sqlite database into spinner in android

in this Article today learn how to get data from sqlite database into spinner in android.

follow the full source code how to get data from sqlite database into spinner in android:

1.MainActivity.java:

import android.content.Context;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.view.inputmethod.InputMethodManager;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Spinner;

import android.widget.Toast;

import java.util.List;

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {

Spinner spinner;

Button btnAdd;

EditText inputLabel;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

spinner = findViewById(R.id.spinner);

btnAdd = findViewById(R.id.btn_add);

inputLabel = findViewById(R.id.input_label);

spinner.setOnItemSelectedListener(this);

// Loading spinner data from database

loadSpinnerData();

btnAdd.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View arg0) {

String label = inputLabel.getText().toString();

if (label.trim().length() > 0) {

DatabaseHandler db = new DatabaseHandler(getApplicationContext());

db.insertLabel(label);

// making input filed text to blank

inputLabel.setText("");

// Hiding the keyboard

InputMethodManager imm = (InputMethodManager)

getSystemService(Context.INPUT_METHOD_SERVICE);

imm.hideSoftInputFromWindow(inputLabel.getWindowToken(), 0);

// loading spinner with newly added data

loadSpinnerData();

} else {

Toast.makeText(getApplicationContext(), "Please enter label name",

Toast.LENGTH_SHORT).show();

}

});

}

/**

* Function to load the spinner data from SQLite database

* */

private void loadSpinnerData() {

DatabaseHandler db = new DatabaseHandler(getApplicationContext());

List<String> labels = db.getAllLabels();

// Creating adapter for spinner

ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, labels);

// Drop down layout style - list view with radio button

dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

// attaching data adapter to spinner

spinner.setAdapter(dataAdapter);

}

@Override

public void onItemSelected(AdapterView<?> parent, View view, int position,

long id) {

// On selecting a spinner item

String label = parent.getItemAtPosition(position).toString();

// Showing selected spinner item

Toast.makeText(parent.getContext(), "You selected: " + label,

Toast.LENGTH_LONG).show();

}

@Override

public void onNothingSelected(AdapterView<?> arg0) {

// TODO Auto-generated method stub

}

2.activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity">

<EditText

android:id="@+id/input_label"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentTop="true"

android:layout_centerHorizontal="true"

android:layout_marginTop="46dp"

android:hint="Add item"

android:ems="10" />

<Button

android:id="@+id/btn_add"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_below="@+id/input_label"

android:layout_centerHorizontal="true"

android:layout_marginTop="67dp"

android:text="Add item" />

<Spinner

android:id="@+id/spinner"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_alignParentLeft="true"

android:layout_alignParentStart="true"

android:layout_below="@+id/btn_add"

android:layout_marginTop="70dp" />

</RelativeLayout>

3.DatabaseHandler.java:

import android.content.ContentValues;

import android.content.Context;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteOpenHelper;

import java.util.ArrayList;

import java.util.List;

public class DatabaseHandler extends SQLiteOpenHelper {

private static final int DATABASE_VERSION = 1;

private static final String DATABASE_NAME = "spinnerExample";

private static final String TABLE_NAME = "labels";

private static final String COLUMN_ID = "id";

private static final String COLUMN_NAME = "name";

public DatabaseHandler(Context context) {

super(context, DATABASE_NAME, null, DATABASE_VERSION);

}

// Creating Tables

@Override

public void onCreate(SQLiteDatabase db) {

// Category table create query

String CREATE_ITEM_TABLE = "CREATE TABLE " + TABLE_NAME + "("

+ COLUMN_ID + " INTEGER PRIMARY KEY," + COLUMN_NAME + " TEXT)";

db.execSQL(CREATE_ITEM_TABLE);

}

// Upgrading database

@Override

public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

// Drop older table if existed

db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);

// Create tables again

onCreate(db);

}

/**

* Inserting new lable into lables table

* */

public void insertLabel(String label){

SQLiteDatabase db = this.getWritableDatabase();

ContentValues values = new ContentValues();

values.put(COLUMN_NAME, label);//column name, column value

// Inserting Row

db.insert(TABLE_NAME, null, values);//tableName, nullColumnHack, CotentValues

db.close(); // Closing database connection

}

/**

* Getting all labels

* returns list of labels

* */

public List<String> getAllLabels(){

List<String> list = new ArrayList<String>();

// Select All Query

String selectQuery = "SELECT * FROM " + TABLE_NAME;

SQLiteDatabase db = this.getReadableDatabase();

Cursor cursor = db.rawQuery(selectQuery, null);//selectQuery,selectedArguments

// looping through all rows and adding to list

if (cursor.moveToFirst()) {

do {

list.add(cursor.getString(1));//adding 2nd column data

} while (cursor.moveToNext());

}

// closing connection

cursor.close();

db.close();

// returning lables

return list;

}

4.AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.example.sqlitespinner"

android:versionCode="1"

android:versionName="1.0" >

<uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="16" />

<application

android:allowBackup="true"

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme" >

<activity

android:name=".MainActivity"

android:label="@string/app_name" >

<intent-filter>

</intent-filter>

</activity>

</application>

</manifest>

5.strings.xml:

<?xml version="1.0" encoding="utf-8"?>

<string name="app_name">Sqlite Spinner</string>

<string name="hello_world">Hello world!</string>

<string name="menu_settings">Settings</string>

</resources>

6.styles.xml:

<!--

Base application theme, dependent on API level. This theme is replaced

by AppBaseTheme from res/values-vXX/styles.xml on newer devices.

-->

<!--

Theme customizations available in newer API levels can go in

res/values-vXX/styles.xml, while customizations related to

backward-compatibility can go here.

-->

</style>

</style>

</resources>

Android Tutorial

Sunday 6 December 2020

sqlite database into spinner in android