问题
I'm trying to send some data from an SQLite database to a fragment via a bundle.
The debugger is showing that the cursor is returning all columns like it should, but the StringArrays are null when adding them to the bundle.
Any ideas as to why this is?
UPDATE
That seems ok, but it's throwing null pointer exception in the fragment.
Line 46 is String[] Name = args.getStringArray(names);
See LOGCAT:
12-04 13:55:41.812 5379-5379/com.example.michael.budgetapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.michael.budgetapp, PID: 5379
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String[] android.os.Bundle.getStringArray(java.lang.String)' on a null object reference
at com.example.michael.budgetapp.Tabs.Transactions.TransactionsTab.onCreateView(TransactionsTab.java:46)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1962)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1248)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1613)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:570)
at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1106)
at android.support.v4.view.ViewPager.populate(ViewPager.java:952)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1474)
at android.view.View.measure(View.java:17547)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:875)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
at android.view.View.measure(View.java:17547)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2615)
at android.view.View.measure(View.java:17547)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2015)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1173)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1379)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1061)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5885)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
at android.view.Choreographer.doCallbacks(Choreographer.java:580)
at android.view.Choreographer.doFrame(Choreographer.java:550)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Fragment Class:
public class TransactionsTab extends Fragment {
RecyclerView transactionsRecycler;
AdapterTransactions adapter;
TransactionLoad transactionLoad = null;
private Cursor data = null;
List<TransactionInfo> adapterData = new ArrayList<>();
String names, categories, currencies, prices, dates;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
transactionLoad = new TransactionLoad(getActivity());
transactionLoad.execute();
}
@Override
public View onCreateView(LayoutInflater inflater,
@Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tab_transactions, container, false);
transactionsRecycler = (RecyclerView) view.findViewById(R.id.transactionRecycler);
adapter = new AdapterTransactions(getActivity(), adapterData);
transactionsRecycler.setAdapter(adapter);
transactionsRecycler.setLayoutManager(new LinearLayoutManager(getActivity()));
transactionLoad = new TransactionLoad(getActivity());
transactionLoad.execute();
Bundle args = getArguments();
String[] Name = args.getStringArray(names);
String[] Category = args.getStringArray(categories);
String[] Currency = args.getStringArray(currencies);
String[] Price = args.getStringArray(prices);
String[] Date = args.getStringArray(dates);
for (int i = 0;
i < Name.length &&
i < Category.length &&
i < Currency.length &&
i < Price.length &&
i < Date.length;
i++) {
TransactionInfo info = new TransactionInfo();
info.itemName = Name[i];
info.itemCat = Category[i];
info.itemCurrency = Currency[i];
info.itemPrice = Price[i];
info.date = Date[i];
adapterData.add(info);
}
adapter.setData(adapterData);
adapter.notifyDataSetChanged();
adapter.transactionData.notifyAll();
return view;
}
String names, categories, currencies, prices, dates;
@Override
public void transactionLoadComplete(Cursor cursor) {
tData = cursor;
while (tData.moveToNext()) {
String[] Name = new String[]{DatabaseHelper.TRANSACTION_NAME};
String[] Category = new String[]{DatabaseHelper.TRANSACTION_CATEGORY};
String[] Currency = new String[]{DatabaseHelper.TRANSACTION_CURRENCY};
String[] Price = new String[]{DatabaseHelper.TRANSACTION_PRICE};
String[] Date = new String[]{DatabaseHelper.TRANSACTION_DATE};
String names = tData.getString(tData.getColumnIndex(DatabaseHelper.TRANSACTION_NAME));
String categories = tData.getString(tData.getColumnIndex(DatabaseHelper.TRANSACTION_CATEGORY));
String currencies = tData.getString(tData.getColumnIndex(DatabaseHelper.TRANSACTION_CURRENCY));
String prices = tData.getString(tData.getColumnIndex(DatabaseHelper.TRANSACTION_PRICE));
String dates = tData.getString(tData.getColumnIndex(DatabaseHelper.TRANSACTION_DATE));
Bundle args = new Bundle();
args.putStringArray(names, Name);
args.putStringArray(categories, Category);
args.putStringArray(currencies, Currency);
args.putStringArray(prices, Price);
args.putStringArray(dates, Date);
TransactionsTab transactionsTab = new TransactionsTab();
transactionsTab.setArguments(args);
}
}
来源：https://stackoverflow.com/questions/34095977/bundle-arguments-returning-null