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更新的版本我的問題現在是事實我的登錄按鈕不會做任何事情時，我按它，也我想我的登錄屏幕來驗證帳戶是否創建在我註冊活動並訪問其信息和處理，以我的主類登錄屏幕問題和數據驗證
我的登錄屏幕
public class LoginScreen extends Activity {
private Button btnLogin;
private TextView registerScreen;
private LoginDataBaseAdapter dataBaseAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setting default screen to login.xml
setContentView(R.layout.login);
registerScreen = (TextView) this.findViewById(R.id.link_to_register);
btnLogin = (Button) findViewById(R.id.btnLogin);
// create a instance of SQLite Database
dataBaseAdapter = new LoginDataBaseAdapter(this);
dataBaseAdapter.open();
final Dialog dialog = new Dialog(LoginScreen.this);
dialog.setContentView(R.layout.login);
dialog.setTitle("Login");
// get the References of views
final EditText loginUsername = (EditText) dialog
.findViewById(R.id.liUsername);
final EditText loginPassword = (EditText) dialog
.findViewById(R.id.liPassword);
btnLogin.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String username = loginUsername.getText().toString();
String password = loginPassword.getText().toString();
login(username, password);
}
private void login(String username, String password) {
// fetch the Password form database for respective user name
String storedPassword = dataBaseAdapter
.getSingleEntry(username);
// check if the Stored password matches with Password entered by
// user
if (password.equals(storedPassword)) {
Toast.makeText(LoginScreen.this,
"Congrats: Login Successful", Toast.LENGTH_LONG)
.show();
dialog.dismiss();
Intent i = new Intent(LoginScreen.this, MainPage.class);
startActivity(i);
} else {
Toast.makeText(LoginScreen.this,
"User Name or Password does not match",
Toast.LENGTH_LONG).show();
}
// TODO Auto-generated method stub
}
});
registerScreen.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
// This called whenever btnlogin is clicked:
startActivity(new Intent(LoginScreen.this, SignUp.class));
}
});
}
@Override
protected void onDestroy() {
try {
super.onDestroy();
dataBaseAdapter.close();
} catch (Exception e) {
Log.e("onDestroy - Error", e.getMessage());
}
}
}
和我的註冊類櫃面你想看到它
public class SignUp extends Activity {
private EditText reg_fullname, reg_username, reg_email, reg_password ;
private Button btnRegister;
private LoginDataBaseAdapter dataBaseAdapter;
private TextView loginScreen;
protected DataBaseHelper DB = new DataBaseHelper(SignUp.this);
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
// Set View to register.xml
setContentView(R.layout.signup);
reg_fullname = (EditText) findViewById(R.id.reg_fullname);
reg_username = (EditText) findViewById(R.id.reg_username);
reg_email = (EditText) findViewById(R.id.reg_email);
reg_password = (EditText) findViewById(R.id.reg_password);
loginScreen = (TextView) this.findViewById(R.id.link_to_login);
//Listening to Login Screen Link
btnRegister = (Button) findViewById(R.id.btnRegister);
// get Instance of Database Adapter
dataBaseAdapter = new LoginDataBaseAdapter(this);
dataBaseAdapter.open();
loginScreen.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.link_to_login:
startActivity(new Intent(SignUp.this, LoginScreen.class));
finish();
break;
}
}
});
btnRegister.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()){
case R.id.btnRegister:
// I think they have to be final to be used in the onClickListener
final String fullname = reg_fullname.getText().toString();
final String username = reg_username.getText().toString();
final String password = reg_password.getText().toString();
final String email = reg_email.getText().toString();
boolean invalid = false;
if(fullname.equals(""))
{
invalid = true;
Toast.makeText(getApplicationContext(), "Enter your Firstname", Toast.LENGTH_SHORT).show();
}
else
if(username.equals(""))
{
invalid = true;
Toast.makeText(getApplicationContext(), "Please enter your Username", Toast.LENGTH_SHORT).show();
}
else
if(password.equals(""))
{
invalid = true;
Toast.makeText(getApplicationContext(), "Please enter your Password", Toast.LENGTH_SHORT).show();
}
else
if(email.equals(""))
{
invalid = true;
Toast.makeText(getApplicationContext(), "Please enter your Email ID", Toast.LENGTH_SHORT).show();
}
else
{
// btnLogin.setVisibility(View.GONE);
Toast.makeText(getApplicationContext(), "Account Successfully Created ", Toast.LENGTH_LONG).show();
Log.d("FULLNAME", fullname);
Log.d("PASSWORD",password);
Log.d("USERNAME",username);
Log.d("EMAIL",email);
Intent i=new Intent(SignUp.this,MainPage.class);
startActivity(i);
// Save the Data in Database
dataBaseAdapter.insertEntry(fullname, username,password,email);
}break;
}
}
});
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
try{
super.onDestroy();
dataBaseAdapter.close();
}catch(Exception e){
Log.e("onDestroy SignUp- Error", e.getMessage());
}
}
private void addEntry(String fullname, String username, String password, String email)
{
SQLiteDatabase db = DB.getWritableDatabase();
ContentValues values = new ContentValues();
values.put("FULLNAME", fullname);
values.put("USERNAME", username);
values.put("PASSWORD", password);
values.put("EMAIL", email);
try
{
db.insert(DataBaseHelper.DATABASE_TABLE_NAME, null, values);
Toast.makeText(getApplicationContext(), "your details submitted Successfully...", Toast.LENGTH_SHORT).show();
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
在登錄（視圖V）在你的XML你的onClick或它是如何被調用？ – Zach 2014-08-27 16:36:14
可能與[登錄/註冊問題]重複（http://stackoverflow.com/questions/25252645/issues-with-login-regstration） – BrainCrash 2014-08-28 01:46:05
檢查：http://techblogon.com/android-login-registration-screen -with-sqlite-database-example/ – 2014-08-28 04:24:58