转自：http://blog.sina.com.cn/s/blog_7309444701014u2d.html
一、不需要返回值的跳转
Intent intent=new Intent();
intent.setClass(目前的acitivy.this, 目标activity.class);
startActivity(intent);
二、需要返回值的跳转
Intent intent=new Intent();
intent.setClass(发出请求的acitivy.this, 目标activity.class);
startActivityForResult(intent, 状态值（int类型）);
状态值作为接收目标返回值的验证。目标activity 关闭才能返回发出请求的activity
例如：
1、请求页面
public class MainActivy extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Intent intent=new Intent();
intent.setClass(MainActivy.this, ReceiveMSG.class);
startActivityForResult(intent, 0);
}
requestCode 接收返回的状态值
resultCode ：RESULT_OK RESULT_CANCELED 可以自己赋值，按返回键时，系统默认赋值为：RESULT_CANCELED
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if (requestCode==0) {
if (resultCode==RESULT_OK) {
Toast.makeText(this, "Send SMS RESULT_OK", Toast.LENGTH_SHORT).show();
}else if (resultCode==RESULT_CANCELED) {
Toast.makeText(this, "result cancel", Toast.LENGTH_SHORT).show();
}else {
Toast.makeText(this, resultCode, Toast.LENGTH_SHORT).show();
}
}else {
Toast.makeText(this, "requsetcode not 0", Toast.LENGTH_SHORT).show();
}
}
}
2、接收返回值界面
public class ReceiveMSG extends Activity{
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
ReceiveMSG.this.setResult(RESULT_OK);
this.finish();
}
}