使用Sqlite将Edittext输入中的数据填充到Spinner Display

Question

Expert Please advise with following my query. I am trying to run the query in Android studio .

As is : Spinner shows the X value as per edittext X value input using Textwatcher.

To be : Spinner should show the Y value as per X value input in Edit text.

Example: If i enter value "6" in edittext then my spinner should show the vaue "Data Structures"

My Database follows.

Database follows

 package com.bar.example.myapplication; import android.content.ContentValues; import android.content.Context; import android.content.res.AssetManager; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.util.Log; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.Arrays; class DBHelper extends SQLiteOpenHelper { private Context mContext; //TASK: DEFINE THE DATABASE VERSION AND NAME (DATABASE CONTAINS MULTIPLE TABLES) static final String DATABASE_NAME = "OCC"; private static final int DATABASE_VERSION = 1; //TASK: DEFINE THE FIELDS (COLUMN NAMES) FOR THE COURSES TABLE public static final String COURSES_TABLE = "Courses"; public static final String COURSES_KEY_FIELD_ID = "_id"; public static final String FIELD_ALPHA = "alpha"; public static final String FIELD_NUMBER = "number"; public static final String FIELD_TITLE = "title"; //TASK: DEFINE THE FIELDS (COLUMN NAMES) FOR THE INSTRUCTORS TABLE //TASK: DEFINE THE FIELDS (COLUMN NAMES) FOR THE OFFERINGS TABLE private static final String OFFERINGS_TABLE = "Offerings"; private static final String OFFERINGS_KEY_FIELD_ID = "crn"; private static final String FIELD_SEMESTER_CODE = "semester_code"; public static final String FIELD_COURSE_ID = "course_id"; public DBHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); mContext = context; } @Override public void onCreate(SQLiteDatabase database) { String createQuery = "CREATE TABLE " + COURSES_TABLE + "(" + COURSES_KEY_FIELD_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + FIELD_ALPHA + " TEXT, " + FIELD_NUMBER + " TEXT, " + FIELD_TITLE + " TEXT" + ")"; database.execSQL(createQuery); createQuery = "CREATE TABLE " + OFFERINGS_TABLE + "(" + OFFERINGS_KEY_FIELD_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + FIELD_SEMESTER_CODE + " INTEGER, " + FIELD_COURSE_ID + " INTEGER, " + "FOREIGN KEY(" + FIELD_COURSE_ID + ") REFERENCES " + COURSES_TABLE + "(" + COURSES_KEY_FIELD_ID + ")" + ")"; database.execSQL(createQuery); } @Override public void onUpgrade(SQLiteDatabase database, int oldVersion, int newVersion) { database.execSQL("DROP TABLE IF EXISTS " + COURSES_TABLE); database.execSQL("DROP TABLE IF EXISTS " + OFFERINGS_TABLE); onCreate(database); } //********** COURSE TABLE OPERATIONS: ADD, GETALL, EDIT, DELETE public void addCourse(Course course) { SQLiteDatabase db = this.getWritableDatabase(); ContentValues values = new ContentValues(); values.put(FIELD_ALPHA, course.getAlpha()); values.put(FIELD_NUMBER, course.getNumber()); values.put(FIELD_TITLE, course.getTitle()); db.insert(COURSES_TABLE, null, values); // CLOSE THE DATABASE CONNECTION db.close(); } public ArrayList < Course > getAllCourses() { ArrayList < Course > coursesList = new ArrayList < > (); SQLiteDatabase database = this.getReadableDatabase(); //Cursor cursor = database.rawQuery(queryList, null); Cursor cursor = database.query( COURSES_TABLE, new String[] { COURSES_KEY_FIELD_ID, FIELD_ALPHA, FIELD_NUMBER, FIELD_TITLE }, null, null, null, null, null, null); //COLLECT EACH ROW IN THE TABLE if (cursor.moveToFirst()) { do { Course course = new Course(cursor.getInt(0), cursor.getString(1), cursor.getString(2), cursor.getString(3)); coursesList.add(course); } while (cursor.moveToNext()); } return coursesList; } public void deleteCourse(Course course) { SQLiteDatabase db = this.getWritableDatabase(); // DELETE THE TABLE ROW db.delete(COURSES_TABLE, COURSES_KEY_FIELD_ID + " = ?", new String[] { String.valueOf(course.getId()) }); db.close(); } public void deleteAllCourses() { SQLiteDatabase db = this.getWritableDatabase(); db.delete(COURSES_TABLE, null, null); db.close(); } public void updateCourse(Course course) { SQLiteDatabase db = this.getWritableDatabase(); ContentValues values = new ContentValues(); values.put(FIELD_ALPHA, course.getAlpha()); values.put(FIELD_NUMBER, course.getNumber()); values.put(FIELD_TITLE, course.getTitle()); db.update(COURSES_TABLE, values, COURSES_KEY_FIELD_ID + " = ?", new String[] { String.valueOf(course.getId()) }); db.close(); } public Course getCourse(int id) { SQLiteDatabase db = this.getReadableDatabase(); Cursor cursor = db.query( COURSES_TABLE, new String[] { COURSES_KEY_FIELD_ID, FIELD_ALPHA, FIELD_NUMBER, FIELD_TITLE }, COURSES_KEY_FIELD_ID + "=?", new String[] { String.valueOf(id) }, null, null, null, null); if (cursor != null) cursor.moveToFirst(); Course course = new Course( cursor.getInt(0), cursor.getString(1), cursor.getString(2), cursor.getString(3)); db.close(); return course; } //********** OFFERING TABLE OPERATIONS: ADD, GETALL, EDIT, DELETE public void addOffering(int crn, int semesterCode, int courseId) { SQLiteDatabase db = this.getWritableDatabase(); ContentValues values = new ContentValues(); values.put(OFFERINGS_KEY_FIELD_ID, crn); values.put(FIELD_SEMESTER_CODE, semesterCode); values.put(FIELD_COURSE_ID, courseId); db.insert(OFFERINGS_TABLE, null, values); // CLOSE THE DATABASE CONNECTION db.close(); } public ArrayList < Offering > getAllOfferings() { ArrayList < Offering > offeringsList = new ArrayList < > (); SQLiteDatabase database = this.getReadableDatabase(); //Cursor cursor = database.rawQuery(queryList, null); Cursor cursor = database.query( OFFERINGS_TABLE, new String[] { OFFERINGS_KEY_FIELD_ID, FIELD_SEMESTER_CODE, FIELD_COURSE_ID }, null, null, null, null, null, null); //COLLECT EACH ROW IN THE TABLE if (cursor.moveToFirst()) { do { Course course = getCourse(cursor.getInt(2)); //Instructor instructor = getInstructor(cursor.getInt(3)); Offering offering = new Offering(cursor.getInt(0), cursor.getInt(1), course); offeringsList.add(offering); } while (cursor.moveToNext()); } return offeringsList; } public void deleteOffering(Offering offering) { SQLiteDatabase db = this.getWritableDatabase(); // DELETE THE TABLE ROW db.delete(OFFERINGS_TABLE, OFFERINGS_KEY_FIELD_ID + " = ?", new String[] { String.valueOf(offering.getCRN()) }); db.close(); } public void deleteAllOfferings() { SQLiteDatabase db = this.getWritableDatabase(); db.delete(OFFERINGS_TABLE, null, null); db.close(); } public void updateOffering(Offering offering) { SQLiteDatabase db = this.getWritableDatabase(); ContentValues values = new ContentValues(); values.put(FIELD_SEMESTER_CODE, offering.getSemesterCode()); values.put(FIELD_COURSE_ID, offering.getCourse().getId()); db.update(OFFERINGS_TABLE, values, OFFERINGS_KEY_FIELD_ID + " = ?", new String[] { String.valueOf(offering.getCRN()) }); db.close(); } public Offering getOffering(int crn) { SQLiteDatabase db = this.getReadableDatabase(); Cursor cursor = db.query( OFFERINGS_TABLE, new String[] { OFFERINGS_KEY_FIELD_ID, FIELD_SEMESTER_CODE, FIELD_COURSE_ID }, OFFERINGS_KEY_FIELD_ID + "=?", new String[] { String.valueOf(crn) }, null, null, null, null); if (cursor != null) cursor.moveToFirst(); Course course = getCourse(cursor.getInt(2)); //Instructor instructor = getInstructor(cursor.getInt(3)); Offering offering = new Offering(cursor.getInt(0), cursor.getInt(1), course); db.close(); return offering; } public Cursor getAllLabelsAsCursor() { String[] columns = new String[] { "rowid AS _id, *" }; // Need _id column for SimpleCursorAdapter return this.getWritableDatabase().query(COURSES_TABLE, columns, null, null, null, null, null); } public boolean importCoursesFromCSV(String csvFileName) { AssetManager manager = mContext.getAssets(); InputStream inStream; try { inStream = manager.open(csvFileName); } catch (IOException e) { e.printStackTrace(); return false; } BufferedReader buffer = new BufferedReader(new InputStreamReader(inStream)); String line; try { while ((line = buffer.readLine()) != null) { String[] fields = line.split(","); if (fields.length != 4) { Log.d("OCC Course Finder", "Skipping Bad CSV Row: " + Arrays.toString(fields)); continue; } int id = Integer.parseInt(fields[0].trim()); String alpha = fields[1].trim(); String number = fields[2].trim(); String title = fields[3].trim(); addCourse(new Course(id, alpha, number, title)); } } catch (IOException e) { e.printStackTrace(); return false; } return true; } public boolean importOfferingsFromCSV(String csvFileName) { AssetManager am = mContext.getAssets(); InputStream inStream = null; try { inStream = am.open(csvFileName); } catch (IOException e) { e.printStackTrace(); } BufferedReader buffer = new BufferedReader(new InputStreamReader(inStream)); String line; try { while ((line = buffer.readLine()) != null) { String[] fields = line.split(","); if (fields.length != 4) { Log.d("OCC Course Finder", "Skipping Bad CSV Row: " + Arrays.toString(fields)); continue; } int crn = Integer.parseInt(fields[0].trim()); int semesterCode = Integer.parseInt(fields[1].trim()); int courseId = Integer.parseInt(fields[2].trim()); addOffering(crn, semesterCode, courseId); } } catch (IOException e) { e.printStackTrace(); return false; } return true; } } 

main activity.

 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.Button; import android.widget.EditText; import android.widget.ListView; import android.widget.SimpleCursorAdapter; import android.widget.Spinner; import android.widget.Toast; import android.util.Log; 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; public Button reset; 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"); 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); // 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[] getAllCourse1() { 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; } 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; } 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(); adapter.clear(); if (input.equals("")) { adapter.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.getTitle().toLowerCase().startsWith(input)) { adapter.add(course.getTitle()); } } } adapter.notifyDataSetChanged(); if (adapter.getCount() != 0) ok.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(); } }; } 

Activity_course_search.xml

 << ? xml version = "1.0" encoding = "utf-8" ? > < LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" xmlns: tools = "http://schemas.android.com/tools" android: id = "@+id/activity_course_search" android: layout_width = "match_parent" android: layout_height = "match_parent" android: orientation = "vertical" android: paddingBottom = "@dimen/activity_vertical_margin" android: paddingLeft = "@dimen/activity_horizontal_margin" android: paddingRight = "@dimen/activity_horizontal_margin" android: paddingTop = "@dimen/activity_vertical_margin" tools: context = "com.bar.example.myapplication.CourseSearchActivity" > < LinearLayout android: orientation = "horizontal" android: layout_width = "match_parent" android: layout_height = "wrap_content" > < TextView android: text = "Filter By Instructor" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: id = "@+id/textView" / > < Spinner android: id = "@+id/instructorSpinner" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: layout_weight = "1" / > < /LinearLayout> < LinearLayout android: orientation = "horizontal" android: layout_width = "match_parent" android: layout_height = "wrap_content" > < TextView android: text = "Filter By Course Title" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: id = "@+id/textView2" / > < EditText android: id = "@+id/courseTitleEditText" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: inputType = "textPersonName" android: ems = "10" / > < /LinearLayout> < LinearLayout android: orientation = "horizontal" android: layout_width = "match_parent" android: layout_height = "wrap_content" > < Button android: text = "@string/reset_button_text" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: layout_weight = "1" android: id = "@+id/resetButton" / > < /LinearLayout> < ListView android: id = "@+id/offeringsListView" android: layout_width = "match_parent" android: layout_height = "18dp" > < /ListView> < Spinner android: id = "@+id/spinner1" android: layout_width = "341dp" android: layout_height = "93dp" android: layout_weight = "1" / > < /LinearLayout> 

offering_list_item.xml

 << ? xml version = "1.0" encoding = "utf-8" ? > < LinearLayout xmlns : android = "http://schemas.android.com/apk/res/android" android: layout_width = "match_parent" android: layout_height = "wrap_content" android: id = "@+id/offeringListLinearLayout" > < LinearLayout android: orientation = "vertical" android: layout_width = "match_parent" android: layout_height = "match_parent" > < TextView android: text = "TextView" android: layout_width = "match_parent" android: layout_height = "wrap_content" android: textSize = "20sp" android: id = "@+id/offeringListFullNameTextView" / > < /LinearLayout> < /LinearLayout> 

Main Screen 1 :

Requirement 1 : (Working Fine) spinner selection from database.

Requirement 2 : Working but need in another way . Spinner display from database based on edittext entry using textwacher. What i want is that if enter "Number A170 then my spinner should show "title" Java Programming 1 from database

Current screen shows

I want it in this way ...

revised onTextChanged 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(); adapter.clear(); if (input.equals("")) { adapter.addAll(getAllCourse()); } else { Course course; for (int j = 0; j < CoursesList.size(); j++) { // If the course title starts with the user input, // add it to the listAdapter // course = allCoursesList.get(j); if (courseTitleEditText.getText().equals(CoursesList.get(j).get("number"))) { //adapter.add(course.getTitle()); ok.setSelection(j); } } } // adapter.notifyDataSetChanged(); //if(adapter.getCount() != 0) // ok.setSelection(i); } @Override public void afterTextChanged(Editable editable) { } }; 

Answer 1

Try this. It should solve your issue.

Replace if (course.getTitle().toLowerCase().startsWith(input)) {

with if (course.getNumber().toLowerCase().startsWith(input)) { .

Answer 2

i think i figure what do you need

actully it's little simple im try to work it with your code but not by modeling way like you it will be by hashmap array

first we need to get the data from you sqlite by using this code

THIS in class DBHelper

import java.util.HashMap;
import java.util.Map;

this the import you need here

public ArrayList<Map<String, String>> getCourses()
{
    ArrayList<Map<String, String>> array_list = new ArrayList<>();

    SQLiteDatabase db = this.getReadableDatabase();
    Cursor res =  db.rawQuery("select * from " + COURSES_TABLE, null);
    res.moveToFirst();

    while(res.isAfterLast() == false){
        Map<String, String> datanum = new HashMap<String, String>();
        datanum.put("id", res.getString(res.getColumnIndex(COURSES_KEY_FIELD_ID)));
        datanum.put("alpha", res.getString(res.getColumnIndex(FIELD_ALPHA)));
        datanum.put("number", res.getString(res.getColumnIndex(FIELD_NUMBER)));
        datanum.put("title", res.getString(res.getColumnIndex(FIELD_TITLE)));
        array_list.add(datanum);
        res.moveToNext();
    }
    return array_list;
}

this code here will work perfect with you not need to edit i make it with your class

now you need to call this method in you class

THIS in class CourseSearchActivity

DBHelper DB;
ArrayList<Map<String, String>> CoursesList = new ArrayList<Map<String, String>>();

on create

    DB = new DBHelper(this);
    CoursesList= DB.getCourses(); 

now you have all in your CoursesList now you need to figure out which spinner position you wanna to select it

so

you going to loop on it

THIS in Textlistener

    for(int i = 0 ; i < CoursesList.size() ; i++){
        if(courseTitleEditText.getText().equals(CoursesList.get(i).get("number"))){//ex.A170
// you must to be filled your spinner from same courses db and here you gonna to set your selection by iteration
            ok.setSelection(i);
        } 
    }

maybe it's not the right thing to your code because i see you use modeling in your code and i use Hashmap but i think it's useful to see the same way in your modeling from this code i didn't test it i wrote it direct so test and told me what happen hope i help