androidlistviewarraylistandroid-spinner
TextWatcher incorrect selection from database
My textwatcher is gives me incorrect output in Android Studio. Can anyone suggest me the workaround to solve this issue.
Requirment. "If the course title starts with the user input in edittext then its shows in spinner(Data from database)"
Note: I am using single spinner for multiple purpose 1. Selecting spinner contects 2. showing the spinner value based on edittext user input
My codings.
package com.bar.example.myapplication;
import android.database.Cursor;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.Spinner;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class CourseSearchActivity extends AppCompatActivity {
private DBHelper db;
private List < Course > allCoursesList;
private List < Offering > allOfferingsList;
private List < Offering > filteredOfferingsList;
private EditText courseTitleEditText;
private Spinner ok;
private ListView offeringsListView;
// private selectedInstructorName selectedInstructorName;
private InstructorSpinnerAdapter instructorSpinnerAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_course_search);
deleteDatabase(DBHelper.DATABASE_NAME);
db = new DBHelper(this);
db.importCoursesFromCSV("courses.csv");
db.importOfferingsFromCSV("offerings.csv");
allOfferingsList = db.getAllOfferings();
filteredOfferingsList = new ArrayList < > (allOfferingsList);
allCoursesList = db.getAllCourses();
courseTitleEditText = (EditText) findViewById(R.id.courseTitleEditText);
courseTitleEditText.addTextChangedListener(courseTitleTextWatcher);
ok = (Spinner) findViewById(R.id.spinner1);
// offeringListAdapter = new OfferingListAdapter(this, R.layout.offering_list_item, filteredOfferingsList);
// ok.setAdapter(offeringListAdapter);
instructorSpinnerAdapter = new InstructorSpinnerAdapter(this, R.layout.offering_list_item, filteredOfferingsList);
ArrayAdapter < String > instructorSpinnerAdapter = new ArrayAdapter < String >
(this, android.R.layout.simple_spinner_item, getAllCourse());
ok.setAdapter(instructorSpinnerAdapter);
ok.setOnItemSelectedListener(instructorSpinnerListener);
}
private String[] getAllCourse() {
String[] instructorNames = new String[allCoursesList.size() + 1];
instructorNames[0] = "[Select Course]";
for (int i = 1; i < instructorNames.length; i++) {
instructorNames[i] = allCoursesList.get(i - 1).getTitle();
}
return instructorNames;
}
public TextWatcher courseTitleTextWatcher = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
String input = charSequence.toString().toLowerCase();
if (input.equals("")) {
} else {
String name = ok.getSelectedItem().toString();
//Toast.makeText(CourseSearchActivity.this, name, Toast.LENGTH_SHORT).show();
instructorSpinnerAdapter.clear();
Offering offering;
for (int j = 0; j < allOfferingsList.size(); j++) {
// If the course title starts with the user input,
// add it to the listAdapter
offering = allOfferingsList.get(j);
Course course = offering.getCourse();
if (course.getTitle().toLowerCase().contains(input)) {
instructorSpinnerAdapter.add(offering);
instructorSpinnerAdapter.notifyDataSetChanged();
ok.setSelection(instructorSpinnerAdapter.getCount() - 1);
}
}
}
}
@Override
public void afterTextChanged(Editable editable) {
}
};
public AdapterView.OnItemSelectedListener instructorSpinnerListener = new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView << ? > adapterView, View view, int i, long l) {
String selectedInstructorName = adapterView.getItemAtPosition(i).toString();
if (selectedInstructorName.equals("[Select Instructor]")) {
instructorSpinnerAdapter.clear();
for (Offering offering: allOfferingsList)
instructorSpinnerAdapter.add(offering);
} else {
instructorSpinnerAdapter.clear();
}
}
@Override
public void onNothingSelected(AdapterView << ? > adapterView) {
adapterView.setSelection(0);
// Toast.makeText(getApplicationContext(), "Why?", Toast.LENGTH_SHORT).show();
}
};
public void reset(View view) {
courseTitleEditText.setText("");
ok.setSelection(0);
}
}as per suggestion
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
String input = charSequence.toString().toLowerCase();
if (input.equals("")) {
} else {
String name = ok.getSelectedItem().toString();
//Toast.makeText(CourseSearchActivity.this, name, Toast.LENGTH_SHORT).show();
instructorSpinnerAdapter.clear();
Offering offering;
for (int j = 0; j < allOfferingsList.size(); j++) {
// If the course title starts with the user input,
// add it to the listAdapter
offering = allOfferingsList.get(j);
Course course = offering.getCourse();
if (course.getTitle().toLowerCase().contains(input)) {
if (course.getTitle().toLowerCase().startsWith(input))
instructorSpinnerAdapter.add(offering);
instructorSpinnerAdapter.notifyDataSetChanged();
ok.setSelection(instructorSpinnerAdapter.getCount() - 1);
}
}
}
}error
04-26 10:35:46.394 31756-31756/com.bar.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.bar.example.myapplication, PID: 31756
java.lang.UnsupportedOperationException
at java.util.AbstractList.remove(AbstractList.java:161)
at java.util.AbstractList$Itr.remove(AbstractList.java:374)
at java.util.AbstractList.removeRange(AbstractList.java:571)
at java.util.AbstractList.clear(AbstractList.java:234)
at android.widget.ArrayAdapter.clear(ArrayAdapter.java:285)
at com.bar.example.myapplication.CourseSearchActivity$1.onTextChanged(CourseSearchActivity.java:95)
at android.widget.TextView.sendOnTextChanged(TextView.java:8187)
at android.widget.TextView.handleTextChanged(TextView.java:8249)
at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:10371)
at android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:1208)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:578)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:509)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:508)
at android.view.inputmethod.BaseInputConnection.replaceText(BaseInputConnection.java:844)
at android.view.inputmethod.BaseInputConnection.setComposingText(BaseInputConnection.java:617)
at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:408)
at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:93)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)Current view is ..
instead of this i need to enter database x and spinner should y screen follows
my database follows.
I am trying to get single input and multiple output. screen example
revised code
public TextWatcher courseTitleTextWatcher = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
String input = charSequence.toString().toLowerCase();
ArrayAdapter adapter = (ArrayAdapter) ok.getAdapter();
ArrayAdapter adapter1 = (ArrayAdapter) ok1.getAdapter();
adapter.clear();
adapter1.clear();
if (input.equals("")) {
adapter.addAll(getAllCourse());
adapter1.addAll(getAllCourse());
} else {
Course course;
for (int j = 0; j < allCoursesList.size(); j++) {
// If the course title starts with the user input,
// add it to the listAdapter
course = allCoursesList.get(j);
if (course.getAlpha().toLowerCase().startsWith(input) || course.getNumber().toLowerCase().startsWith(input)) {
adapter.add(course.getTitle());
adapter1.add(course.getNumber());
}
}
}
adapter.notifyDataSetChanged();
if (adapter.getCount() != 0) ok.setSelection(0);
if (adapter1.getCount() != 0) ok1.setSelection(0);
}
@Override
public void afterTextChanged(Editable editable) {
}
};
public AdapterView.OnItemSelectedListener instructorSpinnerListener = new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView << ? > adapterView, View view, int i, long l) {
String selectedInstructorName = adapterView.getItemAtPosition(i).toString();
if (selectedInstructorName.equals("[Select Instructor]")) {
instructorSpinnerAdapter.clear();
for (Offering offering: allOfferingsList)
instructorSpinnerAdapter.add(offering);
} else {
instructorSpinnerAdapter.clear();
}
}
@Override
public void onNothingSelected(AdapterView << ? > adapterView) {
adapterView.setSelection(0);
// Toast.makeText(getApplicationContext(), "Why?", Toast.LENGTH_SHORT).show();
}
};@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_course_search);
deleteDatabase(DBHelper.DATABASE_NAME);
db = new DBHelper(this);
db.importCoursesFromCSV("courses.csv");
db.importOfferingsFromCSV("offerings.csv");
Button reset = (Button) findViewById(R.id.resetButton);
allOfferingsList = db.getAllOfferings();
filteredOfferingsList = new ArrayList < > (allOfferingsList);
allCoursesList = db.getAllCourses();
courseTitleEditText = (EditText) findViewById(R.id.courseTitleEditText);
courseTitleEditText.addTextChangedListener(courseTitleTextWatcher);
ok = (Spinner) findViewById(R.id.spinner1);
ok1 = (Spinner) findViewById(R.id.spinner2);
// offeringListAdapter = new OfferingListAdapter(this, R.layout.offering_list_item, filteredOfferingsList);
// ok.setAdapter(offeringListAdapter);
instructorSpinnerAdapter = new InstructorSpinnerAdapter(this, R.layout.offering_list_item, filteredOfferingsList);
ArrayAdapter < String > instructorSpinnerAdapter = new ArrayAdapter < String >
(this, android.R.layout.simple_spinner_item, getAllCourse());
ok.setAdapter(instructorSpinnerAdapter);
ok1.setAdapter(instructorSpinnerAdapter);
ok.setOnItemSelectedListener(instructorSpinnerListener);
ok1.setOnItemSelectedListener(instructorSpinnerListener);
}it works but some time not . could you check and advise...
error...attached
Another Condition:
Select spinner2 selection based on spinner screenshot attached. how to swap the same . pls advise.
Solution
Try the code below:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_course_search);
deleteDatabase(DBHelper.DATABASE_NAME);
db = new DBHelper(this);
db.importCoursesFromCSV("courses.csv");
db.importOfferingsFromCSV("offerings.csv");
Button reset = (Button) findViewById(R.id.resetButton);
allOfferingsList = db.getAllOfferings();
filteredOfferingsList = new ArrayList <> (allOfferingsList);
allCoursesList = db.getAllCourses();
courseTitleEditText = (EditText) findViewById(R.id.courseTitleEditText);
courseTitleEditText.addTextChangedListener(courseTitleTextWatcher);
ok = (Spinner) findViewById(R.id.spinner1);
ok1 = (Spinner) findViewById(R.id.spinner2);
// offeringListAdapter = new OfferingListAdapter(this, R.layout.offering_list_item, filteredOfferingsList);
// ok.setAdapter(offeringListAdapter);
instructorSpinnerAdapter = new InstructorSpinnerAdapter(this, R.layout.offering_list_item, filteredOfferingsList);
// The two spinners need to have different adapters as they will use different datasets.
ok.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, getAllCourse()));
ok1.setAdapter(new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, getAllCourseNumber()));
// The two spinner can have same listener.
ok.setOnItemSelectedListener(instructorSpinnerListener);
ok1.setOnItemSelectedListener(instructorSpinnerListener);
}
private ArrayList<String> getAllCourse() {
ArrayList<String> instructorNames = new ArrayList<>();
instructorNames.add("[Select Course]");
for (int i = 0; i < allCoursesList.size(); i++) {
instructorNames.add(allCoursesList.get(i).getTitle());
}
return instructorNames;
}
private ArrayList<String> getAllCourseNumber() {
ArrayList<String> instructorNames = new ArrayList<>();
instructorNames.add("[Select Course]");
for (int i = 0; i < allCoursesList.size(); i++) {
instructorNames.add(allCoursesList.get(i).getNumber());
}
return instructorNames;
}
public TextWatcher courseTitleTextWatcher = new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
String input = charSequence.toString().toLowerCase();
// Toast.makeText(getApplicationContext(), input, Toast.LENGTH_LONG).show();
ArrayAdapter adapter = (ArrayAdapter) ok.getAdapter();
ArrayAdapter adapter1 = (ArrayAdapter) ok1.getAdapter();
adapter.clear();
adapter1.clear();
if (input.equals("")) {
adapter.addAll(getAllCourse());
adapter1.addAll(getAllCourseNumber());
} else {
Course course;
for (int j=0; j < allCoursesList.size(); j++) {
// If the course alpha/number starts with the user input,
// add it to the listAdapter
course = allCoursesList.get(j);
if (course.getAlpha().toLowerCase().startsWith(input) || course.getNumber().toLowerCase().startsWith(input)) {
adapter.add(course.getTitle());
adapter1.add(course.getNumber());
}
}
}
adapter.notifyDataSetChanged();
adapter1.notifyDataSetChanged();
if (adapter.getCount() != 0) ok.setSelection(0);
if (adapter1.getCount() != 0) ok1.setSelection(0);
}
@Override
public void afterTextChanged(Editable editable) {}
};
public AdapterView.OnItemSelectedListener instructorSpinnerListener = new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
//String selectedInstructorName = adapterView.getItemAtPosition(i).toString();
// No matter which spinner is selected, get item from the ok [Title] spinner.
String selectedInstructorName = ok.getItemAtPosition(i).toString();
if (selectedInstructorName.equals("[Select Instructor]")) {
instructorSpinnerAdapter.clear();
for (Offering offering: allOfferingsList)
instructorSpinnerAdapter.add(offering);
} else {
instructorSpinnerAdapter.clear();
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
adapterView.setSelection(0);
// Toast.makeText(getApplicationContext(), "Why?", Toast.LENGTH_SHORT).show();
}
};
I am not sure why use getAlpha() in TextWatcher as you show that alpha is always CS. If the code does not work, then in getAllCourseNumber() change allCoursesList.get(i).getNumber() to allCoursesList.get(i).getAlpha(), so we can have a list of alpha for checking.
Hope that helps!
Updated the OnItemSelectedListener:
public AdapterView.OnItemSelectedListener instructorSpinnerListener = new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
// Sync the selection of the two spinners.
if(adapterView.getId() == R.id.spinner1){
ok1.setOnItemSelectedListener(null);
ok1.setSelection(i);
ok1.setOnItemSelectedListener(this);
}else{
ok.setOnItemSelectedListener(null);
ok.setSelection(i);
ok.setOnItemSelectedListener(this);
}
// No matter which spinner is selected, get item from the ok [Title] spinner.
String selectedInstructorName = ok.getItemAtPosition(i).toString();
if (selectedInstructorName.equals("[Select Instructor]")) {
instructorSpinnerAdapter.clear();
for (Offering offering: allOfferingsList)
instructorSpinnerAdapter.add(offering);
} else {
instructorSpinnerAdapter.clear();
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
adapterView.setSelection(0);
// Toast.makeText(getApplicationContext(), "Why?", Toast.LENGTH_SHORT).show();
}
};
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