Android Spinner get data From SQLite Database

Last Tutorial about Spinner Android Working with Spinner was having static data.In this Tutorial we will getting data from database dynamically.

So Let’s Start

1.Open Eclipse or Android Studio -> New Project->Android Application Project-> Name of Application-> Follow all instructions and complete by clicking on Finish.

2.Create Layout for MainActivity.java that will be our mainscreen

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <TextView
        android:text="Username"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <EditText
        android:id="@+id/username"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:text="Password"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <EditText
        android:id="@+id/password"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/adduser"
        android:text="AddUser"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Spinner
        android:id="@+id/selectuser"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"></Spinner>

</LinearLayout>

2.Now we will make Model class as User.java for storing user information as a User Object

User.java

package com.coderzpassion.myspinnersample;



//this is model class
public class User {

    //variables
    int id;
    String name;
    String password;


    //  Constructor with two parameters name and password
    public User(String name, String password)
    {
        this.name=name;
        this.password=password;
    }
    //Parameter constructor containing all three parameters
    public User(int id, String name, String psd)
    {
        this.id=id;
        this.name=name;
        this.password=psd;

    }
    //getting id
    public int getId() {
        return id;
    }
    //setting id
    public void setId(int id) {
        this.id = id;
    }
    //getting name
    public String getName() {
        return name;
    }
    //setting name
    public void setName(String name) {
        this.name = name;
    }

    //getting password
    public String getPassword() {
        return password;
    }

    //setting password
    public void setPassword(String password) {
        this.password = password;
    }
}

3.Now We will make DbHandler.java to perform all data operations that is adding users to the database and getting all users from database to display in Spinner

DbHandler.java

package com.coderzpassion.myspinnersample;

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;

/**
 * Created by apple on 23/02/16.
 */
public class DbHandler extends SQLiteOpenHelper {

    //all constants as they are static and final(Db=Database)
    //Db Version
    private  static final int Db_Version=1;
    //Db Name
    private static final String Db_Name="users";
    //table name
    private static final String Table_Name="user";
    //Creating mycontacts Columns
    private static final String User_id="id";
    private static final String User_name="name";
    private static final String User_password="password";


    //constructor here
    public DbHandler(Context context)
    {
        super(context,Db_Name,null,Db_Version);
    }

    //creating table
    @Override
    public void onCreate(SQLiteDatabase db) {
        // writing command for sqlite to create table with required columns
        String Create_Table="CREATE TABLE " + Table_Name + "(" + User_id
                 + " INTEGER PRIMARY KEY," + User_name + " TEXT," + User_password + " TEXT" + ")";
        db.execSQL(Create_Table);
    }

    //Upgrading the Db
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        //Drop table if exists
        db.execSQL("DROP TABLE IF EXISTS " + Table_Name);
        //create the table again
        onCreate(db);
    }

    //Add new User by calling this method
    public void addUser(User usr)
    {
        // getting db instance for writing the user
        SQLiteDatabase db=this.getWritableDatabase();
        ContentValues cv=new ContentValues();
       // cv.put(User_id,usr.getId());
        cv.put(User_name,usr.getName());
        cv.put(User_password,usr.getPassword());

        //inserting row
        db.insert(Table_Name, null, cv);
        //close the database to avoid any leak
        db.close();
    }

   public int checkUser(User us)
   {
       int id=-1;
       SQLiteDatabase db=this.getReadableDatabase();
       Cursor cursor=db.rawQuery("SELECT id FROM user WHERE name=? AND password=?",new String[]{us.getName(),us.getPassword()});
       if(cursor.getCount()>0) {
           cursor.moveToFirst();
           id=cursor.getInt(0);
         cursor.close();
       }
       return id;
       }

    
    //getting all users from database
    public List<String> getAllUsers()
    {
        List<String> userlist=new ArrayList<>();
        //get readable database
        SQLiteDatabase db=this.getReadableDatabase();
        Cursor cursor=db.rawQuery("SELECT name FROM user",null);

        if(cursor.moveToFirst())
        {
            do {
                userlist.add(cursor.getString(0));
            }while (cursor.moveToNext());
        }
        //close the cursor
        cursor.close();
        //close the database
        db.close();

      return userlist;
    }

}

4. Now we are ready for MainActivity.java as we created DbHandler to store users and get all users from database.

MainActivity.java

package com.coderzpassion.myspinnersample;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
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.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    //spinner
    Spinner allusers;
    //list to be set to spinner
    List<String> users=new ArrayList<>();
   // edittext for user's name and user's password
    EditText uname,upassword;
    // Button to add user to database
    Button adduser;
    ArrayAdapter<String> adapter;
    DbHandler db;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        allusers=(Spinner)findViewById(R.id.selectuser);
        uname=(EditText)findViewById(R.id.username);
        upassword=(EditText)findViewById(R.id.password);
        adduser=(Button)findViewById(R.id.adduser);
        db=new DbHandler(MainActivity.this);


        //handling click of adduser button
        adduser.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String username=uname.getText().toString();
                String password=upassword.getText().toString();
                if(username.equalsIgnoreCase("")||password.equalsIgnoreCase(""))
                {
                    Toast.makeText(MainActivity.this,"Please Enter Username and Password",Toast.LENGTH_SHORT).show();
                }
                else
                {
                    db.addUser(new User(username,password));
                    prepareData();

                    Toast.makeText(MainActivity.this,"User was Successfully added to Database",Toast.LENGTH_SHORT).show();
                }
            }
        });

        //prepare  data for spinner
        prepareData();


        //handle click of spinner item
        allusers.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

                // clicked item will be shown as spinner
                Toast.makeText(getApplicationContext(),""+parent.getItemAtPosition(position).toString(),Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
    });

    }

    public void prepareData()
    {
         users=db.getAllUsers();
        //adapter for spinner
        adapter=new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_spinner_dropdown_item,android.R.id.text1,users);
        //attach adapter to spinner
        allusers.setAdapter(adapter);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.coderzpassion.myspinnersample" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Output

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Android Spinner get data From SQLite Database

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