CODEWITHSUNDEEP
javaandroidandroid-intent
user5540107
user5540107

Reputation:

String can't display in second activity

I was trying to display user input and password in second activity but I got an error unfortunatly login has stopped... I am getting an error java.lang.nullpointerException : attempt to invoke virtual method'void android.widget.TextView.setText(java.lang.ChaeSequence)' on a null object reference.

Main class.

public class MainActivity extends Activity implements View.OnClickListener
{

    EditText userName;
    EditText password;
    Button loginButton;

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

        userName = (EditText) findViewById(R.id.editText);
        password = (EditText) findViewById(R.id.editText2);
        loginButton = (Button) findViewById(R.id.button);
        loginButton.setOnClickListener(this);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings)
        {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    public void onClick(View view)
    {
            String userStr = userName.getText().toString();
            String passStr = password.getText().toString();
            Intent intent = new Intent(MainActivity.this, SecondAcivity.class);
            intent.putExtra("userName", userStr);
            intent.putExtra("password", passStr);
            startActivity(intent);
    }

Second Class.

public class SecondAcivity extends MainActivity
{
 @Override
    protected void onCreate(Bundle savedInstanceState)
    {

            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_second_acivity);

             TextView  textView = (TextView) findViewById(R.id.textView);
             Intent intent = getIntent();
             String  userName = intent.getStringExtra("userName");
             String password = intent.getStringExtra("password");
             textView.setText("User Name: " + userName + " Password: " + password);


            FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
            fab.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                            .setAction("Action", null).show();
                }
            });


    }

Upvotes: 1

Views: 264

Answers (6)

Tony Augustine
Tony Augustine

Reputation: 180

Bundle extras = getIntent().getExtras(); 
String userName,password;


if (getIntent().hasExtra("userName")) {
    userName = extras.getString("userName");
    password = extras.getString("password");  
        }

Upvotes: 0

Mohit Suthar
Mohit Suthar

Reputation: 9395

You can use this to get string from activity

String userName,password;
userName = getIntent().getExtras().getString("userName");
password = getIntent().getExtras().getString("passowrd");

Upvotes: 0

Viral Patel
Viral Patel

Reputation: 33438

You dont pull the strings from the instance of Intent itself. You need to fetch the Bundle of extras from the Intent and then get strings from the Bundle:

Use this:

Intent intent = getIntent();
Bundle extras = intent.getExtras();

String userName = "";
String password = "";

if (extras != null) {
    userName = extras.getString("userName");
    password = extras.getString("password");
}

Upvotes: 2

Rohan Pawar
Rohan Pawar

Reputation: 2003

Your attempting to set text to null TextView

check if second activity layout file activity_second_acivity contains textView

Upvotes: 0

ville101
ville101

Reputation: 246

kindly check in your R.layout.activity_second_acivity if the id textView exists. The texview variable will become null if the R.id.textView does not exist in your R.layout.activity_second_acivity.

Upvotes: 0

Ronish
Ronish

Reputation: 404

This will handle the NullPointerException when empty values are passed

Try :

Bundle extras = getIntent().getExtras(); 
String userName,password;

if (extras != null) {
    userName = extras.getString("userName");
    password = extras.getString("password");
}

Upvotes: 1

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