Android java.lang.NullPointerException: println ne

Question

I have a problem with my app when I try to login.

In fact, if I register (if the checkbox remerberMe isChecked() on register action, at the next connection the main activity is displayed otherwise the login activity appears) first, it works fine.

However, the Login Activity doesn't work when it's called on the next connection after register action.

Login Activity

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login);
        setTitle(R.string.loginTitle);

        // Importing all assets like buttons, text fields
        inputUsername = (EditText) findViewById(R.id.username_value);
        inputPassword = (EditText) findViewById(R.id.password_value);
        btnLogin = (Button) findViewById(R.id.loginButton);
        btnExit = (Button) findViewById(R.id.exitButton);
        btnLinkToRegister = (Button) findViewById(R.id.btnLinkToRegister);
        rememberMe = (CheckBox) findViewById(R.id.rememberNameRegister);

        // Login button Click Event
        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                LoginAction();
            }
        });

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

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

        btnExit.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                finish();

            }
        });
    }

    public void LoginAction() {
        Log.i("Login", "Login Action");
        progressDialog = ProgressDialog.show(LoginActivity.this, null,
                getResources().getString(R.string.loginProgressMessage), true);

        // try {
        runOnUiThread(new Runnable() {
            String username = inputUsername.getText().toString();
            String password = inputPassword.getText().toString();

            @Override
            public void run() {
                Log.i("Login Run", "username " + username);

                switch (username.length()) {
                case 0:
                    blankUserName();

                    break;
                }

                switch (password.length()) {
                case 0:
                    blankPassWord();
                    // thread.stop();
                    break;
                }

                try {
                    if (username.length() > 0 && password.length() > 0) {
                        Log.i("Login Run", "password " + password);
                        // Password pass = new Password(username, password);
                        DatabaseHelper db = new DatabaseHelper(
                                getApplicationContext());
                        int count = db.getRowCount();
                        Log.i("Login", "getRowCompte " + count);
                        if (count == 1) {
                            Log.i("Login","getLogin1 ");
                            // if (db.getLogin(username, password) == 1) {
                            if (db.Login(username, password)== true) {
                                 Log.i("Login", "rememberMe.isChecked()");
                                if (rememberMe.isChecked() == true) {
                                    statut = "on";
                                } else if (rememberMe.isChecked() == false) {
                                    statut = "off";
                                }
                                Log.i("Login", "ok ischecked");
                                Log.i("Login","getRowCompteStat "+ db.getRowCountStat());
                                if (db.getRowCountStat() == 1) {
                                    db.UpdateStatut(statut);
                                    Log.i("Login", "getRowCompte " + count);
                                }
                                Toast.makeText(getApplicationContext(),
                                        "Student Moyenne \n   Bienvenu!",
                                        Toast.LENGTH_LONG).show();
                                Log.i("Login Run", "Connecté");
                                Intent moy = new Intent(
                                        getApplicationContext(),
                                        MoyenneMain.class);
                                // Close all views before launching
                                // Dashboard
                                moy.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                                startActivity(moy);
                                finish();
                                db.close();
                            } else if (db.Login(username, password)==false){
                                // if (db.getLogin(username, password) == 0) {
//                              Log.i("Login Run", "faux password");
                                Toast.makeText(LoginActivity.this,"Invalid Username/Password",Toast.LENGTH_LONG).show();
                                Intent login = new Intent(getApplicationContext(),LoginActivity.class);
                                login.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                                startActivity(login);
                                finish();
                                db.close();
                            }
                        } else if (count == 0) {
                            Log.i("Login Run", "Enregistrez vous");
                            Toast.makeText(LoginActivity.this,
                                    "Enregistrez vous!", Toast.LENGTH_SHORT)
                                    .show();
                            Intent register = new Intent(
                                    getApplicationContext(),
                                    RegisterActivity.class);
                            register.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                            startActivity(register);
                            finish();
                            db.close();
                        }
                    }

                } catch (Exception e) {
                    Log.i("Login Error1", e.getMessage());
                    Toast.makeText(LoginActivity.this, e.getMessage(),
                            Toast.LENGTH_LONG).show();
                }
            }
        });
        // } catch (Exception e) {
        // Thread.currentThread().destroy();
        // Log.i("Login Error2", e.getMessage());
        // Toast.makeText(LoginActivity.this, e.getMessage(),
        // Toast.LENGTH_LONG).show();
        // }

    }

    private void blankUserName() {
        Toast.makeText(LoginActivity.this, "Entrez un nom Utilisateur SVP!",
                Toast.LENGTH_SHORT).show();
        Intent login = new Intent(getApplicationContext(), LoginActivity.class);
        login.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(login);
        finish();
    }

    private void blankPassWord() {
        Toast.makeText(LoginActivity.this, "Entrez un mot de passe SVP!",
                Toast.LENGTH_SHORT).show();
        Intent login = new Intent(getApplicationContext(), LoginActivity.class);
        login.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(login);
        finish();
    }

A part of DatabaseHelper

public int getRowCountStat() {
        String countQuery = "SELECT  * FROM " + TABLE_STATUT;
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(countQuery, null);
        int rowCount = cursor.getCount();
        db.close();
        cursor.close();

        // return row count
        return rowCount;
    }

public int getRowCount() {
        String countQuery = "SELECT  * FROM " + TABLE_LOGIN;
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery(countQuery, null);
        int rowCount = cursor.getCount();
        db.close();
        cursor.close();

        // return row count
        return rowCount;
    }

 public boolean Login(String username, String password) throws SQLException 
        {
            Cursor mCursor = db.rawQuery("SELECT * FROM " + TABLE_LOGIN + " WHERE username=? AND password=?"
                    , new String[]{username,password});
            if (mCursor != null) {           
                if(mCursor.getCount() > 0)
                {
                    return true;
                }
            }
         return false;
        }

public int UpdateStatut(String statut) {
            final static int idStat = 1;
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues cv = new ContentValues();
        cv.put(STATUT, statut);
        return db.update(TABLE_STATUT, cv, ID_STAT + "=?",
                new String[] { String.valueOf(idStat) });
    }

Logcat

10-24 01:48:08.819: E/AndroidRuntime(29242): FATAL EXCEPTION: main
10-24 01:48:08.819: E/AndroidRuntime(29242): java.lang.NullPointerException: println needs a message
10-24 01:48:08.819: E/AndroidRuntime(29242):    at android.util.Log.println_native(Native Method)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at android.util.Log.i(Log.java:143)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at com.android.moyenne.activity.LoginActivity$4.run(LoginActivity.java:163)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at android.app.Activity.runOnUiThread(Activity.java:3707)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at com.android.moyenne.activity.LoginActivity.LoginAction(LoginActivity.java:78)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at com.android.moyenne.activity.LoginActivity$1.onClick(LoginActivity.java:46)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at android.view.View.performClick(View.java:2408)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at android.view.View$PerformClick.run(View.java:8816)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at android.os.Handler.handleCallback(Handler.java:587)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at android.os.Handler.dispatchMessage(Handler.java:92)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at android.os.Looper.loop(Looper.java:123)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at android.app.ActivityThread.main(ActivityThread.java:4627)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at java.lang.reflect.Method.invokeNative(Native Method)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at java.lang.reflect.Method.invoke(Method.java:521)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
10-24 01:48:08.819: E/AndroidRuntime(29242):    at dalvik.system.NativeStart.main(Native Method)
10-24 01:48:12.260: I/Process(29242): Sending signal. PID: 29242 SIG: 9

Answer 1

The image is your imageView and imageurl is your url that is toload image from server.

try {
    InputStream in = new java.net.URL(imageURl).openStream();
    this.image = BitmapFactory.decodeStream(in);             
} catch (Exception e) { 
    String msg = (e.getMessage() == null) ? "image load failed!" :e.getMessage();
    Log.i("image load error", msg);
}

Answer 2

In the catch block e.getMessage() may be null. Try this:

String msg = (e.getMessage()==null)?"Login failed!":e.getMessage();
Log.i("Login Error1",msg);