I am trying to understand whats wrong with this code. this submit button switches this activity to a QR generator which cannot have null values or else the activity crashes. This code scans the EditTexts and the RadioGroups to confirm that they are filled. The error is null values which causes the QR code not to generate which then causes the app to crash (I'm using Zxing).
Here is the error:
2020-02-08 20:50:56.692 21553-21553/com.example.scoutingapp3250 E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.scoutingapp3250, PID: 21553
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.CharSequence android.widget.RadioButton.getText()' on a null object reference
If you need the entire class let me know, its just a lot to sift through so I wanted to get the code that is relevant to the issue.
Button submit = findViewById(R.id.submit);
submit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (checkForms()) {
System.out.println("You have Missing Forms");
}
else {
openActivity2();
}
}
});
}
//this function checks the sheet for unfilled data sections
public boolean checkForms() {
boolean isEmpty = false;
scanState = ScanState.scanning;
ScrollView scrollView = findViewById(R.id.scroll);
LinearLayout linearLayout = findViewById(R.id.linearLayout);
final int childCount = linearLayout.getChildCount();
for (int i = 0; i < childCount; i++) {
View element = linearLayout.getChildAt(i);
switch (scanState) {
case scanning:
if (element instanceof EditText) {
EditText editText = (EditText) element;
if (editText.getText().toString().matches("")) {
scrollView.scrollTo(0, editText.getTop() + 10);
scanState = ScanState.empty;
isEmpty = true;
break;
}
break;
}
if (element instanceof RadioGroup) {
RadioGroup radioGroup = (RadioGroup) element;
RadioButton radioButton = findViewById(radioGroup.getCheckedRadioButtonId());
if (radioGroup.getCheckedRadioButtonId() == -1) {
scrollView.scrollTo(0, radioGroup.getTop());
scanState = ScanState.empty;
isEmpty = true;
break;
}
}
scanState = ScanState.stopped;
break;
case empty:
break;
case stopped:
break;
}
}
return isEmpty;
}
// output for the data
public void output () {
EditText scoutName = findViewById(R.id.editSN);
TextView teamNumber = findViewById(R.id.editTN);
EditText matchNumber = findViewById(R.id.editMatchNumber);
RadioGroup alliance = findViewById(R.id.alliance);
RadioButton allianceI = findViewById(alliance.getCheckedRadioButtonId());
RadioGroup driverStation = findViewById(R.id.driverStation);
RadioButton driverStationI = findViewById(driverStation.getCheckedRadioButtonId());
RadioGroup crossLine = findViewById(R.id.crossLine);
RadioButton crossLineI = findViewById(crossLine.getCheckedRadioButtonId());
TextView autoPowerPortBottom = findViewById(R.id.autoPowerPortBottomDisplay);
TextView autoPowerPortOuter = findViewById(R.id.autoPowerPortOuterDisplay);
TextView autoDroppedPowerCells = findViewById(R.id.autoDroppedPowerCellsDisplay);
RadioGroup autoConflict = findViewById(R.id.autoConflict);
RadioButton autoConflictS = findViewById(autoConflict.getCheckedRadioButtonId());
TextView powerPortBottom = findViewById(R.id.powerPortBottomDisplay);
TextView powerPortOuter = findViewById(R.id.powerPortOuterDisplay);
TextView droppedPowerCells = findViewById(R.id.droppedPowerCellsDisplay);
RadioGroup rotationControl = findViewById(R.id.rotationControlGroup);
RadioButton rotationControlI = findViewById(rotationControl.getCheckedRadioButtonId());
RadioGroup colorControl = findViewById(R.id.colorControlGroup);
RadioButton colorControlS = findViewById(colorControl.getCheckedRadioButtonId());
RadioGroup stageReached = findViewById(R.id.stageReachedGroup);
RadioButton stageReachedI = findViewById(stageReached.getCheckedRadioButtonId());
RadioGroup trench = findViewById(R.id.trenchGroup);
RadioButton trenchS = findViewById(trench.getCheckedRadioButtonId());
RadioGroup center = findViewById(R.id.centerGroup);
RadioButton centerS = findViewById(center.getCheckedRadioButtonId());
RadioGroup stayedOnTheirSide = findViewById(R.id.stayedOnTheirSideGroup);
RadioButton stayedOnTheirSideS = findViewById(stayedOnTheirSide.getCheckedRadioButtonId());
RadioGroup climb = findViewById(R.id.climb);
RadioButton climbS = findViewById(climb.getCheckedRadioButtonId());
RadioGroup multiClimb = findViewById(R.id.multiClimb);
RadioButton multiClimbS = findViewById(multiClimb.getCheckedRadioButtonId());
RadioGroup multiClimbLifted = findViewById(R.id.multiClimbLifted);
RadioButton multiClimbLiftedS = findViewById(multiClimbLifted.getCheckedRadioButtonId());
RadioGroup driverSkill = findViewById(R.id.driverSkill);
RadioButton driverSkillI = findViewById(driverSkill.getCheckedRadioButtonId());
RadioGroup focusOnDefense = findViewById(R.id.groupFocusOnDefense);
RadioButton focusOnDefenseI = findViewById(focusOnDefense.getCheckedRadioButtonId());
TextView beached = findViewById(R.id.beachedDisplay);
TextView disabled = findViewById(R.id.disabledDisplay);
TextView died = findViewById(R.id.diedDisplay);
TextView fouls = findViewById(R.id.foulDisplay);
TextView techFouls = findViewById(R.id.techFoulDisplay);
EditText notes = findViewById(R.id.editNotes);
// converts it into something somebody can read
String[] outputString = new String[]{
scoutName.getText().toString(),
teamNumber.getText().toString(),
matchNumber.getText().toString(),
allianceI.getText().toString(),
driverStationI.getText().toString(),
crossLineI.getText().toString(),
autoPowerPortBottom.getText().toString(),
autoPowerPortOuter.getText().toString(),
autoDroppedPowerCells.getText().toString(),
autoConflictS.getText().toString(),
powerPortBottom.getText().toString(),
powerPortOuter.getText().toString(),
droppedPowerCells.getText().toString(),
rotationControlI.getText().toString(),
colorControlS.getText().toString(),
stageReachedI.getText().toString(),
trenchS.getText().toString(),
centerS.getText().toString(),
stayedOnTheirSideS.getText().toString(),
climbS.getText().toString(),
multiClimbS.getText().toString(),
multiClimbLiftedS.getText().toString(),
driverSkillI.getText().toString(),
focusOnDefenseI.getText().toString(),
beached.getText().toString(),
disabled.getText().toString(),
died.getText().toString(),
fouls.getText().toString(),
techFouls.getText().toString(),
notes.getText().toString()
};
//converts it from string array to a single string for QR Code
for (int i = 0; i < outputString.length; i++) {
stringBuilder.append(outputString[i]);
stringBuilder.append(", ");
}
}
here is the class it switches to
private static final int CAMERA_PERMISSION_CODE= 101;
private static final int FILE_SHARE_PERMISSION = 102;
private TextView textView;
private ImageView barcode;
private String test;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.qr_code);
barcode=findViewById(R.id.barCode);
textView=findViewById(R.id.dataText);
Intent intent = getIntent();
String test = intent.getStringExtra("data");
String data_in_code=test;
MultiFormatWriter multiFormatWriter=new MultiFormatWriter();
try{
BitMatrix bitMatrix=multiFormatWriter.encode(data_in_code, BarcodeFormat.QR_CODE,200,200);
BarcodeEncoder barcodeEncoder=new BarcodeEncoder();
Bitmap bitmap=barcodeEncoder.createBitmap(bitMatrix);
barcode.setImageBitmap(bitmap);
}
catch (Exception e){
e.printStackTrace();
}
