如何从splash到主页进行共享首选项

Question

我想让我的应用程序在开始页面上看起来像facebook，如果用户登录登录页面不再显示它直接从启动页面到主页。我的应用程序发生的事情是，从初始化开始，登录页面仍然显示，但是使用共享首选项，它会立即加载以登录存储在共享中的详细信息。我想要发生的是登录页面不再显示。这是我的代码，以便更好地理解。 ：）

闪

public class Splash extends AppCompatActivity {
SharedPreferences pref;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_splash);
    pref = getSharedPreferences("Login.conf", Context.MODE_PRIVATE);

    Thread myThread = new Thread(){
        @Override
        public void run() {
            try {
                sleep(2000);
                Intent in = new Intent (getApplicationContext(),LoginActivity.class);
                startActivity(in);
                finish();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    };
    myThread.start();
}
}

Loginpage

public class LoginActivity extends AppCompatActivity {

final String TAG = this.getClass().getName();

Button btnLogin;
EditText etUsername, etPassword;
TextView tvRegister;
SharedPreferences pref;
SharedPreferences.Editor editor;
HashMap<String, String> postData = new HashMap<>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    etUsername = (EditText) findViewById(R.id.etFirstname);
    etPassword = (EditText) findViewById(R.id.etPassword);
    btnLogin = (Button) findViewById(R.id.btnLogin);
    tvRegister = (TextView) findViewById(R.id.tvRegister);

    pref = getSharedPreferences("Login.conf", Context.MODE_PRIVATE);
    editor = pref.edit();
    editor.putBoolean("hasLoggedIn", true);
    editor.commit();

    boolean hasLoggedIn = pref.getBoolean("hasLoggedIn", false);

    if(hasLoggedIn){
        String username = pref.getString("username", "");
        String password = pref.getString("password", "");

        if (!username.equals("") && (!password.equals(""))) {
            postData.put("username", username);
            postData.put("password", password);
            authenticate(postData);
        }

        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (TextUtils.isEmpty(etUsername.getText().toString())) {
                    Toast.makeText(LoginActivity.this, "Username is empty", Toast.LENGTH_SHORT).show();
                    return;
                }
                if (TextUtils.isEmpty(etPassword.getText().toString())) {
                    Toast.makeText(LoginActivity.this, "Password is empty", Toast.LENGTH_SHORT).show();
                    return;
                }
                editor = pref.edit();
                postData.put("username", etUsername.getText().toString());
                postData.put("password", MD5.encrypt(etPassword.getText().toString()));
                editor.commit();
                authenticate(postData);
            }
        });
    }


    tvRegister.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent in = new Intent(LoginActivity.this, RegisterActivity.class);
            startActivity(in);
        }
    });


}

private void authenticate(final HashMap<String, String> postData) {
    PostResponseAsyncTask task1 = new PostResponseAsyncTask(LoginActivity.this, postData,
            new AsyncResponse() {
                @Override
                public void processFinish(String s) {
                    Log.d(TAG, s);
                    if (s.contains("renter")) {
                        // Login success, Save to prefs
                        editor = pref.edit();
                        editor.clear();
                        editor.putString("username", postData.get("username"));
                        editor.putString("password", postData.get("password"));
                        editor.putString("userlevel", s);
                        editor.commit();

                        Toast.makeText(LoginActivity.this, "Renter Login Successful!", Toast.LENGTH_SHORT).show();
                        Intent in = new Intent(LoginActivity.this, RenterTabs.class);
                        startActivity(in);
                        finish();

                    } else if (s.contains("owner")) {
                        // Login success, Save to prefs
                        editor = pref.edit();
                        editor.clear();
                        editor.putString("username", postData.get("username"));
                        editor.putString("password", postData.get("password"));
                        editor.putString("userlevel", s);
                        editor.commit();

                        Toast.makeText(LoginActivity.this, "Owner Login Successful!", Toast.LENGTH_SHORT).show();
                        Intent in = new Intent(LoginActivity.this, OwnerTabs.class);
                        startActivity(in);
                        finish();
                    } else if (s.contains("driver")) {
                        editor = pref.edit();
                        editor.clear();
                        editor.putString("username", postData.get("username"));
                        editor.putString("password", postData.get("password"));
                        editor.putString("userlevel", s);
                        editor.commit();

                        Toast.makeText(LoginActivity.this, "Driver Login Successful!", Toast.LENGTH_SHORT).show();
                        Intent in = new Intent(LoginActivity.this, DriverTabs.class);
                        startActivity(in);
                        finish();
                    } else if (s.contains("-1")) {
                        Toast.makeText(LoginActivity.this, "Wrong username or password...", Toast.LENGTH_SHORT).show();
                    }
                }
            });
    task1.execute("http://carkila.esy.es/carkila/authenticate.php");
}
}

顺便说一句，我正在使用userlevel登录。 Thaanks：）

Answer 1

试试这种方式

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    pref = getSharedPreferences("Login.conf", Context.MODE_PRIVATE);
    editor = pref.edit();
    editor.putBoolean("hasLoggedIn", true);
    editor.commit();

    boolean hasLoggedIn = pref.getBoolean("hasLoggedIn", false);

    if(hasLoggedIn){
        // that means no need to show your login page. so go to main activity
        Intent in = new Intent (getApplicationContext(),MainActivity.class);
        startActivity(in);

    }else{
         setContentView(R.layout.activity_main);

          .................

          // others code goes here for login activity..
    }

}

您可以在启动画面中应用相同的登录...内部线程..

// check user login status from sharedpreference
if(loggedIn){
   // go to main activity
}else{
   // go to login activity
}