Question

I am new to android. And write this program but get error.

public class First1Activity extends Activity {

    /** Called when the activity is first created. */

    public final static String x= "com.example.my.p";
    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);
    }
    public void mess(View view) {
        Intent intent=new Intent(First1Activity.this,DisMess.class);
        EditText edittext = (EditText) findViewById(R.id.editText1);
        String m= edittext.getText().toString();
        intent.putExtra(x, m);
        TextView t=(TextView)findViewById(R.id.textView1);
        t.setText(m);

            First1Activity.this.startActivity(intent);


    }
    public class DisMess extends Activity{

        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            Intent intent = getIntent();
            String message = intent.getStringExtra(First1Activity.x);
            TextView textView = new TextView(this);
            textView.setTextSize(40);
            textView.setText(message);
            setContentView(textView);

        }

    }

Now i get Error like::::::

Application has stop working…

I got error in line :First1Activity.this.startActivity(intent);

pls help

Answer 1

Make sure you have declared DisMess activity in manifest.

I have modified your code slightly.

public class First1Activity extends Activity {

public final static String key= "com.example.my.p";
private Context context;

@Override

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    context=First1Activity.this;

}
public void mess(View view) {

    EditText edittext = (EditText) findViewById(R.id.editText1);
    TextView t=(TextView)findViewById(R.id.textView1); 

    String m= edittext.getText().toString();       
    t.setText(m);   

    Intent intent=new Intent(context,DisMess.class); 
    intent.putExtra(x, m);
    startActivity(intent);
}


  public class DisMess extends Activity{

        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            Intent intent = getIntent();
            String message = intent.getStringExtra(First1Activity.x);
            TextView textView = new TextView(this);
            textView.setTextSize(40);
            textView.setText(message);
            setContentView(textView);

        }

    }