView list = getListView(); //showListView(); displayData(); onLongClickListener(); } private void displayData() { db = dBHelper.getReadableDatabase(); Cursor mCursor = db.rawQuery("SELECT * FROM " + dBHelper.TABLE_Categ_NAME, null); list = (ListView)findViewById(android.R.id.list); arrCategId.clear(); arrCategName.clear(); arrCategNote.clear(); arrCategCurr.clear(); if (mCursor.moveToFirst()) { do { arrCategId.add(mCursor.getString(mCursor.getColumnIndex(dBHelper.COL1))); arrCategName.add(mCursor.getString(mCursor.getColumnIndex(dBHelper.COL2))); arrCategNote.add(mCursor.getString(mCursor.getColumnIndex(dBHelper.COL3))); arrCategCurr.add(mCursor.getString(mCursor.getColumnIndex(dBHelper.COL4))); } while (mCursor.moveToNext()); } DisplayAdapter disadpt = new DisplayAdapter(CategorySetting.this, arrCategId, arrCategName, arrCategId, arrCategCurr); list.setAdapter(disadpt); mCursor.close(); list.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView> arg0, View arg1, int arg2, long arg3) { //click to update data Intent i = new Intent(getApplicationContext(), AddCategory.class); i.putExtra("CategId", arrCategId.get(arg2)); i.putExtra("CategName", arrCategName.get(arg2)); i.putExtra("CategNote", arrCategNote.get(arg2)); i.putExtra("CategCurr", arrCategCurr.get(arg2)); i.putExtra("update", true); startActivity(i); } }); } private void onLongClickListener(){ ListView list = (ListView)findViewById(android.R.id.list); list.setOnItemLongClickListener(new OnItemLongClickListener() { public boolean onItemLongClick(AdapterView> arg0, View arg1, final int arg2, long arg3) { build = new AlertDialog.Builder(CategorySetting.this); build.setTitle("Delete " + arrCategName.get(arg2)); build.setMessage("Do you want to delete ?"); build.setPositiveButton("Yes",new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { Toast.makeText( getApplicationContext(), arrCategName.get(arg2) + " is deleted.", Toast.LENGTH_LONG).show(); db.delete( dBHelper.TABLE_Categ_NAME, dBHelper.COL1 + "=" + arrCategId.get(arg2), null); displayData(); dialog.cancel(); } }); build.setNegativeButton("No", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); AlertDialog alert = build.create(); alert.show(); return true; } }); } //ListView view = getListView(); //iew.addHeaderView(getLayoutInflater().inflate(R.layout.trans, null)); //db = dBHelper.getWritableDatabase(); //this.muat_ulang(); /*public void reload(){ try { DatabaseHelper dbHelper = new DatabaseHelper(this.getApplicationContext()); db = dbHelper.getWritableDatabase(); Cursor c = db.rawQuery("SELECT CategName FROM " + tableName, null); if (c != null ) { if (c.moveToFirst()) { do { String categName = c.getString(c.getColumnIndex("CategName")); }while (c.moveToNext()); } } } catch (SQLiteException se ) { Log.e(getClass().getSimpleName(), "Could not create or Open the database"); } finally { if (db != null) db.execSQL("DELETE FROM " + tableName); db.close(); } }*/ @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_category_setting, menu); return true; } public void onButtonClickButtonListener(){ BtnIAddCateg = (Button)findViewById(R.id.btnAddNewCateg); BtnIAddCateg.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { Intent intentAddCateg = new Intent ("com.example.ever_ncn.cashflow.AddCategory"); intentAddCateg.putExtra("update", false); startActivity(intentAddCateg); startActivity(intentAddCateg); } } ); BtnICancelCateg = (Button)findViewById(R.id.btnCancelCateg); BtnICancelCateg.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent( CategorySetting.this, MainActivity.class ); startActivity(intent); } } ); } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } } and this one for AddCategory:
public class AddCategory extends ActionBarActivity { private static Button BtnIAdd; private static Button BtnICancel; EditText txtcategname, txtType; Spinner selectCurrency; ArrayAdapter adapterCurrency; DatabaseHelper DbHelper = new DatabaseHelper(this); SQLiteDatabase db; private boolean isUpdate; private String id, categname, categnote, categcurr; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_add_category); txtcategname = (EditText)findViewById(R.id.editText); txtType = (EditText)findViewById(R.id.editText2); BtnICancel = (Button)findViewById(R.id.btnCancel); BtnIAdd = (Button)findViewById(R.id.btnAdd); //spinner selectCurrency = (Spinner) findViewById(R.id.spin_selectCurrency); adapterCurrency = ArrayAdapter.createFromResource(this, R.array.CurrencyName,android.R.layout.simple_spinner_item ); adapterCurrency.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); selectCurrency.setAdapter(adapterCurrency); selectCurrency.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView> parent, View view, int position, long id) { Toast.makeText(getBaseContext(), parent.getItemAtPosition(position) + " selected", Toast.LENGTH_LONG).show(); String currencyValue = String.valueOf(parent.getSelectedItem()); } @Override public void onNothingSelected(AdapterView> parent) { } }); isUpdate=getIntent().getExtras().getBoolean("update"); if(isUpdate) { id=getIntent().getExtras().getString("CategId"); categname=getIntent().getExtras().getString("CategName"); categnote=getIntent().getExtras().getString("CategNote"); categcurr=getIntent().getExtras().getString("CategCurr"); txtcategname.setText(categname); txtType.setText(categnote); } addCategData(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_add_category, menu); return true; } public void addCategData(){ BtnIAdd.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(AddCategory.this, "Clicked", Toast.LENGTH_LONG).show(); db=DbHelper.getWritableDatabase(); ContentValues values=new ContentValues(); values.put(DbHelper.COL2,categname ); values.put(DbHelper.COL3,categnote ); values.put(DbHelper.COL4,categcurr ); System.out.println(""); if(isUpdate) { //update database with new data boolean isInserted = DbHelper.updateCategData(Integer.parseInt(id), txtcategname.getText().toString(), txtType.getText().toString(), selectCurrency.getSelectedItem().toString(), null); if (isInserted == true) { Toast.makeText(AddCategory.this, "Updated", Toast.LENGTH_LONG).show(); //baru sampe dsni Intent intent = new Intent( AddCategory.this, CategorySetting.class ); startActivity(intent); } else Toast.makeText(AddCategory.this, "Not Inserted", Toast.LENGTH_LONG).show(); } else { //insert data into database boolean isInserted = DbHelper.insertCategData(txtcategname.getText().toString(), txtType.getText().toString(), selectCurrency.getSelectedItem().toString(), null); if (isInserted == true) { Toast.makeText(AddCategory.this, "Inserted", Toast.LENGTH_LONG).show(); //baru sampe dsni Intent intent = new Intent( AddCategory.this, CategorySetting.class ); startActivity(intent); } else Toast.makeText(AddCategory.this, "Not Inserted", Toast.LENGTH_LONG).show(); } //close database db.close(); finish(); } } ); BtnICancel.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { finish(); } } ); } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } }