-2
我正在使用android中的窗体，通过选择放置在当前下拉菜单上的另一个下拉菜单的值来呈现一个下拉菜单的值。 因此，我在这里从大学下拉列表中选择一所大学，并选择我提供Institutions的值并将其添加到院校下拉列表中，然后从Institution下拉列表中选择一个Institution。 直到这里一切都很好，但之后，如果我再次改变大学，那么应用程序崩溃。 问题是，在logcat中它显示NullPointerException，但它没有显示崩溃或崩溃原因的行号。Android：无法找到NullPointerException的原因
的logcat：
FATAL EXCEPTION: main
java.lang.NullPointerException
at android.widget.Spinner.makeAndAddView(Spinner.java:548)
at android.widget.Spinner.layout(Spinner.java:496)
at android.widget.Spinner.onLayout(Spinner.java:460)
at android.view.View.layout(View.java:14243)
at android.view.ViewGroup.layout(ViewGroup.java:4490)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1670)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1528)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1441)
at android.view.View.layout(View.java:14243)
at android.view.ViewGroup.layout(ViewGroup.java:4490)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.widget.ScrollView.onLayout(ScrollView.java:1470)
at android.view.View.layout(View.java:14243)
at android.view.ViewGroup.layout(ViewGroup.java:4490)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.view.View.layout(View.java:14243)
at android.view.ViewGroup.layout(ViewGroup.java:4490)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1670)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1528)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1441)
at android.view.View.layout(View.java:14243)
at android.view.ViewGroup.layout(ViewGroup.java:4490)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.view.View.layout(View.java:14243)
at android.view.ViewGroup.layout(ViewGroup.java:4490)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1670)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1528)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1441)
at android.view.View.layout(View.java:14243)
at android.view.ViewGroup.layout(ViewGroup.java:4490)
at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
at android.view.View.layout(View.java:14243)
at android.view.ViewGroup.layout(ViewGroup.java:4490)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2230)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1994)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1181)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4942)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:776)
at android.view.Choreographer.doCallbacks(Choreographer.java:579)
at android.view.Choreographer.doFrame(Choreographer.java:548)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:762)
at android.os.Handler.handleCallback(Handler.java:800)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5370)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)
EducationalSchoolCollege.java发生
public class EducationalSchoolCollege extends AppCompatActivity {
private RadioGroup rg__educational_type;
private RadioButton radioeduButton;
Spinner university,instituition,degree,stream,tenureType,tenureLevel,cycleSpinner;
String student_uuid,student_name,email_id,selectedTypeIs="";
Map<String,String> educationSubmitMapData = new HashMap<>();
Map<String,String> universityListMap = new HashMap<>();
Map<String,String> instituteListMap = new HashMap<>();
List<String> universityList = new ArrayList<>();
List<String> instituteList = new ArrayList<>();
List<String> degreeList = new ArrayList<>();
List<String> streamList = new ArrayList<>();
List<String> tenureTypeList = new ArrayList<>();
List<String> tenureLevelList = new ArrayList<>();
List<String> cycleList = new ArrayList<>();
List<String> universityNameList = new ArrayList<>();
List<String> instituteNameList = new ArrayList<>();
List<String> degreeNameList = new ArrayList<>();
List<String> streamNameList = new ArrayList<>();
List<String> tenureNameList = new ArrayList<>();
List<String> tenureLevelNameList = new ArrayList<>();
List<String> cycleNameList = new ArrayList<>();
String university_uuid,institute_uuid,degree_uuid,stream_uuid,tenure_uuid,tenure_level_uuid,cycle_uuid,degree_name;
Button submitEducationalBtn;
SharedPreferences afterClassPref;
AfterClassApp controller;
public ProgressDialog progdialog;
TextView clickHereId;
String fromProfile = "",genreic_user="";
//avinash
// TextView textView4;
TextView degreeText,streamText,tenureText,cycleText;
EditText edt_instituition_other;
boolean selectedIsOther=false;
boolean isCheckedRadio = false;
//avinash
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.educational_school_college);
controller = (AfterClassApp) getApplicationContext();
afterClassPref = getApplicationContext().getSharedPreferences(Constants.SHARED_PREF_NAME, Context.MODE_PRIVATE);
student_uuid = afterClassPref.getString("studentUUID", null);
student_name = afterClassPref.getString("studentName", null);
email_id = afterClassPref.getString("studentEmail", null);
university = (Spinner) findViewById(R.id.university);
instituition = (Spinner) findViewById(R.id.instituition);
degree = (Spinner) findViewById(R.id.degree);
stream = (Spinner) findViewById(R.id.stream);
tenureType = (Spinner) findViewById(R.id.tenure);
tenureLevel = (Spinner) findViewById(R.id.tenureLevel);
cycleSpinner = (Spinner) findViewById(R.id.cycle);
submitEducationalBtn = (Button) findViewById(R.id.submitEducationalBtn);
clickHereId = (TextView) findViewById(R.id.clickHereId);
//avinash
edt_instituition_other = (EditText)findViewById(R.id.edt_instituition_other);
degreeText=(TextView)findViewById(R.id.degreeText);
streamText=(TextView)findViewById(R.id.streamText);
tenureText=(TextView)findViewById(R.id.tenureText);
cycleText=(TextView)findViewById(R.id.cycleText);
// textView4 = (TextView)findViewById(R.id.textView4);
rg__educational_type = (RadioGroup) findViewById(R.id.rg__educational_type);
clickHereId.setVisibility(View.GONE);
if (Build.VERSION.SDK_INT < 21) {
rg__educational_type.setPadding(3,3,3,3);
}
Bundle extras = getIntent().getExtras();
if (extras != null) {
if (extras.containsKey("from_profile")){
fromProfile = extras.getString("from_profile");
}
if (extras.containsKey("genreic_user")){
genreic_user = extras.getString("genreic_user");
}
}
//G Analytics
if (!Constants.IS_EMAIL_EXIT) {
Tracker tracker = ((AfterClassApp) getApplication()).getTracker(AfterClassApp.TrackerName.APP_TRACKER);
tracker.setScreenName("MyAfterClass EducationalSchoolCollege");
tracker.send(new HitBuilders.AppViewBuilder().build());
}
rg__educational_type.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener()
{
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
int selectedId = rg__educational_type.getCheckedRadioButtonId();
radioeduButton = (RadioButton) findViewById(selectedId);
instituition.setAdapter(null);
degree.setAdapter(null);
stream.setAdapter(null);
tenureType.setAdapter(null);
tenureLevel.setAdapter(null);
cycleSpinner.setAdapter(null);
if(radioeduButton.getText().toString().equals("School")){
edt_instituition_other.setVisibility(View.GONE);
isCheckedRadio = true;
clickHereId.setVisibility(View.GONE);
setAdapter(university,universityNameList);
universityList.clear();
instituteList.clear();
degreeList.clear();
streamList.clear();
tenureTypeList.clear();
tenureLevelList.clear();
cycleList.clear();
universityNameList.clear();
instituteNameList.clear();
degreeNameList.clear();
streamNameList.clear();
tenureNameList.clear();
tenureLevelNameList.clear();
cycleNameList.clear();
firstTimeSchoolUserData("university",null,null,null,null);
selectedTypeIs = "board";
degreeText.setVisibility(View.GONE);
degree.setVisibility(View.GONE);
stream.setVisibility(View.GONE);
tenureType.setVisibility(View.GONE);
cycleSpinner.setVisibility(View.GONE);
streamText.setVisibility(View.GONE);
tenureText.setVisibility(View.GONE);
cycleText.setVisibility(View.GONE);
}
if(radioeduButton.getText().toString().equals("College")){
edt_instituition_other.setVisibility(View.GONE);
isCheckedRadio = true;
if ("yes".equalsIgnoreCase(genreic_user)){
clickHereId.setVisibility(View.GONE);
}else{
clickHereId.setVisibility(View.VISIBLE);
}
setAdapter(university,universityNameList);
universityList.clear();
instituteList.clear();
degreeList.clear();
streamList.clear();
tenureTypeList.clear();
tenureLevelList.clear();
cycleList.clear();
universityNameList.clear();
instituteNameList.clear();
degreeNameList.clear();
streamNameList.clear();
tenureNameList.clear();
tenureLevelNameList.clear();
cycleNameList.clear();
firstTimeUserData("university", null, null,null,null,null,null,null);
selectedTypeIs = "college";
degreeText.setVisibility(View.VISIBLE);
degree.setVisibility(View.VISIBLE);
stream.setVisibility(View.VISIBLE);
tenureType.setVisibility(View.VISIBLE);
cycleSpinner.setVisibility(View.VISIBLE);
streamText.setVisibility(View.VISIBLE);
tenureText.setVisibility(View.VISIBLE);
cycleText.setVisibility(View.VISIBLE);
}
}
});
// avinash
clickHereId.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(EducationalSchoolCollege.this, OtherFirstTimeEducational.class);
startActivity(intent);
}
});
// setAdapter(university,universityList);
// firstTimeUserData("university",null,null,null,null,null,null,null);
university.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long arg3) {
String seluniversity = (String) university.getSelectedItem();
instituteList.clear();;
degreeList.clear();
streamList.clear();
tenureTypeList.clear();
tenureLevelList.clear();
cycleList.clear();
instituteNameList.clear();;
degreeNameList.clear();
streamNameList.clear();
tenureNameList.clear();
tenureLevelNameList.clear();
cycleNameList.clear();
Log.d("UNI ","seluniversity "+ seluniversity+ " pos:: "+position);
// clear on proper selecting
// clear on proper selecting
if ("board".equalsIgnoreCase(selectedTypeIs)){
//Todo
university_uuid = universityListMap.get(seluniversity);
firstTimeSchoolUserData("institute",university_uuid,null,null,null);
}else{
if (!"Select".equalsIgnoreCase(seluniversity)){
university_uuid = universityList.get(position-1);
educationSubmitMapData.put("university_uuid",university_uuid);
Log.d("UNI ", "university_uuid "+university_uuid);
// firstTimeUserInstitutionData("institute",university_uuid);
firstTimeUserData("institute",university_uuid,null,null,null,null,null,null);
}else{
university_uuid = null;
}
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
instituition.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long arg3) {
String selInstitute = (String) instituition.getSelectedItem();
degreeList.clear();
streamList.clear();
tenureTypeList.clear();
tenureLevelList.clear();
cycleList.clear();
degreeNameList.clear();
streamNameList.clear();
tenureNameList.clear();
tenureLevelNameList.clear();
cycleNameList.clear();
if ("board".equalsIgnoreCase(selectedTypeIs)) {
//Todo
institute_uuid = instituteListMap.get(selInstitute);
if ("other".equalsIgnoreCase(selInstitute)){
// TODO: Hide edittext box and show here
edt_instituition_other.setVisibility(View.VISIBLE);
selectedIsOther=true;
}else{
selectedIsOther=false;
edt_instituition_other.setVisibility(View.GONE);
}
tenureLevelList.clear();
firstTimeSchoolUserData("tenure_level", university_uuid, institute_uuid, null, null);
} else {
if (!"Select".equalsIgnoreCase(selInstitute)) {
// int position = university.getSelectedItemPosition();
if(instituteList.size()==0){
return;
}
edt_instituition_other.setVisibility(View.GONE);
institute_uuid = instituteList.get(position - 1);
educationSubmitMapData.put("institute_uuid", institute_uuid);
// firstTimeUserDegreeData("degree", university_uuid, institute_uuid);
firstTimeUserData("degree", university_uuid, institute_uuid, null, null, null, null, null);
} else {
institute_uuid = null;
}
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
degree.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long arg3) {
String selInstitute = (String) degree.getSelectedItem();
streamList.clear();
tenureTypeList.clear();
tenureLevelList.clear();
cycleList.clear();
streamNameList.clear();
tenureNameList.clear();
tenureLevelNameList.clear();
cycleNameList.clear();
if (!"Select".equalsIgnoreCase(selInstitute)){
// int position = university.getSelectedItemPosition();
if(degreeList.size()==0){
return;
}
degree_uuid = degreeList.get(position-1);
degree_name = degreeNameList.get(position-1);
// Log.d("degree_name",""+degree_name);
educationSubmitMapData.put("degree_uuid",degree_uuid);
// firstTimeUserDegreeData("degree", university_uuid, institute_uuid);
firstTimeUserData("stream",university_uuid,institute_uuid,degree_uuid,null,null,null,null);
}else{
degree_uuid = null;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
stream.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long arg3) {
String selInstitute = (String) stream.getSelectedItem();
tenureTypeList.clear();
tenureLevelList.clear();
cycleList.clear();
tenureNameList.clear();
tenureLevelNameList.clear();
cycleNameList.clear();
if (!"Select".equalsIgnoreCase(selInstitute)){
// int position = university.getSelectedItemPosition();
if(streamList.size()==0){
return;
}
stream_uuid = streamList.get(position-1);
educationSubmitMapData.put("stream_uuid",stream_uuid);
// firstTimeUserDegreeData("degree", university_uuid, institute_uuid);
firstTimeUserData("tenure_type",university_uuid,institute_uuid,degree_uuid,stream_uuid,null,null,null);
}else{
stream_uuid = null;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
tenureType.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long arg3) {
String selInstitute = (String) tenureType.getSelectedItem();
tenureLevelList.clear();
cycleList.clear();
tenureLevelNameList.clear();
cycleNameList.clear();
if (!"Select".equalsIgnoreCase(selInstitute)){
// int position = university.getSelectedItemPosition();
if(tenureTypeList.size()==0){
return;
}
tenure_uuid = tenureTypeList.get(position-1);
educationSubmitMapData.put("tenure_type",tenure_uuid);
// firstTimeUserDegreeData("degree", university_uuid, institute_uuid);
firstTimeUserData("tenure_level",university_uuid,institute_uuid,degree_uuid,stream_uuid,tenure_uuid,null,null);
}else{
tenure_uuid = null;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
tenureLevel.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long arg3) {
String selInstitute = (String) tenureLevel.getSelectedItem();
cycleList.clear();
cycleNameList.clear();
if (!"Select".equalsIgnoreCase(selInstitute)){
// int position = university.getSelectedItemPosition();
if(tenureLevelList.size()==0){
return;
}
tenure_level_uuid = tenureLevelList.get(position-1);
educationSubmitMapData.put("tenure_level",tenure_level_uuid);
// firstTimeUserDegreeData("degree", university_uuid, institute_uuid);
firstTimeUserData("cycle",university_uuid,institute_uuid,degree_uuid,stream_uuid,tenure_uuid,tenure_level_uuid,null);
}else{
tenure_level_uuid = null;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
cycleSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long arg3) {
String selInstitute = (String) cycleSpinner.getSelectedItem();
if (!"Select".equalsIgnoreCase(selInstitute)){
// int position = university.getSelectedItemPosition();
if(cycleList.size()==0){
return;
}
cycle_uuid = cycleList.get(position-1);
educationSubmitMapData.put("cycle",cycle_uuid);
// firstTimeUserDegreeData("degree", university_uuid, institute_uuid);
// firstTimeUserData("cycle",university_uuid,institute_uuid,degree_uuid,stream_uuid,tenure_uuid,cycle_uuid,null);
}else{
cycle_uuid = null;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
}
让我检查它是否工作。 – Shivam
你能告诉我，我可以把这些线代替吗？ – Shivam
使用spinner.setEnabled（false）而不是spinner.setAdapter（null），这将不允许从微调框中选择任何东西。 –