安卓CallBack的实现

1.声明一个interface

public interface ICallback<RESULT> {

    void onCallback(RESULT data);

    void onError(Throwable error);

}

2.当进行异步操作时 比如网络去请求的结果

public void updateCurrentUserInfo(final DBCurrentUser currentUser, final ICallback<DBCurrentUser> callback) {
    ApiEndpointClient.getEndpointV2().getCurrentUser("Bearer " + SharedPrefUtils.getInstance().getString(AppConstant.SharedPreferenceKey.CURRENT_TOKEN))
            .enqueue(new Callback<HttpResponse<CurrentUserInfo>>() {
                @Override
                public void onResponse(Call<HttpResponse<CurrentUserInfo>> call, Response<HttpResponse<CurrentUserInfo>> response) {
                    if (currentUser != null && HttpRequestUtil.hasValidBody(response) && response.body().getData().getAttributes() != null) {
                        MonkeyLog.D("CurrentUserHelper  updateCurrentUserinfo() success updateUserinfo = " + response.body().getData());
                        CurrentUserInfo currentUserInfo = response.body().getData();
                        if (currentUserInfo != null) {
                            currentUserInfo.updateCurrentUserInfo(currentUser);
                            if (callback != null) {
                                callback.onCallback(currentUser);
                            }
                        }
                    } else {
                        onFailure(call, new NullPointerException("Null user info returned"));
                    }
                }

                @Override
                public void onFailure(Call<HttpResponse<CurrentUserInfo>> call, Throwable t) {
                    MonkeyLog.D("CurrentUserHelper  updateCurrentUserinfo() onFailure() 111  t = " + t);
                    if (t != null) {
                        t.printStackTrace();
                    }
                    if (callback != null) {
                        callback.onError(t);
                    }
                }
            });
}

3.外围去调取的时候：

CurrentUserHelper.getInstance().updateCurrentUserInfo(dbCurrentUser, new ICallback<DBCurrentUser>() {
    @Override
    public void onCallback(DBCurrentUser currentUserInfo) {
        dispatchActivity();
    }

    @Override
    public void onError(Throwable error) {
        dispatchActivity();
    }
});