java - 解析 SignUpCallback() 方法错误

Question

我正在尝试按照 https://www.parse.com/apps/quickstart#social/mobile/android/native/existing 上的快速入门指南进行操作，并添加一个用户，以便我可以测试它并确保一切正常。当我到达这一部分时

    user.signUpInBackground(new SignUpCallback() {
  public void done(ParseException e) {
    if (e == null) {
      // Hooray! Let them use the app now.
    } else {
      // Sign up didn't succeed. Look at the ParseException
      // to figure out what went wrong
    }
  }
}); 

我在新的 SignUpCallBack() 方法上收到错误。它表示我必须在 SignUpCallBack 中声明它抽象或实现抽象方法 did(ParseException)。我不知道如何解决它。我认为必须导入 SignUpCallBack，但它已经这样了，现在我不知道该怎么办。

这是它所在的整个 Activity 类。

 package interested.social.com.interested;
 import android.support.v7.app.ActionBarActivity;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuItem;

 import com.parse.Parse;
 import com.parse.ParseUser;
 import com.parse.SignUpCallback;

 import java.text.ParseException;


 public class MainActivity extends ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Parse.initialize(this, "PjeUs8h1gJqgFgk48ptUUp7QqyyFOXxTYriwjCVu", "0lj44wRi0xHhOmSTtfpAcxyBlZKuzBX23J95wzAL");


    ParseUser newUser = new ParseUser();
    newUser.setUsername(username);
    newUser.setPassword(password);
    newUser.setEmail(email);
    newUser.signUpInBackground(new SignUpCallback() {

        @Override
        public void done(ParseException e) {
            if (e == null) {
                // Hooray! Let them use the app now.
            } else {
                // Sign up didn't succeed. Look at the ParseException
                // to figure out what went wrong
            }
        }
    });


}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

}

Answer 1

您需要在 done 方法上方添加 @Override 装饰器，如下所示，否则它不知道您正在实现正确的方法:

user.signUpInBackground(new SignUpCallback() {
  @Override
  public void done(com.parse.ParseException e) {
    if (e == null) {
      // Hooray! Let them use the app now.
    } else {
      // Sign up didn't succeed. Look at the ParseException
      // to figure out what went wrong
    }
  }
}); 

也尝试使用 com.parse.ParseException e 而不是 ParseException e 作为上面发布的 done() 方法的参数。当然，不要忘记为 setUsername、setPassword 和 setEmail 分配值。