Teams Winter 2011/team2/lab5

Team 2 -ECL500 Android Application Development with Eclipse - Lab 5

For this lab, we will create a small Android application called Parking that will search in a database and shows number of cars based on searched brand and model.

Prepare Environment

1. First we have to install Android SDk. the latest version is in AnDroidSDK.

• we can install different virtual machines with this SDK manager

2. Then we have to prepare Eclipse for developing Android by going to Help -> install new software. and add https://dl-ssl.google.com/android/eclipse/ repository.
3. Then in Windows-> preference -> Android we have to set location of SDK that we installed at step 1

Start Application and coding

1. start a New Android Project by choosing File -> New -> Android Project
2. Type Project Name and Properties of App ( for convenience you can choose create project from existing Sample)

3. Eclipse SDK give developers a GUI interface to design Application easy. by click on res->layout->main.xml developer can design the Application

4.Now we can write code of classes

DatabaseHelper.java

package Parking.Garage;


import java.util.ArrayList;


import android.app.AlertDialog;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase;
import android.hardware.SensorManager;
import android.provider.SyncStateContract.Constants;


public class DatabaseHelper extends SQLiteOpenHelper {
	private static final String DATABASE_NAME = "car_db";
	private static final String BRAND = "brand";
	private static final String MODEL = "model";
	private static final String COUNT = "count";
	
	public DatabaseHelper(Context context) {
		super(context, getDatabaseName(), null, 1);
		// TODO Auto-generated constructor stub
		//openNewDb();
	}


	@Override
	public void onCreate(SQLiteDatabase db) {
		// TODO Auto-generated method stub


		//db.execSQL("DROP TABLE Cars;");
		db.execSQL("CREATE TABLE Cars (car_id INTEGER PRIMARY KEY AUTOINCREMENT, brand TEXT, model TEXT, count INTEGER);");
		
		ContentValues cv = new ContentValues();
			
		cv.put(getBrand(), "Bentley");
		cv.put(getModel(), "Continental GT");
		cv.put(COUNT, 1);
		db.insert("Cars", getBrand(), cv );
		
		cv.put(getBrand(), "Honda");
		cv.put(getModel(), "Accord");
		cv.put(COUNT, 23);
		db.insert("Cars", getBrand(), cv );
		
		cv.put(getBrand(), "Honda");
		cv.put(getModel(), "Civic");
		cv.put(COUNT, 35);
		db.insert("Cars", getBrand(), cv );


		cv.put(getBrand(), "Honda");
		cv.put(getModel(), "Prelude");
		cv.put(COUNT, 40);
		db.insert("Cars", getBrand(), cv );
		
		cv.put(getBrand(), "Mazda");
		cv.put(getModel(), "5");
		cv.put(COUNT, 7);
		db.insert("Cars", getBrand(), cv );


		cv.put(getBrand(), "Mazda");
		cv.put(getModel(), "3");
		cv.put(COUNT, 5);
		db.insert("Cars", getBrand(), cv );
		
		cv.put(getBrand(), "Mazda");
		cv.put(getModel(), "626");
		cv.put(COUNT, 2);
		db.insert("Cars", getBrand(), cv );
		
		cv.put(getBrand(), "Mazda");
		cv.put(getModel(), "323");
		cv.put(COUNT, 6);
		db.insert("Cars", getBrand(), cv );
	
		cv.put(getBrand(), "Nissan");
		cv.put(getModel(), "Maxima");
		cv.put(COUNT, 90);
		db.insert("Cars", getBrand(), cv );
		
		
		cv.put(getBrand(), "Nissan");
		cv.put(getModel(), "Altima");
		cv.put(COUNT, 1);
		db.insert("Cars", getBrand(), cv );
		
		cv.put(getBrand(), "Nissan");
		cv.put(getModel(), "Sentra");
		cv.put(COUNT, 3);
		db.insert("Cars", getBrand(), cv );
	}


	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
	{
		// TODO Auto-generated method stub
		android.util.Log.w("Cars","Upgrading database, which will destroy all old data");
		db.execSQL("DROP TABLE IF EXISTS Cars");
		onCreate(db);
	}
	
	public SQLiteDatabase openNewDb()
	{
		SQLiteDatabase db = this.getWritableDatabase();
		return db;
	}


	
	public ArrayList<String> getCar(SQLiteDatabase db, String userBrand, String userModel){
		//db = getWritableDatabase();
		ArrayList<String> list = new ArrayList<String>();	
		String brandTemp = "";
		String modelTemp = "";
		int    countTemp =0;
		String[] inputs = {userModel, userBrand};
		Cursor c = db.rawQuery("SELECT brand, model, count FROM Cars WHERE " + MODEL + "= ? AND " + BRAND + " = ?", inputs );
		c.moveToFirst();
		while(!c.isAfterLast())
		{
			brandTemp = c.getString(0);
			modelTemp = c.getString(1);
			countTemp = c.getInt(2);
			c.moveToNext();
		}
		c.close();
		list.add(brandTemp);
		list.add(modelTemp);
		list.add(countTemp + "");
		return list;
	}


	public static String getBrand() {
		return BRAND;
	}


	public static String getModel() {
		return MODEL;
	}


	public static String getDatabaseName() {
		return DATABASE_NAME;
	}
}

Park.java

package Parking.Garage;

import java.util.ArrayList;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class Park extends Activity implements OnClickListener {
	Button btnSearch;
	Button btnCreate;
	EditText editModel, editBrand;
	DatabaseHelper carModel = new DatabaseHelper(this);
	SQLiteDatabase db;
	ArrayList<String> cars = new ArrayList<String>();
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       
        btnSearch = (Button) findViewById(R.id.btnSearch);
        btnSearch.setOnClickListener(this);
        btnCreate = (Button) findViewById(R.id.btnCreate);
        btnCreate.setOnClickListener(this);
                
        editBrand = (EditText) findViewById(R.id.editBrand);
        editModel = (EditText) findViewById(R.id.editModel);
    }
	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		
		String brand = editBrand.getText().toString();
		String model = editModel.getText().toString();
		if(v == btnSearch)
		{
			if(brand.isEmpty()||model.isEmpty())
			{
				new AlertDialog.Builder(this)
				.setTitle("Empty Fields")
				.setMessage("All fields are mandatory")
				.setNeutralButton("Close", null)
				.show();
			}
			else
			{
				db = carModel.openNewDb();
				cars = carModel.getCar(db, brand, model);
				int a = cars.size();
				if(a == 0)
				{
					editBrand.setText("nothing");
				}
				else
				{
					String carBrand = cars.get(0);
					String carModell = cars.get(1);
					String carCount = cars.get(2);
					
					new AlertDialog.Builder(this)
					.setTitle("Car Information")
					.setMessage("Brand: " + carBrand + "\n" +
							"Model: " + carModell + "\n" +
							"Count: " + carCount )
					.setNeutralButton("Done", null)
					.show();
				}	
			}
		}
		else if (v == btnCreate)
		{
	
			editBrand.setText(brand);
			editModel.setText(model);
		}
	}
}

Running Application

For running the Application we have to click on run and it will run Android SDK and runn application