我想帮助我开发一个带有从firebase获取的列表的数字选择器,此代码现在给我一个错误,如果我删除setMaxValue和MinValue,它只给我一个值。
如果我留下最小和最大两行错误:
E / AndroidRuntime:FATAL EXCEPTION:main进程:com.example.ibra.kl,PID:13463 java.lang.ArrayIndexOutOfBoundsException:length = 1 ;在android.widget.NumberPicker.ensureCachedSelectorValue(NumberPicker.java:1900)的android.widget.NumberPicker.initializeSelectorWheelIndices(NumberPicker.java:1715)的android.widget.NumberPicker.setMaxValue(NumberPicker.java:1471)的index = 1 com.google.firebase.database.core.ValueEventRegistration.fireEvent中的.example.ibra.kl.ProductoPostActivity $ 2.onDataChange(ProdActivity.java:143)(com.google.firebase:firebase-database @@ 16.1.0:75)在www.google.firebase.database.core.view.DataEvent.fire(com.google.firebase:firebase-database @@ 16.1.0:63)的com.google.firebase.database.core.view.EventRaiser $ 1上。在android.os.Handler.dispatchMessage(Handler.java:98)的android.os.Handler.handleCallback(Handler.java:789)上运行(com.google.firebase:firebase-database @@ 16.1.0:55)at android.os.Looper.loop(Looper.java:164)位于com.android.internal的java.lang.reflect.Method.invoke(Native Method)的android.app.ActivityThread.main(ActivityThread.java:6944)。 os.Zygote $ MethodAndArgsCaller.run(Zygote.java :327)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
我是什么尝试过:
CBSList = new ArrayList<>();解决方案
DatabaseReference reference = FirebaseDatabase.getInstance()。getReference(Posts)。child(post.getIDPost())。child(CBS);
reference.addValueEventListener(new ValueEventListener(){
@Override
public void onDataChange(DataSnapshot dataSnapshot){
CBSList.clear();
for (DataSnapshot snapshot:dataSnapshot.getChildren()){
CBSList.add(snapshot.getKey());
String array [] = new String [CBSList.size()];
for(int j = 0; j< CBSList.size(); j ++){
array [j] = CBSList.get(j);
}
numberPicker.setMaxValue(CBSList.size() - 1);
numberPicker.setMinValue(0);
numberPicker.setDisplayedValues(array);
numberPicker.setWrapSelectorWheel(true);
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError){
}
});
I wanted to help me develop a numberpicker with a list that I get from firebase, this code now gives me an error and if I delete "setMaxValue and MinValue" it only brings me a single value.
error if I leave the two lines of min and max:
E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.ibra.kl, PID: 13463 java.lang.ArrayIndexOutOfBoundsException: length=1; index=1 at android.widget.NumberPicker.ensureCachedScrollSelectorValue(NumberPicker.java:1900) at android.widget.NumberPicker.initializeSelectorWheelIndices(NumberPicker.java:1715) at android.widget.NumberPicker.setMaxValue(NumberPicker.java:1471) at com.example.ibra.kl.ProductoPostActivity$2.onDataChange(ProdActivity.java:143) at com.google.firebase.database.core.ValueEventRegistration.fireEvent(com.google.firebase:firebase-database@@16.1.0:75) at com.google.firebase.database.core.view.DataEvent.fire(com.google.firebase:firebase-database@@16.1.0:63) at com.google.firebase.database.core.view.EventRaiser$1.run(com.google.firebase:firebase-database@@16.1.0:55) at android.os.Handler.handleCallback(Handler.java:789) at android.os.Handler.dispatchMessage(Handler.java:98) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6944) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
What I have tried:
CBSList = new ArrayList<>(); DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Posts").child(post.getIDPost()).child("CBS"); reference.addValueEventListener( new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { CBSList.clear(); for (DataSnapshot snapshot : dataSnapshot.getChildren()) { CBSList.add(snapshot.getKey()); String array[] = new String[CBSList.size()]; for(int j =0;j<CBSList.size();j++){ array[j] = CBSList.get(j); } numberPicker.setMaxValue(CBSList.size() - 1); numberPicker.setMinValue(0); numberPicker.setDisplayedValues(array); numberPicker.setWrapSelectorWheel(true); } } @Override public void onCancelled(@NonNull DatabaseError databaseError) { } } );解决方案
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