android - 我无法理解如何实现 "Result Callback"。有人能指出我正确的方向吗？

Question

我正在关注 this guide on google用于设置适用于 Android 的 Google Play 游戏服务。

在实现 ResultCallback 的部分，它说:

In the snippet, MatchInitiatedCallback is a class that implements the ResultCallback interface. You can attach this object to the GoogleApiClient so that your game is notified whenever a match is initiated. To see how the MatchInitiatedCallback is implemented, see Taking the first turn.

public class MatchInitiatedCallback implements
    ResultCallback<TurnBasedMultiplayer.InitiateMatchResult> {

@Override
public void onResult(TurnBasedMultiplayer.InitiateMatchResult result) {
    // Check if the status code is not success.
    Status status = result.getStatus();
    if (status.isSuccess()) {
        showError(status.getStatusCode());
        return;
    }

    TurnBasedMatch match = result.getMatch();

    // If this player is not the first player in this match, continue.
    if (match.getData() != null) {
        showTurnUI(match);
        return;
    }

    // Otherwise, this is the first player. Initialize the game state.
    initGame(match);

    // Let the player take the first turn
    showTurnUI(match);
 }
}

我创建了一个名为“MatchInitiatedCallback”的类，但我不知道如何处理它。我想开始一个新的 Intent 。

    // Let the player take the first turn
    showTurnUI(match);

我尝试在 showTurnUI() 中启动一个新的 Intent ，但是我猜这个 MatchInitiatedCallback 不会让我启动一个新的 Intent ，因为它没有继承自 Activity...(?)

我不太了解这些回调的事情，不知道从哪里开始，谁能给我指明正确的方向？

Answer 1

查看 GitHub 中的回合制示例:https://github.com/playgameservices/android-basic-samples/blob/master/BasicSamples/SkeletonTbmp/src/main/java/com/google/example/tbmpskeleton

回调是使用调用主 Activity 方法的匿名类实现的。

    ResultCallback<TurnBasedMultiplayer.InitiateMatchResult> cb = new ResultCallback<TurnBasedMultiplayer.InitiateMatchResult>() {
        @Override
        public void onResult(TurnBasedMultiplayer.InitiateMatchResult result) {
            processResult(result);
        }
    };
    Games.TurnBasedMultiplayer.createMatch(mGoogleApiClient, tbmc).setResultCallback(cb);

processResult 的代码可以在示例的上下文中看到:https://github.com/playgameservices/android-basic-samples/blob/master/BasicSamples/SkeletonTbmp/src/main/java/com/google/example/tbmpskeleton/SkeletonActivity.java#L638