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startActivityForResult与startActivity的不同之处在于：

1、startActivity( )  仅仅是跳转到目标页面，若是想跳回当前页面，则必须再使用一次startActivity( )。 2、startActivityForResult( )  可以一次性完成这项任务，当程序执行到这段代码的时候，假若从T1Activity跳转到下一个Text2Activity，而当这个Text2Activity调用了finish()方法以后，程序会自动跳转回T1Activity，并调用前一个T1Activity中的onActivityResult( )方法。

 

相关函数:

startActivityForResult(Intent intent, Int requestCode) setResut(int resultCode, Intent intent) onActivityResult(int requestCode, int resultCode, Intent intent)

-----------MainActivity----------------------------------------------

public class MainActivity extends Activity {

TextView t; public static final int REQUSET = 110;  //一定要>=0 @Override protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.activity_main);   t = (TextView)findViewById(R.id.toOther);   Button b = (Button)findViewById(R.id.toOther_btn);   b.setOnClickListener(new OnClickListener() {     @Override     public void onClick(View v) { Intent in = new Intent(); in.setClass(getApplicationContext(), OtherActivity.class); startActivityForResult(in, REQUSET);     }  }); } /**--requestCode:请求码 resultCode:结果码，用于标识返回数据来自哪个新Activity */ @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {   super.onActivityResult(requestCode, resultCode, data);   if(requestCode == REQUSET && resultCode == OtherActivity.RESULT_OK){   String str = "帐号："+data.getStringExtra(OtherActivity.KEY_USER_ID)+"\n密码:"   +data.getStringExtra(OtherActivity.KEY_USER_PASSWORD);   t.setText(str); } Toast.makeText(getApplicationContext(), "requestCode=" + requestCode + "::::" + "resultCode=" + resultCode, Toast.LENGTH_LONG).show(); } }

------------------OtherActivity--------------------------------------------------------------------

public class OtherActivity extends Activity {

EditText eID ; EditText ePASSWORD ; Button b; public static final String KEY_USER_ID = "USER_ID"; public static final String KEY_USER_PASSWORD = "USER_PASSWORD";

public static final int RESULT_OK = 111;

@Override protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.activity_other);   eID = (EditText)findViewById(R.id.user_ID);   ePASSWORD = (EditText)findViewById(R.id.user_PASSWORD);   b = (Button)findViewById(R.id.toMain_btn);   b.setOnClickListener(new OnClickListener() {   @Override   public void onClick(View v) {     Intent in = new Intent();     in.putExtra(KEY_USER_ID, eID.getText().toString());     in.putExtra(KEY_USER_PASSWORD, ePASSWORD.getText().toString());     setResult(RESULT_OK,in);     finish();      } });      } }