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- public class DbHelper extends SQLiteOpenHelper {
- public static final String TAG = DbHelper.class.getSimpleName();
- public static final String DB_NAME = "myapp.db";
- public static final int DB_VERSION = 1;
- public static final String USER_TABLE = "users";
- public static final String COLUMN_ID = "_id";
- public static final String COLUMN_usurarios = "usurarios";
- public static final String COLUMN_PASS = "password";
- public static final String COLUMN_ESTADO = "estado";
- /*
- create table users(
- id integer primary key autoincrement,
- usurarios text,
- password text);
- */
- public static final String CREATE_TABLE_USERS = "CREATE TABLE " + USER_TABLE + "("
- + COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT,"
- + COLUMN_usurarios + " TEXT,"
- + COLUMN_PASS + " TEXT"
- + COLUMN_ESTADO + " TEXT)";
- public DbHelper(Context applicationContext, Object o, SQLiteDatabase.CursorFactory factory, int i) {
- super(applicationContext, DB_NAME,factory , DB_VERSION);
- }
- @Override
- public void onCreate(SQLiteDatabase db) {
- db.execSQL(CREATE_TABLE_USERS);
- }
- @Override
- public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
- db.execSQL("DROP TABLE IF EXISTS " + USER_TABLE);
- onCreate(db);
- }
- /**
- * Storing user details in database
- * */
- public void addUser(String usurarios, String password) {
- SQLiteDatabase db = this.getWritableDatabase();
- ContentValues values = new ContentValues();
- values.put(COLUMN_usurarios, usurarios);
- values.put(COLUMN_PASS, password);
- long id = db.insert(USER_TABLE, null, values);
- db.close();
- Log.d(TAG, "Usuario insertado" + id);
- }
- public boolean getUser(String usurarios, String pass){
- //HashMap<String, String> user = new HashMap<String, String>();
- String selectQuery = "select * from " + USER_TABLE + " where " +
- COLUMN_usurarios + " = " + "'"+usurarios+"'" + " and " + COLUMN_PASS + " = " + "'"+pass+"'";
- SQLiteDatabase db = this.getReadableDatabase();
- Cursor cursor = db.rawQuery(selectQuery, null);
- // Move to first row
- cursor.moveToFirst();
- if (cursor.getCount() > 0) {
- return true;
- }
- cursor.close();
- db.close();
- return false;
- }
- public String eliminar(String usuarios){
- String mensaje="";
- SQLiteDatabase db= this.getWritableDatabase();
- int cantidad = db.delete(USER_TABLE ,COLUMN_usurarios+"=?",new String[]{usuarios});
- if(cantidad!=0){
- mensaje="eliminado correctamente";
- }else{
- mensaje="No existe";
- }
- db.close();
- return mensaje;
- }
- public List<Map<String, String>> llenar_lv(){
- ArrayList<String> lista = new ArrayList<>();
- SQLiteDatabase db = this.getWritableDatabase();
- String q = "SELECT * FROM users";
- Cursor registros = db.rawQuery(q,null);
- registros.moveToFirst();
- List<Map<String, String>> data = new ArrayList<Map<String, String>>();
- while(registros.moveToNext()){
- Map<String, String> datum = new HashMap<String, String>(2);
- datum.put("datos1", registros.getString(1));
- datum.put("datos2", registros.getString(3));
- data.add(datum);
- }
- return data;
- }
- public String actualizar(String nombre,String contraseña){
- String Mensaje ="";
- SQLiteDatabase db = this.getWritableDatabase();
- ContentValues contenedor = new ContentValues();
- contenedor.put("password",contraseña);
- int cantidad = db.update(USER_TABLE, contenedor, COLUMN_usurarios+"='"+nombre+"'",null);
- if(cantidad!=0){
- Mensaje="Actualizado Correctamente";
- }else{
- Mensaje="No Actualizado";
- }
- db.close();
- return Mensaje;
- }
- public class RegisterActivity extends AppCompatActivity implements View.OnClickListener{
- private Button reg,eliminar,button3;
- private TextView tvLogin;
- private EditText etuser, etPass;
- private DbHelper db;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_register);
- db = new DbHelper(getApplicationContext(),null, null, 1);
- reg = (Button)findViewById(R.id.btnReg);
- eliminar=(Button)findViewById(R.id.button);
- tvLogin = (TextView)findViewById(R.id.tvLogin);
- etuser = (EditText)findViewById(R.id.etuser);
- etPass = (EditText)findViewById(R.id.etPass);
- button3=(Button)findViewById(R.id.button3);
- reg.setOnClickListener(this);
- tvLogin.setOnClickListener(this);
- eliminar.setOnClickListener(new View.OnClickListener(){
- @Override
- public void onClick(View v){
- DbHelper db = new DbHelper(getApplicationContext(),null,null,1);
- String usuarios = etuser.getText().toString();
- String mensaje = db.eliminar(usuarios);
- Toast.makeText(getApplicationContext(),mensaje,Toast.LENGTH_SHORT).show();
- }
- });
- button3.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View v) {
- DbHelper db = new DbHelper(getApplicationContext(),null,null,1);
- String nombre = etuser.getText().toString();
- String contraseña = etPass.getText().toString();
- String Mensaje =db.actualizar(nombre,contraseña);
- Toast.makeText(getApplicationContext(),Mensaje,Toast.LENGTH_SHORT).show();
- }
- });
- }
- @Override
- public void onClick(View v) {
- switch(v.getId()){
- case R.id.btnReg:
- register();
- break;
- case R.id.tvLogin:
- startActivity(new Intent(RegisterActivity.this,LoginActivity.class));
- finish();
- break;
- default:
- }
- }
- private void register(){
- String user = etuser.getText().toString();
- String pass = etPass.getText().toString();
- if(user.isEmpty() && pass.isEmpty()){
- displayToast("Usuario o contraseña vacio");
- }
- else if (pass.isEmpty()){
- db.addUser(user,"1234");
- displayToast("Usuario registrado con exito!n" +
- "contraseña por defecto:1234");
- finish();
- }
- else{
- db.addUser(user,pass);
- displayToast("Usuario registrado con exito!");
- finish();
- }
- }
- private void displayToast(String message){
- Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();
- }
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