public class AuthenticationActivity extends AppCompatActivity {
private EditText edtMobile,edtPassword;
private Button btnLogin;
private Button btnSignup;
DatabaseHelper databaseHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_authentication);
databaseHelper = new DatabaseHelper(this);
edtMobile = (EditText) findViewById(R.id.edt_mobile);
edtPassword = (EditText) findViewById(R.id.edt_password);
btnLogin = (Button) findViewById(R.id.btn_login);
btnSignup = (Button) findViewById(R.id.btn_signup);
btnLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String authenticationActivtyMobile = edtMobile.getText().toString();
String authenticationActivtyPassword = edtPassword.getText().toString();
//Mobile
if(authenticationActivtyMobile.length() == 10){
}else{
Toast.makeText(AuthenticationActivity.this, "Enter Only 10 Digit Number", Toast.LENGTH_SHORT).show();
return;
}
String phone = String.valueOf(authenticationActivtyMobile);
char c = phone.charAt(0);
if (c == '8' || c == '9' ||c =='7'){
}else if( c == '0' ||c == '1' ||c == '2' ||c == '3' ||c == '4' ||c == '5' ||c == '6')
{
Toast.makeText(AuthenticationActivity.this, "Number Must Begin with 9 8 7",Toast.LENGTH_SHORT).show();
return;
}
//Password
if(authenticationActivtyPassword.length() <4){
Toast.makeText(AuthenticationActivity.this, "Password Must Have Minimum 4 Character", Toast.LENGTH_SHORT).show();
return;
}else if(authenticationActivtyPassword.length()>=15){
Toast.makeText(AuthenticationActivity.this, "Password Can Have Maximum 8 Character", Toast.LENGTH_SHORT).show();
return;
}
String password = databaseHelper.search(authenticationActivtyMobile,authenticationActivtyPassword);
if (authenticationActivtyPassword.equals(password) && authenticationActivtyMobile.equals(password) ) {
Toast.makeText(AuthenticationActivity.this, "LOGIN SUCCESS", Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(AuthenticationActivity.this, "LOGIN FAILED", Toast.LENGTH_SHORT).show();
}
}
});
btnSignup.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(AuthenticationActivity.this, "Opening MainActivity Page", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(AuthenticationActivity.this, MainActivity.class);
startActivity(intent);
}
});
}
DatabaseHelper.java
public class DatabaseHelper extends SQLiteOpenHelper {
public static String dataBaseName = "Login.db";
private static final int dataBaseVersion = 1;
private static final String tableName = "Accounts";
private static String Key_Id = "id";
private static String Key_FirstName = "firstname";
private static String Key_LastName = "lastname";
private static String Key_Password = "password";
private static String Key_Mobile = "mobile";
private static String Key_Email = "email";
public static String tag = "tag";
private static final String createTableAccounts = "CREATE TABLE " + tableName + "( " + Key_Id + " INTEGER PRIMARY KEY AUTOINCREMENT, " + Key_FirstName + " TEXT, " + Key_LastName + " TEXT, " + Key_Password + " TEXT, " + Key_Mobile + " TEXT, " + Key_Email + " TEXT );";
public DatabaseHelper(Context context) {
super(context, dataBaseName, null, dataBaseVersion);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(createTableAccounts);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS" + createTableAccounts);
onCreate(db);
}
public long addAccountDetials(AccountsModel accounts) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(Key_FirstName, accounts.firstname);
values.put(Key_LastName, accounts.lastname);
values.put(Key_Password, accounts.password);
values.put(Key_Mobile, accounts.mobile);
values.put(Key_Email, accounts.email);
long insert = db.insert(tableName, null, values);
return insert;
}
public int updateEntry(AccountsModel accounts) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(Key_FirstName, accounts.firstname);
values.put(Key_LastName, accounts.lastname);
values.put(Key_Password, accounts.password);
values.put(Key_Mobile, accounts.mobile);
values.put(Key_Email, accounts.email);
return db.update(tableName, values, Key_Id + "=?", new String[]{String.valueOf(accounts.id)});
}
public void deleteEntry(long id) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(tableName, Key_Id + " = ?", new String[]{String.valueOf(id)});
}
public String search(String mobile,String password) {
SQLiteDatabase db = this.getReadableDatabase();
String query = "Select * FROM Accounts WHERE mobile='"+mobile+"'and password='"+password+"'";
Cursor cursor = db.rawQuery(query, null);
String a,b;
b = "not found";
if (cursor.moveToFirst()) {
do {
a = cursor.getString(3);
if (a.equals(mobile)) {
b = cursor.getString(4);
break;
}
}
while (cursor.moveToFirst());
}
return b;
}}
MainActivity.java
public class MainActivity extends Activity implements OnClickListener{
private String firstName;
private String lastName;
private String mobile;
private String password;
private String email;
private EditText edtSignupFirstName;
private EditText edtSignupLastName;
private EditText edtSignupMobile;
private EditText edtSignupPassword;
private EditText edtSignupEmail;
private EditText edtId;
private Button btnSignupRegister;
private Button btnDelete;
DatabaseHelper db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
db = new DatabaseHelper(getApplicationContext());
edtSignupFirstName=(EditText)findViewById(R.id.edt_signup_first_name);
edtSignupLastName=(EditText)findViewById(R.id.edt_signup_last_name);
edtSignupMobile=(EditText)findViewById(R.id.edt_signup_mobile);
edtSignupPassword=(EditText)findViewById(R.id.edt_signup_password);
edtSignupEmail=(EditText)findViewById(R.id.edt_signup_email);
edtId=(EditText)findViewById(R.id.edt_id);
btnSignupRegister=(Button)findViewById(R.id.btn_signup_register);
btnDelete=(Button)findViewById(R.id.btn_delete);
btnSignupRegister.setOnClickListener(this);
btnDelete.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v==findViewById(R.id.btn_signup_register))
{
AccountsModel accounts=new AccountsModel();
accounts.firstname=edtSignupFirstName.getText().toString();
accounts.lastname=edtSignupLastName.getText().toString();
accounts.password=edtSignupPassword.getText().toString();
accounts.mobile=edtSignupMobile.getText().toString();
accounts.email=edtSignupEmail.getText().toString();
db.addAccountDetials(accounts);
Toast.makeText(MainActivity.this, "DB ADDED", Toast.LENGTH_SHORT).show();
}
if (v==findViewById(R.id.btn_delete))
{
String account_id=edtId.getText().toString();
db.deleteEntry(Integer.parseInt(account_id));
Toast.makeText(MainActivity.this, "DB DELETED", Toast.LENGTH_SHORT).show();
}
}
}
这里通过点击注册按钮，它意图进入主要活动，我的详细信息将被输入。然后单击注册按钮，详细信息将存储在db。
中在这里，当我点击“登录”按钮时，它与数据库匹配并获取Toast消息＆＃34;登录失败＆＃34;。我该怎么做才能获得正确的祝酒消息？
答案 0 :(得分：0)
它匹配db并获取toast消息“Login Failed”
因为：
if (authenticationActivtyPassword.equals(password) &&
authenticationActivtyMobile.equals(password) ) {
///..
}
if条件
目前检查authenticationActivtyPassword和authenticationActivtyMobile两者都等于password，这会使条件始终为假。
并在search方法中，使用mobile和password从数据库中获取数据，因此您可以将条件更改为：
if (authenticationActivtyPassword.equals(password)) {
///.. login success
}else{
//login failed
}
答案 1 :(得分：0)
authenticationActivtyMobile.equals(password) --that is never going to be true.
相反，您可以从搜索功能返回一个布尔值，只需检查它是否为真：
public boolean search(String mobile,String password) {
boolean isLogin = false;
SQLiteDatabase db = this.getReadableDatabase();
String query = "Select * FROM Accounts WHERE mobile='"+mobile+"'and password='"+password+"'";
Cursor cursor = db.rawQuery(query, null);
String a,b;
b = "not found";
if (cursor.moveToFirst()) {
do {
a = cursor.getString(3);
if (a.equals(mobile)) {
b = cursor.getString(4);
break;
}
}
while (cursor.moveToFirst());
}
if(!b.equals("not found")) isLogin = true;
return isLogin;
}}
然后：
boolean isLogin = databaseHelper.search(authenticationActivtyMobile,authenticationActivtyPassword);
if (isLogin) {
Toast.makeText(AuthenticationActivity.this, "LOGIN SUCCESS", Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(AuthenticationActivity.this, "LOGIN FAILED", Toast.LENGTH_SHORT).show();
}