我已经提到了许多答案，但是当我的应用程序首次打开时，我的应用程序仍未显示注册屏幕。我已经使用了共享的首选项。任何帮助将不胜感激。谢谢！
MainActivity.java：
public class MainActivity extends AppCompatActivity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String name;
SharedPreferences prefs = this.getSharedPreferences( "prefs", MODE_PRIVATE);
boolean firstStart=prefs.getBoolean("firstStart",true);
if (firstStart) {
//show start activity
showRegistration();
}
}
private void showRegistration() {
SharedPreferences prefs=getSharedPreferences("prefs",MODE_PRIVATE);
SharedPreferences.Editor editor=prefs.edit();
editor.putBoolean("firstStart",false);
editor.apply();
Intent intent =new Intent(MainActivity.this,RegisterActivity.class);
}
}
RegistrationActivity.java：
public class RegisterActivity extends AppCompatActivity implements View.OnClickListener{
private static final String TAG = "Main Activity";
Firebase mRootRef;
FirebaseAuth mAuth;
EditText mname;
Button mlogin;
Button msignin;
Button mregister;
EditText memail;
EditText maddress;
EditText mconfirmpassword; EditText mpwd;
private void updateUI(FirebaseUser user){
if (user !=null){
Toast.makeText(RegisterActivity.this,"Registration successful",Toast.LENGTH_SHORT).show();
startActivity(new Intent(RegisterActivity.this, MainActivity.class));
} }
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_register);
mRootRef=new Firebase("https://goorgano-8bdfe.firebaseio.com/Users");
msignin=(Button)findViewById(R.id.sign_in_admin);
mAuth = FirebaseAuth.getInstance();
mname=(EditText)findViewById(R.id.username);
mlogin=(Button)findViewById(R.id.login);
memail=(EditText)findViewById(R.id.email);
maddress=(EditText)findViewById(R.id.address);
mconfirmpassword=(EditText)findViewById(R.id.confirmpassword);
mpwd= (EditText)findViewById(R.id.password);
mregister=(Button)findViewById(R.id.register);
mlogin.setOnClickListener(this);
msignin.setOnClickListener(this);
mregister.setOnClickListener(this);
}
public void onClick(View v)
{
int i=v.getId();
if(i==R.id.sign_in_admin)
{
}
else if(i==R.id.login)
{
startActivity(new Intent(RegisterActivity.this,LoginActivity.class));
}
else if(i==R.id.register)
{
createAccount();
startActivity(new Intent(RegisterActivity.this,LoginActivity.class));
}
}
private void createAccount()
{
Log.e(TAG, "createAccount:" + memail.getText().toString());
if (!validateForm(memail.getText().toString(),mpwd.getText().toString(),maddress.getText().toString(),mname.getText().toString()))
{
return;
}
String value=mname.getText().toString();
String key="name";
Firebase childref=mRootRef.child(value);Firebase c=childref;
childref.setValue(value);
value=memail.getText().toString();
String email=value;
key="email";
childref=childref.child(key);
childref.setValue(value);
value=maddress.getText().toString();
String pwd=mpwd.getText().toString();
key="address";
childref=c.child(key);
childref.setValue(value);
mAuth.createUserWithEmailAndPassword(email,pwd)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>()
{
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()) {
Log.e(TAG, "createAccount: Success!");
// update UI with the signed-in user's information
FirebaseUser user = mAuth.getCurrentUser();
updateUI(user);
} else {
Log.e(TAG, "createAccount: Fail!", task.getException());
Toast.makeText(getApplicationContext(), "Authentication failed!", Toast.LENGTH_SHORT).show();
updateUI(null);
}
}
});
}
private boolean validateForm(String email, String password, String address, String username)
{
if (TextUtils.isEmpty(email))
{
Toast.makeText(getApplicationContext(), "Enter email address!", Toast.LENGTH_SHORT).show();
return false;
}
if(!Patterns.EMAIL_ADDRESS.matcher(email).matches())
{
Toast.makeText(getApplicationContext(), "Enter valid email address!", Toast.LENGTH_SHORT).show();
return false;
}
if (TextUtils.isEmpty(password))
{
Toast.makeText(getApplicationContext(), "Enter password!", Toast.LENGTH_SHORT).show();
return false;
}
if (TextUtils.isEmpty(username))
{
Toast.makeText(getApplicationContext(), "Enter username!", Toast.LENGTH_SHORT).show();
return false;
}
if (TextUtils.isEmpty(address))
{
Toast.makeText(getApplicationContext(), "Enter address!", Toast.LENGTH_SHORT).show();
return false;
}
if (password.length() < 6)
{
Toast.makeText(getApplicationContext(), "Password too short, enter minimum 6 characters!", Toast.LENGTH_SHORT).show();
return false;
}
return true;
}
}
答案 0 :(得分：0)
以此更新您的onCreate
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String name;
SharedPreferences prefs = this.getSharedPreferences( "prefs", MODE_PRIVATE);
boolean firstStart=prefs.contains("firstStart");
if (!firstStart) {
//show start activity
showRegistration();
}
}
让我知道它有效