SQLite Database Tutorial In Android

SQLite Database Tutorial In Android Pos ted on J uly 9, 2018 by Bhadres h

S QLite Databas e in Android us ed to s tore pers is tent data. If you want to s tore s ome data into local s torage then S QLite Databas e is the mos t common s torage option. It is lightweight databas e that comes with Android OS .

In Android T here are others data s torage options als o available Like S hared Preference to s tore s mall amount of data in form of Key / Value pair.

S QLite Databas e File S ys tem Here we are going to learn how to us e SQLite Databas e in Android application. S QLite is an open s ource S QL databas e which s tore the data into text le on android device. S QLite databas e in android als o s upport relational databas e features .

In order to acces s S QLite Databas e you don’t need to es tablis h any kind of connections like J DBC, ODBC. 1. Overview In this tutorial we are going to create Student App to learn all the operation related the S QLite Databas e. T he app is very s imple and which allow us to ins ert, update, delete and view s tudent data. We will us e 2 s creen to perform all this operations . In rs t s creen we fetch full lis t of s tudent from the s tudent table while us ing s econd s creen update or add new s tudent record.

Following is the S tudent app s creen s hot.

Now let’s start by creating new project in Android Studio.

2. Create / Setup Project 1. Create a new project in Android Studio from File ⇒ New Project and select Basic Activity from the templates.

2. Open build.gradle under app directory and add CardView library. CardView is used to display Student List inside the Card.

1 dependencies { 2 //...

3 4 implementation 'com.android.support:cardview-v7:27.1.1' 5 6 //...

7 8 }

3. Add following code into colors.xml and strings.xml les. colors.xml colors.xml

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<?xml version="1.0" encoding="utf-8"?> <resources> <color name="colorPrimary">#3F51B5</color> <color name="colorPrimaryDark">#303F9F</color> <color name="colorAccent">#FF4081</color> <color name="mainText">#212121</color> <color name="subText">#737373</color> <color name="view">#c0c0c0</color> <color name="colorWhite">#ffffff</color> </resources>

strings.xml strings.xml

1 <resources> 2 <string name="app_name">Student Management</string> 3 <string name="strAddNewStudent">Add New Student</string> 4 <string name="strUpdateStudent">Update Student</string> 5 <string name="strDelete">Delete</string> 6 <string name="strStudentName">Enter Student Name</string> 7 <string name="strStudentResult">Enter Pass/Fail</string> 8 <string name="strStudentGrade">Enter Grade</string> 9 <string name="strSave">Save</string> 10 </resources>

4. Create following packages named adapter, db, model and ui. The following is the nal project structure and les are required.

3. Create SQLite Helper Classes 5. In this tutorial we have taken student example to perform all operation. So rst we need to create one model class named StudentInfo.java under model package. StudentInfo.java contain student information like id, name, grade and result. Further we will used this class to store and retrieve student information from the SQLite database.

StudentInfo.java

1 public class StudentInfo { 2 3 int studentId; 4 String studentName, studentResult, studentGrade; 5 6 public StudentInfo() { 7 8 } 9 10 public StudentInfo(int studentId) { 11 this.studentId = studentId; 12 } 13 14 public StudentInfo(String studentName, String studentResult, String studentGrade) { 15 this.studentName = studentName; 16 this.studentResult = studentResult; 17 this.studentGrade = studentGrade; 18 } 19 20 public StudentInfo(int studentId, String studentName, String studentResult, String studentGrade) { 21 this.studentId = studentId; 22 this.studentName = studentName; 23 this.studentResult = studentResult; 24 this.studentGrade = studentGrade; 25 } 26 27 public int getStudentId() { 28 return studentId;

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} public void setStudentId(int studentId) { this.studentId = studentId; } public String getStudentName() { return studentName; } public void setStudentName(String studentName) { this.studentName = studentName; } public String getStudentResult() { return studentResult; } public void setStudentResult(String studentResult) { this.studentResult = studentResult; } public String getStudentGrade() { return studentGrade; } public void setStudentGrade(String studentGrade) { this.studentGrade = studentGrade; }

6. Now we need to create a class that extends from SQLiteOpenHelper. So create DBHelper.java under db package.

DBHelper.java perform all the database operations like Create, Update, Delete and Read.

Before the proceed letâ&#x20AC;&#x2122;s understand use of all the methods and table structure of the StudentInfo. onCreate() method will be called only once when application launch rst time in android phone. So from this method we will execute sql statement to create Student table. onUpgrade() method will be called when update the application. You need to change the DB_VERSION in order to execute this methods.

The StudentInfo table needs four column : _id, name, result and grade.

Column _id is declared as Primary Key and Auto Increment which means it is unique key to identify the Students. name contains student name, result is ether pass or fail, grade contains student grade.

So let add the following code into DBHelper Class.

DBHelper.java

1 public class DBHelper extends SQLiteOpenHelper{ 2 3 // Database Name 4 static final String DATABASE = "student.db"; 5 6 // Database Version 7 static final int DB_VERSION = 1; 8 9 // Table Name 10 static final String TABLE = "StudentInfo"; 11 12 // Table Field Name 13 static final String S_ID = "_id"; 14 static final String S_NAME = "name"; 15 static final String S_RESULT = "result"; 16 static final String S_GRADE = "grade"; 17 18 // Override constructor 19 public DBHelper(Context context) { 20 super(context, DATABASE, null, DB_VERSION); 21 } 22 23 @Override 24 public void onCreate(SQLiteDatabase db) { 25 // Create StudentInfo table using SQL query 26 db.execSQL("CREATE TABLE " + TABLE + " ( " + S_ID 27 + " INTEGER PRIMARY KEY AUTOINCREMENT, " + S_NAME + " text, " 28 + S_RESULT + " text, " + S_GRADE + " text )"); 29 } 30 31 @Override 32 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 33

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// Drop old version table db.execSQL("Drop table " + TABLE);

}

// Create New Version table onCreate(db);

7. Now we need to implement four methods to perform CRUD [Create, Read, Update, Delete] operations with student data.

Letâ&#x20AC;&#x2122;s have look of each methods.

7.1 Insert Student Data Inserting data requires writable instance of the SQLiteDatabase So Create instance using getWritableDatabase().

ContentValues() is used to add database values in respective column. So setup all the value with respective column in ContentValues() , Skip _id because itâ&#x20AC;&#x2122;s auto inserted.

Close the database connection after inserting is done. addStudentDetails

1 public void addStudentDetails(StudentInfo studInfo) { 2 3 SQLiteDatabase db = this.getWritableDatabase(); 4 5 ContentValues values = new ContentValues(); 6 values.put(S_NAME, studInfo.getStudentName()); 7 values.put(S_RESULT, studInfo.getStudentResult()); 8 values.put(S_GRADE, studInfo.getStudentGrade()); 9 10 // Inserting Row 11 db.insert(TABLE, null, values); 12 db.close(); 13 }

7.2 Update Student Data.

Updating data also requiring writable access of the SQLiteDatabase. Student data will be updated using _id column. updateStudentDetails

1 public int updateStudentDetails(StudentInfo studInfo) { 2 3 SQLiteDatabase db = this.getWritableDatabase(); 4 5 ContentValues values = new ContentValues(); 6 values.put(S_NAME, studInfo.getStudentName()); 7 values.put(S_RESULT, studInfo.getStudentResult()); 8 values.put(S_GRADE, studInfo.getStudentGrade()); 9 10 // updating row 11 return db.update(TABLE, values, S_ID + " = ?", 12 new String[]{String.valueOf(studInfo.getStudentId())}); 13 }

7.3 Delete Student Data.

To delete student data we also required to declare SQLiteDatabase instance with writable access. The following methods will be Delete speci ed student record from the database using _id deleteStudentDetails

1 public void deleteStudentDetails(StudentInfo studentInfo) { 2 3 SQLiteDatabase db = this.getWritableDatabase(); 4 5 db.delete(TABLE, S_ID + " = ?", 6 new String[]{String.valueOf(studentInfo.getStudentId())}); 7 db.close(); 8 }

7.4 Fetch Student Data To read data from the database table requires SQLiteDatabase instance as a read access. For that we can de ne SQLiteDatabase instance using getReadableDatabase().

Following method will fetch all students data from the database table. getStudentDetails

1 public List<StudentInfo> getStudentDetails() {

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 }

List<StudentInfo> StudentList = new ArrayList<>();

// Select All Query String selectQuery = "SELECT * FROM " + TABLE; SQLiteDatabase db = this.getWritableDatabase(); Cursor cursor = db.rawQuery(selectQuery, null); // looping through all rows and adding to list if (cursor.moveToFirst()) { do { StudentInfo studentInfo = new StudentInfo(); studentInfo.setStudentId(cursor.getInt(0)); studentInfo.setStudentName(cursor.getString(1)); studentInfo.setStudentResult(cursor.getString(2)); studentInfo.setStudentGrade(cursor.getString(3));

}

// Adding student information to list StudentList.add(studentInfo); } while (cursor.moveToNext());

cursor.close(); return StudentList;

So add all above methods into DBHelper.java class, The nal code of the DBHelper.java class looks like this.

DBHelper.java

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package dwi.db.operations.student.management.db; 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; import dwi.db.operations.student.management.model.StudentInfo; public class DBHelper extends SQLiteOpenHelper{

// Static Final Variable database meta information static final String DATABASE = "student.db"; static final int DB_VERSION = 1; static final String TABLE = "StudentInfo"; static final String S_ID = "_id"; static final String S_NAME = "name"; static final String S_RESULT = "result"; static final String S_GRADE = "grade"; // Override constructor public DBHelper(Context context) { super(context, DATABASE, null, DB_VERSION); } @Override public void onCreate(SQLiteDatabase db) { // Create StudentInfo table using SQL query db.execSQL("CREATE TABLE " + TABLE + " ( " + S_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + S_NAME + " text, " + S_RESULT + " text, " + S_GRADE + " text )"); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

// Drop old version table db.execSQL("Drop table " + TABLE);

}

// Create New Version table onCreate(db);

// Adding new detail public void addStudentDetails(StudentInfo studInfo) { SQLiteDatabase db = this.getWritableDatabase(); ContentValues values = new ContentValues(); values.put(S_NAME, studInfo.getStudentName()); values.put(S_RESULT, studInfo.getStudentResult()); values.put(S_GRADE, studInfo.getStudentGrade()); // Inserting Row db.insert(TABLE, null, values); db.close(); // Closing database connection } // Updating details public int updateStudentDetails(StudentInfo studInfo) { SQLiteDatabase db = this.getWritableDatabase(); ContentValues values = new ContentValues();

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}

values.put(S_NAME, studInfo.getStudentName()); values.put(S_RESULT, studInfo.getStudentResult()); values.put(S_GRADE, studInfo.getStudentGrade()); // updating row return db.update(TABLE, values, S_ID + " = ?", new String[]{String.valueOf(studInfo.getStudentId())});

// Deleting single recoed public void deleteStudentDetails(StudentInfo studentInfo) { SQLiteDatabase db = this.getWritableDatabase(); db.delete(TABLE, S_ID + " = ?", new String[]{String.valueOf(studentInfo.getStudentId())}); db.close(); } // Get all student information public List<StudentInfo> getStudentDetails() { List<StudentInfo> StudentList = new ArrayList<>(); // Select All Query String selectQuery = "SELECT * FROM " + TABLE; SQLiteDatabase db = this.getWritableDatabase(); Cursor cursor = db.rawQuery(selectQuery, null); // looping through all rows and adding to list if (cursor.moveToFirst()) { do { StudentInfo studentInfo = new StudentInfo(); studentInfo.setStudentId(cursor.getInt(0)); studentInfo.setStudentName(cursor.getString(1)); studentInfo.setStudentResult(cursor.getString(2)); studentInfo.setStudentGrade(cursor.getString(3)); // Adding student information to list StudentList.add(studentInfo); } while (cursor.moveToNext()); } cursor.close(); return StudentList; }

4. Create List Adapter 8. Create new layout les under layout folder named student_list_row.xml. This layout le holds single items in list. student_list_row.xml

1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 xmlns:app="http://schemas.android.com/apk/res-auto" 4 xmlns:card_view="http://schemas.android.com/apk/res-auto" 5 android:layout_width="match_parent" 6 android:layout_height="match_parent" 7 android:orientation="horizontal"> 8 <android.support.v7.widget.CardView 9 android:id="@+id/card_view" 10 android:layout_width="fill_parent" 11 android:layout_height="wrap_content" 12 android:layout_marginTop="@dimen/_15sdp" 13 android:layout_marginLeft="@dimen/_5sdp" 14 android:layout_marginRight="@dimen/_5sdp" 15 app:cardBackgroundColor="#FFFFFF" 16 card_view:cardCornerRadius="2dp" 17 card_view:contentPadding="10dp"> 18 <LinearLayout 19 android:orientation="horizontal" 20 android:layout_width="match_parent" 21 android:layout_height="match_parent"> 22 <LinearLayout 23 android:orientation="vertical" 24 android:layout_weight="0.5" 25 android:layout_width="match_parent" android:layout_height="match_parent"> 26 <TextView 27 android:id="@+id/txtName" 28 android:hint="Name" 29 android:layout_weight="6" 30 android:textSize="15dp" 31 android:textColor="#000" 32 android:layout_gravity="center" 33 android:layout_width="match_parent" 34 android:layout_height="wrap_content" 35 android:padding="5dp" /> 36 <TextView 37 android:id="@+id/txtStatus" 38 android:hint="Status" 39 android:layout_weight="6" 40 android:textSize="15dp" 41 android:textColor="#000" 42 android:layout_gravity="center" 43 android:layout_width="match_parent"

44 android:layout_height="wrap_content" 45 android:padding="5dp" /> 46 <TextView 47 android:id="@+id/txtGrade" 48 android:hint="Grade" 49 android:layout_weight="6" 50 android:textSize="15dp" 51 android:textColor="#000" 52 android:layout_gravity="center" 53 android:layout_width="match_parent" 54 android:layout_height="wrap_content" 55 android:padding="5dp" /> 56 </LinearLayout> 57 <LinearLayout 58 android:layout_weight="1.9" 59 android:orientation="vertical" 60 android:layout_width="match_parent" 61 android:layout_height="match_parent"> 62 <ImageView 63 android:id="@+id/imgEdit" 64 android:layout_weight="2" 65 android:src="@drawable/ic_edit" 66 android:layout_width="@dimen/_20sdp" 67 android:layout_height="@dimen/_20sdp" 68 android:layout_gravity="center" 69 /> 70 <ImageView 71 android:id="@+id/imgDelete" 72 android:layout_weight="2" 73 android:src="@drawable/ic_delete" 74 android:layout_width="@dimen/_20sdp" 75 android:layout_height="@dimen/_20sdp" 76 android:layout_gravity="center" 77 /> 78 </LinearLayout> 79 </LinearLayout> 80 81 </android.support.v7.widget.CardView> 82 </LinearLayout>

9. Now create the new class named StudentListAdapter.java under adapter package.

This is the Student List adapter and it will show you all the student records from the database.

From the list you can Delete or Update particular student data by tapping on Delete or Update button.

StudentListAdapter

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public class StudentListAdapter extends ArrayAdapter<StudentInfo> {

// Context Objects Context context; MainActivity display_data; // Primitive Variables public List<StudentInfo> productList; public static LayoutInflater inflater = null; // DB Objects DBHelper db; public StudentListAdapter(@NonNull Context context, int resource, List<StudentInfo> productList) { super(context, resource, productList); this.context = context; this.productList = productList; db = new DBHelper(context); display_data = (MainActivity) this.context; inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } @Override public StudentInfo getItem(int position) { return productList.get(position); } @NonNull @Override public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) { ViewProHolder holder; if (convertView == null) { View view = inflater.inflate(R.layout.student_list_row, null); holder = ViewProHolder.create((LinearLayout) view); view.setTag(holder); } else { holder = (ViewProHolder) convertView.getTag(); } try { final StudentInfo item = getItem(position); holder.txtName.setText(item.getStudentName());

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}

holder.txtStatus.setText(item.getStudentResult()); holder.txtGrade.setText(item.getStudentGrade()); // Update Student Data holder.imgEdit.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(context, AddUpdateDetailsActivity.class); intent.putExtra("sid", item.getStudentId()); intent.putExtra("sname", item.getStudentName()); intent.putExtra("sstatus", item.getStudentResult()); intent.putExtra("sgrade", item.getStudentGrade()); MainActivity.opration = 1; display_data.startActivityForResult(intent, 1); } }); // Delete Student Data holder.imgDelete.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { try { AlertDialog.Builder alertDialog = new AlertDialog.Builder(context); // Setting Dialog Title alertDialog.setTitle("Confirm Delete..."); // Setting Dialog Message alertDialog.setMessage("Are you sure you want delete this?"); // Setting Icon to Dialog alertDialog.setIcon(R.drawable.ic_delete); // Setting Positive "Yes" Button alertDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { db.deleteStudentDetails(new StudentInfo(item.getStudentId())); display_data.bindStudentData(); } }); // Setting Negative "NO" Button alertDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); alertDialog.show(); } catch (Exception e) { Log.e("Error ", e.getMessage()); e.printStackTrace(); } } }); } catch (Exception e) { Log.e("Error in adapter: ", e.getMessage()); e.printStackTrace(); } return holder.view;

public static class ViewProHolder { public final LinearLayout view; TextView txtName, txtStatus, txtGrade; ImageView imgEdit; ImageView imgDelete; public ViewProHolder(LinearLayout view, TextView tv_name, TextView tv_status, TextView im_icon, ImageView im_edit, ImageView im_delete) { this.view = view; this.txtName = tv_name; this.txtStatus = tv_status; this.txtGrade = im_icon; this.imgEdit = im_edit; this.imgDelete = im_delete; } public static ViewProHolder create(LinearLayout view) { // Widget GUI Init TextView tv_name = view.findViewById(R.id.txtName); TextView tv_status = view.findViewById(R.id.txtStatus); TextView tv_grade = view.findViewById(R.id.txtGrade); ImageView im_edit = view.findViewById(R.id.imgEdit); ImageView im_delete = view.findViewById(R.id.imgDelete); return new ViewProHolder(view, tv_name, tv_status, tv_grade, im_edit, im_delete); } }

5. Create Add / Update Activity 10. Create new layout les under layout folder named activity_add_update.xml. This the layout of Add / Update student data activity. activity_add_update.xml

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

2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 xmlns:tools="http://schemas.android.com/tools" 4 android:layout_width="match_parent" 5 android:layout_height="match_parent" 6 android:orientation="vertical" 7 tools:context=".ui.AddUpdateDetailsActivity"> 8 <TextView 9 android:id="@+id/tvHeading" 10 android:layout_width="wrap_content" 11 android:layout_height="wrap_content" 12 android:text="@string/strAddNewStudent" 13 android:layout_gravity="center" 14 android:gravity="center" 15 android:paddingTop="@dimen/_15sdp" 16 android:layout_marginBottom="@dimen/_10sdp" 17 android:textSize="30sp" 18 /> 19 <LinearLayout android:orientation="vertical" 20 android:paddingLeft="@dimen/_15sdp" 21 android:paddingRight="@dimen/_15sdp" 22 android:layout_height="wrap_content" android:layout_width="match_parent"> 23 <EditText 24 android:id="@+id/etName" 25 android:layout_width="match_parent" 26 android:layout_height="wrap_content" 27 android:ems="10" 28 android:inputType="textEmailAddress" 29 android:maxLines="1" 30 android:textSize="@dimen/_12sdp" 31 android:hint="@string/strStudentName" 32 android:layout_marginBottom="@dimen/_5sdp" 33 android:textColor="@color/mainText" 34 android:textColorHint="@color/subText" 35 android:paddingTop="@dimen/_10sdp" 36 android:paddingBottom="@dimen/_5sdp" 37 android:background="@android:color/transparent" /> 38 <View 39 android:layout_width="fill_parent" 40 android:layout_height="@dimen/_2sdp" 41 android:layout_marginBottom="@dimen/_5sdp" 42 android:background="@color/view"/> 43 44 <EditText 45 android:id="@+id/etStatus" 46 android:layout_width="match_parent" 47 android:layout_height="wrap_content" 48 android:ems="10" 49 android:inputType="textEmailAddress" 50 android:maxLines="1" 51 android:textSize="@dimen/_12sdp" 52 android:hint="@string/strStudentResult" 53 android:layout_marginBottom="@dimen/_5sdp" 54 android:textColor="@color/mainText" 55 android:textColorHint="@color/subText" 56 android:paddingTop="@dimen/_10sdp" 57 android:paddingBottom="@dimen/_5sdp" 58 android:background="@android:color/transparent" /> 59 <View 60 android:layout_width="fill_parent" 61 android:layout_height="@dimen/_2sdp" 62 android:layout_marginBottom="@dimen/_5sdp" 63 android:background="@color/view"/> 64 <EditText 65 android:id="@+id/etGrade" 66 android:layout_width="match_parent" 67 android:layout_height="wrap_content" 68 android:ems="10" 69 android:inputType="textEmailAddress" 70 android:maxLines="1" 71 android:textSize="@dimen/_12sdp" 72 android:hint="@string/strStudentGrade" 73 android:layout_marginBottom="@dimen/_5sdp" 74 android:textColor="@color/mainText" 75 android:textColorHint="@color/subText" 76 android:paddingTop="@dimen/_10sdp" 77 android:paddingBottom="@dimen/_5sdp" 78 android:background="@android:color/transparent" /> 79 <View 80 android:layout_width="fill_parent" 81 android:layout_height="@dimen/_2sdp" 82 android:layout_marginBottom="@dimen/_40sdp" 83 android:background="@color/view"/> 84 <Button 85 android:id="@+id/btnSave" 86 android:text="@string/strSave" 87 android:layout_gravity="center" 88 android:gravity="center" 89 android:background="@color/colorAccent" 90 android:textColor="@color/colorWhite" 91 android:layout_width="wrap_content"

92 android:padding="@dimen/_10sdp" 93 android:layout_height="wrap_content" /> 94 </LinearLayout> 95 </LinearLayout>

11. Now create the AddUpdateDetailsActivity.java le under ui package. Using this class we can perform Add / Update operations.

AddUpdateDetailsActivity.java

1 public class AddUpdateDetailsActivity extends AppCompatActivity implements View.OnClickListener { 2 3 // Primitive Variables 4 int strId; 5 String strName, strStatus, strGrade; 6 7 // DB Objects 8 public DBHelper db; 9 10 // Widget GUI Declare 11 TextView tvHeading; 12 EditText etName, etStatus, etGrade; 13 Button btnSave; 14 15 @Override 16 protected void onCreate(Bundle savedInstanceState) { 17 super.onCreate(savedInstanceState); 18 setContentView(R.layout.activity_add_update); 19 getSupportActionBar().setDisplayHomeAsUpEnabled(true); 20 getSupportActionBar().setDisplayShowHomeEnabled(true); 21 22 // Initialize Database Instance 23 db = new DBHelper(AddUpdateDetailsActivity.this); 24 etName = findViewById(R.id.etName); 25 etStatus = findViewById(R.id.etStatus); 26 etGrade = findViewById(R.id.etGrade); 27 tvHeading = findViewById(R.id.tvHeading); 28 btnSave = findViewById(R.id.btnSave); 29 30 // Set Title According To Operation 31 if (opration == 0) { 32 tvHeading.setText("Add Student Data"); 33 } else { 34 tvHeading.setText("Update Student Data"); 35 } 36 37 Intent intent = getIntent(); 38 if (intent != null) { 39 strId = intent.getIntExtra("sid", 0); 40 strName = intent.getStringExtra("sname"); 41 strStatus = intent.getStringExtra("sstatus"); 42 strGrade = intent.getStringExtra("sgrade"); 43 etName.setText(strName); 44 etStatus.setText(strStatus); 45 etGrade.setText(strGrade); 46 } 47 btnSave.setOnClickListener(this); 48 } 49 50 @Override 51 public boolean onSupportNavigateUp() { 52 onBackPressed(); 53 return true; 54 } 55 56 @Override 57 public void onClick(View v) { 58 if (v.getId() == R.id.btnSave) { 59 if (TextUtils.isEmpty(etName.getText())) { 60 Toast.makeText(this, "Name is empty..!", Toast.LENGTH_SHORT).show(); 61 } else if (TextUtils.isEmpty(etStatus.getText())) { 62 Toast.makeText(this, "Status is empty..!", Toast.LENGTH_SHORT).show(); 63 } else if (TextUtils.isEmpty(etGrade.getText())) { 64 Toast.makeText(this, "Grade is empty..!", Toast.LENGTH_SHORT).show(); 65 } else { 66 // get values from edittext 67 strName = etName.getText().toString(); 68 strStatus = etStatus.getText().toString(); 69 strGrade = etGrade.getText().toString(); 70 if (opration == 0) { 71 // Call insert method 72 addDetails(); 73 } else { 74 // Call update method 75 updateDetails(); 76 } 77 } 78 }

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}

// Call update method of SQLiteDatabase Class and close after private void updateDetails() { Intent intent = new Intent(); try { db.updateStudentDetails(new StudentInfo(strId, strName, strStatus, strGrade)); showRecords(); intent.putExtra("msg", "Details updated successfully..!"); setResult(1, intent); finish(); } catch (Exception e) { e.printStackTrace(); intent.putExtra("msg", "Update Failed..!"); setResult(0, intent); finish(); } } // Call insert method of SQLiteDatabase Class and close after public void addDetails() { Intent intent = new Intent(); try { db.addStudentDetails(new StudentInfo(strName, strStatus, strGrade)); showRecords(); intent.putExtra("msg", "Details added successfully..!"); setResult(1, intent); finish(); } catch (Exception e) { e.printStackTrace(); intent.putExtra("msg", "added failed..!"); setResult(0, intent); finish(); } }

// Reading all contacts public void showRecords() { Log.e("Reading ", "Reading all records.."); List<StudentInfo> studentInfos = db.getStudentDetails(); for (StudentInfo cn : studentInfos) { String log = "SId: " + cn.getStudentId() + " ,StudName: " + cn.getStudentName() + " StudStatus: " + cn.getStudentRes

}

}

+ " StudeGrade: " + cn.getStudentGrade(); // Writing records to log Log.e("Student: ", log);

6. Setup Main Activity 12. Finally open MainActivity.java and add following code into this. MainActivity will show you all the student records in form of list.

Using Floating Action Button you can add new student data in table.

Edit Button allows to edit perticular student data from the list.

By tapping Delete Button from the list you can delete particular student data.

MainActivity.java

1 public class MainActivity extends AppCompatActivity { 2 3 // Primitive Variables 4 public static int opration; 5 List<StudentInfo> mStudentInfoList; 6 7 // Widget GUI Declare 8 ListView lstView; 9 FloatingActionButton fab; 10 11 // DB Objects 12 DBHelper db; 13 14 // Adapter Object 15 StudentListAdapter adapter; 16 17 @Override 18 protected void onCreate(Bundle savedInstanceState) { 19 super.onCreate(savedInstanceState); 20 setContentView(R.layout.activity_main); 21 22 // Initialize Database Instance 23 db = new DBHelper(MainActivity.this); 24 25 // Widget GUI Init

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l s t Vi ew = f i ndVi ewBy I d( R. i d. l s t S t udent Det a i l s ) ; f a b = f i ndVi ewBy I d( R. i d. f a b) ;

/ / F et c h Da t a f r om da t a ba s e bi ndS t udent Da t a ( ) ; / / At t a c hed L i s t ener f a b. s et OnCl i c k L i s t ener ( new Vi ew. OnCl i c k L i s t ener ( ) { @Ov er r i de publ i c v oi d onCl i c k ( Vi ew v ) { I nt ent i nt ent = new I nt ent ( get Appl i c a t i onCont ex t ( ) , AddUpda t eDet a i l s Ac t i v i t y . c l a s s ) ; opr a t i on = 0; s t a r t Ac t i v i t y F or Res ul t ( i nt ent , 1) ; } }); }

/ / Get Al l S t udent Da t a F r om The Da t a ba s e publ i c v oi d bi ndS t udent Da t a ( ) { mS t udent I nf oL i s t = db. get S t udent Det a i l s ( ) ; a da pt er = new S t udent L i s t Ada pt er ( Ma i nAc t i v i t y . t hi s , R. l a y out . s t udent _l i s t _r ow, mS t udent I nf oL i s t ) ; l s t Vi ew. s et Ada pt er ( a da pt er ) ; l s t Vi ew. s et E mpt y Vi ew( f i ndVi ewBy I d( R. i d. empt y ) ) ; } @Ov er r i de publ i c bool ea n onCr ea t eOpt i ons Menu( Menu menu) { MenuI nf l a t er i nf l a t er = get MenuI nf l a t er ( ) ; i nf l a t er . i nf l a t e( R. menu. menu, menu) ; r et ur n t r ue ; } @Ov er r i de publ i c bool ea n onOpt i ons I t emS el ec t ed( MenuI t em i t em) { s wi t c h ( i t em. get I t emI d( ) ) { c a s e R. i d. a ddDet a i l s : / / Ca l l f or a dd da t a I nt ent i nt ent = new I nt ent ( get Appl i c a t i onCont ex t ( ) , AddUpda t eDet a i l s Ac t i v i t y . c l a s s ) ; opr a t i on = 0; s t a r t Ac t i v i t y F or Res ul t ( i nt ent , 1) ; r et ur n t r ue ; } r et ur n s uper . onOpt i ons I t emS el ec t ed( i t em) ; } @Ov er r i de pr ot ec t ed v oi d onAc t i v i t y Res ul t ( i nt r eques t Code, i nt r es ul t Code , I nt ent da t a ) { s uper . onAc t i v i t y Res ul t ( r eques t Code, r es ul t Code , da t a ) ; try { i f ( r eques t Code == r es ul t Code ) { r ef er s hL a y out ( ) ; T oa s t . ma k eT ex t ( get Appl i c a t i onCont ex t ( ) , " Res ul t s uc c es s : " + da t a . get S t r i ngE x t r a ( " ms g" ) , T oa s t . L E NGT H_S HO } el s e { S t r i ng s t r = da t a . get S t r i ngE x t r a ( " ms g" ) ; i f ( T ex t Ut i l s . i s E mpt y ( s t r ) ) { T oa s t . ma k eT ex t ( get Appl i c a t i onCont ex t ( ) , " empt y " , T oa s t . L E NGT H_S HORT) . s how( ) ; } el s e { L og. e( " E r r or " , s t r ) ; T oa s t . ma k eT ex t ( get Appl i c a t i onCont ex t ( ) , " E r r or : " + da t a . get S t r i ngE x t r a ( " ms g" ) , T oa s t . L E NGT H_S HORT } } } c a t c h ( E x c ept i on e) { e. pr i nt S t a c k T r a c e ( ) ; } } publ i c v oi d r ef er s hL a y out ( ) { i f ( Bui l d. VE RS I ON. S DK_I NT >= 16) { t hi s . r ec r ea t e ( ) ; } el s e { f i na l I nt ent i nt ent = get I nt ent ( ) ; i nt ent . a ddF l a gs ( I nt ent . F L AG_ACT I VI T Y_NO_ANI MAT I ON) ; t hi s . f i ni s h( ) ; t hi s . ov er r i dePendi ngT r a ns i t i on( 0, 0) ; t hi s . s t a r t Ac t i v i t y( i nt ent ) ; t hi s . ov er r i dePendi ngT r a ns i t i on( 0, 0) ; } }

I hope you like this article. If you have followed this tutorial carefully then application run without any is s ue. Write us if there is any is s ue to implement SQLite Databas e In Android.

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