We will be building a simple application in which we will be adding data to the SQLite database.
Note that we are going to implement this project using the Java language.
In the following example we will create a database for adding course name, course description, course duration, and course tracks. We will save all this data in our SQLite database (coursedb).
Step 1: Create a New Project
Step 2: Add permissions to access the storage in the AndroidManifest.xml file
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
Step 3: Working with the activity_main.xml file
Navigate to the app > res > layout > activity_main.xml and add the below code to that file.
<?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:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<!--Edit text to enter course name-->
<EditText
android:id="@+id/idEdtCourseName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:hint="Enter course Name" />
<!--edit text to enter course duration-->
<EditText
android:id="@+id/idEdtCourseDuration"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:hint="Enter Course Duration" />
<!--edit text to display course tracks-->
<EditText
android:id="@+id/idEdtCourseTracks"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:hint="Enter Course Tracks" />
<!--edit text for course description-->
<EditText
android:id="@+id/idEdtCourseDescription"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:hint="Enter Course Description" />
<!--button for adding new course-->
<Button
android:id="@+id/idBtnAddCourse"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:text="Add Course"
android:textAllCaps="false" />
</LinearLayout>
Step 4: Creating a new Java class for performing SQLite operations.
Navigate to the app > java > your app’s package name > Right-click on it > New > Java class and name it as DBHandler (You can name it different too.) and add the below code to it.
import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DBHandler extends SQLiteOpenHelper {
// creating a constant variables for our database.
// below variable is for our database name.
private static final String DB_NAME = "coursedb";
// below int is our database version
private static final int DB_VERSION = 1;
// below variable is for our table name.
private static final String TABLE_NAME = "mycourses";
// below variable is for our id column.
private static final String ID_COL = "id";
// below variable is for our course name column
private static final String NAME_COL = "name";
// below variable id for our course duration column.
private static final String DURATION_COL = "duration";
// below variable for our course description column.
private static final String DESCRIPTION_COL = "description";
// below variable is for our course tracks column.
private static final String TRACKS_COL = "tracks";
// creating a constructor for our database handler.
public DBHandler(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}
// below method is for creating a database by running a sqlite query
@Override
public void onCreate(SQLiteDatabase db) {
// on below line we are creating
// an sqlite query and we are
// setting our column names
// along with their data types.
String query = "CREATE TABLE " + TABLE_NAME + " ("
+ ID_COL + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ NAME_COL + " TEXT,"
+ DURATION_COL + " TEXT,"
+ DESCRIPTION_COL + " TEXT,"
+ TRACKS_COL + " TEXT)";
// at last we are calling a exec sql
// method to execute above sql query
db.execSQL(query);
}
// this method is use to add new course to our sqlite database.
public void addNewCourse(String courseName, String courseDuration, String courseDescription, String courseTracks) {
// on below line we are creating a variable for
// our sqlite database and calling writable method
// as we are writing data in our database.
SQLiteDatabase db = this.getWritableDatabase();
// on below line we are creating a
// variable for content values.
ContentValues values = new ContentValues();
// on below line we are passing all values
// along with its key and value pair.
values.put(NAME_COL, courseName);
values.put(DURATION_COL, courseDuration);
values.put(DESCRIPTION_COL, courseDescription);
values.put(TRACKS_COL, courseTracks);
// after adding all values we are passing
// content values to our table.
db.insert(TABLE_NAME, null, values);
// at last we are closing our
// database after adding database.
db.close();
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// this method is called to check if the table exists already.
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
}
Step 5: Working with the MainActivity.java file.
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
// creating variables for our edittext, button and dbhandler
private EditText courseNameEdt, courseTracksEdt, courseDurationEdt, courseDescriptionEdt;
private Button addCourseBtn;
private DBHandler dbHandler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// initializing all our variables.
courseNameEdt = findViewById(R.id.idEdtCourseName);
courseTracksEdt = findViewById(R.id.idEdtCourseTracks);
courseDurationEdt = findViewById(R.id.idEdtCourseDuration);
courseDescriptionEdt = findViewById(R.id.idEdtCourseDescription);
addCourseBtn = findViewById(R.id.idBtnAddCourse);
// creating a new dbhandler class
// and passing our context to it.
dbHandler = new DBHandler(MainActivity.this);
// below line is to add on click listener for our add course button.
addCourseBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// below line is to get data from all edit text fields.
String courseName = courseNameEdt.getText().toString();
String courseTracks = courseTracksEdt.getText().toString();
String courseDuration = courseDurationEdt.getText().toString();
String courseDescription = courseDescriptionEdt.getText().toString();
// validating if the text fields are empty or not.
if (courseName.isEmpty() && courseTracks.isEmpty() && courseDuration.isEmpty() && courseDescription.isEmpty()) {
Toast.makeText(MainActivity.this, "Please enter all the data..", Toast.LENGTH_SHORT).show();
return;
}
// on below line we are calling a method to add new
// course to sqlite data and pass all our values to it.
dbHandler.addNewCourse(courseName, courseDuration, courseDescription, courseTracks);
// after adding the data we are displaying a toast message.
Toast.makeText(MainActivity.this, "Course has been added.", Toast.LENGTH_SHORT).show();
courseNameEdt.setText("");
courseDurationEdt.setText("");
courseTracksEdt.setText("");
courseDescriptionEdt.setText("");
}
});
}
}
Now run your app and see the output of the app.