Wie kann ich meinen Rebanta Madlab Endem Code besser machen? ⇐ Java

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Anonymous
 Wie kann ich meinen Rebanta Madlab Endem Code besser machen?

Post by Anonymous »

https://limewire.com/d/zexzz#brldvoe9mn
Nur ein Code meines Madlab Endem. Verwenden Sie gerne
eine Android -App von Student Management mit SQLite. Meiner Ansichtsaktivität zeige ich alle Schülerdatensätze mit einem Recyclerview an. Ich möchte eine Such-/Filterfunktion hinzufügen, damit Benutzer Schüler leicht mit Namen oder Rollnummer finden können. Bearbeiten Sie zur Anzeige der Sucheingabe und legen Sie einen Textwechantener fest. Ich bin mir jedoch nicht sicher, wie ich die Liste filtern und die Recyclerview entsprechend aktualisieren soll. < /P>

Code: Select all

endsem2

MainActivity.java

package com.example.endsem2;

import android.app.DatePickerDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.*;
import androidx.appcompat.app.AppCompatActivity;

import java.util.Calendar;

public class MainActivity extends AppCompatActivity {

EditText etName, etAge;
RadioButton rbMale, rbFemale, rbothers;
CheckBox cbDance, cbMusic, cbGaming;
Spinner spBranch;
Button btnSave, btnView, btnPickDate;
SeekBar seekSkill;
TextView tvSkillValue, tvDate;
DBHelper dbHelper;
String selectedDate = "";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

etName = findViewById(R.id.etName);
etAge = findViewById(R.id.etAge);
rbMale = findViewById(R.id.rbMale);
rbFemale = findViewById(R.id.rbFemale);
rbothers = findViewById(R.id.rbothers);
cbDance = findViewById(R.id.cbDance);
cbGaming = findViewById(R.id.cbGaming);
cbMusic = findViewById(R.id.cbMusic);
spBranch = findViewById(R.id.spBranch);
btnSave = findViewById(R.id.btnSave);
btnView = findViewById(R.id.btnView);
btnPickDate = findViewById(R.id.btnPickDate);
tvDate = findViewById(R.id.tvDate);
seekSkill = findViewById(R.id.seekSkill);
tvSkillValue = findViewById(R.id.tvSkillValue);

dbHelper = new DBHelper(this);

seekSkill.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
tvSkillValue.setText("Selected: " + progress);
}

@Override
public void onStartTrackingTouch(SeekBar seekBar) {}

@Override
public void onStopTrackingTouch(SeekBar seekBar) {}
});

btnPickDate.setOnClickListener(v -> {
Calendar calendar = Calendar.getInstance();
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH);
int day = calendar.get(Calendar.DAY_OF_MONTH);

DatePickerDialog datePickerDialog = new DatePickerDialog(MainActivity.this,
(view, year1, month1, dayOfMonth) -> {
selectedDate = dayOfMonth + "/" + (month1 + 1) + "/" + year1;
tvDate.setText("Selected: " + selectedDate);
}, year, month, day);
datePickerDialog.show();
});

btnSave.setOnClickListener(view -> {
String name = etName.getText().toString().trim();
String ageStr = etAge.getText().toString().trim();
if (name.isEmpty() || ageStr.isEmpty()) {
Toast.makeText(MainActivity.this, "Data not entered", Toast.LENGTH_SHORT).show();
return;
}

int age = Integer.parseInt(ageStr);
String gender = rbMale.isChecked() ? "Male" : rbFemale.isChecked() ? "Female" : rbothers.isChecked() ? "Others" : "Not Specified";
StringBuilder hobbies = new StringBuilder();
if (cbDance.isChecked()) hobbies.append("Dance ");
if (cbMusic.isChecked()) hobbies.append("Music ");
if (cbGaming.isChecked()) hobbies.append("Gaming");
String branch = spBranch.getSelectedItem().toString();
int skill = seekSkill.getProgress();

boolean inserted = dbHelper.insertStudent(name, gender, hobbies.toString().trim(), branch, age, selectedDate, skill);
if (inserted)
Toast.makeText(MainActivity.this, "Data saved successfully", Toast.LENGTH_SHORT).show();
else
Toast.makeText(MainActivity.this, "Error saving data", Toast.LENGTH_SHORT).show();
});

btnView.setOnClickListener(v ->  {
startActivity(new Intent(MainActivity.this, ViewActivity.class));
});
}
}

DBHelper.java

package com.example.endsem2;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.content.ContentValues;
import android.database.Cursor;

public class DBHelper extends SQLiteOpenHelper {
public static final String DB_NAME = "StudentDB";
public static final int DB_VERSION = 3;

public DBHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION);
}

@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE student (id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, gender TEXT, hobbies TEXT, branch TEXT, age INTEGER, dob TEXT, skill INTEGER)");
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS student");
onCreate(db);
}

public boolean insertStudent(String name, String gender, String hobbies, String branch, int age, String dob, int skill) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put("name", name);
cv.put("gender", gender);
cv.put("hobbies", hobbies);
cv.put("branch", branch);
cv.put("age", age);
cv.put("dob", dob);
cv.put("skill", skill);
long result = db.insert("student", null, cv);
return result != -1;
}

public void deleteStudent(int studentId) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete("student", "id = ?", new String[]{String.valueOf(studentId)});
}

public void updateStudent(int studentId, String newName) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues cv = new ContentValues();
cv.put("name", newName);
db.update("student", cv, "id = ?", new String[]{String.valueOf(studentId)});
}

public Cursor getAllStudents() {
SQLiteDatabase db = this.getReadableDatabase();
return db.rawQuery("SELECT * FROM student", null);
}
}

ViewActivity.java

package com.example.endsem2;

import android.app.AlertDialog;
import android.database.Cursor;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.MenuItem;
import android.view.View;
import android.widget.*;
import androidx.appcompat.app.AppCompatActivity;

import java.util.ArrayList;

public class ViewActivity extends AppCompatActivity {

GridView gridView;
ArrayAdapter adapter;
ArrayList studentList = new ArrayList();
DBHelper dbHelper;
int selectedItemIndex = -1;
ArrayList studentIds = new ArrayList();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view);

gridView = findViewById(R.id.gridView);
dbHelper = new DBHelper(this);

loadStudents();

registerForContextMenu(gridView);

gridView.setOnItemLongClickListener((adapterView, view, i, l) -> {
selectedItemIndex = i;
return false;
});
}

void loadStudents() {
studentList.clear();
studentIds.clear();
Cursor cursor = dbHelper.getAllStudents();
while (cursor.moveToNext()) {
int id = cursor.getInt(0);
studentIds.add(id);
String student = "ID: " + id +
"\nName: " + cursor.getString(1) +
"\nGender: " + cursor.getString(2) +
"\nHobbies: " + cursor.getString(3) +
"\nBranch: " + cursor.getString(4) +
"\nAge: " + cursor.getInt(5) +
"\nDOB: " + cursor.getString(6) +
"\nSkill: "  + cursor.getInt(7);
studentList.add(student);
}
adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, studentList);
gridView.setAdapter(adapter);
}

@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
getMenuInflater().inflate(R.menu.context_menu, menu);
}

@Override
public boolean onContextItemSelected(MenuItem item) {
if (selectedItemIndex == -1) return false;

int studentId = studentIds.get(selectedItemIndex);

if (item.getItemId() == R.id.menu_view) {
Toast.makeText(this, studentList.get(selectedItemIndex), Toast.LENGTH_SHORT).show();
return true;
} else if (item.getItemId() == R.id.menu_edit) {
showEditDialog(studentId);
return true;
} else if (item.getItemId() == R.id.menu_delete) {
showDeleteConfirmation(studentId);
return true;
}

return super.onContextItemSelected(item);
}

void showEditDialog(int studentId) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Edit Student Name");

final EditText input = new EditText(this);
input.setHint("Enter new name");
builder.setView(input);

builder.setPositiveButton("Update", (dialog, which) -> {
String newName = input.getText().toString().trim();
if (!newName.isEmpty()) {
dbHelper.updateStudent(studentId, newName);
Toast.makeText(ViewActivity.this, "Name updated", Toast.LENGTH_SHORT).show();
loadStudents();
}
});

builder.setNegativeButton("Cancel", null);
builder.show();
}

void showDeleteConfirmation(int studentId) {
new AlertDialog.Builder(this)
.setTitle("Confirm Delete")
.setMessage("Are you sure you want to delete this student?")
.setPositiveButton("Yes", (dialog, which) -> {
dbHelper.deleteStudent(studentId);
Toast.makeText(ViewActivity.this, "Student deleted", Toast.LENGTH_SHORT).show();
loadStudents();
})
.setNegativeButton("No", null)
.show();
}
}

LoginActivity.java

package com.example.endsem2;

import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.widget.*;
import androidx.appcompat.app.AppCompatActivity;

public class LoginActivity extends AppCompatActivity {

EditText etEmail, etPassword;
Button btnLogin;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);

etEmail = findViewById(R.id.etEmail);
etPassword = findViewById(R.id.etPassword);
btnLogin = findViewById(R.id.btnLogin);

btnLogin.setOnClickListener(v -> {
String email = etEmail.getText().toString().trim();
String password = etPassword.getText().toString().trim();

if (TextUtils.isEmpty(email) || TextUtils.isEmpty(password)) {
Toast.makeText(LoginActivity.this, "Enter email and password", Toast.LENGTH_SHORT).show();
} else {
// You can replace this with real authentication
if (email.equals("admin@example.com") && password.equals("123456")) {
startActivity(new Intent(LoginActivity.this, MainActivity.class));
finish();
} else {
Toast.makeText(LoginActivity.this, "Invalid credentials", Toast.LENGTH_SHORT).show();
}
}
});
}
}

activity_main.xml

















































activity_view.xml







activity_login.xml











context_menu.xml (in menu)







strings.xml


endsem2

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