完成后不再调用子活动（）

Question

我的场景很简单：我有一个MainActivity，它调用列出所有类别的CategoryActivity。在这个CategoryActivity中，我有一个添加新类别的按钮。当用户单击此按钮时，将调用RegisterCategoryActivity，用户填写字段然后保存。保存之后，我在RegisterCategoryActivity上调用了finish（），但问题是如果我再次尝试添加一个新类别，则不再调用RegisterCategoryActivity但是如果我回到我的MainActivity - ＆gt;单击CategoryActivity然后单击按钮，它可以正常工作。我在这里缺少什么？

CategoryActivity

public class CategoryActivity extends ActionBarActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);     
    setContentView(R.layout.activity_categories);       
}

@Override
public void onResume() {
    new LoadCategories().execute(); // load categories from DB
    super.onResume();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu_activity_category, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.menu_activity_category:
            Intent registerCategoryActivity = new Intent(CategoryActivity.this, RegisterCategoryActivity.class);
            registerCategoryActivity.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
            startActivity(registerCategoryActivity);
        return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

RegisterCategoryActivity

public class RegisterCategoryActivity extends ActionBarActivity {

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_register_category);
}

@Override
public void onResume() {
    super.onResume();           
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu_save, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.menu_save:
            validateFields();
        return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

/** Inner class for implementing progress bar before fetching data **/
private class RegisterCategory extends AsyncTask<Void, Void, Integer> 
{

    @Override
    protected void onPreExecute()
    {
        ...
    }

    @Override
    protected Integer doInBackground(Void... params) 
    {
        int result;
        ...
        return result;
    }

    @Override
    protected void onPostExecute(Integer result)
    {
        ...

        finish();
    }
}

}

的AndroidManifest.xml

<activity
        android:name="com.app.RegisterCategoryActivity"
        android:icon="@drawable/ic_categories"
        android:label="@string/registerCategory"
        android:windowSoftInputMode="stateHidden">
    </activity>

<activity
        android:name="com.app.CategoryActivity"            
        android:icon="@drawable/ic_categories"
        android:label="@string/categories">

        <intent-filter>
            <action android:name="android.intent.action.SEARCH" />
        </intent-filter>  
    </activity>