Question

我不知道为什么登录后，进入主要活动的用户名和密码都没有出现.....我只看到logout按钮......为什么？

我希望你能帮助我！

登录活动：

public class LoginActivity extends Activity {
    private static final String TAG = RegisterActivity.class.getSimpleName();
    private Button btnLogin;
    private Button btnLinkToRegister;
    private EditText inputNumeroTelefonico;
    private EditText inputPassword;
    private ProgressDialog pDialog;
    private SessionManager session;
    private SQLiteHandler db;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        inputNumeroTelefonico = (EditText) findViewById(R.id.numero_telefonico);
        inputPassword = (EditText) findViewById(R.id.password);
        btnLogin = (Button) findViewById(R.id.btnLogin);
        btnLinkToRegister = (Button) findViewById(R.id.btnLinkToRegisterScreen);

        // Progress dialog
        pDialog = new ProgressDialog(this);
        pDialog.setCancelable(false);

        // SQLite database handler
        db = new SQLiteHandler(getApplicationContext());

        // Session manager
        session = new SessionManager(getApplicationContext());

        // Check if user is already logged in or not
        if (session.isLoggedIn()) {
            // User is already logged in. Take him to main activity
            Intent intent = new Intent(LoginActivity.this, MainActivity.class);
            startActivity(intent);
            finish();
        }

        // Login button Click Event
        btnLogin.setOnClickListener(new View.OnClickListener() {

            public void onClick(View view) {
                String numero_telefonico = inputNumeroTelefonico.getText().toString().trim();
                String password = inputPassword.getText().toString().trim();

                // Check for empty data in the form
                if (!numero_telefonico.isEmpty() && !password.isEmpty()) {
                    // login user
                    checkLogin(numero_telefonico, password);
                } else {
                    // Prompt user to enter credentials
                    Toast.makeText(getApplicationContext(),
                            "Please enter the credentials!", Toast.LENGTH_LONG)
                            .show();
                }
            }

        });

        // Link to Register Screen
        btnLinkToRegister.setOnClickListener(new View.OnClickListener() {

            public void onClick(View view) {
                Intent i = new Intent(getApplicationContext(),
                        RegisterActivity.class);
                startActivity(i);
                finish();
            }
        });

    }

    /**
     * function to verify login details in mysql db
     * */
    private void checkLogin(final String numero_telefonico, final String password) {
        // Tag used to cancel the request
        String tag_string_req = "req_login";

        pDialog.setMessage("Logging in ...");
        showDialog();

        StringRequest strReq = new StringRequest(Method.POST,
                AppConfig.URL_LOGIN, new Response.Listener<String>() {

            @Override
            public void onResponse(String response) {
                Log.d(TAG, "Login Response: " + response.toString());
                hideDialog();

                try {
                    JSONObject jObj = new JSONObject(response);
                    boolean error = jObj.getBoolean("error");

                    // Check for error node in json
                    if (!error) {
                        // user successfully logged in
                        // Create login session
                        session.setLogin(true);

                        // Now store the user in SQLite
                        String uid = jObj.getString("uid");

                        JSONObject user = jObj.getJSONObject("user");
                        String name = user.getString("name");
                        String cognome = user.getString("cognome");

                        String numero_telefonico = user.getString("numero_telefonico");
                        String created_at = user
                                .getString("created_at");

                        // Inserting row in users table
                        db.addUser(name,cognome, numero_telefonico, uid, created_at);

                        // Launch main activity
                        Intent intent = new Intent(LoginActivity.this,
                                MainActivity.class);
                        startActivity(intent);
                        finish();
                    } else {
                        // Error in login. Get the error message
                        String errorMsg = jObj.getString("error_msg");
                        Toast.makeText(getApplicationContext(),
                                errorMsg, Toast.LENGTH_LONG).show();
                    }
                } catch (JSONException e) {
                    // JSON error
                    e.printStackTrace();
                    Toast.makeText(getApplicationContext(), "Json error: " + e.getMessage(), Toast.LENGTH_LONG).show();
                }

            }
        }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e(TAG, "Login Error: " + error.getMessage());
                Toast.makeText(getApplicationContext(),
                        error.getMessage(), Toast.LENGTH_LONG).show();
                hideDialog();
            }
        }) {

            @Override
            protected Map<String, String> getParams() {
                // Posting parameters to login url
                Map<String, String> params = new HashMap<String, String>();
                params.put("numero_telefonico", numero_telefonico);
                params.put("password", password);

                return params;
            }

        };

        // Adding request to request queue
        AppController.getInstance().addToRequestQueue(strReq, tag_string_req);
    }

    private void showDialog() {
        if (!pDialog.isShowing())
            pDialog.show();
    }

    private void hideDialog() {
        if (pDialog.isShowing())
            pDialog.dismiss();
    }
}

主要活动：

public class MainActivity extends Activity {

    private TextView txtName;
    private TextView txtNumeroTelefonico;
    private Button btnLogout;

    private SQLiteHandler db;
    private SessionManager session;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        txtName = (TextView) findViewById(R.id.name);
        txtNumeroTelefonico = (TextView) findViewById(R.id.numero_telefonico);
        btnLogout = (Button) findViewById(R.id.btnLogout);

        // SqLite database handler
        db = new SQLiteHandler(getApplicationContext());

        // session manager
        session = new SessionManager(getApplicationContext());

        if (!session.isLoggedIn()) {
            logoutUser();
        }

        // Fetching user details from SQLite
        HashMap<String, String> user = db.getUserDetails();

        String name = user.get("name");
        String numero_telefonico = user.get("numero_telefonico");

        // Displaying the user details on the screen
        System.out.println(name+""+numero_telefonico);

        txtName.setText(name);
        txtNumeroTelefonico.setText(numero_telefonico);

        // Logout button click event
        btnLogout.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                logoutUser();
            }
        });
    }

    /**
     * Logging out the user. Will set isLoggedIn flag to false in shared
     * preferences Clears the user data from sqlite users table
     * */
    private void logoutUser() {
        session.setLogin(false);

        db.deleteUsers();

        // Launching the login activity
        Intent intent = new Intent(MainActivity.this, LoginActivity.class);
        startActivity(intent);
        finish();
    }
}

登录ACTIVITY.XML：

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="10dp"
    android:fitsSystemWindows="true">

    <LinearLayout
        android:layout_gravity="center_vertical"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:paddingTop="56dp"
        android:paddingLeft="24dp"
        android:paddingRight="24dp" >
        <ImageView
            android:background="@drawable/signor_pomidor"
            android:layout_gravity="center_horizontal"
            android:layout_width="150dp"
            android:layout_height="150dp" />
        <EditText
            android:id="@+id/numero_telefonico"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:background="@color/btn_login_bg"
            android:hint="@string/hint_numero_telefonico"
            android:inputType="textEmailAddress"
            android:padding="10dp"
            android:singleLine="true"
            android:textColor="@color/input_login"
            android:textColorHint="@color/input_login_hint" />

        <EditText
            android:id="@+id/password"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:background="@color/btn_login_bg"
            android:hint="@string/hint_password"
            android:inputType="textPassword"
            android:padding="10dp"
            android:singleLine="true"
            android:textColor="@color/input_login"
            android:textColorHint="@color/input_login_hint" />

        <!-- Login Button -->

        <Button
            android:id="@+id/btnLogin"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dip"
            android:background="@color/btn_login_bg"
            android:text="@string/btn_login"
            android:textColor="@color/btn_logut_bg" />

        <!-- Link to Login Screen -->

        <Button
            android:id="@+id/btnLinkToRegisterScreen"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="40dp"
            android:background="@null"
            android:text="@string/btn_link_to_register"
            android:textAllCaps="false"
            android:textColor="@color/btn_logut_bg"
            android:textSize="15dp" />

    </LinearLayout>

</ScrollView>

主要活动.XML：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="${relativePackage}.${activityClass}" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:gravity="center"
        android:orientation="vertical" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/welcome"
            android:textSize="20dp" />

        <TextView
            android:id="@+id/name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="10dp"
            android:textColor="@color/lbl_name"
            android:textSize="24dp" />

        <TextView
            android:id="@+id/numero_telefonico"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="13dp" />

        <Button
            android:id="@+id/btnLogout"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="40dip"
            android:background="@color/btn_logut_bg"
            android:text="@string/btn_logout"
            android:textAllCaps="false"
            android:textColor="@color/white"
            android:textSize="15dp" />
    </LinearLayout>

</RelativeLayout>

GET USER DETAIL:

if（isset（$ _ POST [＆＃39; numero_telefonico＆＃39;]）＆amp;＆amp; isset（$ _ POST [＆＃39;密码＆＃39;]））{

    // receiving the post params
    $numero_telefonico = $_POST['numero_telefonico'];
    $password = $_POST['password'];

    // get the user by email and password
        $user = $db->getUserByEmailAndPassword($numero_telefonico, $password);

        if ($user != false) {
            // use is found
            $response["error"] = FALSE;
            $response["uid"] = $user["unique_id"];
            $response["user"]["name"] = $user["name"];
            $response["user"]["cognome"] = $user["cognome"];
            $response["user"]["numero_telefonico"] = $user["numero_telefonico"];
            $response["user"]["created_at"] = $user["created_at"];
            $response["user"]["updated_at"] = $user["updated_at"];
            echo json_encode($response);
        }




 public function getUserByEmailAndPassword($numero_telefonico, $password) {

        $stmt = $this->conn->prepare("SELECT * FROM users WHERE numero_telefonico = ?");

        $stmt->bind_param("s", $numero_telefonico);

        if ($stmt->execute()) {
            $user = $stmt->get_result()->fetch_assoc();
            $stmt->close();

            // verifying user password
            $salt = $user['salt'];
            $encrypted_password = $user['encrypted_password'];
            //$hash = $this->checkhashSSHA($salt, $password);
                        $hash = $password;

            // check for password equality
            if ($encrypted_password == $hash) {
                // user authentication details are correct
                return $user;
            }
        } else {
            return NULL;
        }
    }

enter image description here

Answer 1

主要ACTIVITY.XML中的问题只需按照以下代码即可。我改变了重量和一些颜色，但你可以根据你的要求改变它。在主要的相对布局中，我将背景视为白色。

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"
    android:gravity="center"
    android:orientation="vertical" 
    android:weightSum="4">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/welcome"
        android:textSize="20dp" 
        android:textColor="@color/black"
        android:layout_weight="1"/>

    <TextView
        android:id="@+id/name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:textColor="@color/black"
        android:textSize="24dp"
        android:text="@string/welcome" />

    <TextView
        android:id="@+id/numero_telefonico"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="13dp" 
        android:layout_weight="1"
        android:textColor="@color/black"
        android:text="@string/welcome"/>

    <Button
        android:id="@+id/btnLogout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dip"
        android:background="@color/btn_logut_bg"
        android:text="@string/btn_logout"
        android:textAllCaps="false"
        android:textColor="@color/black"
        android:textSize="15dp"
        android:layout_weight="1" />
</LinearLayout>

希望这会对你有所帮助。

登录后，名称和密码不会显示在主要活动中

1 个答案: