获取用户头像的url在刚才步骤拿不到，必须再开一个异步请求向facebook请求用户头像的url，在这个过程中我们还可以指定我们想要的头像的分辨率，保证拿到的头像清晰，这一步需要用到上一步得到的userId，然后异步获得一个json串，解析出我们想要的头像url，并通过接口将获得结果回调给ui界面，代码如下
/**
* 通过facebook的userId,联网异步获取用户的头像url
* @param facebookUserId
*/
public static void getFacebookUserPictureAsync(String facebookUserId, final FacebookUserImageCallback callback) {
JLogUtils.i("AlexFB","准备获取用户头像");
if(callback == null || facebookUserId == null || facebookUserId.length()==0)return;
Bundle parameters = new Bundle();
parameters.putBoolean("redirect", false);
parameters.putString("height", "200");
parameters.putString("type", "normal");
parameters.putString("width", "200");
GraphRequest graphRequest= new GraphRequest(AccessToken.getCurrentAccessToken(), "/" + facebookUserId + "/picture", parameters, HttpMethod.GET, new GraphRequest.Callback() {
public void onCompleted(GraphResponse response) {
if (response == null) {
callback.onFailed("获取用户facebook头像失败");
return;
}
if (response.getError() != null) {
FacebookRequestError facebookRequestError = response.getError();
callback.onFailed("获取用户facebook头像失败2：：" + facebookRequestError.getErrorMessage());
return;
}
JSONObject responseJsonObject = response.getJSONObject();
if (responseJsonObject == null) {
callback.onFailed("获取用户facebook头像失败3");
return;
}
JLogUtils.i("AlexFB", "facebook直接返回的头像信息是" + responseJsonObject.toString());
String avatarUrl = "";
try {
JSONObject dataJsonObject = responseJsonObject.getJSONObject("data");
avatarUrl = dataJsonObject.getString("url");
avatarUrl = URLEncoder.encode(avatarUrl, "UTF-8");
JLogUtils.i("AlexFB", "用户头像获取完毕 avatarUrl:" + avatarUrl);
} catch (Exception e) {
callback.onFailed("获取用户facebook头像失败4"+e.getStackTrace().toString());
}
callback.onCompleted(avatarUrl);
}
}
);
JLogUtils.i("AlexFB","version:"+graphRequest.getVersion()+"");
graphRequest.executeAsync();
}
UI界面调用代码：
AlxFacebookHelper.getFacebookUserPictureAsync(facebookUserId,new AlxFacebookHelper.FacebookUserImageCallback() {
@Override
public void onCompleted(String imageUrl) {
//成功获取到了头像之后
loginRegisterActivity.facebookUser.setAvatar(imageUrl);
//用户的头像和基本信息都获取完毕，现在可以向我们自己的服务器注册facebook用户了
...
}
@Override
public void onFailed(String reason) {
AlxFacebookHelper.signOut();//如果获取失败了，别忘了将整个登录结果回滚
JLogUtils.i("AlexFB",reason);
}
});
好了，基本的登录过程现在就完成了，下面说一下分享的代码：
因为有了SDK，在使用分享功能呢的时候会在自己的APP上面压一个cardView，相对于旧版SDK将一个Activity直接压在自己APP上来说，这样的用户体验更好一点
下面说一下具体的代码实现：
/**
* 通过facebook sdk的默认弹出框进行分享
* @param activity
*/
public static void showFacebookShareDialog(Activity activity,String link,String description,String caption,String imageUrl,ShareFacebookCallback callback) {
if (activity == null) {
if(callback!=null)callback.onFailure("activity 为空");
return;
}
if (!ShareDialog.canShow(ShareLinkContent.class)) {
if(callback!=null)callback.onFailure("现在不能分享");
return;
}
try {
ShareDialog shareDialog = new ShareDialog(activity);
ShareLinkContent.Builder builder = new ShareLinkContent.Builder();
if(!TextUtils.isEmpty(caption)) builder.setContentTitle(caption);
if(!TextUtils.isEmpty(description)) builder.setContentDescription(description);
if(!TextUtils.isEmpty(link))builder.setContentUrl(Uri.parse(link));
if(!TextUtils.isEmpty(imageUrl)) builder.setImageUrl(Uri.parse(imageUrl));
ShareLinkContent linkContent= builder.build();
shareDialog.show(linkContent);
if(callback!=null)callback.onSuccess();
} catch (Exception ex) {
if(callback!=null)callback.onFailure(ex.getStackTrace().toString());
}
}
