意图：开始一个活动，无法开始第二个活动

Question

The application aims to write a message at the first activity, and after clicking on a button, this message appears in the second activity. But After installing the application on smartphone, when i click on the button, a message appears saying " application is stopped". Help me please." i USED ECLIPSE for developping this application"

The first activity code:

public class MainActivity extends Activity {

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

    public void login (View view) {


        EditText user = (EditText) findViewById(R.id.user);
        EditText password = (EditText) findViewById(R.id.password);
        Intent myintent= new Intent (getApplicationContext(),Main2Activity.class);  //permet de basculer de cette interface à la 2éme aprés avoir éxécuter "startActivity(myintent)";

        Bundle b=new Bundle();
        b.putString("username", user.getText().toString());
        b.putString("password", password.getText().toString());
        myintent.putExtras(b);
        startActivity(myintent);
}

The second activity:

public class Main2Activity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        TextView mes=(TextView)findViewById(R.id.mes);

        Bundle b=getIntent().getExtras();
        string user=(string) b.get("username");
        string pass=(string) b.get("password");
        mes.setText("user:"+user  +"password:"+pass);

}

Answer 1

Try a simpler way to pass data as a String,without using bundle.

MainActivity.java

Intent i= new Intent(MainActivity.this,Main2Activity .class);
i.putExtra("username",user.getText().toString());
i.putExtra("password",password.getText().toString());
startActivity(i);

and in Main2Activity .java

String name=getIntent().getExtras().getString("username");
txtView.setText(name);
String pass=getIntent().getExtras().getString("password");
txtView2.setText(pass);

Answer 2

Change this line

Intent myintent= new Intent (getApplicationContext(), Main2Activity.class)

to

Intent myintent= new Intent (this, Main2Activity.class)

And see if it solves the problem :)

Answer 3

On Your Second Activity(Main2Activity) File:

The Line After Bundle b=getIntent().getExtras();

you have written (string) instead of (String) . So please change it...if u have written it mistakenly.

and @AugustoCarmo answer is also correct.

Try That Also.