a反向传值

Intent it =newIntent();

it.setClass(MainActivity.this, Main2Activity.class);

startActivityForResult(it,1000);

@Override

protected voidonActivityResult(intrequestCode,intresultCode, Intent data) {

super.onActivityResult(requestCode, resultCode, data);

if(requestCode ==1000&& resultCode ==1001){

TextView tv = (TextView)findViewById(R.id.textView);

Bundle bd = data.getExtras();

tv.setText(bd.getString("username"));

}

}

Intent it =new Intent();

Bundle bd =new Bundle();

bd.putString("username",ed1.getText().toString());

bd.putString("passwoed",ed2.getText().toString());

it.putExtras(bd);

setResult(1001, it);

finish();