OnActivityResult() 和 OnNewResult() 有什么区别？

Question

Please look at this photo

我想让应用程序看起来像那张照片..

当我点击 sub-activities 上的 MainActivity 按钮时， OnActivityResult() 和 OnNewIntent() 都在 MainActicity 中调用。

我打算调用 OnActivityResult() 从 MenuActivity 返回，并调用 OnNewIntent() 从 subs 返回。

我了解到妈妈activity通过StartActivityForResult()调用childactivity， child 为 return 调用 setResult()。而当我要调用的 objective activity 还活着的时候，我了解到需要 onNewContent() 因为 objective activity 不调用 onCrete()。

但我想我错了。请让我知道 OnActivityResult() 和 OnNewResult() 有什么区别？而且我还想知道为什么即使在 setResult() 中没有调用 setResult 也会调用 OnActivityResult。

提前致谢。

MainActivity.java

public class MainActivity extends AppCompatActivity {

EditText editText;
EditText editText2;

public static final int REQUEST_CODE_MENU = 100;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    editText = (EditText) findViewById(R.id.editText);
    editText2 = (EditText) findViewById(R.id.editText2);

    Button button = (Button) findViewById(R.id.button);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(editText.getText().toString().length() != 0 &&
                    editText2.getText().toString().length() != 0){
                Intent intent = new Intent(getApplicationContext(), MenuActivity.class);
                startActivityForResult(intent, REQUEST_CODE_MENU);
            } else {
                Toast.makeText(getApplicationContext(),"ID와 비밀번호를 입력해주세요.", Toast.LENGTH_LONG).show();
            }
        }
    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);



    if (requestCode == REQUEST_CODE_MENU) {
        if (resultCode == RESULT_OK) {
            Toast.makeText(getApplicationContext(), "MenuActivity에서 온 Intent입니다.", Toast.LENGTH_LONG).show();
        } else {
            Toast.makeText(getApplicationContext(), "ERROR :  The value of resultCode is not RESULT_OK", Toast.LENGTH_LONG).show();
        }
    } else if {
        Toast.makeText(getApplicationContext(), "ERROR :  The value of requestCode is not REQUEST_CODE_MENU (100)", Toast.LENGTH_LONG).show();
    }
}

@Override
protected void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    Toast.makeText(getApplicationContext(), intent.getStringExtra("from") + "에서 온 Intent입니다.", Toast.LENGTH_LONG).show();
  }
}

MenuActivity.java

public class MenuActivity extends AppCompatActivity {

public static final int REQUEST_CODE_CUSTOM = 200;
public static final int REQUEST_CODE_REVENUE = 300;
public static final int REQUEST_CODE_PRODUCT = 400;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_menu);

    Button custom = (Button) findViewById(R.id.custom);
    custom.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent_cus = new Intent(getApplicationContext(), CustomActivity.class);
            startActivityForResult(intent_cus, REQUEST_CODE_CUSTOM);
        }
    });

    Button revenue = (Button) findViewById(R.id.revenue);
    revenue.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent_rev = new Intent(getApplicationContext(), RevenueActivity.class);
            startActivityForResult(intent_rev, REQUEST_CODE_REVENUE);
        }
    });

    Button product = (Button) findViewById(R.id.product);
    product.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent_pro = new Intent(getApplicationContext(), ProductActivity.class);
            startActivityForResult(intent_pro, REQUEST_CODE_PRODUCT);
        }
    });

    Button tologin = (Button) findViewById(R.id.tologin);
    tologin.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent_login = new Intent(getApplicationContext(), MainActivity.class);
            setResult(RESULT_OK, intent_login);
            finish();
        }
    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    switch(requestCode){
        case REQUEST_CODE_CUSTOM :
            Toast.makeText(getApplicationContext(), data.getStringExtra("from") + "에서 온 Intent입니다.", Toast.LENGTH_LONG).show(); break;
        case REQUEST_CODE_PRODUCT :
            Toast.makeText(getApplicationContext(), data.getStringExtra("from") + "에서 온 Intent입니다.", Toast.LENGTH_LONG).show(); break;
        case REQUEST_CODE_REVENUE :
            Toast.makeText(getApplicationContext(), data.getStringExtra("from") + "에서 온 Intent입니다.", Toast.LENGTH_LONG).show(); break;
        default :
            Toast.makeText(getApplicationContext(), "ERROR occured.", Toast.LENGTH_LONG).show();
    }
  }
}

CustomActivity.java （子活动之一，它的代码与其他完全相同sub-activities）

public class CustomActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_custom);

    Button tomenu = (Button) findViewById(R.id.tomenu);
    Button tologin = (Button) findViewById(R.id.tologin);

    tomenu.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent from_cus = new Intent(getApplicationContext(), MenuActivity.class);
            from_cus.putExtra("from", "CustomActivity");
            setResult(RESULT_OK, from_cus);
            finish();
        }
    });

    tologin.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent from_cus = new Intent(getApplicationContext(), MainActivity.class);
            from_cus.putExtra("from", "CustomActivity");
            from_cus.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP|Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(from_cus);
            finish();
        }
    });
  }
}

Answer 1

从文档中，它说：

This is called for activities that set launchMode to "singleTop" in their package, or if a client used the FLAG_ACTIVITY_SINGLE_TOP flag when calling startActivity(Intent). In either case, when the activity is re-launched while at the top of the activity stack instead of a new instance of the activity being started, onNewIntent() will be called on the existing instance with the Intent that was used to re-launch it.

因此，如果您仔细阅读，只要 activity 的同一实例获得新意图，onNewIntent() 总会被触发。在您的情况下，您发送的是 RESULT_OK 意图，因此最终 onNewIntent() 会收到它。

并且每当你从父activity调用startActivityForResult()时，父activity会等待结果，此时父activity会在前台返回，即使我们不将任何结果发送回 activity，也会调用 onActivityResult 并发送 RESULT_CANCELED 响应代码。这就是这条链的设计方式。

Answer 2

简而言之，onNewIntent() 被调用用于任何进入您的 activity 的意图。

OnActivityResult() returns 由 startActivityForResult()

启动的意图的结果

OnActivityResult() 和 OnNewResult() 有什么区别？

What is difference between OnActivityResult() and OnNewResult()?

android

onactivityresult

onnewintent