Android：展示其他活动的活动视图

Question

嗨，我有两个活动，第一个活动有三个图标，一个是隐形的......当我点击第一个活动时，它使用intent ..第二个活动活动是一个登录屏幕，当登录成功时，我应该回到第一个活动并在第一个活动中显示一个图标..如何从第二个活动返回到第一个活动并使该图标在第一个活动中可见..下面是我的登陆界面代码

public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 

      setContentView(R.layout.fyelogin);      
      etPassword = (EditText)findViewById(R.id.password); 
      btnLogin = (Button)findViewById(R.id.login_button); 
      btnCancel = (Button)findViewById(R.id.cancel_button); 
      lblResult = (TextView)findViewById(R.id.result); 

      final ImageView details = (ImageView)findViewById(R.id.red); 

      btnLogin.setOnClickListener(new OnClickListener() { 
       public void onClick(View v) { 

        String password = etPassword.getText().toString(); 

        if(password.equals("guest")){ 
         lblResult.setText("password successful."); 

       // details.setVisibility(View.VISIBLE); 


        } else { 
         lblResult.setText("password doesn't match."); 

        }          
        finish();}}); 

任何建议/帮助表示赞赏...

Answer 1

使用startActivityforResult打开登录活动..然后在你的第一个活动onActivityResult(int, int, Intent)显示图标..

例子：

public class MyActivity extends Activity { 
... 

static final int PICK_CONTACT_REQUEST = 0; 

protected boolean onKeyDown(int keyCode, KeyEvent event) { 
    if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) { 
     // When the user center presses, let them pick a contact. 
     startActivityForResult(
      new Intent(Intent.ACTION_PICK, 
      new Uri("content://contacts")), 
      PICK_CONTACT_REQUEST); 
     return true; 
    } 
    return false; 
} 

protected void onActivityResult(int requestCode, int resultCode, 
     Intent data) { 
    if (requestCode == PICK_CONTACT_REQUEST) { 
     if (resultCode == RESULT_OK) { 
      // A contact was picked. Here we will just display it 
      // to the user. 
      startActivity(new Intent(Intent.ACTION_VIEW, data)); 
     } 
    } 
} 
} 

检查http://developer.android.com/reference/android/app/Activity.html